CN112126781A - Complex phase pellet mining binder and use method thereof - Google Patents
Complex phase pellet mining binder and use method thereof Download PDFInfo
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- CN112126781A CN112126781A CN202011069713.5A CN202011069713A CN112126781A CN 112126781 A CN112126781 A CN 112126781A CN 202011069713 A CN202011069713 A CN 202011069713A CN 112126781 A CN112126781 A CN 112126781A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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Abstract
The invention provides a binder for complex phase pellet mine and a use method thereof, wherein the binder for complex phase pellet mine consists of powdery cementing material and anti-cracking component; the cementing material is prepared by mixing and homogenizing one or more than one of quick lime, light-burned dolomite lime and light-burned magnesium oxide, the total content of CaO and MgO in the cementing material is not less than 65 percent, and Al is added2O3The content is not more than 3.0 percent; the powder fineness of the cementing material is less than 0.045, and the anti-burst component is a fibrous material. The invention overcomes the defect of bentonite as a green ball binder, compared with the bentonite, the main components (such as CaO and MgO) of the invention are useful and beneficial for blast furnace slagging, the fibrous anti-explosion component in the invention can avoid the bursting phenomenon of the pellets in the drying and roasting processes, the technical difficulty of uniformly mixing the fibrous component and the powdery cementing material is avoided, the anti-explosion component is mixed with transmitter water necessary for iron concentrate powder pelletizing, and the invention has the advantages of simple and easy uniform mixing and dispersion.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a binder for a complex-phase pellet mine and a using method thereof.
Background
At present, because bentonite has the function of improving the green pellet performance of magnetite pelletizing, such as green pellet strength, bursting temperature and other indexes, the existing magnetite for producing oxidized pellets generally uses the technology of drying and oxidizing roasting bentonite pelletizing, and the process method has the defect that only acidic or semi-basic pellets can be produced (when the alkalinity is high, the pellets are cracked and pulverized seriously in the roasting production process, so that the operation of shaft furnace or grate rotary kiln equipment is not smooth or accidents in the pellet production process are caused). In addition, the bentonite component in the pellet has the disadvantages of large slag amount and large consumption of coke and limestone in the subsequent blast furnace ironmaking process. If the material can completely replace the bentonite, and the main components of the material are CaO, MgO and the like which are beneficial to blast furnace slagging, the material has positive significance for saving the bentonite, reducing the consumption of blast furnace iron-making slagging materials, reducing the slag amount and reducing the coke ratio.
Disclosure of Invention
The invention aims to: the invention mainly aims at the situation and overcomes the defects of the prior art, and aims to provide an alkaline pellet binder which completely replaces bentonite, has the main components of CaO, MgO and the like which are beneficial to blast furnace slagging and can prevent pellets from bursting in the drying and roasting processes.
The technical scheme of the invention is as follows: the binder for the complex phase pellet mine is provided, and consists of a powdery cementing material and an anti-cracking component; the cementing material is prepared by mixing and homogenizing one or more than one of quick lime, light-burned dolomite lime and light-burned magnesium oxide, the total content of CaO and MgO in the cementing material is not less than 65 percent, and Al is added2O3The content is not more than 3.0 percent, and the powder fineness of the cementing material is less than 0.045 mm; the anti-bursting component is a fibrous material, the mass fraction of the anti-bursting component is not more than 20% of the mass fraction of the cementing material, the fineness of the fibrous material is not more than 20 mu m, the length of the fibrous material is not more than 25mm, and the fibrous material is one or more of pulp powder, plant fiber and glass fiber.
The method for using the binder for the complex-phase pellet mine comprises the following steps:
the method comprises the following steps: preparing one or more than one raw material of quick lime, light-burned dolomite lime and light-burned magnesium oxide in the cementing material into a mixed material according to a proper proportion;
step two: crushing and grinding the mixed materials to prepare a cementing material with the fineness less than 0.045mm and uniform components;
step three: mixing an anti-bursting component with the mass fraction of the cementing material being not more than 20% with a proper amount of transmitter water to prepare a suspension of fibrous materials in the anti-bursting component uniformly distributed in the transmitter water;
step four: adding the gelled material and the anti-explosion component into a pelletizer, and spraying a proper amount of turbid liquid into the pelletizer, wherein the gelled material, the anti-explosion component and the mass agent water roll, mix, homogenize and pelletize the bonded materials together in a pellet pelletizer.
The invention has the beneficial effects that: the invention overcomes the defects that the bentonite is adopted as the green pellet binder for the pellet (such as consumption of bentonite resources and increase of blast furnace slag content), compared with the bentonite, the main components (such as CaO and MgO) of the invention are useful and beneficial for blast furnace slagging, the fibrous anti-explosion component can avoid the occurrence of the burst phenomenon of the pellet in the drying and roasting processes, the invention avoids the technical difficulty of uniformly mixing the fibrous component and the powdery cementing material, the anti-explosion component is mixed with the transmitter water necessary for the iron concentrate powder pelletizing, and the invention has the advantages of simple and easy uniform mixing and dispersion.
The specific implementation mode is as follows:
the following further describes the embodiments of the present invention in detail.
The binder for the complex phase pellet mine is provided, and consists of a powdery cementing material and an anti-cracking component; the cementing material is prepared by mixing and homogenizing one or more than one of quick lime, light-burned dolomite lime and light-burned magnesium oxide, the total content of CaO and MgO in the cementing material is not less than 65 percent, and Al is added2O3The content is not more than 3.0 percent, and the powder fineness of the cementing material is less than 0.045 mm; the anti-bursting component is a fibrous material, the mass fraction of the anti-bursting component is not more than 20% of the mass fraction of the cementing material, the fineness of the fibrous material is not more than 20 mu m, the length of the fibrous material is not more than 25mm, and the fibrous material is one or more of pulp powder, plant fiber and glass fiber.
The method for using the binder for the complex-phase pellet mine comprises the following steps:
the method comprises the following steps: preparing one or more than one raw material of quick lime, light-burned dolomite lime and light-burned magnesium oxide in the cementing material into a mixed material according to a proper proportion;
step two: crushing and grinding the mixed materials to prepare a cementing material with the fineness less than 0.045mm and uniform components;
step three: mixing an anti-bursting component with the mass fraction of the cementing material being not more than 20% with a proper amount of transmitter water to prepare a suspension of fibrous materials in the anti-bursting component uniformly distributed in the transmitter water;
step four: adding the gelled material into a pelletizer, spraying a proper amount of turbid liquid into the pelletizer, rolling, mixing, homogenizing and pelletizing the gelled material, the anti-explosion component and the transmitter water together with the bonded materials in a pellet pelletizer.
The first embodiment is as follows: the binder powder contains 60% of CaO and 12% of MgO, the fineness of the binder powder is 0.038mm (about 400 meshes), the fibrous material used by the anti-bursting component is glass fiber, the fineness of the glass fiber is not more than 8 mu m, and the length of the glass fiber is not more than 15 mm. The mass fraction of the anti-bursting component is 12% of the mass fraction of the cementing material.
The alkaline pellet binder of the present example was used:
the method comprises the following steps: 80 percent of quicklime and 20 percent of light-burned magnesia are prepared into a mixed material;
step two: crushing the mixed materials in a jaw crusher, and grinding in a ball mill to prepare a cementing material with the fineness of less than 0.038mm (about 400 meshes) and uniform components;
step three: mixing glass fiber accounting for 12% of the mass fraction of the cementing material with a proper amount of transmitter water in a container to prepare turbid liquid in which the glass fiber is uniformly distributed in the transmitter water;
step four: adding powdery cementing materials into a spherical disk type pelletizer according to 2% of the mass part of the iron concentrate powder; and simultaneously spraying a proper amount of turbid liquid into a ball disk type pelletizer, mixing iron ore concentrate powder, a cementing material of an alkaline binder and an anti-explosion component together in the ball disk type pelletizer, homogenizing and rolling into wet ore balls.
In the conventional technology, magnetite concentrate and a binder are mixed with transmitter water to prepare a compact wet ball, the compact wet ball shrinks in the drying process, and when the transmitter water is evaporated, evaporated and dried between a dried shell and a wet core under the condition of temperature difference and humidity difference between the inside and the outside of the wet ball, a plurality of drying shrinks cause that a steam channel is insufficient (or moisture of the wet core is evaporated too fast) and the steam in the wet core causes burst phenomenon in the drying and increasing process, in the embodiment, glass fiber powder is used as an anti-bursting component, the short glass fiber powder is uniformly filled in the compact wet ball in the ball manufacturing process, the glass fiber not only increases the green strength, but also forms a steam channel, thereby overcoming the defect that the steam channel is seriously insufficient due to the drying shrinkage of only a calcium oxide or magnesium oxide gelling material, and the melting temperature of the glass fiber is lower than the firing temperature 1250 ℃, so that the glass fiber forms liquid phase in the oxidizing and sintering process to raise the strength of pellet owing to the liquid phase consolidation in the pellet
The moisture of the wet ore ball of this example was found to be 12.6%, the falling (0.5 m) strength was greater than 8 times, the compressive strength of the wet ore ball was greater than 20N/ball, the high temperature burst strength of the wet ore ball of this example was 816 ℃, and no burst phenomenon occurred in the wet ore ball of this example when it was dried and fired in the grate and rotary kiln, respectively.
Example two: the powdery cementing material is prepared by taking quick lime and light-burned dolomite lime as raw materials, wherein the content of CaO in the binder powder is 56 percent, the content of MgO in the binder powder is 14 percent, the fineness of the cementing material is 0.045mm (about 325 meshes), the fibrous material used by the anti-explosion component is pulp dry powder, and the fiber length of the pulp dry powder is 5 mm. The mass fraction of the anti-bursting component is 8% of the mass fraction of the cementing material.
This embodiment is used:
the method comprises the following steps: 70 percent of quicklime and 30 percent of light-burned magnesia are prepared into a mixed material;
step two: crushing the mixed materials in a jaw crusher, and grinding in a ball mill to prepare a cementing material with the fineness less than 325 meshes and uniform components;
step three: mixing paper pulp dry powder accounting for 12% of the mass fraction of the cementing material with a proper amount of transmitter water in a container to prepare turbid liquid with glass fibers uniformly distributed in the transmitter water;
step four: adding powdery cementing materials into a spherical disk type pelletizer according to 2.5 percent of the mass part of the iron concentrate powder; and simultaneously spraying a proper amount of turbid liquid into a ball disk type pelletizer, mixing iron ore concentrate powder, a cementing material of an alkaline binder and an anti-explosion component together in the ball disk type pelletizer, homogenizing and rolling into wet ore balls.
Magnetite concentrate is usually made into a dense wet pellet with a transmitter agent water together with a binder, which shrinks during drying, under the condition of temperature difference and humidity difference between the inside and the outside of the wet ball, when the transmitter agent water is evaporated and dried between the dried shell and the wet core, if the drying shrinkage causes insufficient steam channels (or the moisture in the wet core evaporates too fast), the water vapor in the wet core causes bursting phenomenon in the drying and hair increasing process, in this embodiment, the dry pulp powder is uniformly dispersed in the transmitter water as the anti-bursting component, the fiber of the pulp is filled in the compact wet ball, the wet ball is carbonized or burned in the dry burning process, a steam channel is left, the defect that the steam channel is insufficient due to drying shrinkage caused by only using quicklime, light-burned magnesium oxide and other cementitious materials is overcome, the high-temperature bursting strength of the wet ball in the embodiment is 786 ℃, and the phenomenon that the shaft furnace production is unsmooth due to the fact that high-temperature bursting does not occur in the embodiment is actually measured.
The moisture of the wet ore balls in the embodiment is measured to be 13.6%, the falling (0.5 m) strength is more than 10 times, the compression strength of the wet ore balls is more than 22N/ball, the high-temperature bursting strength of the wet ore balls in the embodiment is 808 ℃, and the high-temperature bursting phenomenon does not occur when the wet ore balls in the embodiment are dried and fired in shaft furnace equipment.
The invention overcomes the defects that the bentonite is adopted as the green pellet binder for the pellet (such as consumption of bentonite resources and increase of blast furnace slag content), compared with the bentonite, the main components (such as CaO and MgO) of the invention are useful and beneficial for blast furnace slagging, the fibrous anti-explosion component can avoid the occurrence of the burst phenomenon of the pellet in the drying and roasting processes, the invention avoids the technical difficulty of uniformly mixing the fibrous component and the powdery cementing material, the anti-explosion component is mixed with the transmitter water necessary for the iron concentrate powder pelletizing, and the invention has the advantages of simple and easy uniform mixing and dispersion.
Claims (2)
1. The binder for the complex-phase pellet mine is characterized by comprising the following components in parts by weight: the binder for the complex phase pellet mine consists of powdery cementing materials and anti-cracking components; quick lime, light-burned dolomite lime and light-burned magnesium oxide for cementing materialOne or more than one raw materials are mixed and homogenized to prepare the binding material, the total content of CaO and MgO in the binding material is not less than 65 percent, and Al is added2O3The content is not more than 3.0 percent, and the powder fineness of the cementing material is less than 0.045 mm; the anti-bursting component is a fibrous material, the mass fraction of the anti-bursting component is not more than 20% of the mass fraction of the cementing material, the fineness of the fibrous material is not more than 20 mu m, the length of the fibrous material is not more than 25mm, and the fibrous material is one or more of pulp powder, plant fiber and glass fiber.
2. The method for using the binder for the complex phase pellet mine as claimed in claim 1, wherein the binder comprises the following components:
the method comprises the following steps: preparing one or more than one raw material of quick lime, light-burned dolomite lime and light-burned magnesium oxide in the cementing material into a mixed material according to a proper proportion;
step two: crushing and grinding the mixed materials to prepare a cementing material with the fineness less than 0.045mm and uniform components;
step three: mixing an anti-bursting component with the mass fraction of the cementing material being not more than 20% with a proper amount of transmitter water to prepare a suspension of fibrous materials in the anti-bursting component uniformly distributed in the transmitter water;
step four: adding the gelled material into a pelletizer, spraying a proper amount of turbid liquid into the pelletizer, rolling, mixing, homogenizing and pelletizing the gelled material, the anti-explosion component and the transmitter water together with the bonded materials in a pellet pelletizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011069713.5A CN112126781A (en) | 2020-10-09 | 2020-10-09 | Complex phase pellet mining binder and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011069713.5A CN112126781A (en) | 2020-10-09 | 2020-10-09 | Complex phase pellet mining binder and use method thereof |
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| CN112126781A true CN112126781A (en) | 2020-12-25 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1543566A (en) * | 1975-02-14 | 1979-04-04 | Charcon Prod Ltd | Consolidation of particulate materials |
| CN105385848A (en) * | 2015-11-10 | 2016-03-09 | 湖南华菱湘潭钢铁有限公司 | Preparation method of iron ore powder pelletized magnesian binding agent |
| CN105861818A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Efficient composite bentonite for pellets |
| CN107345273A (en) * | 2017-07-18 | 2017-11-14 | 鞍钢集团矿业有限公司 | Magnesium-based pellet organic binder bond and its preparation and application |
| CN107723465A (en) * | 2017-09-28 | 2018-02-23 | 毕德玉 | A kind of compound method of pelletizing binding agent containing magnesium |
| CN110894575A (en) * | 2019-11-13 | 2020-03-20 | 鞍钢集团矿业有限公司 | Composite binder for low-alkalinity magnesium pellets and preparation method and application thereof |
-
2020
- 2020-10-09 CN CN202011069713.5A patent/CN112126781A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1543566A (en) * | 1975-02-14 | 1979-04-04 | Charcon Prod Ltd | Consolidation of particulate materials |
| CN105861818A (en) * | 2015-01-23 | 2016-08-17 | 鞍钢股份有限公司 | Efficient composite bentonite for pellets |
| CN105385848A (en) * | 2015-11-10 | 2016-03-09 | 湖南华菱湘潭钢铁有限公司 | Preparation method of iron ore powder pelletized magnesian binding agent |
| CN107345273A (en) * | 2017-07-18 | 2017-11-14 | 鞍钢集团矿业有限公司 | Magnesium-based pellet organic binder bond and its preparation and application |
| CN107723465A (en) * | 2017-09-28 | 2018-02-23 | 毕德玉 | A kind of compound method of pelletizing binding agent containing magnesium |
| CN110894575A (en) * | 2019-11-13 | 2020-03-20 | 鞍钢集团矿业有限公司 | Composite binder for low-alkalinity magnesium pellets and preparation method and application thereof |
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