CN103757152A - Method and device for treating steel slag - Google Patents
Method and device for treating steel slag Download PDFInfo
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- CN103757152A CN103757152A CN201410002946.1A CN201410002946A CN103757152A CN 103757152 A CN103757152 A CN 103757152A CN 201410002946 A CN201410002946 A CN 201410002946A CN 103757152 A CN103757152 A CN 103757152A
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Abstract
The invention provides a method for treating steel slag. The method comprises the steps of feeding silicon-aluminum acidic oxide and steel slag, wherein the total mole ratio of the silicon-aluminum acidic oxide to basic oxide in the mixture is 1:(2.5-2.9); heating and mixing the mixture in a rotary kiln in the presence of a reducing agent, wherein the temperature of the rotary kiln is 1350-1450 DEG C; granulating the product into particles, performing water quenching and cooling, then falling the particles into water, and performing dehydration; and performing magnetic separation on the dehydrated particles to ensure that steel particles are separated from series silicate particles. The invention also provides a device for treating the steel slag, and the device comprises a rotary kiln (5), a coal spraying device (6) which is arranged at the upper end of the tail of the rotary kiln (5), and a granulation wheel (8) which is arranged below a discharge chute (7) in the lower end of the tail of the rotary kiln (5). The series silicates obtained after the treatment of the steel slag by adopting the method disclosed by the invention can replace a silicate cement clinker to produce cement. The method disclosed by the invention realizes comprehensive utilization of industrial wastes.
Description
Technical field
The present invention relates to metallurgical technology field, particularly, relate to process for treating steel slag.
Background technology
At present, oxygen top blown converter steel making is the main flow technique of steel-making.Oxygen top blown converter steel making technique is as follows: packing into after steel scrap and hot metal charging, shaking positive body of heater.In the time of decline oxygen rifle, by the subsidiary material chute of fire door top, add appropriate slag making materials (as unslaked lime, calcining White Cloud Mountain, fluorite etc.), slag making materials swims in weld pool surface.When oxygen rifle is down to regulation rifle position, be blown into hyperbaric oxygen air-flow (purity is greater than 99%), carbon generation oxidizing reaction in oxygen and high temperature liquid iron generates carbon monoxide to reduce carbon content, simultaneously also with high temperature liquid iron in silicon, manganese and a part of ferro element generation oxidizing reaction generate the corresponding oxide such as silicon-dioxide.
Although under the disturbance of hyperbaric oxygen air-flow, melt is stirred rolling, the silicon-dioxide of generation be originally added to molten steel top layer and swam in surperficial slag making materials, by melt, stirs rolling and is in contact with one another generation alkaline-earth metal (calcium, magnesium) silicate and silicofluoride.After silicon-dioxide generates corresponding salt, physical property changes, and reduced viscosity is easy to and molten steel separation removal.But because silicon-dioxide viscosity is larger, and homodisperse generates in molten steel, even if produce in molten steel disturbance under the effect of stirring, silicon-dioxide and slag making materials be contact reacts fully, for guaranteeing that silicon-dioxide is by whole chemical combination, slag making materials, by a large amount of excessive uses, makes a large amount of calcium, magnesium oxide surplus, with the form of free calcium oxide, free magnesium, remains.Like this, be converted into alkaline-earth metal (calcium, magnesium) silicate and silicofluoride with the slag making materials of silicon dioxde reaction, through producing in molten iron (molten steel) disturbance the pyroprocess stirring, be not converted into free calcium oxide, free magnesium with the slag making materials of silicon dioxde reaction, these materials form in the lump slag and discharge.
Be converted into alkaline-earth metal (calcium, magnesium) silicate with the slag making materials of silicon dioxde reaction and its mineral structure of silicofluoride identical with Portland clinker, but through pyroprocess, be not converted into free calcium oxide, free magnesium with the slag making materials of silicon dioxde reaction, these a large amount of f-CaO, f-MgO formation temperatures that exist are higher, advantages of good crystallization, hydration activity is low, thereby hydration rate is very slow.
After f-CaO meets water, aquation forms Ca (OH)
2, volumetric expansion 98%, after f-MgO meets water, aquation forms Mg (OH)
2, volumetric expansion 148%, easily causes the expansion in hardening of cement later stage.Therefore, if utilize the advantage of slag mesosilicic acid salt cement Clinker Composition, slag is applied at building materials field as hydraulic cementing materials, a large amount of f-CaO, f-MgO that exist will cause cement products stability defective, make slag directly as hydraulic cementing materials, be applied to building materials field.
Summary of the invention
Technical problem to be solved by this invention is: clear up slag Free CaO (f-CaO), free magnesium (f-MgO) and their impact, make slag directly as hydraulicity gelatinous material, replace Portland clinker, thereby be applied to building materials field.
On the one hand, the invention provides a kind of process for treating steel slag, the method comprises:
(1) sial acidic oxide and slag are fed intake, wherein, the sial acidic oxide in the compound that the sial acidic oxide of input and slag form and the mol ratio of basic oxide are 1:2.5-2.9, preferably 1:2.7;
(2) at kiln temperature, be 1350-1450 ℃, under reductive agent exists, compound heats mixing in rotary kiln;
(3) product that step (2) obtains is particle by granulation, then carries out shrend and cooling, fall into the water afterwards, then through processed;
(4) particle after dehydration is carried out to magnetic separation separation, thus steel grit is separation with serial silicate granules.
Aforesaid process for treating steel slag, the reductive agent in step (2) is the mixture of carbon monoxide and coal dust.
Aforesaid process for treating steel slag, by spray into coal dust firing in rotary kiln, to make kiln temperature be 1350-1450 ℃, the mixture that products of combustion contains carbon monoxide and coal dust, as the reductive agent in step (2).
Aforesaid process for treating steel slag, described slag is red heat slag.
Aforesaid process for treating steel slag, in step (1), the source of the sial acidic oxide feeding intake is red heat blast furnace slag, silicon ash or flyash, preferred powder coal ash.
Aforesaid process for treating steel slag, the kiln body of described rotary kiln is installed with the obliquity of 3%-6%.
Aforesaid process for treating steel slag, in step (2), along the steel slag particle of material bed surperficial landing, under kiln body 3%-6% obliquity and rotary kiln revolution acting in conjunction, moves to rotary kiln low side.
Aforesaid process for treating steel slag, in step (3), the product that step (2) obtains throws away small-particle by granulating wheel granulation, and small-particle contacts with the current that spray in flight way, carries out shrend and cooling, then falls into pond, then through processed.
Aforesaid process for treating steel slag, step (1) before, is first carried out slag collection, and the haulage time that the slag of collection is transported to slag processing place is controlled in 30min.
Aforesaid process for treating steel slag, described method slag granularity after treatment is less than 5mm, and after magnetic separation separates, in steel grit, metal Ferrum content is greater than 95wt.%.
Aforesaid process for treating steel slag, after described method slag after treatment separates by magnetic separation, in serial silicate granules, metal Ferrum content is less than 1wt.%, and f-CaO content is less than 1.5wt.%, and f-MgO content is less than 1.1wt.%.
On the other hand, the invention provides a kind of device for aforesaid process for treating steel slag, this device comprises:
Rotary kiln (5);
Coal injection device (6), is arranged on the afterbody upper end of rotary kiln (5);
Granulating wheel (8), is arranged on the below of the discharging chute (7) that is positioned at rotary kiln (5) afterbody lower end.
Aforesaid device, further comprises:
Charging chute (4), one end connects tipple (2), and the other end connects rotary kiln (5);
Buffer bin (13), its front end sets gradually bucket elevator (11), elephant trunk (I) (12), and elephant trunk (I) (12) is arranged between bucket elevator (11) and buffer bin (13); Buffer bin (13) arranges feeding metering device (14) under storehouse, and feeding metering device (14) is connected with charging chute (4) by elephant trunk (II) (15);
Gas skirt (16), is arranged on the head of rotary kiln (5), and gas skirt (16) is connected with tubular heat exchange (17) by utilidor, sets gradually sack cleaner (18) and centrifugal blower (19) after tubular heat exchange (17).
Aforesaid device, described rotary kiln (5) adopts the rotary furnace of 35-45m.
Aforesaid device, the kiln body of described rotary kiln (5) is installed with the obliquity of 3%-6%.
Aforesaid device, the level inclination of described charging chute (4) is 50-80 degree.
Adopt method of the present invention can realize the comprehensive utilization of trade waste, on the one hand, can effectively clear up free calcium oxide and free magnesium and impact thereof in slag, slag directly be replaced to Portland clinker as hydraulicity gelatinous material, thereby be applied to building materials field; On the other hand, method of the present invention adopts reducing atmosphere, and making the Reduction of Oxide of part iron is metallic iron, thereby has improved the recovery utilization rate of steel scrap in slag.
Accompanying drawing explanation
Fig. 1 is the structural representation of method equipment therefor of the present invention.
Wherein, the implication of Reference numeral is described as follows:
1-slag ladle
2-tipple
3-device for removing slag
4-charging chute
5-rotary kiln
6-coal injection device
7-discharging chute
8-granulating wheel
9-pond
10-grab bucket
11-bucket elevator
12-elephant trunk (I)
13-buffer bin
14-feeding metering device
15-elephant trunk (II)
16-gas skirt
17-tubular heat exchange
18-sack cleaner
19-centrifugal blower
Embodiment
Below with reference to Fig. 1, present invention is described, and processing method of the present invention is except following content, and all the other all adopt ordinary method or the device of this area.
The device that process for treating steel slag of the present invention adopts comprises: rotary kiln (5); Coal injection device (6), is arranged on the afterbody upper end of rotary kiln (5); Granulating wheel (8), is arranged on the below of the discharging chute (7) that is positioned at rotary kiln (5) afterbody lower end.
In addition, this device further comprises:
Charging chute (4), one end connects tipple (2), and the other end connects rotary kiln (5);
Buffer bin (13), its front end sets gradually bucket elevator (11), elephant trunk (I) (12), and elephant trunk (I) (12) is arranged between bucket elevator (11) and buffer bin (13); Buffer bin (13) arranges feeding metering device (14) under storehouse, and feeding metering device (14) is connected with charging chute (4) by elephant trunk (II) (15);
Gas skirt (16), is arranged on the head of rotary kiln (5), and gas skirt (16) is connected with tubular heat exchange (17) by utilidor, sets gradually sack cleaner (18) and centrifugal blower (19) after tubular heat exchange (17).
Wherein, rotary kiln (5) adopts the rotary furnace of 35-45m.The kiln body of rotary kiln (5) is installed with the obliquity of 3%-6%.The level inclination of charging chute (4) is 50-80 degree.
All conventional commercial the obtaining of each equipment that device of the present invention is related.
The device adopting below in conjunction with process for treating steel slag of the present invention elaborates to process for treating steel slag of the present invention, and process for treating steel slag of the present invention comprises the steps:
(1) sial acidic oxide and slag are fed intake.Particularly, slag in slag ladle 1 acts on via tipple 2, by charging chute 4, be given to rotary kiln 5, sial acidic oxide (flyash or silicon ash) is given in buffer bin 13 by bucket elevator 11, elephant trunk (I) 12, feeding metering device 14 dosings under buffer bin 13 storehouses, through elephant trunk (II) 15, feed into charging chute 4 again, thereby enter rotary kiln 5 together with slag.
Wherein, slag refers to the slag that steel-making is discharged, and is a kind of industrial solid wastes, according to the type of furnace, is divided into bessemer furnace slag, open hearth slag and electric furnace slag.Slag is mainly comprised of silicate and the silicofluoride of alkaline-earth metal (being mainly calcium, magnesium), contains in addition free calcium oxide (f-CaO) and free magnesium (f-MgO) etc., also contains a certain amount of SiO
2and Al
2o
3.
Wherein, the handled slag of the present invention is mainly red heat bessemer furnace slag, the slag of just discharging from steel-making converter.Make red heat slag in rotary kiln, heat " continuation " reaction, the method of this " striking while the iron is hot " is simple, easily row, energy consumption are low, while having avoided cooled slag and acidic oxide to carry out reacting by heating, need carry out broken abrasive dust to slag, just can carry out the existing method complexity of secondary reaction, problem that energy consumption is high.Particularly, the slag (being red heat slag) of discharging from converter is transported to slag processing place collecting with slag ladle 1 fast, and haulage time was controlled in 30 minutes, to avoid heat energy dissipation to cause slag surface crust; Be transported to behind slag processing place, by tipple 2, pour slag into charging chute 4 rapidly and be given to rotary kiln 5, if there is crust phenomenon in slag, can first use device for removing slag 3 that slag ladle 1 top caking or inner bulk are smash to material, skimmed, to avoid molten steel slag to break through suddenly shell, large steel slag pours in charging chute 4 and causes and overflow or putty, pours slag into charging chute 4 be more afterwards given to rotary kiln 5 by tipple 2.The level inclination of charging chute 4 is set as 50-80 degree, can guarantee that like this slag of pouring charging chute 4 into slips into rotary kiln 5 automatically, thus make method of the present invention more simply, easily go.
Wherein, the sial acidic oxide in the compound that the sial acidic oxide of input and slag form and the mol ratio of basic oxide are 1:2.5-2.9.Sial acidic oxide and calcium magnesium basic oxide the most useful the generated compound that reacts is C
3s, is set as 1:2.5-2.9 by the mol ratio of total sial acidic oxide and calcium magnesium basic oxide, can guarantee to make free calcium oxide and free magnesium in slag fully to react, thereby realizes the object of clearing up, and can guarantee to have in reaction product again the C of high level
3the C of S and less content
2s, CS, C
2s, CS compare C as the effect of hydraulicity gelatinous material
3s is poor.Sial acidic oxide in the compound that the sial acidic oxide dropping into and slag form and the mol ratio of basic oxide are preferably 1:2.7.
Wherein, sial acidic oxide refers to SiO
2and Al
2o
3, the material of adding sial acidic oxide can be red heat blast furnace slag, silicon ash or flyash, is preferably flyash.
Wherein, blast furnace slag refers to the refuse of discharging from blast furnace while smelting the pig iron, when smelting the pig iron, and furnace charge melting, ash content in gangue, coke in ore and solubility promoter and other impurity that can not enter the pig iron form the slag as leading take silicate and aluminate, and the main component of blast furnace slag is SiO
2, Al
2o
3and CaO; When adding sial acidic oxide with red heat blast furnace slag, red heat blast furnace slag and red heat bessemer furnace slag can adopt same device interval to add, be that slag ladle lifting gear is mentioned slag ladle 1, via tipple 2, act on, by charging chute 4, add 5, two kinds of material joining days of rotary kiln to be all controlled in 3-5min and to complete red heat bessemer furnace slag and red heat blast furnace slag interval.
Silicon ash, claims again micro-silicon ash or cohesion silicon ash, is while smelting silicon-containing alloy (as ferrosilicon) and industrial silicon (claiming again Pure Silicon Metal), from mineral heating furnace flue recovery with SiO
2micro mist is main dust, and it is the by product during industry is smelted, and with regard to chemical composition, the main component of silicon ash is SiO
2, be secondly Al
2o
3, contain in addition a small amount of Fe
2o
3, MgO and CaO etc.; Flyash refers to that modern large coal-fired boiler grinds coal dust to 100 μ m when fire coal, then coal dust and high speed oxygen flow mix, spray in hearth combustion band, the organic substance in pulverized coal particle is fully burned, the fine powder reclaiming from flue gas is flyash.The mixture that coal is comprised of many kinds of substance, wherein incombustible mineral substance is decomposed and separates out as ash after burning, becomes ash or slag, the mineral residue that it is comprised of oxide compounds such as silicon, aluminium, iron, calcium, magnesium after cooling.The chemical composition of flyash depends on coal-fired composition.Wherein, flyash ubiquity is easy to obtain, and quantum of output is large, belongs to large industrial solid castoff.
(2), at 1350-1450 ℃, under reductive agent exists, the material that is rich in sial acidic oxide of adding is heated and mixed with the compound of slag composition.
Wherein, the kiln body of rotary kiln 5 is installed with the obliquity of 3%-6%, the compound frictionally that enters rotary kiln 5 is risen by kiln cornice, take certain altitude to, mixture particle is under the effect of gravity, along bed of material surface landing, get off, because the existence of kiln body obliquity, and constantly revolution, so material particles can not fallen original position, but move a distance to the low side of kiln, dropped on a new point, at this new point, be brought to again certain altitude and fall again another point by low side, so constantly advance.Constantly take up with falling process in, in mixture particle from Dicalcium Phosphate (Feed Grade), free calcium oxide and the free magnesium of slag, with the abundant contact reacts of the material that is rich in sial acidic oxide of adding, form essential mineral---the tricalcium silicate of Portland clinker.The main chemical reactions occurring in this process is as follows:
2CaO·SiO
2+CaO→3CaO·SiO
2
SiO
2+3CaO→3CaO·SiO
2
Al
2O
3+3CaO→3CaO·Al
2O
3
Al
2O
3+Fe
2O
3+4CaO→4CaO·Al
2O
3·Fe
2O
3
Compound, in rotary kiln 5 motion folding processes, has heat loss.Therefore, at rotary kiln 5 afterbodys, establish coal injection device 6, spray into coal dust firing, thereby control combustion condition makes the interior temperature of rotary kiln 5 between 1350 ℃-1450 ℃, coal injection device 6 comprises coal burner (burner).In addition, by controlling the ratio of coal dust and air so that the mixture that the product of coal dust firing contains carbon monoxide and coal dust (namely making coal dust generation " black flame " burn), the mixture of carbon monoxide and coal dust can be used as reductive agent, thereby make to present reducing atmosphere in rotary kiln 5, with the metallic iron oxidation that prevents that slag from carrying secretly, and to make the Reduction of Oxide of part iron in slag be metallic iron.After being injected into, coal dust is full of whole rotary kiln 5 with fine particle shape, and CO (carbon monoxide converter) gas is also full of in rotary kiln 5, thereby reductive agent can fully contact with the compound in rotary kiln 5, thereby can better prevent the metallic iron oxidation that slag carries secretly, and to make the Reduction of Oxide of part iron in slag be metallic iron.Wherein, those skilled in the art can regulate to realize to the ratio of coal dust and air " black flame " burning according to coal dust quality and concrete combustion conditions.
This step reaction process, for supplementing chemical combination, can adopt the rotary furnace of 35-45 rice.
(3) product that step (2) obtains is particle by granulation, then carries out shrend and cooling, falls into the water afterwards.
Particularly; red heat slag flows out from rotary kiln 5 after supplementing chemical combination; the melts flowing out consists of molten iron and serial silicate; the melts of this outflow falls into through discharging chute 7 on the granulating wheel 8 of internal water cooling and rapidly rotation; on granulating wheel 8, slag throws away with fine granularity; due to molten iron (molten steel) and the difference of slag (serial silicate) physical properties, in flight course, the two is separated.The small-particle being thrown away by granulating wheel 8 contacts with the current that spray in flight way, carries out shrend and cooling, then falls into pond 9.
(4) after particle dehydration, carry out magnetic separation separation, thereby steel grit and serial silicate are separated.
Particularly, the particle grab bucket 10 that falls into pond 9 catches, after the particle dehydration catching, need to adopt the mode of magnetic separation that steel grit is separation with serial silicate, steel grit is recycled as steel scrap, and serial silicate substitutes Portland clinker as hydraulic cementing materials and uses.
In addition, rotary kiln 5 heads are provided with gas skirt 16, the draft that gas skirt 16 forms by centrifugal blower 19, rotary kiln 5 tail gas that contains carbon monoxide and air out sucked in the lump, carbon monoxide is inhaled into the whole oxidizing fires of air, by utilidor, enter tubular heat exchange 17 gas recovery waste heats, the tail gas after cooling, by after sack cleaner 18 dedustings, is aspirated and is discharged with qualified discharge by centrifugal blower 19.
Adopt method of the present invention slag granularity after treatment to be less than 5mm, the magnetic separation of dehydration particle, in serial silicate granules, metal Ferrum content is less than 1wt.%, and free calcium oxide is less than 1.5wt.%, and free magnesium is less than 1.1wt.%; The iron level that metallizes in recovery steel grit is greater than 95wt.%.
The serial silicate granules Minerals (wt.%) composed as follows reclaiming:
C
2S+M
2S＜20%
C
3S+C
3A+C
4AF+M
3S+M
3A+M
4AF＞70%
f-CaO＜1.5%
f-MgO＜1.1%
Wherein, C
2s refers to Dicalcium Phosphate (Feed Grade), M
2s refers to silicic acid two magnesium, C
3s refers to tricalcium silicate, C
3a refers to tricalcium aluminate, C
4aF refers to tetracalcium aluminoferrite, M
3s refers to silicic acid three magnesium, M
3a refers to aluminic acid three magnesium, M
4aF refers to iron aluminic acid four magnesium.
The serial silicate reclaiming can directly substitute Portland clinker as hydraulicity gelatinous material and use.(oblique system mineral, main chemical compositions is CaSO for the serial silicate obtaining after method processing slag of the present invention and gypsum
4, can conventional commercial obtaining, for example, purchased from Etuoke Banner Hua Wei gypsum factory), flyash is in the ratio of 87wt.%, 5.0wt.%, 8.0wt.%, adopts traditional grinding technique jointly to grind, specific surface area is 400m
2more than/kg.According to GB/T17671-1999 Test method for strength of hydraulic cement mortar (ISO method), measure, within three days, folding strength is greater than 4.3MPa, and within three days, ultimate compression strength is greater than 19.7MPa, and within 28 days, folding strength is greater than 8.2MPa, within 28 days, ultimate compression strength is greater than 51.3MPa, and stability is qualified.
Embodiment
Embodiment 1
Certain produces the steel mill of 2,300,000 tons of steel per year, and supporting two 120 tons of converters adopt molten iron " three is de-" technique rear converter slag annual production to be about ten thousand tons of 28-30.The main component (wt.%) of the converter slag after molten iron " three is de-" is as shown in table 1.
Table 1 converter slag composition (wt.%)
Select the flyash of certain coal-burning power plant as sieve and silica-sesquioxide supplementary material, (wt.%) is as shown in table 2 for chemical composition of PCA.
Table 2 fly ash in electric power plant composition (wt.%)
The slag producing from converter is transported to slag with slag ladle and processes scene, and haulage time should be controlled in 30 minutes, and to guarantee slag temperature, slag pours by tilting mechanism the chute that connects material into.Due to the temperature drop of transportation generation, if in slag ladle there is crust phenomenon in slag surface, can adopt slag removal machine to smash material, skimming punctures crust layer, to avoid molten steel slag to break through suddenly shell, large steel slag pours in the chute that connects material and causes and overflow, every tank can be transported into slag 19-21 ton, and on average adding of every tank slag is about 30 minutes interval time.According to the weight that adds slag, add appropriate flyash, the add-on of corresponding every tank slag is added flyash 3.5-4.0 ton.Concrete operations are as follows:
Flyash is given in buffer bin 13 standby by bucket elevator 11, elephant trunk (I) 12, the slag ladle 1 being transported into from converter production station is delivered to slag ladle lifting gear.
Slag ladle lifting gear is mentioned slag ladle 1, via tipple 2, act on, by charging chute 4, slag is given to rotary kiln 5, simultaneously, by the feeding metering device 14 under buffer bin 13 storehouses quantitatively by 3.5-4.0 ton flyash feed, through elephant trunk (II) 15, feed into charging chute 4 again, thereby entering 5, two kinds of material joining days of rotary kiln together with slag is all controlled in 3-5 minute and completes.
In rotary kiln 5, carry out material contact, acidic oxide and basic oxide carry out chemical combination.Corresponding this instance processes amount, selects the rotary kiln of Φ 2.8 × 35m, and mounted angle is 3%.
At rotary kiln 5 afterbodys, establish coal injection device 6, coal injection device 6 comprises coal burner (burner), and fine grinding coal dust is injected into burner combustion, control coal dust and AIR Proportional, make products of combustion be reduction-state, i.e. " black flame " burning, keeps kiln temperature between 1350 ℃-1450 ℃.Rotary kiln rotating speed 1.0-2.0r/min.
Above-mentioned material is by flowing out from afterbody chute 7 after rotary kiln 5, and material drops on granulating wheel 8 through chute 7 guiding, and granulating wheel 8 specifications are Φ 1000 × 800mm, rotating speed 200-330r/min.
The material dropping on granulating wheel 8 is thrown away with particulate state by the granulating wheel 8 of high speed rotating; on the track of particle flight, spraying into current contacts with flight particle; current and particle together fall into pond 9; the particle grab bucket 10 that falls into pond 9 catches; after dehydration, adopt the mode of magnetic separation that steel grit is separation with serial silicate; steel grit is recycled as steel scrap, and serial silicate substitutes Portland clinker and uses.
Reclaim steel grit metal Ferrum content 96.1wt.%.
The serial silicate granules Minerals (wt.%) composed as follows reclaiming:
C
2S+M
2S=17.4%
C
3S+C
3A+C
4AF+M
3S+M
3A+M
4AF=75.6%
f-CaO=1.4%
f-MgO=1.0%
The serial silicate that the present embodiment reclaims and gypsum, flyash, in the ratio of 87wt.%, 5.0wt.%, 8.0wt.%, adopt traditional grinding technique jointly to grind, and specific surface area is 400m
2more than/kg.According to GB/T17671-1999 Test method for strength of hydraulic cement mortar (ISO method), measure, three days folding strengths are 4.5MPa, and three days ultimate compression strength is 20.1MPa, and 28 days folding strengths are 8.5MPa, within 28 days, ultimate compression strength is 52.3MPa, and stability is qualified.
Embodiment 2
Certain produces the steel mill of 3,000,000 tons of steel per year, supporting three 1080 cubic metres of blast furnaces, and three 100 tons of converters, adopt after molten iron " three is de-" technique, and blast furnace slag annual production is about ten thousand tons of 140-160, and converter slag annual production is about ten thousand tons of 36-40.The main component (wt.%) of the converter slag after molten iron " three is de-" is as shown in table 3.
Table 3 converter slag composition (wt.%)
Select blast furnace slag as sieve and silica-sesquioxide supplementary material, (wt.%) is as described in Table 4 for blast furnace slag composition.
Table 4 blast furnace slag composition (wt.%)
The slag producing from converter is transported to slag with slag ladle and processes scene, and haulage time should be controlled in 30 minutes, and to guarantee slag temperature, slag pours by tilting mechanism the chute that connects material into.Due to the temperature drop of transportation generation, if in slag ladle there is crust phenomenon in slag surface, can adopt slag removal machine to smash material, skimming punctures crust layer, to avoid molten steel slag to break through suddenly shell, large steel slag pours in the chute that connects material and causes and overflow, every tank can be transported into slag 15-16 ton, and on average adding of every tank slag is about 20 minutes interval time.According to the weight that adds slag, add red heat blast furnace slag, the interval slag ladle that adds at every tank slag is transported to slag processing scene by red heat blast furnace slag, haulage time also should be controlled in 30 minutes, to guarantee blast furnace slag temperature, blast furnace slag also pours by tilting mechanism the chute that connects material into, and every tank slag adds gap to add red heat blast furnace slag 8.5-9.0 ton.Concrete operations are as follows:
Slag ladle lifting gear is mentioned slag ladle 1, via tipple 2, acts on, and by charging chute 4, adds 5, two kinds of material joining days of rotary kiln to be all controlled in 3-5min and to complete in slag and blast furnace slag interval.
In rotary kiln 5, carry out material contact, acidic oxide and basic oxide carry out chemical combination.Corresponding this instance processes amount, selects the rotary kiln of Φ 3.2 × 35m, and mounted angle is 3%.
At rotary kiln 5 afterbodys, establish coal injection device 6, coal injection device 6 comprises coal burner (burner), and fine grinding coal dust is injected into burner combustion, control coal dust and AIR Proportional, make products of combustion be reduction-state, i.e. " black flame " burning, keeps kiln temperature between 1350 ℃-1450 ℃.Rotary kiln rotating speed 1.0-2.0r/min.
Above-mentioned material is by flowing out from afterbody chute 7 after rotary kiln 5, and material drops on granulating wheel 8 through chute 7 guiding, and granulating wheel 8 specifications are Φ 1400 × 800mm, rotating speed 200-330r/min.
The material dropping on granulating wheel 8 is thrown away with particulate state by the granulating wheel 8 of high speed rotating; on the track of particle flight, spraying into current contacts with flight particle; current and particle together fall into pond 9; the particle grab bucket 10 that falls into pond 9 catches; after dehydration, adopt the mode of magnetic separation that steel grit is separation with serial silicate; steel grit is recycled as steel scrap, and serial silicate substitutes Portland clinker and uses.
Reclaim steel grit metal Ferrum content 95.3wt.%.
The serial silicate granules Minerals (wt.%) composed as follows reclaiming:
C
2S+M
2S=18.2%
C
3S+C
3A+C
4AF+M
3S+M
3A+M
4AF=74.6%
f-CaO=1.3%
f-MgO=1.0%
The serial silicate that the present embodiment reclaims and gypsum, flyash, in the ratio of 87wt.%, 5.0wt.%, 8.0wt.%, adopt traditional grinding technique jointly to grind, and specific surface area is 400m
2more than/kg.According to GB/T17671-1999 Test method for strength of hydraulic cement mortar (ISO method), measure, three days folding strengths are 4.4MPa, and three days ultimate compression strength is 19.8MPa, and 28 days folding strengths are 8.3MPa, within 28 days, ultimate compression strength is 51.4MPa, and stability is qualified.
Claims (16)
1. a process for treating steel slag, is characterized in that, the method comprises:
(1) sial acidic oxide and slag are fed intake, wherein, the sial acidic oxide in the compound that the sial acidic oxide of input and slag form and the mol ratio of basic oxide are 1:2.5-2.9, preferably 1:2.7;
(2) at kiln temperature, be 1350-1450 ℃, under reductive agent exists, compound heats mixing in rotary kiln;
(3) product that step (2) obtains is particle by granulation, then carries out shrend and cooling, fall into the water afterwards, then through processed;
(4) particle after dehydration is carried out to magnetic separation separation, thus steel grit is separation with serial silicate granules.
2. process for treating steel slag according to claim 1, is characterized in that, the reductive agent in step (2) is the mixture of carbon monoxide and coal dust.
3. process for treating steel slag according to claim 1 and 2, it is characterized in that, by spray into coal dust firing in rotary kiln, to make kiln temperature be 1350-1450 ℃, and the mixture that products of combustion contains carbon monoxide and coal dust, as the reductive agent in step (2).
4. according to the process for treating steel slag described in claim 1-3 any one, it is characterized in that, described slag is red heat slag.
5. according to the process for treating steel slag described in claim 1-4 any one, it is characterized in that, in step (1), the source of the sial acidic oxide feeding intake is red heat blast furnace slag, silicon ash or flyash, preferred powder coal ash.
6. according to the process for treating steel slag described in claim 1-5 any one, it is characterized in that, the kiln body of described rotary kiln is installed with the obliquity of 3%-6%.
7. process for treating steel slag according to claim 6, is characterized in that, in step (2), along the steel slag particle of material bed surperficial landing, under kiln body 3%-6% obliquity and rotary kiln revolution acting in conjunction, to rotary kiln low side, moves.
8. according to the process for treating steel slag described in claim 1-7 any one; it is characterized in that; in step (3); the product that step (2) obtains throws away small-particle by granulating wheel granulation; small-particle contacts with the current that spray in flight way; carry out shrend and cooling, then fall into pond, then through processed.
9. according to the process for treating steel slag described in claim 1-8 any one, it is characterized in that, step (1) before, is first carried out slag collection, and the haulage time that the slag of collection is transported to slag processing place is controlled in 30min.
10. according to the process for treating steel slag described in claim 1-9 any one, it is characterized in that, described method slag granularity after treatment is less than 5mm, and after magnetic separation separates, in steel grit, metal Ferrum content is greater than 95wt.%.
11. according to the process for treating steel slag described in claim 1-10 any one, it is characterized in that, after described method slag after treatment separates by magnetic separation, in series silicate granules, metal Ferrum content is less than 1wt.%, and f-CaO content is less than 1.5wt.%, and f-MgO content is less than 1.1wt.%.
12. 1 kinds of devices for the process for treating steel slag described in claim 1-11 any one, is characterized in that, this device comprises:
Rotary kiln (5);
Coal injection device (6), is arranged on the afterbody upper end of rotary kiln (5);
Granulating wheel (8), is arranged on the below of the discharging chute (7) that is positioned at rotary kiln (5) afterbody lower end.
13. devices according to claim 12, is characterized in that, this device further comprises:
Charging chute (4), one end connects tipple (2), and the other end connects rotary kiln (5);
Buffer bin (13), its front end sets gradually bucket elevator (11), elephant trunk (I) (12), and elephant trunk (I) (12) is arranged between bucket elevator (11) and buffer bin (13); Buffer bin (13) arranges feeding metering device (14) under storehouse, and feeding metering device (14) is connected with charging chute (4) by elephant trunk (II) (15);
Gas skirt (16), is arranged on the head of rotary kiln (5), and gas skirt (16) is connected with tubular heat exchange (17) by utilidor, sets gradually sack cleaner (18) and centrifugal blower (19) after tubular heat exchange (17).
14. according to the device described in claim 12 or 13, it is characterized in that, described rotary kiln (5) adopts the rotary furnace of 35-45m.
15. according to the device described in claim 12-14 any one, it is characterized in that, the kiln body of described rotary kiln (5) is installed with the obliquity of 3%-6%.
16. according to the device described in claim 12-15 any one, it is characterized in that, the level inclination of described charging chute (4) is 50-80 degree.
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