CN108097428B - Preparation method of fine vanadium slag for recovering metallic iron - Google Patents
Preparation method of fine vanadium slag for recovering metallic iron Download PDFInfo
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- CN108097428B CN108097428B CN201711287328.6A CN201711287328A CN108097428B CN 108097428 B CN108097428 B CN 108097428B CN 201711287328 A CN201711287328 A CN 201711287328A CN 108097428 B CN108097428 B CN 108097428B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
Abstract
The invention relates to a preparation method of fine vanadium slag for recovering metallic iron, which is characterized by at least comprising the following steps of: grinding and screening vanadium slag raw materials with the particle size of 10-40 mm to obtain iron-containing materials I which do not pass through a screen and powdery materials which pass through the screen; winnowing the obtained powdery material to obtain fine vanadium slag A and coarse slag; and finely screening the obtained coarse slag to obtain fine vanadium slag B and an iron-containing material II. The method comprehensively adopts the grinding, screening, winnowing and fine screening processes, has simple operation flow, short production period and high efficiency, can recover the metallic iron in the vanadium slag to the maximum extent, reduces the content of the iron in the fine vanadium slag and improves the yield of the fine vanadium slag.
Description
Technical Field
The invention relates to the technical field of fine vanadium slag preparation, in particular to a preparation method of fine vanadium slag for recovering metal iron.
Background
In the hydrometallurgical vanadium extraction process, the blocky materials extracted by the converter need to be made into powdery materials through the working procedures of magnetic disc hanging smashing, crushing, grinding and the like, and then the powdery materials are made into fine vanadium slag, and the fine vanadium slag has the granularity meeting the process requirements, wherein the mass percentage content of metallic iron needs to be lower than 3 percent so as to ensure the roasting forward reaction. However, the ball mill adopted in the grinding process in the prior art has the problems of low grinding efficiency and high energy consumption, the grinding system has a complex process and low iron removal efficiency, and a double-roller magnetic separator used in the process is very easy to magnetize weak magnetic vanadium slag during operation, so that the vanadium content of a dispersed iron belt reaches more than 11%, the vanadium is wasted, and the return treatment of the dispersed iron is difficult. Meanwhile, the sieve pore structures of the screening equipment adopted in the prior art are all long-strip holes or square holes, and dispersed iron easily permeates through the sieve, so that the fine vanadium slag has high iron content, the thermal regulation of the rotary kiln is influenced finally, and the vanadium yield of the system is reduced.
Disclosure of Invention
Aiming at the technical problems of long production period, low efficiency and low product yield in the prior art, the invention provides a preparation method of fine vanadium slag for recovering metallic iron.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a method for preparing fine vanadium slag for recovering metallic iron, characterized by comprising at least the steps of:
step 1, grinding and screening a vanadium slag raw material with the granularity of 10-40 mm to obtain an iron-containing material I which does not pass through a screen and a powdery material which passes through the screen; the grinding adopts a two-section ball mill, a first section bin of the two-section ball mill is used for ball milling, a second section bin of the two-section ball mill is used for rod milling, a compartment grate plate is arranged between the first section bin and the second section bin, and a discharge grate plate is arranged at an outlet of the second section bin; the grate bar edges and corners of the bin-separating grate plate and the discharging grate plate are both R4mm-R8mm round chamfer structures, the material passing holes of the bin-separating grate plate and the discharging grate plate are in horn shapes of 8-18 degrees from a material inlet to a material outlet, the aperture of the bin-separating grate plate is 13-26 mm, and the aperture of the discharging grate plate is 10-23 mm; the screening device is a cylindrical screen, the diameter of each screen hole is 2-6 mm, the screen holes on the screen plate of the cylindrical screen are arranged in a staggered mode, and the screen plate is horn-shaped from the feeding side to the discharging side;
step 2, winnowing the powdery material obtained in the step 1 to obtain fine vanadium slag A without iron and coarse slag containing iron;
and 3, screening the coarse slag obtained in the step 2 to obtain fine vanadium slag B with the iron content less than or equal to 2% and an iron-containing material II with the vanadium content less than or equal to 1%.
Compared with the prior art, the method comprehensively adopts the grinding, screening, winnowing and fine screening processes, has simple operation flow, short production period and high efficiency, can recover the metallic iron in the vanadium slag to the maximum extent, reduces the content of the iron in the fine vanadium slag and improves the yield of the fine vanadium slag.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a preparation method of fine vanadium slag for recovering metallic iron, which is characterized by at least comprising the following steps:
step 1, grinding and screening a vanadium slag raw material with the granularity of 10-40 mm to obtain an iron-containing material I which does not pass through a screen and a powdery material which passes through the screen;
step 2, winnowing the powdery material obtained in the step 1 to obtain fine vanadium slag A without iron and coarse slag containing iron;
and 3, finely screening the coarse slag obtained in the step 2 to obtain fine vanadium slag B with the iron content less than or equal to 2% and an iron-containing material II with the vanadium content less than or equal to 1%.
Compared with the prior art, the method comprehensively adopts the grinding, screening, winnowing and fine screening processes, has simple operation flow, short production period and high efficiency, can recover the metallic iron in the vanadium slag to the maximum extent, reduces the content of the iron in the fine vanadium slag and improves the yield of the fine vanadium slag.
Specifically, in the step 1, the grinding adopts a two-section ball mill, a first section bin of the two-section ball mill is used for ball milling, a second section bin of the two-section ball mill is used for rod milling, a compartment grate plate is arranged between the first section bin and the second section bin, and a discharge grate plate is arranged at an outlet of the second section bin. The ball milling of one section of bin is a rough grinding bin, after the vanadium slag is subjected to rough grinding, the material with larger particle size is primarily ground, and bean iron (namely the iron-containing material I) and dispersed iron (namely the iron-containing material II) in the vanadium slag are exposed. The two-stage bin rod mill is the fine grinding bin, and the material through preliminary crushing is further smashed, makes bean iron and dispersion iron fully expose and separate with the vanadium slag, and bean iron can not smashed once more because hardness is higher, can not pass through the screen cloth during the screening to with the iron content material separately with the meticulous vanadium slag that does not contain iron or iron content is showing the reduction when doing benefit to follow-up screening, selection by winnowing. The compartment grate plate can play a role in separating the fineness of the ground materials, after the materials are coarsely ground in a first compartment, the materials with the smaller particle size enter a second compartment for fine grinding after passing through the compartment grate plate, and the materials with the larger particle size are intercepted in the first compartment and continuously ground until the particle size is reduced to the accessible compartment grate plate. And discharging the finely ground material out of the ball mill through a discharge grate plate to obtain the material which exposes the iron-containing material from the vanadium slag. The two-section ball mill is adopted, so that the influence of the ground fine materials on the grinding process of the unground coarse materials can be avoided, and the efficiency of grinding the materials is improved.
Preferably, the grid rib edges of the bin-separating grid plate and the discharging grid plate are both of round chamfer structures of R4mm-R8mm, the material passing holes of the bin-separating grid plate and the discharging grid plate are in horn shapes of 8-18 degrees from the material inlet to the material outlet, the aperture of the bin-separating grid plate is 13-26 mm, and the aperture of the discharging grid plate is 10-23 mm. When the optimized grate plate is used, the arc-shaped structure of the material passing hole is consistent with the moving direction of the material, the material passing hole is in a horn shape in the axial moving direction of the material, the material is smoothly discharged, impurities which cannot be crushed in the grinding process can be returned to a section of bin when encountering the grate plate, and the material passing hole of the grate plate cannot be blocked. The optimized aperture of the grate plate can effectively separate coarse materials with larger particle size from fine materials with reduced particle size, the working efficiency of grinding the materials is improved, and the materials with smaller particle size are finally obtained.
Preferably, the two-section ball mill is characterized in that the bin-separating grate plate and the discharging grate plate are made of wear-resistant manganese steel. The manganese steel has high strength and is not easy to damage, the service life of the grate plate is prolonged, and the width of the material passing hole is kept constant in the service life cycle of the grate plate, so that the product granularity can not increase along with the abrasion of the grate plate.
Preferably, the screening device is a cylindrical screen, and the diameter of a screen hole is 2-6 mm. The drum sieve with the preferred aperture is used for screening the materials after ball milling and crushing, the iron-containing material I which can not pass through the screen mesh and the powdery material with smaller particle size which can pass through the screen mesh are separated, the vanadium content in the obtained iron-containing material I is low, the waste of vanadium can be reduced, and the iron can be returned to the furnace. And the optimized sieve pore diameter is easier to keep constant in the service life cycle of the cylindrical sieve, thereby ensuring the stable sieving effect.
Preferably, the screen holes on the screen plate of the cylindrical screen are arranged in a staggered manner and form a micro-trumpet shape from the feeding side to the discharging side. The staggered sieve pores can increase the effective sieving area, so that the discharge is smooth, and the sieving efficiency is higher; the micro-trumpet-shaped sieve pores are not easy to block, the strength is high, and the service life is long.
The winnowing device in the step 2 is a high-efficiency rotor powder concentrator, and the air volume is as follows: 4.5-9.5 ten thousand meters3H, wind pressure: 1400-2400 Pa. High-efficient rotor selection powder machine is used for sorting powdered material once more, under preferred amount of wind and wind pressure condition, can high-efficiently the ground wind elect the meticulous vanadium sediment A that does not contain iron and the coarse sediment of iron content, and amount of wind, wind-force undersize then inefficiency, the effect is poor, and partial meticulous vanadium sediment can't be selected by the selection by winnowing, but amount of wind, wind-force when too big, then can make partial coarse sediment be sneaked into in the meticulous vanadium sediment, influence selection by winnowing effect equally. The obtained fine vanadium slag does not contain iron and can be used as a fine raw material for extracting vanadium oxide by sodium oxide roasting or a sub-molten salt method.
The screening device in the step 3 is a double-layer cylindrical screen. The bilateral cylindrical screens can finely screen materials through different screen mesh apertures, and separate fine vanadium slag B with the iron content of less than or equal to 2% and iron-containing material II with the vanadium content of less than or equal to 1%, so that the screening efficiency is high, and the screening effect on the material granularity is good.
Preferably, the inner screen mesh of the double-layer cylindrical screen is 20-40 meshes, and the outer screen mesh of the double-layer cylindrical screen is 40-60 meshes. By using the optimized screen mesh aperture, the fine vanadium slag B with the iron content less than or equal to 2 percent and the iron-containing material II with the vanadium content less than or equal to 1 percent can be obtained, wherein the iron content in the fine vanadium slag B is low, the fine vanadium slag B can also be used as a fine raw material for extracting vanadium oxide by sodium oxide roasting or a sub-molten salt method, the iron-containing material II has low vanadium content, the waste of vanadium is reduced, and the iron-returning treatment is facilitated.
Further preferably, the preparation method of the fine vanadium slag for recovering metallic iron is characterized in that the double-layer cylindrical screen mesh is made of 304 stainless steel. The stainless steel material has fewer impurities and more stable property, and other impurities are prevented from being brought into the material when the material is screened.
In order to better illustrate the embodiments of the present invention, the following examples are further illustrative.
Example 1
The embodiment of the invention provides a preparation method of fine vanadium slag for recovering metallic iron, wherein a separation bin grate plate and a discharge grate plate are both non-clogging high-efficiency grate plates manufactured by Chengde division of river steel group Limited company, the edge angles of the grate plates are all round chamfer angles of R4mm, a material passing hole is in a horn shape with an angle of 8 degrees from a material inlet to a material outlet, the aperture of the separation bin grate plate is 13mm, and the aperture of the discharge grate plate is 10 mm; the cylindrical screen is a cylindrical screen manufactured by Chengde division of the company Limited in river Steel group, and the diameter of the screen hole is 2 mm.
The preparation process comprises the following steps:
step 1, grinding the vanadium slag raw material with granularity smaller than 40mm and arbitrary MFe content, and detecting that the mass of the material which can pass through a 120-mesh sieve in the ground material accounts for 82% of the total mass of the material. Screening the obtained material by using a cylindrical screen with the screen hole diameter of 2mm to obtain an iron-containing material I and a powdery material;
step 2, winnowing the powdery material obtained in the step 1 by using a high-efficiency rotor powder concentrator, wherein the air quantity is 4.5 ten thousand meters3The air pressure is 1400Pa, and the fine vanadium slag A obtained by detection does not contain MFe, and the coarse slag contains MFe;
and 3, finely screening the coarse slag obtained in the step 2 by using a double-layer cylindrical screen with an inner screen mesh of 20 meshes and an outer screen mesh of 40 meshes, and detecting that the MFe content in the fine vanadium slag B obtained by screening is 1.2%, and the vanadium slag content in the iron-containing material II is 0.8%.
Example 2
The embodiment of the invention provides a preparation method of fine vanadium slag for recovering metallic iron, wherein a separation bin grate plate and a discharge grate plate are both non-clogging high-efficiency grate plates manufactured by Chengde division of river steel group Limited company, the edge angles of the grate plates are all round chamfer angles of R6mm, a material passing hole is in a horn shape with 12 degrees from a material inlet to a material outlet, the aperture of the separation bin grate plate is 20mm, and the aperture of the discharge grate plate is 17 mm; the cylindrical screen is a cylindrical screen manufactured by Chengde division of the company Limited in river Steel group, and the diameter of the screen hole is 4 mm.
The preparation process comprises the following steps:
step 1, grinding the vanadium slag raw material with granularity smaller than 40mm and arbitrary MFe content, and detecting that the mass of the material which can pass through a 120-mesh sieve in the ground material accounts for 86% of the total mass of the material. Screening the obtained material by using a cylindrical screen with the screen hole diameter of 6mm to obtain an iron-containing material I and a powdery material;
step 2, winnowing the powdery material obtained in the step 1 by using a high-efficiency rotor powder concentrator, wherein the air quantity is 7 ten thousand meters3The air pressure is 1700Pa, and the fine vanadium slag A obtained through detection does not contain MFe, and the coarse slag contains MFe;
and 3, finely screening the coarse slag obtained in the step 2 by using a double-layer cylindrical screen with an inner screen mesh of 24 meshes and an outer screen mesh of 50 meshes, and detecting that the MFe content in the fine vanadium slag B obtained by screening is 1.4% and the vanadium slag content in the iron-containing material II is 0.6%.
Example 3
The embodiment of the invention provides a preparation method of fine vanadium slag for recovering metallic iron, wherein a compartment grate plate and a discharge grate plate are both non-clogging high-efficiency grate plates manufactured by Chengde division of river steel group Limited company, the edge angles of the grate plates are all round chamfer angles of R8mm, a material passing hole is in a horn shape with 18 degrees from a material inlet to a material outlet, the aperture of the compartment grate plate is 26mm, and the aperture of the discharge grate plate is 23 mm; the cylindrical screen is a cylindrical screen manufactured by Chengde division of the company Limited in river Steel group, and the diameter of the screen hole is 6 mm.
The preparation process comprises the following steps:
step 1, grinding the vanadium slag raw material with granularity smaller than 40mm and arbitrary MFe content, and detecting that the mass of the material which can pass through a 120-mesh sieve in the ground material accounts for 85% of the total mass of the material. Screening the obtained material by using a cylindrical screen with the diameter of a screen hole of 4mm to obtain an iron-containing material I and a powdery material;
step 2, winnowing the powdery material obtained in the step 1 by using a high-efficiency rotor powder concentrator, wherein the air quantity is 9.5 ten thousand meters3The air pressure is 2400Pa, and the fine vanadium slag A obtained through detection does not contain MFe, and the coarse slag contains MFe;
and 3, finely screening the coarse slag obtained in the step 2 by using a double-layer cylindrical screen with an inner screen mesh of 40 meshes and an outer screen mesh of 60 meshes, and detecting that the MFe content in the fine vanadium slag B obtained by screening is 1.1%, and the vanadium slag content in the iron-containing material II is 0.4%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for preparing fine vanadium slag for recovering metallic iron, characterized by comprising at least the steps of:
step 1, grinding and screening a vanadium slag raw material with the granularity of 10-40 mm to obtain an iron-containing material I which does not pass through a screen and a powdery material which passes through the screen; the grinding adopts a two-section ball mill, a first section bin of the two-section ball mill is used for ball milling, a second section bin of the two-section ball mill is used for rod milling, a compartment grate plate is arranged between the first section bin and the second section bin, and a discharge grate plate is arranged at an outlet of the second section bin; the grate bar edges and corners of the bin-separating grate plate and the discharging grate plate are both R4mm-R8mm round chamfer structures, the material passing holes of the bin-separating grate plate and the discharging grate plate are in horn shapes of 8-18 degrees from a material inlet to a material outlet, the aperture of the bin-separating grate plate is 13-26 mm, and the aperture of the discharging grate plate is 10-23 mm; the screening device is a cylindrical screen, the diameter of each screen hole is 2-6 mm, the screen holes on the screen plate of the cylindrical screen are arranged in a staggered mode, and the screen plate is horn-shaped from the feeding side to the discharging side;
step 2, winnowing the powdery material obtained in the step 1 to obtain fine vanadium slag A without iron and coarse slag containing iron;
and 3, screening the coarse slag obtained in the step 2 to obtain fine vanadium slag B with the iron content less than or equal to 2% and an iron-containing material II with the vanadium content less than or equal to 1%.
2. The method for preparing fine vanadium slag for recovering metallic iron according to claim 1, wherein the partition grate plate and the discharge grate plate in the two-stage ball mill are made of wear-resistant manganese steel.
3. The method for preparing fine vanadium slag for recovering metallic iron as claimed in claim 1, wherein the air separation means in the step 2 is a rotor powder concentrator having an air volume of 4.5 to 9.5 ten thousand m3The wind pressure is 1400-2400 Pa.
4. The method for preparing fine vanadium slag for recovering metallic iron according to claim 1, wherein the sieving means in the step 3 is a double-layered cylindrical sieve.
5. The method for preparing the fine vanadium slag for recovering metallic iron according to claim 4, wherein the inner mesh of the double-layered cylindrical screen is 20 to 40 mesh, and the outer mesh of the double-layered cylindrical screen is 40 to 60 mesh.
6. The method for preparing fine vanadium slag for recovering metallic iron according to claim 4, wherein the double-layered cylindrical screen mesh is made of 304 stainless steel.
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| CN112718133B (en) * | 2020-12-17 | 2022-06-21 | 中信锦州金属股份有限公司 | Method and device for improving granularity of high-chromium low-iron vanadium fine slag |
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| CN1067834A (en) * | 1991-06-22 | 1993-01-13 | 阳泉市郊区矿渣建材厂 | Selection by winnowing reclaims the method for metal in the dreg |
| CN2192382Y (en) * | 1994-03-24 | 1995-03-22 | 孔庆山 | Whirlwind choosen powder type tube mill with efficient and energy-saving |
| WO2014021473A1 (en) * | 2012-08-03 | 2014-02-06 | 株式会社神戸製鋼所 | Method for producing metallic iron |
| CN103555867B (en) * | 2013-10-31 | 2016-03-02 | 中冶南方工程技术有限公司 | A kind of slag is converted into system and the method thereof of renewable resource |
| CN104475214A (en) * | 2014-11-13 | 2015-04-01 | 攀枝花钢城集团米易瑞地矿业有限公司 | Weathered ore-containing vanadium titano-magnetite pre-dressing technology |
| DE102015006152B4 (en) * | 2015-05-12 | 2018-06-07 | Mueg Mitteldeutsche Umwelt Und Entsorgung Gmbh | Process for the preparation and reuse of foundry sands |
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