Process system for crushing and magnetic separation and screening of smelting converter hot smelting slag

Abstract

The utility model relates to a kind of process systems of crushing magnetic separation screening metallurgical converter hot potting slag, including terrace screen, it is used to carry out primary screening to converter hot potting slag;Rod mill, it is used to carry out crushing to the converter hot potting slag that has passed primary screening;Vibration screen, it is used to screen the converter hot potting slag that has passed crushing into coarse converter hot potting slag and fine converter hot potting slag;Multiple belt conveyor, it is used to convey the converter hot potting slag that has passed primary screening from terrace screen to rod mill, belt conveyor is also used to convey the converter hot potting slag that has passed crushing from rod mill to vibration screen, belt conveyor is also used to convey coarse converter hot potting slag from vibration screen back to rod mill;Iron remover, it is arranged in one side of belt conveyor;Drum screen, it is used to further screen out multiple size products from fine converter hot potting slag after primary screening by vibration screen.The utility model improves the use efficiency of rod mill, reduces equipment total cost and production flow, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of hot slag recovery equipment, and in particular to a process system for crushing, magnetically separating, and screening hot slag from metallurgical converters. Background Technology

[0002] As the world's largest producer and consumer of steel, the large amount of solid waste generated during steel production has become an issue that cannot be ignored in the overall development of my country's environmental protection industry. This solid waste includes steel slag, which can be further processed into building materials. Based on current steel smelting technology in my country, approximately 100 kg of steel slag is generated for every 1 ton of steel produced. Converter hot slag is a loose-structured steel slag obtained by physically and chemically reacting high-temperature steel slag produced during steelmaking in a closed slag-quenching pool under the pressure and temperature of steam, dissolving free calcium oxide and other components. This slag has significant recycling value.

[0003] Currently, most steel mills in China use a process for treating converter hot slag that includes primary screening, secondary screening, secondary crushing, and magnetic separation. In the primary screening, a slag coarser separates large pieces of slag steel, while the remaining slag enters a jaw crusher. In the primary crushing, the jaw crusher breaks the slag down to a particle size of less than 50mm, and then the slag is conveyed to the slag coarser. In the secondary screening, the slag coarser separates medium-sized slag steel particles larger than 50mm, which are then returned to the jaw crusher for further crushing. Slag particles smaller than 50mm are fed into a rod mill. In the secondary crushing, the rod mill breaks the slag down to a particle size of less than 10mm. In the screening and magnetic separation process, the steel slag after secondary crushing in the rod mill passes through a vibrating screen (10mm screen aperture). Steel slag with a particle size of less than 10mm is separated into slag iron powder by a dry magnetic separator, and the remaining tailings enter the tailings silo. Tailings with a particle size greater than 10mm first pass through a belt magnetic separator to screen out the small-sized slag steel, and then are combined with the previously slag smaller than 10mm for magnetic separation. Steel slag larger than 10mm passes through a belt magnetic separator to separate the slag steel, and the rest are all returned to the rod mill for further crushing, completing one cycle. It can be seen that the traditional converter hot slag treatment process has the problems of long process, complicated production steps, single product particle size, and high operating costs, which is not conducive to improving economic efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems of long process, complicated production steps and high operating cost in the traditional converter hot slag treatment process in the prior art, and to provide a process system for crushing, magnetic separation and screening of metallurgical converter hot slag, which improves the utilization efficiency of the rod mill and reduces the total equipment cost and production process.

[0005] To solve the above-mentioned technical problems, this utility model provides a process system for crushing, magnetic separation, and screening hot slag from metallurgical converters, comprising: The floor screen is used for the initial screening of hot slag from converters; A rod mill is used to crush the converter hot slag that has passed the initial screening. A vibrating screen is used to separate the crushed converter hot slag into coarse converter hot slag and fine converter hot slag. Multiple belt conveyors are used to transport the primary screened converter hot slag from the floor screen to the rod mill. The belt conveyors are also used to transport the crushed converter hot slag from the rod mill to the vibrating screen. The belt conveyors are also used to transport the coarse converter hot slag from the vibrating screen back to the rod mill. The iron remover is located on one side of the belt conveyor.

[0006] In one embodiment of the present invention, a rotary drum screen is further included for screening the fine converter hot slag, and the belt conveyor is also used to transport the fine converter hot slag from the vibrating screen to the rotary drum screen.

[0007] In one embodiment of the present invention, the drum screen includes an upper section and a lower section, wherein the mesh size of the upper section is smaller than that of the lower section.

[0008] In one embodiment of this utility model, the plurality of belt conveyors includes a first belt conveyor, a second belt conveyor, a third belt conveyor, and a fourth belt conveyor, wherein the first belt conveyor is disposed between the floor screen and the rod mill, the second belt conveyor is disposed between the rod mill and the vibrating screen, the third belt conveyor is disposed between the vibrating screen and the drum screen, and the fourth belt conveyor is disposed between the rod mill and the vibrating screen.

[0009] In one embodiment of this utility model, the floor screen is flush with the ground, and a first collection funnel is provided below the floor screen, with the first collection funnel positioned above the first belt conveyor.

[0010] In one embodiment of the present invention, the iron remover includes a first iron remover and a second iron remover, wherein the first iron remover is disposed above the first belt conveyor and the second iron remover is disposed above the second belt conveyor.

[0011] In one embodiment of the present invention, it further includes multiple storage compartments with clearance space at the bottom, and each storage compartment is provided with a unloader, a weighing scale and a hoist below it.

[0012] In one embodiment of this utility model, the bottom of the storage compartment is configured as a funnel shape and is equipped with a gate.

[0013] In one embodiment of the present invention, a second collection funnel, a third collection funnel, and a fourth collection funnel are also included. The second collection funnel is located directly below the upper half of the drum screen, the third collection funnel is located directly below the lower half of the drum screen, and the fourth collection funnel is located directly below the end of the drum screen.

[0014] In one embodiment of the present invention, a loader is also included for conveying the converter hot slag to the floor screen.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: The process system for crushing, magnetically separating, and screening hot slag from metallurgical converters, as described in this utility model, first uses a floor screen to screen out large pieces of slag and steel, and then uses a rod mill to crush the hot slag from the converter multiple times, reducing the investment cost of setting up a coarse separator and multiple crushing equipment; a belt conveyor automatically transports the coarse hot slag from the vibrating screen back to the rod mill, realizing repeated crushing of the coarse hot slag from the converter and improving the utilization rate of the rod mill; a magnetic separator removes large particles of slag and steel from the hot slag from the converter, reducing the mechanical wear caused by large particles of slag and steel on the rod mill and vibrating screen, and also enabling the direct recycling of large particles of slag and steel. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram of the process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter in a preferred embodiment of this utility model.

[0017] Explanation of reference numerals in the accompanying drawings: 1. Floor screen; 2. Rod mill; 3. Vibrating screen; 4. First iron separator; 5. Second iron separator; 6. Drum screen; 7. First belt conveyor; 8. Second belt conveyor; 9. Third belt conveyor; 10. Fourth belt conveyor; 11. First elevator; 12. Second elevator; 13. Third elevator; 14. First storage bin; 15. Second storage bin; 16. Third storage bin; 17. First bin lower shipment processing unit; 18. Second bin lower shipment processing unit; 19. Third bin lower shipment processing unit; 20. Loader. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0019] Reference Figure 1As shown, in one embodiment of this utility model, a process system for crushing, magnetically separating, and screening hot slag from a metallurgical converter is disclosed, comprising: Floor screen 1, which is used for primary screening of converter hot slag; Rod mill 2, which is used to crush the converter hot slag that has passed the primary screening; Vibrating screen 3 is used to screen the crushed converter hot slag into coarse converter hot slag and fine converter hot slag. Multiple belt conveyors are used to transport the primary screened converter hot slag from the floor screen 1 to the rod mill 2. The belt conveyors are also used to transport the crushed converter hot slag from the rod mill 2 to the vibrating screen 3. The belt conveyors are also used to transport the coarse converter hot slag from the vibrating screen 3 back to the rod mill 2. The iron remover is located on one side of the belt conveyor.

[0020] The crushing, magnetic separation, and screening process system for hot slag from metallurgical converters described in this embodiment first screens out large pieces of slag steel using a floor screen 1, and then uses a rod mill 2 to crush the hot slag from the converter multiple times, reducing the investment cost of setting up a coarse separator and multiple crushing equipment; a belt conveyor automatically transports the coarse hot slag from the vibrating screen 3 back to the rod mill 2, realizing repeated crushing of the coarse hot slag from the converter, improving the utilization rate of the rod mill 2 and reducing equipment investment; a magnetic separator removes large particles of slag steel from the hot slag from the converter, reducing the mechanical wear caused by large particles of slag steel on the rod mill 2 and the vibrating screen 3, and also enabling the direct recycling of large particles of slag steel.

[0021] In one embodiment of this utility model, the floor screen 1 is used for initial screening to remove large pieces of slag steel and coarse converter hot slag with a particle size of less than 150mm. The large pieces of slag steel can be sent to steelmaking for recycling. The rod mill 2 is used for the first crushing of the coarse converter hot slag with a particle size of less than 150mm. The vibrating screen 3 is used for the second screening of the converter hot slag. The screen mesh size of the vibrating screen 3 is 10mm or more. Therefore, the fine converter hot slag includes three particle sizes: 0-5mm, 5-10mm and >10mm. It can be further sorted by the drum screen 6 described below. The coarse converter hot slag is transported back to the rod mill 2 and repeatedly crushed.

[0022] In one embodiment of this utility model, the iron separator can adsorb large slag steel particles in the converter hot slag during the conveyor belt conveyor process, thereby achieving the purpose of removing slag steel and reducing equipment wear. The iron separator is configured as a belt-type iron separator.

[0023] Reference Figure 1As shown, in one embodiment of this utility model, a drum screen 6 is further included for further screening the fine converter hot slag into products of various particle sizes. The fine converter hot slag screened out by the vibrating screen 3 is automatically transported to the drum screen 6 by the belt conveyor for further screening.

[0024] In one embodiment of this utility model, the drum screen 6 includes an upper section and a lower section. The upper section refers to the part of the drum screen 6 from the feed end to the middle of the screen body, and the lower section refers to the part of the drum screen 6 from the discharge end to the middle of the screen body. Since the drum is usually inclined, the converter hot slag will enter the screen body from the top and be screened before leaving from the end of the screen body. The screen mesh size of the upper section is smaller than that of the lower section. The hot slag with a particle size of 0-5mm is screened out in the upper section, the hot slag with a particle size of 5-10mm is screened out in the lower section, and the hot slag with a particle size >10mm is discharged at the end of the screen body. Therefore, the drum screen 6 can screen out converter hot slag with three particle sizes.

[0025] In one embodiment of this utility model, the mesh size of the upper half of the screen is 5mm, and the mesh size of the lower half of the screen is 10mm.

[0026] Reference Figure 1 As shown, in one embodiment of this utility model, the plurality of belt conveyors include a first belt conveyor 7, a second belt conveyor 8, a third belt conveyor 9, and a fourth belt conveyor 10. The first belt conveyor 7 is disposed between the floor screen 1 and the rod mill 2, and is used to transport converter hot slag from the floor screen 1 to the rod mill 2. The second belt conveyor 8 is disposed between the rod mill 2 and the vibrating screen 3, and is used to transport converter hot slag from the rod mill 2 to the vibrating screen 3. The third belt conveyor 9 is disposed between the vibrating screen 3 and the drum screen 6, and is used to transport fine furnace hot slag from the vibrating screen 3 to the drum screen 6. The fourth belt conveyor 10 is disposed between the rod mill 2 and the vibrating screen 3, and is used to transport coarse furnace hot slag from the vibrating screen 3 back to the rod mill 2 for repeated crushing.

[0027] In one embodiment of this utility model, the ground screen 1 is flush with the ground, which facilitates the loading of the loader 20 and the removal of large pieces of slag and steel. A first collection funnel is set below the ground screen 1 and is located above the first belt conveyor 7. The material screened by the ground screen 1 is collected by the first collection funnel and sent to the first belt conveyor 7 and fed into the rod mill 2, reducing the amount of hot slag falling to the ground.

[0028] Reference Figure 1As shown, in one embodiment of this utility model, the plurality of iron removers include a first iron remover 4 and a second iron remover 5. The first iron remover 4 is disposed above the first belt conveyor 7 and is used to magnetically remove large particles of slag steel from the converter hot slag on the first belt conveyor 7, thereby reducing the wear of the slag steel on the rod mill 2. The second iron remover 5 is disposed above the second belt conveyor 8 and is used to magnetically remove large particles of slag steel from the converter hot slag on the second belt conveyor 8, thereby reducing the wear of the slag steel on the drum screen 6.

[0029] Reference Figure 1 As shown, in one embodiment of this utility model, it further includes multiple storage bins with a clearance space at the bottom. The multiple storage bins include a first storage bin 14, a second storage bin 15, and a third storage bin 16. The first storage bin 14, the second storage bin 15, and the third storage bin 16 are respectively used to store converter hot slag of three particle sizes. The clearance space is used to park the converter hot slag transport vehicle. The clearance space has a net height of 4-5 meters. Each of the storage bins is equipped with a unloader, a weighing scale, and a hoist. The unloader is used to transfer the converter hot slag in the storage bin to a designated location. The weighing scale is used to weigh the converter hot slag released from the storage bin. The hoist is used to lift the converter hot slag screened from the drum screen 6 into the storage bin for storage.

[0030] Reference Figure 1 As shown, in one embodiment of the present invention, three elevators are included, namely a first elevator 11, a second elevator 12, and a third elevator 13; the first elevator 11 is disposed on one side of the first storage compartment 14, the second elevator 12 is disposed on one side of the second storage compartment 15, and the third elevator 13 is disposed on one side of the third storage compartment 16.

[0031] Reference Figure 1 As shown, in one embodiment of this utility model, three under-warehouse delivery processing units are also included. The three under-warehouse delivery processing units include a first under-warehouse delivery processing unit 17, a second under-warehouse delivery processing unit 18, and a third under-warehouse delivery processing unit 19. The first under-warehouse delivery processing unit 17 is equipped on the first storage bin 14, the third under-warehouse delivery processing unit 19 is equipped on the second storage bin 15, and the third under-warehouse delivery processing unit 19 is equipped on the third storage bin 16. The under-warehouse delivery processing units are used to automatically distribute the converter hot slag from the corresponding storage bins. The truck can directly receive and deliver materials at the bottom of the storage bin according to customer order requirements. The bottom of the storage bin is set in a funnel shape. Each under-warehouse delivery processing unit includes a controller and a gate set at the bottom of the corresponding storage bin. The operator in the central control room controls the gate to open or close automatically through the controller to realize automatic material discharge from the storage bin.

[0032] In one embodiment of this utility model, a second collection funnel, a third collection funnel, and a fourth collection funnel are also included. The second collection funnel is located directly below the upper half of the drum screen 6 and is used to collect the converter hot slag under the upper half of the screen. The third collection funnel is located directly below the lower half of the drum screen 6 and is used to collect the converter hot slag under the lower half of the screen. The fourth collection funnel is located directly below the end of the drum screen 6 and is used to collect the converter hot slag discharged from the end of the drum screen 6.

[0033] In one embodiment of the present invention, a loader 20 is also included for conveying the converter hot slag to the floor screen 1.

[0034] The working principle of the crushing, magnetic separation, and screening process for hot slag from metallurgical converters described in this utility model is as follows: Loader 20 feeds the converter hot slag onto floor screen 1, which screens out large pieces of slag and steel. The remaining converter hot slag is conveyed to rod mill 2 by first belt conveyor 7. Before entering rod mill 2, the converter hot slag is removed by first iron separator 4 to remove large particles of slag and steel. After being crushed for the first time by rod mill 2, the converter hot slag is conveyed to vibrating screen 3 by second belt conveyor 8. Before entering vibrating screen 3, the converter hot slag is removed by second iron separator 5 to remove large particles of slag and steel. The converter hot slag is then screened by vibrating screen 3 into coarse converter hot slag and fine converter hot slag. The coarse converter hot slag is conveyed back to the bar mill 2 by the fourth belt conveyor 10 for repeated crushing, and the fine converter hot slag is conveyed to the drum screen 6 by the third belt conveyor 9 for further screening. The fine converter hot slag is screened into three particle sizes and lifted by three elevators and stored in three storage bins respectively. When the fine converter hot slag is sold, the truck stops below the corresponding storage bin, and the operator in the central control room uses the controller to open the corresponding gate, so that the fine converter hot slag is discharged from the storage bin. After loading is completed, the gate is closed.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A process system for crushing, magnetically separating, and screening hot slag from metallurgical converters, characterized in that, include, The floor screen is used for the initial screening of hot slag from converters; A rod mill is used to crush the converter hot slag that has passed the initial screening. A vibrating screen is used to separate the crushed converter hot slag into coarse converter hot slag and fine converter hot slag. Multiple belt conveyors are used to transport the primary screened converter hot slag from the floor screen to the rod mill. The belt conveyors are also used to transport the crushed converter hot slag from the rod mill to the vibrating screen. The belt conveyors are also used to transport the coarse converter hot slag from the vibrating screen back to the rod mill. The iron remover is located on one side of the belt conveyor.

2. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 1, characterized in that, It also includes a drum screen for screening the fine converter hot slag, and the belt conveyor is also used to transport the fine converter hot slag from the vibrating screen to the drum screen.

3. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 2, characterized in that, The drum screen includes an upper section and a lower section, wherein the screen aperture of the upper section is smaller than that of the lower section.

4. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 2, characterized in that, The plurality of belt conveyors includes a first belt conveyor, a second belt conveyor, a third belt conveyor, and a fourth belt conveyor, wherein the first belt conveyor is disposed between the floor screen and the rod mill, the second belt conveyor is disposed between the rod mill and the vibrating screen, the third belt conveyor is disposed between the vibrating screen and the drum screen, and the fourth belt conveyor is disposed between the rod mill and the vibrating screen.

5. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 4, characterized in that, The floor screen is flush with the ground, and a first collection hopper is provided below the floor screen, which is located above the first belt conveyor.

6. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 4, characterized in that, The iron separator includes a first iron separator and a second iron separator, with the first iron separator positioned above the first belt conveyor and the second iron separator positioned above the second belt conveyor.

7. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 1, characterized in that, It also includes multiple storage compartments with clearance space at the bottom, and each of the storage compartments is equipped with a unloader, a weighing scale, and a hoist below it.

8. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 7, characterized in that, The bottom of the storage compartment is funnel-shaped and equipped with a gate.

9. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 3, characterized in that, It also includes a second collection hopper, a third collection hopper, and a fourth collection hopper. The second collection hopper is located directly below the upper half, the third collection hopper is located directly below the lower half, and the fourth collection hopper is located directly below the end of the drum screen.

10. The process system for crushing, magnetic separation, and screening hot slag from a metallurgical converter according to claim 1, characterized in that, It also includes a loader for conveying converter hot slag to the floor screen.

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