WO1994004710A1

WO1994004710A1 - Method and apparatus for producing sintered ore

Info

Publication number: WO1994004710A1
Application number: PCT/JP1993/001164
Authority: WO
Inventors: Tadahiro Inazumi; Masami Fujimoto; Yoshio Okuno; Shuichi Sato; Masaaki Nakayama; Yuichi Terada; Kenro Nozaki; Shinichi Matsunaga; Tsutomu NAKAYASU
Original assignee: Nippon Steel Corporation
Priority date: 1992-08-20
Filing date: 1993-08-19
Publication date: 1994-03-03
Also published as: EP0608436A4; EP0608436A1; CN1086266A; BR9305616A; AU4761993A; AU668756B2

Abstract

In production of sintered ore using an air suction type sintering process, a method and an apparatus for producing sintered ore by allowing sintering to progress under a state in which a magnetic levitation force is applied characterized in that the surface of a raw material layer is ignited, that after sintering has started at the upper layer portion of the raw material layer, a magnetic field is applied to the raw material by means of a magnetic levitation device that is not in contact with a sintered cake in which burning is completed so that a magnetic levitation force is applied thereto, and that while the magnetic levitation force is being applied, a magnetic levitation force acting in a widthwise direction which is normal to a sintered strand is distributed so that uniform sintering is achieved through uniform ventilation distribution. The method and apparatus are further characterized in that uniform sintering is achieved through continuous application of magnetic levitation force by means of a magnetic levitation device which can be moved while in contact with the sintered cake. The method and apparatus are still further characterized in that uniform sintering is achieved by applying magnetic levitation force mainly to portions of the sintered layer where ventilation is poor by means of a plurality of non-contact and movable magnetic levitation devices.

Description

Description Sinter production method and production equipment Technical field

The present invention relates to a method and an apparatus for producing iron ore sintered ore and non-ferrous metal sintered ore by an air suction type sintering machine such as a D L (Dwight-Lloyd) type or a GW (Greenawalt) type. Background art

For example, in the DL iron ore sintering method, after igniting the coke fines contained in the raw material on the surface layer, the sintering of the coke fines is continued by the air sucked downward, thereby increasing the height above the pallet. The sintering reaction proceeds in such a manner that the combustion zone having a thickness of several mm to several tens of mm moves downward in the direction of the length. In the case of the nonferrous metal sintering method, the heat of oxidation of the sulfur component in the ore is used without using coke breeze, or it is operated by pressing air, but it passes through the sintering bed. There is no change in the basics of the process of oxidizing sulfur as fuel contained in the generated air and generating heat, and sintering with the heat.

In such self-combustion type sintering, it is necessary to secure the minimum necessary air holes. However, in the process in which air is sucked or pressed downward and the combustion zone moves downward, the upper layer is heated by the air preheated in the upper sintering completed zone in the lower layer of the sintering layer. Insufficient heat tends to be sintered in the lower layer due to excessive heat.

In accordance with such a thermal gradient existing in the height direction of the sintered layer, the lower the lower layer, the larger the amount of melt that becomes a factor for closing pores. Soshi Since the upper layer of the thin cake serves as a push lid to apply a load to the lower layer, the force of crushing the pores acts in the presence of the melt, and the lower the layer, the stronger the tendency to close the pores.

Therefore, in general, the lower the layer, the higher the density, and it becomes difficult to secure the ventilation conditions necessary for stable combustion of the coke. As a result, the burning rate of the coke is reduced and the sintering rate is reduced, thus reducing the productivity of sinter production. In addition, burn unevenness

(Nonuniform firing) reduces the yield. On the other hand, poor cooling deteriorates the low-temperature reduction pulverizability, and also reduces the porosity to reduce the reducibility.

As measures to improve the sintering for the essential problem of the downward suction sintering process described above, the inventors have previously described Japanese Patent Application Laid-Open No. HEI 4-124,225 and Japanese Patent Application No. HEI-3-1245 In the invention of No. 2, etc., a sintering method in which a magnetic field is applied to the sintered upper layer cake to apply a magnetic levitation force to progress sintering in a lower state in which the load on the lower layer is reduced. Proposed and improved. In each of these, the magnetic levitation device is on the sintering bed, and the levitation force is applied to the thin cake in a non-contact manner.

However, the actual surface of the sintered layer has irregularities on the surface of the thin cake at the position where the magnetic levitation force is to be applied due to disturbances in the charging of the raw materials and ignition mura, etc. It has been clarified that the difference in the magnetic levitation force that occurs because the gap with the device differs depending on the location, and therefore the effect varies somewhat depending on the location.

In addition, when the strength of the thin cake is weak, it may float away, and excessive air flows locally through the cracks in the separated part, and in particular, the size of the sintering machine pallet. Do In the vicinity of the wall, excessive ventilation due to the wall effect at the time of material filling causes problems such as non-uniform sintering, which hinders stable magnetic levitation. It has been found.

Furthermore, in the sintering method described above, the magnetic levitation devices are dispersed and fixed in the direction of the sintering strand, and the sintering raw material conditions and the sintering conditions change, resulting in poor ventilation in the sintered layer. When the zone or the degree of poor ventilation changes, the positions of the magnetic levitation devices cannot be shifted or the distance between the magnetic levitation devices cannot be easily changed, which poses a problem in effective application of the magnetic levitation force. is there. Disclosure of the invention

The present invention solves the problem that such a magnetic levitation force acts unevenly in the sintered layer or partially floats away, thereby hindering the stable development of the magnetic levitation effect. In addition, it is an object of the present invention to provide a method and an apparatus for producing sinter which can always exhibit a magnetic levitation effect stably and further improve the productivity, yield and quality of sinter. I do.

In addition, the present invention can stably exhibit the magnetic floating effect even when the sintering raw material conditions and the sintering conditions fluctuate to change the poor ventilation zone and the degree of poor ventilation in the sintered layer. An object of the present invention is to provide a method and an apparatus for producing sintered ore, which can enhance the permeability of a layer and can significantly improve the productivity of sintered ore production.

In the method for producing a sintered ore according to the present invention, when producing the sintered ore by the air suction sintering method, the surface of the raw material layer is ignited, and the sintering is started in the upper part of the raw material layer, and then the firing is finished A magnetic levitation in the width direction perpendicular to the direction of the sintering strand in a method for producing a sinter that applies sintering while applying a magnetic field to the Shin-Yuichi cake and applying magnetic levitation. Power It is characterized by having a distribution and sintering.

In this sinter production method, whether or not firing in the width direction is uniform is generally determined by extracting the pallet and examining the yield distribution in the width direction in the pallet. . However, since the test load in this study is large, it is possible to take a sinter cake sample while operating the sintering machine and evaluate its structure. According to the result obtained by such a determination method, the distribution of the magnetic levitation force in the width direction by the magnetic levitation means can be adjusted.Therefore, the magnetic levitation means is formed by, for example, a magnetic coil divided in the width direction. However, the current value of each of the magnetic coils can be individually changed to adjust the firing in the width direction to be uniform. During daily operation. In the state where the raw material conditions and operating conditions do not change significantly, look at these sintering operation factors so that the air flow distribution in the width direction and Z or firing loss (burnout loss) are constant. The distribution of the magnetic levitation force is controlled by adjusting the current value of the magnetic coil divided in the width direction so that firing in the width direction is constant. Alternatively, the distribution of the magnetic levitation force may be controlled so that the temperature distribution in the width direction of the exhaust gas under the pallet and / or the descending state of the red tropics in the width direction in the mining part are constant.

Next, in the method for producing a sintered ore according to the present invention, when producing a sintered ore by an air suction type sintering method, a raw material packed bed is ignited and sintering is started, and In the section from the point at which the sinter cake is generated on the surface layer after the sintering to the mining section at the rear of the strand, the sinter cake is disposed in direct contact with the surface layer of the sinter cake, and Using a plurality of intermittently connected magnetic levitation means that move in synchronism with the strand in the direction of the axis, the thin cake on the strand is magnetized, and the levitation force is continuously applied to the sinter cake. And sintering. According to the method for producing a sintered ore, the surface layer of the sintered sinter cake is compared with the method of applying a levitation force by magnetic levitation means disposed on the sintering bed in a non-contact state. In addition, since the magnetic levitation means directly contacts the sinter cake and magnetically adheres to the sinter cake, there is no difference in the gap between the surface and the location.

Further, the sinter ore manufacturing apparatus according to the present invention for implementing the sinter ore manufacturing method includes a sintering machine for manufacturing sinter by an air suction sintering method and a sinter machine intermittently in a strand direction. Magnetically levitating elements, and a mechanism for movably supporting the magnetically levitating elements, and these magnetically levitating elements complete the firing of the surface layer of the material-filled layer, and the The section from the start of the sinter cake production to the mining section behind the strand is in direct contact with the surface of the sinter cake, and magnetizes the sinter cake on the sinter cake. It is characterized in that it moves while applying a levitation force to the wing continuously.

Further, according to the present invention, as a mechanism for movably supporting a plurality of intermittently connected magnetic levitation elements, a seamless chain-like structure for supporting a plurality of intermittently connected magnets on an outer surface is provided. A rotating band of the dress and a mechanism for rotatably supporting the rotating band are provided.

Next, in the method for producing a sintered ore according to the present invention, when producing the sintered ore by the air suction type sintering method, the raw material layer is ignited, and the sintering is started in the upper layer of the raw material. A magnetic field is applied to the upper sinter cake that has completed the sintering, and sintering proceeds with the magnetic levitation force applied. It is characterized by controlling the magnetic levitation force to act on the poorly ventilated area.In this case, the CT image analysis of the cross section of the sinter cake in the height direction identifies the poorly ventilated area, Levitation force can be applied. In this method for producing a sintered ore, a load control by a stand can be combined in place of the magnetic levitation force in order to partially adjust the ventilation in the lower layer.

The sinter ore manufacturing apparatus according to the present invention for implementing the sinter ore manufacturing method includes a sintering machine for manufacturing a sinter by an air suction type sintering method, and a magnetic levitation force applied to a sintered layer. One or more magnetic levitation devices for operating the sintering machine are provided, and the one or more magnetic levitation devices can be moved in the longitudinal direction of the sintering machine. For this purpose, a bogie on which the magnetic levitation device is mounted and which can be moved to any position in the longitudinal direction of the sintering machine, and a dedicated rail for running the bogie are provided.

In addition, a stand can be provided in the lower portion of the sintered layer instead of the magnetic levitation device that applies a magnetic levitation force to the lower portion.

According to the method for producing a sintered ore and the apparatus for producing a sintered ore for carrying out the method, in the sintering operation, the sintering raw material conditions and the sintering conditions fluctuate considerably, and the The magnetic levitation device is moved so that the magnetic levitation force can be applied to such a ventilation network zone, although the degree of the poor ventilation zone and the degree of poor ventilation may change. To determine whether the firing in the length direction of the sintering machine is uneven, take a sample in the height direction of the sinter cake and use the ventilation net data obtained from the CT image of the cross section. be able to.

From the sintering information obtained in this way, the zone of poor ventilation in the height direction of the sintering layer and its degree are detected, and the range of the sintering machine corresponding to that zone in the longitudinal direction and the required magnetic levitation pitch Then, one or more magnetic levitation devices are moved to the target position, and control is performed so that the magnetic levitation force is applied at that position.

If a stand is provided in the lower part of the sintered layer, The magnetic levitation device for applying the magnetic levitation force can be omitted, and the size of the magnetic levitation device can be reduced and power consumption can be reduced. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a conceptual diagram illustrating a sintering operation in which a non-contact type magnetic levitation device is provided in a DL sintering machine.

FIG. 2 is a perspective view conceptually showing the structure of a magnetic levitation device divided into two parts in the width direction.

Fig. 3 is a conceptual diagram illustrating a sintering operation with a contact-type magnetic levitation device consisting of a rotating band that supports a plurality of magnets intermittently connected to a DL-type sintering machine. FIG.

FIG. 4 is an enlarged perspective view showing a detailed structure of an example of the magnetic levitation device in FIG.

FIG. 5 is a perspective view showing a detailed structure of an example of a rotating band that supports a plurality of intermittently connected magnets.

FIG. 6 is a perspective view showing a detailed structure of another example of a rotating belt that supports a plurality of intermittently connected magnets.

Fig. 7 shows an example of a DL type sintering machine equipped with a non-contact type magnetic levitation device whose position can be adjusted in the longitudinal direction and operating with a magnetic load control for air permeability adjustment. It is a conceptual diagram.

FIG. 8 is a perspective view showing a configuration of an example of a magnetic levitation device whose position can be adjusted.

FIG. 9 is a front view of the lower portion of the magnetic levitation device of FIG.

FIG. 10 is a side view of the lower portion of the magnetic levitation device of FIG.

FIG. 11 is a characteristic diagram illustrating various load control conditions.

Fig. 12 shows the sintering results under various load control conditions in Fig. 11.

ある There is. FIG. 13 is an explanatory diagram for explaining a combined mode of a compound magnetic levitation device combining load control by a stand.

FIG. 14 is a characteristic diagram for explaining the sintering effect of the sintering method using the stand composite magnetic levitation apparatus. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of an apparatus for producing a sintered ore according to the present invention, to which the method for producing a sintered ore according to the present invention can be applied, will be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram illustrating a sintering operation in which a non-contact type magnetic levitation device is provided in a DL sintering machine. In FIG. 1, the sintering raw material stored in the sintering loss surge hopper 1 is charged into a sintering machine 2 via a raw material charging device 3 and then ignited in an ignition furnace 4, and sequentially from the surface layer to the lower layer. Sintered for After passing through the ignition furnace 4, sintering is completed and solidified from the upper layer of the sintering layer as the strand progresses. The sinter cake is produced by cooling.

The sintering reaction zone 5 where the sintering reaction is taking place is indicated by the dashed line in the figure. The upper part of the sintering reaction zone 5 has completed the sintering reaction. The part 5 — 2 in the state. The sinter cake 5-1 is placed on a pallet 2-1, 2-1, · · · · · · · · of the sintering machine 2, and a magnetic levitation device placed on a stand 6 provided independently of the sintering machine 2 By levitating by 7, the load applied to the combustion melting zone 5 and the lower raw material layer 5-2 is reduced.

As shown in FIG. 2, the magnetic levitation device 7 has a plurality of magnetic levitation devices 7 in the direction of the strand, here, five, and an array of magnetic levitation devices 7, 7 ₂ , 7 3 7 4 7 5, and each magnetic levitation device 7, 1-7 ₅ widthwise two or more The magnetic levitation elements 7-1 and 7-2 are divided and installed, each of which is not shown in detail (see Fig. 8 if necessary), but is configured as a magnetic coil type. I have. The value of the current flowing through each magnetic coil of these magnetic levitation elements can be adjusted independently, and the magnetic levitation force of each magnetic levitation device and each magnetic levitation element can be adjusted. Thereby, the magnetic levitation force with respect to the sinter cake can be changed as the pallet travels, and the magnetic levitation force can be distributed in the width direction.

The division of each magnetic levitation device into magnetic levitation elements is performed not only in the width direction but also in the strand direction as necessary. That is, as shown in FIG. 2, for example, each of the magnetic levitation devices 7, 7 to 7 ₅ also has two or more magnetic levitation elements 7—1 and 7—1 ′ in the strand direction. It is divided into 7-2 and 7-2 ', and the current value can be adjusted independently to make it possible to adjust the distribution of magnetic levitation force in the strand direction on a pallet basis. . As a result, the magnetic levitation force with respect to the sinter cake in units of ', レ can be distributed in the width direction and the Z or strand direction.

In this case, the magnetic levitation device 7, for 1-7 _5, the larger the division number of the magnetic levitation element in the width direction and the Z Oh Ruiwasu Trang de direction, control of the magnetic levitation force in the width direction and Z or scan Trang de direction However, the number of divisions is economically limited in relation to equipment costs.

In implementing the method for producing a sintered ore according to the present invention, the magnitude and distribution of the magnetic levitation force are controlled according to the sintering raw material conditions and the sintering conditions, and it is necessary to detect various state parameters. . For example, the airflow distribution in the width direction can be measured by installing an anemometer on the sintering bed. It can also be measured with an attached flow meter. On the other hand, the firing loss can be measured by a normal level meter such as an ultrasonic level meter. The distribution of the exhaust gas temperature in the width direction can be measured by a plurality of thermocouples (not shown) provided in the width direction on a wind box directly below the bullet 2-1. Further, the state of the red tropic descent of the mining section 8 can be observed with the naked eye, but it can also be configured to accurately grasp the state with an infrared camera (not shown).

Fig. 3 is a conceptual diagram illustrating a sintering operation in which a DL-type sintering machine is equipped with a contact-type magnetic levitation device consisting of a rotating band that supports a plurality of intermittently connected magnets. FIG. In FIG. 3, the sintering raw material stored in the sintering hopper 1 is charged into a sintering machine 2 via a raw material charging device 3 and then ignited in an ignition furnace 4, and sequentially from the surface layer to the lower layer. Sintered for

After passing through the ignition furnace 4, sintering is completed sequentially from the upper layer of the sintering layer as the strand proceeds, and after consolidation, it is cooled to produce a sinter cake. As in FIG. 1, the combustion melting zone 5 where the sintering reaction is taking place is indicated by a dashed-dotted line, and above the combustion melting zone 5 is the sinter cake portion 5-1 where the sintering reaction is completed. The lower part is part 5-2, which is still in the raw material state.

FIG. 4 is an enlarged perspective view showing a detailed structure of a portion where an example of a magnetic levitation device 17 composed of a rotating band that supports a plurality of intermittently connected magnets is mounted. Has two rotating bands 17-1 and 17-2 in parallel in the width direction. On the outer surface of these rotating bands 17-1 and 17-2, a plurality of magnets 18, 18 and so on are intermittently connected by connecting pins 19, 19, and so on. They are arranged in a chain. And these rotating bands 1 7 — 1, 1 7-2 Are linked to each other via sprockets 1 0-1, 1 0-1 and 1 0-2, 1 0-2, which are linked together. It is configured to receive. In the figure, 11, 11, 11, · · · are pallet wheels for moving pallets 2-1, 2-1, · · ·.

When the magnetic levitation device 17 is activated, the magnets 18, 18, 18, mounted on the rotating bands 17-1, 17-2 generate the sinter generated in the opposite pallet. The surface layer of the cake is magnetically attached, and is attracted to the corresponding sinter cake by magnetic attraction. In this state, as the pallet moves in the strand direction, the magnets in the attracted state move-so that the rotating bands 17-1 and 17-2 rotate synchronously by the above-mentioned caster pillar mechanism. Will be done.

In this configuration, when the magnetic levitation device 17 is activated, the rotating bands 17-1 and 17-2 are tensioned by the sprocket 10-the tension causes the suction to the cake 5-1 The magnets 18, 18,... Are supported against the load of the sinter cake 5-1.

As described above, the magnetic levitation device 17 in the present embodiment can directly contact the sinter cake to exert a magnetic lifting force, so that the magnetic levitation device is installed with a gap on the sinter cake. Compared to the case, the magnetic levitation does not become unstable, and the effect of improving the productivity, yield, and quality of the sinter by the magnetic levitation is stably exhibited.

Further, since no gap is formed between the magnet 18 and the sinter cake 5-1, the size of the magnet 18, for example, a permanent magnet, can be reduced. In the case of levitation devices, the amount of power required to achieve the same levitation force should be reduced. Can be.

FIG. 5 is a perspective view showing a detailed structure of an example of the intermittently connected magnet supported by the rotating belt 17 described above. In the figure, 18 and 18

• · are multiple magnets intermittently connected in a chain, 19, 19,

Is a connecting bin, and each magnet 18 is composed of a permanent magnet 18-1 magnetized in the width direction, a core member 18-2, 18-2, and a non-magnetic material supporting member 18— Consists of three. The magnetic flux generated from the permanent magnet 18-1 passes through both core members 18-2 and 18-2, and the sinter cake 5-1 located at the lower part of the support members 18-13 (see Fig. 3) To generate the desired magnetic field, it is generated so as to connect the lower ends of both core members 18-2 and 18-2. In order to prevent magnetic leakage from the side of the magnet 18 and increase magnetic efficiency, a magnetic leakage preventing member made of a non-magnetic material is further provided outside the core member 18-2 as necessary. Set up. According to this structure, each magnet can be formed compactly, and equipment costs can be reduced.

FIG. 6 is a perspective view showing a detailed structure of another example of a plurality of intermittently connected magnets. In the figure, the same components as those in FIG. 5 are denoted by the same reference numerals. Here, the magnet 18-1 ′ is formed by a magnetic coil type magnet in which a plate-shaped core is wound. I have. In this structure, the magnetic field strength of each magnetic coil type magnet 18-1 'can be changed independently, and the magnetic levitation force in the pallet width direction and / or the strand direction can be changed according to the position. Therefore, the magnetic levitation effect can be further stabilized. The magnetic levitation device 17 in this embodiment exerts the necessary magnetic levitation force while contacting the surface of the cake during the sintering process. The distance between the cake and the magnetic levitation device 17 varies. To adjust for this, In the embodiment of the sinter ore manufacturing apparatus according to the present invention, for example, as shown in FIGS. 3 and 4, a rotating band lifting / lowering device 9 is mounted on a gantry 6 supporting a rotating band 17 of a magnetic levitation device. Is provided. The height of the gantry 6 can be adjusted by the lifting device 9 to adjust the position of the magnetic levitation device 17 with respect to the sinter cake.

In the sintered ore manufacturing apparatus of the present embodiment, the width of each magnet of the plurality of intermittently connected magnets supported on the rotating belt impedes the passage of air sucked downward. It is preferable that the air flow is as narrow as possible, but the ventilation in the actual sintered layer is cross-flow, and free air can be supplied.Therefore, a slit for air supply is provided for each magnet. The shape of the magnet can be freely selected. In a small-sized sintering machine, by providing at least one rotating band equipped with a magnet at the center of the strand width direction, sufficient levitation ability can be exhibited.

As the magnet used in this embodiment, any of a permanent magnet and a magnetic coil type magnet can be used, and each magnet is usually configured by arranging a plurality of plate-shaped magnets. In the case of a magnetic coil type magnet, the magnetic levitation force can be enhanced, and the magnetic levitation force can be controlled. However, equipment such as arranging electrical contacts for power supply becomes complicated, equipment costs increase, and costs corresponding to power consumption are required. As another case, a composite type of a permanent magnet and a magnetic coil type magnet can be used. According to this, power consumption can be reduced as compared with the case of using only a magnetic coil type magnet. Furthermore, since magnets are vulnerable to heat, equipment such as water cooling and electronic cooling can be provided as necessary.However, in general, cold air is sucked from the surface of the sintering bed. Because of the environment, cooling equipment is not usually required.

—On the other hand, the magnet and the surface layer of the sintered layer Since a frictional force is applied to the magnet surface and the magnet surface may be damaged, a coating layer for protecting the surface can be provided as necessary. In this case, the magnetic levitation force decreases with an increase in the thickness of the protective coating layer. Therefore, a material that is as thin and strong as possible must be selected. As the material, a material that is abrasion-resistant and has some heat resistance, for example, a ceramic material such as silicon carbide or silicon nitride can be used.

Further, as described above, the loss on firing can be measured by a normal level meter such as an ultrasonic level meter. Normally, the air distribution is measured by installing an anemone all over the sintered bed, but it can also be measured by a flow meter with a plurality of units installed in the width direction directly below the pallet. An example of a construction using the above-described method for producing a sintered ore according to the present invention will be described.

Example 1

By sintering area 6 0 0 m ² (5 m wide XI 2 0 m scan tiger down de length) of DL Shikitetsu ore sintering machine, thickness 6 0 0 mm, the width at the negative pressure of 1 5 0 O mm aq raw Sanritsu when performing operations using a conventional magnetic levitation device direction integral ^{3 2 t / ά / m 2} , the product yield was 81. 4%. The sintering machine was stopped, and the sintering state in the sintering pallet was checked by the yield by removing the bullet at the place where sintering was completed near the mining section. The yield of both sides 20 O mm inside the pallet side was 78%, the yield of the inner half was 80%, and the other half was 82%. Measurements of the air flow distribution on the pallet during operation showed that both sides had too much wind, and that the 80% yield was partially offset by the wind.

The magnetic coil of the magnetic levitation device is divided into five equal parts in the width direction (modification of Fig. 2). The current value can be changed independently, and the magnetic coil is designed so that the ventilation is as flat as possible in the width direction. Adjusted the current value of In other words, the current values of the magnetic coils of both sides were 10% of the value of the 82% yield, and the current values of the magnetic coil of the 80% yield were reduced by 10%. However, the overall yield was improved to 82.5%, and the difference between the left and right inside was almost eliminated to 83%. At this time, the production rate hardly changed.

Example 2

By sintering area ² 8 0 m 2 (4 m wide X 7 0 m scan Trang de length) DL type iron ore sintering machine, thickness 5 0 O mm, a width direction by a negative pressure 1 0 0 O mm aq When operating with the integrated magnetic levitation system, the production rate was 32 t / d / m ² and the product yield was 81.4%. The distribution of the exhaust gas temperature in the width direction at 45 points of the strand was measured, and it was found that the temperature of one half was 350, and that of the other was 390. In addition, when the ventilation distribution in the width direction at the same point was measured, the wind speed of one half was 0.6 mZ sec, the other half was 0.75 mZ sec, and the center was 0.55 m / sec.

When the magnetic coil of the magnetic levitation device is bisected in the width direction (Fig. 2), the current value can be changed independently, and the current of the magnetic coil at 350 ° C is increased. gradually exhaust gas temperature rises reached the 3 8 0 ^e C, yield was improved to 8 5%.

Example 3

In Example 1, a magnetic levitation device consisting of a rotating band (FIGS. 3 and 4) supporting a plurality of intermittent and chain-connected magnets was used in place of the non-contact type magnetic levitation device. was performed operations by the same operating conditions, the magnetic levitation effect is stabilized, production rates are 3 3. 6 t / d / m 2, the product yield was improved to 8 2.0%.

¾ I5 "J 4

In Example 2, instead of a non-contact type magnetic levitation device, an intermittent and Three rotating bands (see Fig. 4) supporting a plurality of magnets connected in a chain are used at the center of the pallet and magnetic levitation devices placed on both sides of the pallet. The operation was performed under the same operating conditions. . The magnetic levitation device (rotating band) on the 0.75 m / sec side, where the wind speed is high, is 15% wider than the other two. In this case, the production rate is improved to 34.2 t / d / m ² , the product yield is improved to 82.4%, and the power consumption for magnetic levitation is 3 kW / t It became unnecessary by using magnets.

In the sinter control method and the manufacturing apparatus shown in FIGS. 1 and 2 described above, the magnetic levitation force is changed by shifting the position of the magnetic levitation devices or changing the distance between the magnetic levitation devices. It is difficult to arbitrarily change the position where the force acts. The sinter production method and production apparatus described below improve this point.

Fig. 7 shows the operation of a DL type sintering machine equipped with a non-contact type magnetic levitation device capable of adjusting the position in the longitudinal direction and controlling the magnetic load for air permeability control according to the present invention. It is a conceptual diagram which illustrates two states (a, b, c). In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and here, five magnetic levitation devices 7, 7 ₂ , 7 ₂ 7 ₃ , 7 ₄ and 7 ₅ show an embodiment in which they are provided at appropriate intervals and are movable independently of each other. FIG. 7 (a) shows a normal operation state, and FIG. The magnetic levitation device is arranged and operated so that the magnetic levitation force acts mainly on the zone from the middle layer up to the upper part of the lower layer of the consolidation layer, and Fig. 7 (c) shows the lower part. The figure shows the state of operation with magnetic levitation force with emphasis on.

8, the magnetic levitation device 7 is movably mounted, a perspective view showing an example of the configuration of a 1-7 _5, 9 is a front view of the device under ^, 1 0 is a side of the apparatus bottom FIG. Each magnetic levitation device 7, 1-7 _5, Example For example, as shown, the open side is a magnetic coil type having a magnetic coil 27 wound on the center leg of an E-shaped core with a cross section facing the sintered bed in pallet 2-1. It is supported by the device 20 and suspended from the bridge of the carriage 21. In this example, the magnetic levitation device 7, 1-7 _5, palette 2 -;! Magnetic levitation elements 7-1, 7-2 and 7-1 ', 7-2', which are divided into two in the width direction and the traveling direction, that is, the strand direction, respectively. As with the magnetic levitation device shown in FIG. 2, the configuration is such that the distribution of magnetic levitation force in the width direction and the strand direction can be given.

Wheels 25 and their drive motors 22 are provided at the lower part of the bogie 21. Each magnetic levitation device 1! Is on a rail 23 independent of the sintering machine. ~ 76 are independently movably mounted. 1 2 is a dedicated rail of the pallet 2-1, the drive motor 2 2 is arranged at a position higher than the wheels of the pallet 2-1, and is connected to the bogie wheel 24 by a chain 25. I have. As shown in the figure, for example, drive motors and wheels of the same specifications are provided on the opposite side of the bullet 2-1. Control such as starting and stopping is performed by the same electric signal, and smooth running is performed. Is possible.

In the sintering operation, the sintering raw material conditions and sintering conditions may fluctuate considerably, and the poor ventilation zone and the degree of poor ventilation in the sintered layer may change. The magnetic levitation device is moved so that the air can be focused. Whether or not the firing in the longitudinal direction of the sintering machine is uneven is determined by installing an anemometer on the sintering bed as usual, or by palletizing. A plurality of flow meters, thermocouples and exhaust gas analyzers can be attached in the longitudinal direction of the For example, as proposed in Japanese Patent Application No. Sho 59-23028 “Method for measuring the degree of sintering of a sintered body”, a columnar sample in the height direction of Shin Yuichi cake was collected. Then, CT tomography is performed on the columnar sample, and based on the obtained CT images, the zones of poor ventilation in the sintered layer and the degree of poor ventilation are analyzed.

The data of the poor ventilation zone and the degree of poor ventilation obtained in this way are processed by a control device such as a computer (not shown). If the poor ventilation is concentrated in the middle and / or lower layers of the sintered layer, the air permeability is impeded by the load of the sinter cake on the middle and / or lower layer of the sintered layer and the raw material layer. becomes possible and, moving as a countermeasure, as shown in FIG. 7 (b), the magnetic levitation device 7, a _7-5 in a region close to the front half portion or the ignition furnace 4 growth of sinter cake layer It is, and analyzed venting defective data each magnetic levitation device in accordance with 7, to adjust the magnetic field strength and their mutual spacing to 7 _5, in addition, magnetic levitation element 7 in each magnetic levitation device - 1 , 7-2, 7-1 ′, and 7-2 ′ are adjusted to form a suitable magnetic levitation force distribution, and are controlled so that good air permeability is given to the middle layer and the lower layer.

If poor ventilation is concentrated in the lower layer of the sintered layer, as shown in Fig. 7 (c), each magnetic levitation device 7, ~ Move intensively to the area close to the part 8. And according to the analyzed air leakage data, each of the magnetic levitation devices 7, to 7 5 and its magnetic levitation elements 7 — 1, 7 — 2, 7 — 1 ', By controlling the magnetic field strength of 7-2 ′, a suitable magnetic levitation force distribution is formed intensively in the lower layer of the sintered layer, and is controlled so that good air permeability is given.

In this method and apparatus for manufacturing a sintered ore it is to change the arrangement of the magnetic levitation device 7, to 7 _5, particularly along the longitudinal direction of the sintering machine, the sintering progresses The magnetic levitation force acting on the sinter cake layer at each position in the middle is changed. As a result, the load of the sinter cake layer exerted on the combustion melting zone 5 changes due to the magnetic levitation force, and therefore, the thickness of the sinter cake layer at each position during sintering, that is, a certain depth of the sintering bed In this case, the load on the combustion melting zone 5 can be adjusted to set specific load control conditions.

FIG. 11 illustrates various load control conditions, and is a characteristic diagram showing the relationship between the depth D of the sintering bed and the load L of the combustion melting zone in a pattern. The illustrated example is a case of a sintered layer having a thickness of 600 mm. Fig. 11 (a) shows the relationship pattern in the state where no magnetic levitation force is applied.In the combustion melting zone, only the load due to air suction is applied to the uppermost layer, and it depends on the depth of the sintering bed. This indicates that the load from the thin cake that grows with the load from air suction is proportionally received. Figure 1 1 (b), FIG. 1 1 (c) and FIG. 1 1 (d) is a magnetic levitation equipment 7, by adjusting the placement and or their magnetic field strength of ~ 7 _5, the load combustion melting zone is subjected Fig. 11 (b) shows an example of a change to three patterns. When the load is reduced to zero, Fig. 11 (c) shows magnetic levitation only in the middle layer, that is, when magnetic levitation is applied to the sinter cake that has grown to the middle layer, and the load in the middle layer is reduced to zero. (d) illustrates the magnetic levitation of the lower layer only, that is, the load control condition when the magnetic levitation is applied to the sinter cake grown to the lower layer and the load on the lower layer is zero.

Fig. 12 is a table showing the results of sintering under the various load control conditions in Fig. 11, where a to d correspond to the load control condition patterns (a) to (d) in Fig. 11, respectively. ing. The FFS (Flame Front Speed is the descent speed of the Kotus combustion front. As is evident from the sintering results, the sinter cake load and the air suction load on the middle and lower combustion melting zones and the raw material layer during the sintering were reduced by the magnetic levitation force. By reducing the load to zero, the sintering speed (FFS) increases and the sintering time is shortened, but there is no decrease in yield or loss of sintering. A special sintering effect that sintering can be eliminated is achieved.

In the example described above, the load control conditions as shown in FIG. 11 are set only by the magnetic levitation device. The load control by the load can be combined. The stand is composed of a plurality of plate-like support members 28, 28, erected on the bottom surface of the bullet 2-1 as shown by dotted lines in FIG. 8, for example. If the sinter cake load, especially in the lower part of the sintered layer, is supported instead of the magnetic levitation force, the magnetic levitation range shared by the magnetic levitation device to set the load control conditions described above is minimized. Therefore, it is possible to reduce the size and power consumption of the magnetic levitation device. Fig. 13 shows the composite form of the magnetic levitation device combined with the stand. FIG. 7 is a diagram for explaining the load control of the sintered layer with a layer height of 600 mm in the air suction type sintering method at a negative pressure of 100 O mmaq by magnetic levitation and a stand. States with different ranges of sharing And with aspects not provided even with both (base) is shown. Here, in the three embodiments, the stands of 15 O mm, 25 O mm and 35 O mm in height are combined with the magnetic levitation device, and the magnetic levitation range is The upper layer has a range of up to 40 Omm.

That is, the load control condition is Base: no magnetic levitation

150: Depth 200 to 450 mm magnetic levitation

Depth 450-600 mm stand

250: Depth 200 to 350 mm magnetic levitation

Depth 350 to 600 mm stand

350: Magnetic levitation depth 200 to 250 mm

Depth 250-600 mm Stand

It is.

FIGS. 14 (a) to 14 (d) show the sintering effect of the sintering method using the composite magnetic levitation apparatus of the above three embodiments together with the sintering method of the base without load control. Fig. 14 (a) is the production rate, Fig. 14 (b) is the yield, Fig. 14 (c) is the FFS, and Fig. 14 is a characteristic diagram for comparison and explanation. 14 (d) shows the sintering effect of burnout. According to this method, a sufficient sintering effect is exhibited as compared to a base without load control, and even if a stand is partially used instead of magnetic levitation, the air permeability adjustment effect by load control is sufficient. It shows that it can be used for In particular, the load control of the lower layer can be achieved by the stand without losing the sintering effect of magnetic levitation, which is extremely practical.

In implementing the method and apparatus for producing a sintered ore by magnetic levitation described above, it is desirable to increase the relative permeability of the surface layer of the sinter cake in order to effectively apply magnetic levitation. Since the relative magnetic permeability varies depending on the sintering raw material conditions and sintering conditions, in order to secure stable and strong magnetic properties, for example, iron powder, scrap small pieces, poor reduced iron powder, Steel or the like can be attached or mixed. These are introduced onto the sintering raw material layer before ignition by, for example, dropping. Industrial applicability

As described above, according to the method and the apparatus for manufacturing a sintered ore of the present invention, the unevenness of the sintered state in the width direction of the sintered ore is corrected, the yield is improved, the quality is stabilized, and the like. A further improvement in the magnetic levitation effect is achieved, especially in the production of air-sintered sinters, the distribution of the pressure gradient based on the suction blower pressure or the load distribution of the Shin-Yuichi cake is calculated. The downward force applied to the sintering combustion and melting zone is adjusted by a rotating zone equipped with a connected magnet, and sintering is performed under the condition that a levitation force is applied to the sinter cake, so that the sinter cake magnetic The levitation effect is always exhibited stably, which makes it possible to improve productivity, improve the yield, and further stabilize the quality in the sinter production process.

Claims

The scope of the claims

1. When sinter is manufactured by the air suction sintering method, the surface of the raw material layer is ignited, and after the sintering starts in the upper layer of the raw material layer, a magnetic field is applied to the baked Shin Yuichi cake. In a method for producing a sintered ore in which sintering proceeds under a state in which a magnetic levitation force is applied,

A method for producing sinter, characterized by sintering with a distribution of magnetic levitation force in the width direction perpendicular to the direction of the sintering strand.

2. When producing sinter by the air suction type sintering method, the surface of the raw material layer is ignited, sintering starts in the upper part of the raw material layer, and a magnetic field is applied to the sintered sinter cake. In a method for producing a sintered ore in which sintering proceeds under a state in which a levitation force is applied,

The sinter is characterized by controlling the distribution of air flow in the width direction perpendicular to the direction of the sintering strand and the distribution of magnetic levitation force so that the Z or firing loss is constant. Production method.

3. When producing sinter by the air suction sintering method, the surface of the raw material layer is ignited, sintering starts in the upper layer of the raw material layer, and a magnetic field is applied to the baked Shin Yuichi cake. In a method for producing a sintered ore in which sintering proceeds under a state in which a magnetic levitation force is applied,

The sintering is controlled by controlling the distribution of the magnetic levitation force so that the exhaust gas temperature distribution in the width direction perpendicular to the direction of the sintering strand and / or the state of red tropical descent in the width direction in the mining area is constant. A method for producing sintered ore characterized by performing

4. A sintering machine that produces sinter by the air suction sintering method, and after igniting the surface of the raw material layer and sintering in the upper layer of the raw material layer, a magnetic field is applied to the baked Shin Yuichi cake. In a sintered ore manufacturing apparatus provided with a magnetic levitation device for applying a magnetic levitation force,

At least the magnetic levitation device must be perpendicular to the direction of the sintering strand. An apparatus for producing a sintered ore having a plurality of magnetic levitation elements divided in a width direction.

5. When producing sinter by the air suction sintering method, sintering is started by igniting the raw material packed bed, sintering of the surface layer is completed, and the formation of Shin-Yuichi cake on the surface layer is started. In the section from the time of the strike to the mining section behind the strand, it is arranged in direct contact with the surface of the sinter cake, and it moves intermittently in the direction of the strand in synchronization with the strand. A method for producing sinter, characterized by magnetizing a sinter cake on a strand with a number of magnets and sintering the sinter cake while continuously applying a buoyancy to the cake.

6. The method for controlling a sintering term according to claim 5, wherein the position of the magnet is adjusted up and down with respect to the sinter cake, and the sintering weight distribution in the strand width direction or the air flow rate through the sintering bed. A method characterized by making the distribution uniform and controlling the levitation force acting on the cake.

7. A sintering machine that produces sintered ore by air suction type sintering, and a strand from the position where the baking of the surface layer of the raw material packed bed is completed and a thin cake is formed on the surface layer In the section up to the mining section in the rear, it moves in direct contact with the strand in the direction of the strand in direct contact with the surface of the sinter cake, and magnetizes the sinter cake on the strand. The sinter includes a plurality of magnets intermittently connected in a strand direction capable of continuously applying a levitation force to the cake, and a mechanism for supporting and moving the plurality of intermittently magnets. A sinter ore production apparatus characterized by the following.

8. The sinter ore manufacturing apparatus according to claim 7, wherein the mechanism for supporting and moving the plurality of intermittently connected magnets has a seamless chain shape for connecting and supporting the individual magnets. A device having a rotating band, and a drive and control unit for rotating and moving the rotating band.

9. When sinter is manufactured by the air suction sintering method, the raw material layer is ignited, sintering is started in the upper layer of the raw material, and then a magnetic field is applied to the sinter cake in the upper layer where firing is completed. In a sinter ore manufacturing method in which sintering proceeds while a levitation force is applied, control is performed so that a magnetic levitation force is applied to a poorly ventilated portion obtained from air information in the height direction of the sintered layer. A method for producing a sintered ore.

10. The method for producing a sintered ore according to claim 9, wherein the magnetic levitation force is applied to a lower part of the sintered layer including at least a middle part thereof. .

11. The method for producing a sintered ore according to claim 9 or 10, characterized in that a CT image analysis of a cross section in the height direction of the sinter cake is used as aeration information. Production method.

12. The method for producing a sintered ore according to any one of claims 1 to 3, or any one of claims 9 to 11, wherein, in order to adjust the ventilation in the lower layer part, Sinter production method characterized by combining load control with a stand instead of magnetic levitation <13. Sintering machine that produces sinter by air suction sintering method One or more magnetic levitation devices for applying a magnetic levitation force to the sintering layer that can be moved in the longitudinal direction, and poorly ventilated areas obtained from the airflow information in the height direction of the sintering layer And a control device for moving the magnetic levitation device so as to apply a magnetic levitation force to the sinter.

14. The sinter production apparatus according to claim 13, wherein a magnetic levitation device is mounted, and the trolley can move to an arbitrary position in a longitudinal direction of the sintering machine. And a dedicated rail for running the sinter.

15. The sinter according to claim 4, claim 13 or claim 14. A sintering ore manufacturing apparatus, further comprising a stand provided on a sintering machine below a sintering layer.