CN114226044A - Steel slag iron removal process - Google Patents

Steel slag iron removal process Download PDF

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Publication number
CN114226044A
CN114226044A CN202111363351.5A CN202111363351A CN114226044A CN 114226044 A CN114226044 A CN 114226044A CN 202111363351 A CN202111363351 A CN 202111363351A CN 114226044 A CN114226044 A CN 114226044A
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CN
China
Prior art keywords
steel slag
iron
magnetic separator
conveying
station
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CN202111363351.5A
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Chinese (zh)
Inventor
谭箭
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Hunan Xingang Industrial Co ltd
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Hunan Xingang Industrial Co ltd
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Priority to CN202111363351.5A priority Critical patent/CN114226044A/en
Publication of CN114226044A publication Critical patent/CN114226044A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/10Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09BDISPOSAL OF SOLID WASTE
    • B09B3/00Destroying solid waste or transforming solid waste into something useful or harmless

Abstract

The invention relates to a steel slag iron removal process, which comprises the following steps: (1) conveying the steel slag to a crushing station after the iron of the steel slag is removed primarily; (2) crushing the steel slag by a crusher; (3) conveying the crushed steel slag to a primary magnetic separator for magnetic separation of iron powder particles, and feeding the steel slag subjected to the primary magnetic separation into a screening station; (4) conveying the steel slag with the particle size of less than 30mm into a grinding station after screening, and conveying the steel slag with the particle size of more than 30mm to a crushing station for crushing again; (5) conveying the ground materials to a secondary magnetic separator; (6) secondary magnetic separation: conveying the steel slag subjected to secondary magnetic separation to a screening station, returning the material with the particle size of more than 5mm after screening to an abrasive station for regrinding, and taking the steel slag tailings with the particle size of less than 5mm after iron removal. The product after iron removal screening has uniform granularity, less over-crushed slag, over 65 percent of the selected steel taste iron concentrate powder, and no more than 0.5 percent of the magnetic iron content of the tailings, and meets the use requirements of re-sintering and processing micro powder for building materials.

Description

Steel slag iron removal process
Technical Field
The invention belongs to the technical field of treatment of steelmaking wastes, and particularly relates to a steel slag iron removal process.
Background
The steel slag is a main solid waste in the steel-making link, and 1.2 million tons of steel-making steel slag are produced in the year according to 8 million tons of national steel production capacity. But the domestic steel slag treatment process is simple and extensive; generally, after hot stuffiness, temperature reduction and decomposition, selecting large-diameter scrap steel and magnetic separation powder; the remaining tailings are more than 20mm, and account for more than 80% of the total treatment amount. Because the iron powder is not broken fully, the iron powder still contains about 4 percent of simple substance iron, and the content of the iron powder is even more than 5 percent. Moreover, the remained tailings have the serious problems of iron-coated slag and iron slag solidification; because of the restriction of the domestic technical level, the part of tailings cannot create economic value after being continuously processed, the cost bottleneck of the prior art is reached, and the tailings become the chicken ribs.
The equipment adopted by the traditional dry processing technology is as follows: jaw breaking, hammer breaking, iron removal on a belt, a magnetic separator and the like, wherein the content of particle steel is lower than 40 percent, which is not beneficial to steel making, and the content of iron in tailings is about 6 percent, which is not beneficial to recycling. The wet separation method of the water mill occupies more area, has high small particle size and high taste, is not suitable for processing the large steel slag and recycling the tailings, the large steel slag needs to be matched with other rough separation methods, and the tailings need to be concentrated: the method has the advantages that the method can be utilized only by precipitation, squeezing, dehydration and drying, the environment is polluted and is not environment-friendly, the water is separated by an inclined plate precipitator, a squeezer and a matched water tank, and after fine grinding slurry and water magnetic separation, the activity of tailings is lost, so that the method cannot be used for producing the steel slag powder.
The prior art solutions have many problems, as follows: the recovery rate of the selected iron is low, the residual iron is higher, the utilization of the tailings can not meet the requirement, and the reprocessing cost is high. High maintenance cost and high loss of parts of the equipment (such as hammer head lining plates, steel bars and the like). At present, after the tailings of the iron removal process of steel slag are ground into powder, the iron content is high, but the tailings have certain expansibility, and cracking and slurry turning are difficult problems, so that a steel slag treatment method and a steel slag treatment process need to be enhanced and improved, the steel slag is thoroughly stripped through a steel slag rod mill, an iron selection process needs to be improved, and steel-making and iron-making raw materials are magnetically selected. The water separation has environmental pollution and the dry separation has large dust. The purpose of the steel slag treatment is to dissociate as much as possible, separate metal from slag in the steel slag, reduce free calcium oxide in the steel slag, remove instability in the steel slag, recover metal tailings in the steel slag as much as possible, and improve comprehensive reutilization of the tailings by about 0.5%.
In conclusion, it is highly desirable to provide a slag iron removal process that maximizes the comprehensive utilization of steel slag.
Disclosure of Invention
The invention aims to provide a slag iron removal process capable of maximizing the comprehensive utilization value of steel slag.
The above purpose is realized by the following technical scheme: a steel slag iron removal process comprises the following steps:
(1) transferring the steel slag to a material flattening conveying belt, wherein a material flattening machine used for controlling the thickness of a material layer is arranged on the material flattening conveying belt, and conveying the steel slag to a crushing station after preliminary iron particle removal is carried out on the material flattening conveying belt;
(2) crushing the steel slag by a crusher;
(3) conveying the crushed steel slag to a primary magnetic separator for magnetic separation of iron powder particles, and feeding the steel slag subjected to the primary magnetic separation into a screening station;
(4) conveying the steel slag with the particle size of less than 30mm into a grinding station after screening, and conveying the steel slag with the particle size of more than 30mm to a crushing station for crushing again;
(5) discharging the ground material from the discharge end, conveying the material to a secondary magnetic separator;
(6) secondary magnetic separation: conveying the steel slag subjected to secondary magnetic separation to a screening station, returning the material with the particle size of more than 5mm after screening to an abrasive station for regrinding, and taking the steel slag tailings with the particle size of less than 5mm after iron removal.
In the practical application process of the invention, the steel slag is discharged onto the material leveling conveying belt through the vibration feeder through the raw material bin, the material leveling conveying belt is provided with a material leveling machine for controlling the material layer thickness, the optimal material layer thickness is adjusted, and meanwhile, under the condition that the conveying amount is not changed, the belt width can be widened, and the magnetic separation surface is ensured to be enlarged compared with the normal magnetic separation surface. After crushing, ensuring that the granularity of the primary magnetic separation feed material is moderate, after the primary magnetic separation, feeding the steel slag with the granularity of less than 30mm into a screening station for screening, feeding the steel slag with the granularity of more than 30mm into an abrasive station, and conveying the steel slag to a crushing station for crushing again; the ground materials are discharged from a discharge end, conveyed and sent to a secondary magnetic separator through steel slag, particle steel and iron powder are recovered, then screening is carried out, the materials with the particle size of more than 5mm after screening are returned to a grinding material station for grinding, the materials with the particle size of less than 5mm are steel slag tailings after iron removal, the grade refined iron powder of the steel is selected to be more than 65%, the magnetic iron content of the tailings is not more than 0.5%, and the use requirement of re-sintering is met.
A further technical scheme is that the first-stage magnetic separator and the second-stage magnetic separator at least comprise two separation rollers, the separation rollers are arranged up and down, the horizontal interval between the adjacent separation rollers is a preset distance, and a movable material distribution plate is arranged between the adjacent separation rollers. So set up, change the perpendicular whereabouts mode of material in the magnet separator, adjust to the notch cuttype unloading, increase the magnetic separation probability, improve the magnetic separation effect.
The further technical scheme is that at least the secondary magnetic separator comprises three separation rollers, and the uppermost separation roller and the lowermost separation roller are positioned on the same side of the middle separation roller. So set up, the material is "Z" style of calligraphy unloading in the magnet separator and carries out the magnetic separation, improves the magnetic separation rate.
The further technical scheme is that a special steel slag cone crusher is adopted for crushing in the step (2). Preferably hydraulic conical crushing, so that the feed granularity is moderate, the discharge granularity is adjustable, and the discharge is uniform.
The further technical scheme is that the grinding material station in the step (5) is crushed by a special steel slag rod mill, and the water content of the steel slag entering the rod mill is less than 12%. Under the condition, the materials are crushed, ground and stripped, the effect is obvious, and the later magnetic separation effect is favorably improved.
The further technical scheme is that the particle size of the material entering the cone crusher in the step (2) is less than 120 mm.
The further technical scheme is that the magnetic rollers of the first-stage magnetic separator and the second-stage magnetic separator are detachably combined, and each magnetic roller is matched with a motor through a cycloidal pin gear speed reducer. Therefore, the magnetic separator can operate in a controllable range in the whole process, and the magnetic separation effect is ensured.
And (3) further adopting the technical scheme that the steel slag subjected to grinding in the step (5) sequentially passes through a material stabilizing bin and a vibrating feeder and then enters the secondary magnetic separator, and the material stabilizing bin is connected with a feeding port of the secondary magnetic separator through the vibrating feeder.
The further technical scheme is that the steel slag after the primary magnetic separation in the step (4) sequentially passes through a material stabilizing bin and a vibrating feeder and then enters a rod mill.
The further technical scheme is that the first-stage magnetic separator is a closed stepped double-roller magnetic separator, and the second-stage magnetic separator is a special magnetic separator for washing along the washing direction.
The invention realizes the complete separation of slag and steel through the control and the comprehensive control of the feeding amount, the product granularity is more uniform, the over-crushed slag is less, the granularity is controlled to be less than or equal to 5mm, the dry-type magnetic separator with the variable rotating speed with a special structure is prepared, the whole process of the magnetic separator is operated in a controllable range, the taste iron powder of the selected steel is more than 65 percent, the magnetic iron content of the tailings is not more than 0.5 percent, and the use requirement of the re-sintering is met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a steel slag deferrization process according to an embodiment of the present invention;
FIGS. 2 and 3 are schematic cross-sectional views of a magnetic separator according to an embodiment of the present invention.
In the figure:
1 material leveling conveying belt 2 raw material bin 3 vibrating feeder 4 material leveling machine
5 first-stage magnetic separator, 6 second-stage magnetic separator, 7 cone crusher and 8 rod mill
9 steady feed bin 10 shale shaker 11 sorting cylinder 12 activity divides flitch
13 hanging iron remover
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.
The embodiment of the invention is as follows, referring to fig. 1, the iron removing process for the steel slag comprises the following steps:
(1) the method comprises the following steps of (1) transferring steel slag to a leveling conveyor belt 1, wherein a leveling machine 4 for controlling the thickness of a material layer is arranged on the leveling conveyor belt 1, and after a hanging iron remover 13 of the leveling conveyor belt 1 carries out primary iron particle removal, conveying the steel slag to a crushing station;
(2) crushing the steel slag by a crusher;
(3) conveying the crushed steel slag to a primary magnetic separator 5 for magnetic separation of iron powder particles, and conveying the steel slag subjected to the primary magnetic separation to a screening station;
(4) conveying the steel slag with the particle size of less than 30mm into a grinding station after screening, and conveying the steel slag with the particle size of more than 30mm to a crushing station for crushing again;
(5) the ground material is discharged from the discharge end, conveyed and sent to a secondary magnetic separator 6;
(6) secondary magnetic separation: conveying the steel slag subjected to secondary magnetic separation to a screening station, returning the material with the particle size of more than 5mm after screening to an abrasive station for regrinding, and taking the steel slag tailings with the particle size of less than 5mm after iron removal.
In the practical application process of the invention, the steel slag is discharged onto the leveling conveying belt 1 through the raw material bin 2 and the vibrating feeder 3, the leveling conveying belt 1 is provided with the leveling machine 4 for controlling the material layer thickness, the optimal material layer thickness is adjusted, meanwhile, under the condition that the conveying amount is not changed, the belt width can be widened, and the magnetic separation surface is ensured to be enlarged compared with the normal magnetic separation surface. After crushing, ensuring that the granularity of the primary magnetic separation feed material is moderate, after the primary magnetic separation, screening the steel slag by a vibrating screen 10 of a screening station, sending the steel slag with the granularity of less than 30mm to an abrasive station, and conveying the steel slag with the granularity of more than 30mm to a crushing station for crushing again; the ground materials are discharged from a discharge end, conveyed and sent to a secondary magnetic separator 6 through steel slag, particle steel and iron powder are recovered, then screening is carried out, the materials with the particle size of more than 5mm after screening are returned to a grinding material station for grinding, the materials with the particle size of less than 5mm are steel slag tailings after iron removal, the grade refined iron powder of the steel is selected to be more than 65%, the magnetic iron content of the tailings is not more than 0.5%, and the use requirement of re-sintering is met.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 2 and fig. 3, each of the primary magnetic separator 5 and the secondary magnetic separator 6 includes at least two sorting rollers 11, the sorting rollers 11 are arranged up and down, the adjacent sorting rollers 11 are horizontally spaced by a predetermined distance, and a movable material distributing plate 12 is arranged between the adjacent sorting rollers 11. So set up, change the perpendicular whereabouts mode of material in the magnet separator, adjust to the notch cuttype unloading, increase the magnetic separation probability, improve the magnetic separation effect.
In another embodiment of the present invention based on the above embodiment, as shown in FIG. 3, at least the secondary magnetic separator 5 comprises three sorting drums 11, with the uppermost sorting drum 11 and the lowermost sorting drum 11 being located on the same side of the intermediate sorting drum 11. So set up, the material is "Z" style of calligraphy unloading in the magnet separator and carries out the magnetic separation, improves the magnetic separation rate.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a special steel slag cone crusher 7 is used for crushing in the step (2). Preferably hydraulic conical crushing, so that the feed granularity is moderate, the discharge granularity is adjustable, and the discharge is uniform.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, in the step (5), the grinding station is broken by using a special steel slag rod mill 8, and the water content of the steel slag entering the rod mill 8 is less than 12%. Under the condition, the materials are crushed, ground and stripped, the effect is obvious, and the later magnetic separation effect is favorably improved.
In another embodiment of the present invention, on the basis of the above embodiment, the particle size of the material entering the cone crusher 7 in the step (2) is less than 120 mm.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 2, the magnetic rollers of the primary magnetic separator 5 and the secondary magnetic separator 6 are detachably combined, and each magnetic roller is connected to the motor through a cycloidal pin gear reducer. Therefore, the magnetic separator can operate in a controllable range in the whole process, and the magnetic separation effect is ensured.
On the basis of the above embodiment, in another embodiment of the present invention, the steel slag after being subjected to grinding in the step (5) sequentially passes through a material stabilizing bin 9 and a vibrating feeder 3 and then enters the secondary magnetic separator 6, and the material stabilizing bin 9 is connected with a feeding port of the secondary magnetic separator 6 through the vibrating feeder 3.
On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, the steel slag after the first-stage magnetic separation in the step (4) sequentially passes through the material stabilizing bin 9 and the vibrating feeder 3, and then enters the rod mill 8.
On the basis of the above embodiment, in another embodiment of the present invention, the primary magnetic separator 5 is a closed stepped double-roller magnetic separator, and the secondary magnetic separator 6 is a forward-washing direction special magnetic separator.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A steel slag iron removal process is characterized by comprising the following steps:
(1) transferring the steel slag to a material flattening conveying belt, wherein a material flattening machine used for controlling the thickness of a material layer is arranged on the material flattening conveying belt, and conveying the steel slag to a crushing station after preliminary iron particle removal is carried out on the material flattening conveying belt;
(2) crushing the steel slag by a crusher;
(3) conveying the crushed steel slag to a primary magnetic separator for magnetic separation of iron powder particles, and feeding the steel slag subjected to the primary magnetic separation into a screening station;
(4) conveying the steel slag with the particle size of less than 30mm into a grinding station after screening, and conveying the steel slag with the particle size of more than 30mm to a crushing station for crushing again;
(5) discharging the ground material from the discharge end, conveying the material to a secondary magnetic separator;
(6) secondary magnetic separation: conveying the steel slag subjected to secondary magnetic separation to a screening station, returning the material with the particle size of more than 5mm after screening to an abrasive station for regrinding, and taking the steel slag tailings with the particle size of less than 5mm after iron removal.
2. The process for removing iron from steel slag according to claim 1, wherein each of the primary magnetic separator and the secondary magnetic separator comprises at least two separation rollers, the separation rollers are arranged up and down, the adjacent separation rollers are horizontally spaced at a predetermined distance, and a movable material distribution plate is arranged between the adjacent separation rollers.
3. The process for removing iron from steel slag according to claim 2, wherein at least the secondary magnetic separator comprises three sorting drums, the uppermost sorting drum and the lowermost sorting drum being located on the same side of the intermediate sorting drum.
4. The process for removing iron from steel slag according to claim 2, wherein a special steel slag cone crusher is used for crushing in the step (2).
5. The process for removing iron from steel slag according to claim 2, wherein the grinding station in the step (5) is crushed by a special steel slag rod mill, and the water content of the steel slag entering the rod mill is less than 12%.
6. The process for removing iron from steel slag according to claim 4, wherein the particle size of the material entering the cone crusher in the step (2) is less than 120 mm.
7. The iron removal process from steel slag according to claim 2 or 3, wherein the magnetic rollers of the primary magnetic separator and the secondary magnetic separator are detachably combined, and each magnetic roller is connected with the motor through a cycloidal pin gear reducer.
8. The process for removing iron from steel slag according to claim 2 or 3, wherein the steel slag after being subjected to grinding in the step (5) sequentially passes through a material stabilizing bin and a vibrating feeder and then enters the secondary magnetic separator, and the material stabilizing bin is connected with a feeding port of the secondary magnetic separator through the vibrating feeder.
9. The process for removing iron from steel slag according to claim 5, wherein the steel slag after the first-stage magnetic separation in the step (4) sequentially passes through a material stabilizing bin and a vibrating feeder and then enters a rod mill.
10. The process for removing iron from steel slag according to claim 9, wherein the primary magnetic separator is a closed stepped double-roller magnetic separator, and the secondary magnetic separator is a forward-washing-direction special magnetic separator.
CN202111363351.5A 2021-11-17 2021-11-17 Steel slag iron removal process Pending CN114226044A (en)

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Application Number Priority Date Filing Date Title
CN202111363351.5A CN114226044A (en) 2021-11-17 2021-11-17 Steel slag iron removal process

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CN102688880A (en) * 2012-06-18 2012-09-26 武汉市天沭科技发展有限公司 Method for efficiently recovering and reselecting steel slag
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CN208906137U (en) * 2018-09-26 2019-05-28 湖北巨都玻纤新材料有限公司 A kind of kaolin flotation drying device
CN110788114A (en) * 2019-10-23 2020-02-14 迁安威盛固废环保实业有限公司 Real-time circulating iron removal and grinding method for steel slag
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CN110788114A (en) * 2019-10-23 2020-02-14 迁安威盛固废环保实业有限公司 Real-time circulating iron removal and grinding method for steel slag
CN111041136A (en) * 2019-12-04 2020-04-21 西安交通大学 Moving bed discharging device
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