A method for producing alumina by steel-aluminum fusion

Abstract

The application relates to the technical field of steel metallurgy and non-ferrous metal, in particular to a method for producing alumina by steel-aluminum fusion, and relates to a briquetting device. The briquetting device comprises a supporting seat which is in a V-shaped structure, a square shell is arranged between two vertical sections of the supporting seat, the lower end of the square shell is open, a conveying belt mechanism is arranged directly below the square shell, a fixed plate is arranged on the left end surface of the square shell and connected with the supporting seat, a shaft column is arranged between the front and back vertical sections of the square shell, the shaft column is in a hollow structure, the shaft column is rotatably penetrated through the square shell and the supporting seat, a through hole is uniformly arranged on the left side of the upper end surface of the square shell along the shaft column, a feeding plate is arranged in the through hole and extends into the square shell, a material receiving mechanism is uniformly arranged on the shaft column along the circumferential direction of the shaft column, and an extruding mechanism is arranged on the upper end surface of the square shell.

Description

Technical Field

[0001] This invention relates to the fields of iron and steel metallurgy and non-ferrous metals technology, and in particular to a method for producing alumina by fusing steel and aluminum. Background Technology

[0002] Alumina production belongs to the non-ferrous chemical industry, and its production involves specialized technology. From design and plant construction to operation and management, the entire process is completed within the industry, with almost no involvement from other sectors. Therefore, the energy media required for alumina production must be newly built and supported. Similarly, steel production is also designed, constructed, and operated independently by the steel industry, with almost no connection to other chemical enterprises. Its surplus energy is consumed internally, and secondary energy conversion results in waste. If the steel and alumina production industries are integrated, the surplus energy from steel production can be directly used in the alumina process. For example, steam and coal gas can be directly utilized for their calorific value without secondary energy conversion, significantly improving economic efficiency. At the same time, the red mud discharged from alumina contains about 50% iron and can be directly sent to steel production as a substitute for iron ore resources, turning waste into treasure. Therefore, the integration of steel and aluminum, and the co-production of steel and chemicals, is a very scientific and reasonable design and production model.

[0003] Producing one ton of alumina requires approximately 1.5 tons of steam at a temperature of 180-200℃ and a pressure of 0.75-1 MPa, and about 95 cubic meters of natural gas. 3 Natural gas has a calorific value of around 8500 kcal. In current alumina production methods, steam is mainly produced by coal-fired boilers. However, producing low-temperature, low-pressure steam is neither cost-effective nor scientific in terms of thermal efficiency. Therefore, high-temperature, high-pressure steam is produced for power generation, and the high-temperature steam discharged from the turbine is then used for alumina production. This method is economically reasonable, but it has the following problems: 1. Using boilers to produce steam requires a large amount of coal or other energy sources, which not only increases carbon emissions significantly but also causes serious air pollution. This is inconsistent with the current advocacy of a green and low-carbon economic development model and also brings new difficulties to achieving carbon neutrality. 2. Natural gas, which is required for alumina production, is also an expensive energy source. Before using natural gas, coal gas was produced from coal as the roasting fuel for alumina. However, due to the high cost and heavy pollution of coal gas generators, the production was forced to switch to natural gas. Therefore, steam and natural gas are indispensable energy media for alumina production, accounting for 80% of the production cost of alumina (excluding bauxite) and are also the main energy media that restricts alumina production. Summary of the Invention

[0004] In view of the above problems, this application provides an invention title to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the present application provides the following technical solution: The present application provides a method for producing alumina by combining steel and aluminum, including the following steps: S1, steel and aluminum production line layout: an alumina production line is built next to the existing steel production line to carry out the combined layout of steel and aluminum production lines.

[0006] S2. Steam pipeline transportation: A steam pipeline is installed between the steel production line and the alumina production line. The steam generated by the steel production line is transported to the alumina production line through the steam pipeline. The temperature, pressure and quantity of the steam meet the requirements of alumina production.

[0007] S3. Pipeline gas transportation: While S2 is being carried out, a gas pipeline is installed between the steel production line and the alumina production line to transport the gas generated in the steel production line to the alumina production line. The calorific value, pressure and quantity of the gas meet the requirements of alumina production.

[0008] S4, Alumina Production: Alumina is produced by using the steam transported in S2 and the coal gas transported in S3.

[0009] S5. Red mud magnetic separation: The red mud discharged from the alumina production process in S4 is separated into magnetic minerals and non-magnetic minerals by magnetic separation.

[0010] S6, Briquetting: The magnetic minerals obtained from magnetic separation in S5 are briquetting into blocks using a briquetting device.

[0011] S7. Drying: The magnetic minerals compressed in S6 are dried and then sent to the blast furnaces and converters of the steel production line to replace iron ore resources.

[0012] The briquetting device involved in step S6 above includes a support base with a U-shaped structure. A square shell is installed between the two vertical sections of the support base, and the lower end of the square shell is open. A conveyor belt mechanism is set directly below the square shell. A fixing plate is installed on the left end face of the square shell and is connected to the support base. A shaft column is set between the front and rear vertical sections of the square shell. The shaft column has a hollow structure and its two ends rotate through the square shell and the support base. Through holes are evenly opened along the axial direction of the shaft column on the left side of the upper end face of the square shell. A feeding plate is installed in the through holes and extends into the square shell. A receiving mechanism is evenly arranged along the circumference of the shaft column. A pressing mechanism is set on the upper end face of the square shell.

[0013] The receiving mechanism includes a square tube. A square tube is mounted on the shaft column at a position corresponding to the feed plate along its axial direction via a support. The bottom of the inner cavity of the square tube is provided with a slope along its outer shape. A slot is opened on the shaft column at a position corresponding to the square tube. A support plate is installed in the slot. A support column is slidably mounted on the support plate through a compression spring. A base plate is installed at the upper end of the support column after passing through the support plate. The base plate has an isosceles trapezoidal structure, and the inclined surface of the base plate abuts against the slope of the square tube. A material stop is provided on the square tube to limit the range of motion of the red mud briquette. A material pusher is provided in the shaft column to push the support column.

[0014] As a preferred embodiment, the retaining element includes a receiving plate. A receiving plate is symmetrically arranged on the left and right sides of the square tube. A T-shaped plate is installed on the longitudinal section of the receiving plate near the side of the square tube. A guide groove is symmetrically opened on the front and rear end faces of the square tube. Two rollers that slide and cooperate with the corresponding guide grooves are arranged on the opposite faces of the two vertical sections of the receiving plate along their respective length directions. A connecting plate is hinged between the two receiving plates on the same square tube, and the other end of the connecting plate is hinged to the corresponding receiving plate. A driving component for pushing the receiving plate to move up and down is provided between the connecting plate and the shaft column.

[0015] As a preferred embodiment, the driving component includes a column, and the column is installed at the end of the connecting plate away from the shaft column. A compression spring is installed between the end face of the connecting plate away from the column and the shaft column. A guide plate installed on the square shell is provided on the right side between two adjacent square tubes. The left side of the guide plate has an arc-shaped structure, and the arc segment of the column and the guide plate slide together.

[0016] As a preferred embodiment, the pusher includes a shaft, which is coaxially and slidably installed inside the shaft column. Both ends of the shaft pass through the shaft column. A limiting plate is installed at each of the front and rear ends of the square shell. The two ends of the shaft and the corresponding limiting plates are slidably engaged by splines. The lower surface of the shaft inside the shaft column is provided with protrusions at positions corresponding to the support columns in the same group below. The protrusions are in the shape of right-angled trapezoids and abut against the support columns. A linkage is provided between the shaft and the extrusion mechanism.

[0017] As a preferred embodiment, the extrusion mechanism includes extrusion plates, with one extrusion plate positioned directly above each of the upper square tubes. A sliding rod that slides through the square shell is mounted on the upper end of the extrusion plate, and a connecting plate is mounted on the upper end of the sliding rod. A hydraulic cylinder is mounted on the upper surface of the square shell via a bracket, and the telescopic section of the hydraulic cylinder is connected to the connecting plate.

[0018] As a preferred embodiment, the linkage includes a rectangular plate, a rectangular plate is installed at the front end of the shaft, an L-shaped plate is provided on each of the left and right sides of the rectangular plate, the longitudinal section of the L-shaped plate is slidably installed on the upper end face of the square shell, and a connecting rod is hinged between the end of the longitudinal section of the L-shaped plate and the connecting plate, and the connecting rod is inclined to the rear side from top to bottom.

[0019] As a preferred embodiment, the upper part of the guide groove is an arc segment, and the lower part of the guide groove is a vertical segment.

[0020] The above-described one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0021] I. The method for producing alumina by steel-aluminum fusion proposed in this patent utilizes the surplus steam and gas generated in steel production to replace the steam that needs to be specially produced and the expensive natural gas that needs to be purchased in existing methods. To this end, the alumina production line is built next to the steel production line, and the surplus steam and gas from steel production are directly transported through pipelines. This is not only highly efficient but also low in cost. At the same time, it organically combines steel production and alumina production through the efficient utilization of energy media, achieving the goal of steel-aluminum fusion and steel-chemical co-production.

[0022] Second, the steel-aluminum fusion production method proposed in this patent reduces secondary energy conversion, shortens energy medium and logistics transportation distance, greatly reduces the production cost of alumina and steel, and improves the market competitiveness of enterprises. At the same time, the steel-aluminum fusion production method is a green and low-carbon production method, and is also a scientific and effective way to achieve circular economy and carbon neutrality.

[0023] Third, the briquetting device proposed in this patent uses a rotating shaft to rotate the square tubes sequentially into the extrusion processing range, thereby improving the efficiency of red mud briquetting. Moreover, the extrusion processing and the operation of pushing the briquetting blocks out to the conveyor belt mechanism do not interfere with each other and can be carried out simultaneously, thereby reducing device downtime and further improving the efficiency of red mud briquetting.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a process flow diagram for this application.

[0027] Figure 2 This is a three-dimensional structural diagram of the briquetting device of this application.

[0028] Figure 3 for Figure 2A schematic diagram of the three-dimensional structure after omitting the conveyor belt mechanism.

[0029] Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure after removing part of the support base and the square shell.

[0030] Figure 5 This is a schematic diagram of the structure between the baffle, the drive, and the square tube of the briquetting device of this application.

[0031] Figure 6 for Figure 5 Partial structural cross-sectional view.

[0032] Figure 7 This is a schematic diagram of the structure between the roller and the guide groove of the briquetting device of this application.

[0033] Figure 8 for Figure 5 Exploded view of the material stop component in the diagram.

[0034] Figure 9 for Figure 2 Partial structural cross-sectional view.

[0035] Figure label:

[0036] 10. Support base; 11. Square shell; 12. Conveyor belt mechanism; 13. Shaft column; 14. Feed plate; 2. Receiving mechanism; 20. Square tube; 21. Support plate; 22. Support column; 23. Base plate; 4. Stopper; 40. Receiving plate; 41. T-shaped plate; 42. Guide groove; 43. Roller; 44. Connecting plate; 5. Drive component; 50. Column; 51. Compression spring; 52. Guide plate; 6. Push component; 60. Shaft; 61. Limiting plate; 62. Protrusion; 7. Linkage component; 70. Rectangular plate; 71. L-shaped plate; 72. Connecting rod; 3. Extrusion mechanism; 30. Extrusion plate; 31. Slide rod; 32. Connecting plate; 33. Hydraulic cylinder. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a method for producing alumina by combining steel and aluminum includes the following steps: S1, steel-alumina production line layout: construct an alumina production line next to the existing steel production line to carry out the combined layout of steel and aluminum production lines.

[0039] S2. Steam pipeline transportation: A steam pipeline is installed between the steel production line and the alumina production line. The steam generated by the steel production line is transported to the alumina production line through the steam pipeline. The temperature, pressure and quantity of the steam meet the requirements of alumina production.

[0040] S3. Pipeline gas transportation: While S2 is being carried out, a gas pipeline is installed between the steel production line and the alumina production line to transport the gas generated in the steel production line to the alumina production line. The calorific value, pressure and quantity of the gas meet the requirements of alumina production.

[0041] S4, Alumina Production: Alumina is produced by using the steam transported in S2 and the coal gas transported in S3.

[0042] S5. Red mud magnetic separation: The red mud discharged from the alumina production process in S4 is separated into magnetic minerals and non-magnetic minerals by magnetic separation.

[0043] S6, Pressing: The magnetic minerals obtained from magnetic separation in S5 are conveyed to the feed plate 14. The magnetic minerals will slide down the feed plate 14 into the corresponding square cylinder. Then, the hydraulic cylinder 33 pushes the extrusion plate 30 downward through the column 50. The extrusion plate 30 will squeeze the magnetic minerals in the square cylinder, so that they are squeezed into blocks by the extrusion plate 30.

[0044] S7. Drying: The magnetic minerals that have undergone briquetting in S6 contain a certain degree of moisture. They are then dried and sent to the steel production line to replace iron ore resources.

[0045] The pressing device involved in step S6 above includes a support base 10, which has a U-shaped structure. A square shell 11 is installed between the two vertical sections of the support base 10, and the lower end of the square shell 11 is open. A conveyor belt mechanism 12 is arranged directly below the square shell 11. A fixing plate is installed on the left end face of the square shell 11 and is connected to the support base 10. A shaft column 13 is arranged between the front and rear vertical sections of the square shell 11. The shaft column 13 has a hollow structure and its two ends rotate through the square shell 11 and the support base 10. Through holes are evenly opened along the axial direction of the shaft column 13 on the left side of the upper end face of the square shell 11. A feeding plate 14 is installed in the through holes and extends into the square shell 11. A receiving mechanism 2 is evenly arranged along the circumference of the shaft column 13. A pressing mechanism 3 is arranged on the upper end face of the square shell 11.

[0046] like Figure 4 , Figure 5 and Figure 6 As shown, the receiving mechanism 2 includes a square tube 20. The square tube 20 is mounted on the shaft column 13 along its axial direction and at a position corresponding to the feed plate 14 via a support. The bottom of the inner cavity of the square tube 20 is provided with a slope along its outer shape. The shaft column 13 is provided with a slot at a position corresponding to the square tube 20. A support plate 21 is installed in the slot. A support column 22 is slidably mounted on the support plate 21 through a compression spring. The upper end of the support column 22 passes through the support plate 21 and is mounted with a bottom plate 23. The bottom plate 23 has an isosceles trapezoidal structure, and the inclined surface of the bottom plate 23 abuts against the slope of the square tube 20. A baffle 4 is provided on the square tube 20 to limit the range of motion of the red mud briquettes. A pusher 6 is provided in the shaft column 13 to push the support column 22.

[0047] In actual operation, the red mud is moved to the feed plate 14 by an external conveyor. At the same time, the external motor installed on the square shell 11 drives the shaft column 13 to rotate. The rotation of the shaft column 13 adjusts the position of the square tube 20, so that the red mud falling from the feed plate 14 falls into the corresponding square tube 20. Then, the shaft column 13 drives the square tube 20 containing the red mud to rotate and straighten. Then, the extrusion mechanism 3 extrudes the red mud in the square tube 20 to extrude it into blocks. Then, the shaft column 13 drives the square tube 20 to rotate. At this time, the baffle 4 will be inserted into the square tube 20 to limit the range of motion of the blocks. After the square tube 20 containing the blocks is rotated 180 degrees, when the extrusion mechanism 3 extrudes the red mud in the upper square tube 20, the extrusion mechanism 3 will drive the pusher 6 to move the bottom plate 23 below downward and push the blocks, thereby ensuring that the blocks fall to the conveyor belt mechanism 12 for transportation and subsequent processing.

[0048] like Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the retaining member 4 includes a receiving plate 40. A receiving plate 40 is symmetrically arranged on the left and right sides of the square tube 20. A T-shaped plate 41 is installed on the longitudinal section of the receiving plate 40 near the side of the square tube 20. A guide groove 42 is symmetrically opened on the front and rear end faces of the square tube 20. Two rollers 43 are arranged along their respective length directions on the opposite surfaces of the two vertical sections of the receiving plate 40, which slide in cooperation with the corresponding guide grooves 42. A connecting plate 44 is hinged between the two receiving plates 40 on the same square tube 20, and the other end of the connecting plate 44 is hinged to the corresponding receiving plate 40. A driving member 5 for pushing the receiving plate 40 to move up and down is provided between the connecting plate 44 and the shaft column 13.

[0049] like Figure 4 , Figure 5 and Figure 9As shown, the driving component 5 includes a column 50. The column 50 is installed at one end of the connecting plate 44 away from the shaft column 13. A compression spring 51 is installed between the end face of the connecting plate 44 away from the column 50 and the shaft column 13. A guide plate 52 is installed on the right side between two adjacent square tubes 20 and mounted on the square shell 11. The left side of the guide plate 52 has an arc-shaped structure, and the column 50 and the arc segment of the guide plate 52 slide together.

[0050] like Figure 7 and Figure 8 As shown, the upper part of the guide groove 42 is an arc segment, and the lower part of the guide groove 42 is a vertical segment.

[0051] In practice, after the red mud is pressed into blocks, the external motor drives the shaft column 13 to rotate. During the rotation of the shaft column 13, the column 50 will slide against the arc section of the guide plate 52, thereby pushing the column 50 to move towards the shaft column 13. During the movement of the column 50, the connecting plate 44 will prevent the receiving plate 40 from moving. During the movement of the receiving plate 40, it is supported by the cooperation of the rollers 43 and the guide groove 42. As the column 50 pushes, both rollers 43 will slide completely into the vertical section of the guide groove 42, causing the receiving plate 40 to rotate and align first. Then, as the column 50 pushes, the two rollers 43 slide in the guide groove 42, causing the T-shaped plate 41 to move towards the block. The T-shaped plate 41 will then contact the block, thereby reducing the impact of the shaft column 13 rotating during the rotation process. The swaying of the pressure block ensures its shape, which is then used for subsequent processing. When the column 50 detaches from the guide plate 52, the connecting plate 44 moves away from the shaft 13 under the push of the compression spring 51. The movement of the connecting plate 44 pushes the receiving plate 40, causing the T-shaped plate 41 to move out of the square tube 20. Then, the roller 43 on the side away from the shaft 60 moves to the arc section of the guide groove 42. As the connecting plate 44 continues to push the receiving plate 40, the roller 43 on the side away from the shaft 60 slides towards the arc section of the guide groove 42, while the roller 43 on the side closer to the shaft 60 slides along the vertical section of the guide groove 42. This causes the receiving plate 40 to drive the T-shaped plate 41 to flip. At this time, the pressure block in the square tube 20 can be pushed onto the conveyor belt mechanism 12 by the pusher 6.

[0052] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the pusher 6 includes a shaft 60, which is coaxially and slidably installed inside the shaft column 13. Both ends of the shaft 60 pass through the shaft column 13. A limiting plate 61 is installed at each of the front and rear ends of the square shell 11. The two ends of the shaft 60 and the corresponding limiting plates 61 are slidably engaged by splines. The lower surface of the shaft 60 inside the shaft column 13 is provided with protrusions 62 at positions corresponding to the support columns 22 in the same group below. The protrusions 62 are right-angled trapezoidal structures and abut against the support columns 22. A linkage 7 is provided between the shaft 60 and the extrusion mechanism 3.

[0053] like Figure 2 , Figure 3 and Figure 4 As shown, the linkage 7 includes a rectangular plate 70. The front end of the shaft 60 is equipped with a rectangular plate 70. An L-shaped plate 71 is provided on each of the left and right sides of the rectangular plate 70. The longitudinal section of the L-shaped plate 71 is slidably installed on the upper end face of the square shell 11. The end of the longitudinal section of the L-shaped plate 71 is hinged to the connecting plate 32 with a connecting rod 72, and the connecting rod 72 is inclined to the rear side from top to bottom.

[0054] like Figure 3 , Figure 4 and Figure 9 As shown, the extrusion mechanism 3 includes an extrusion plate 30. Each extrusion plate 30 is located directly above the square tube 20. The upper end of the extrusion plate 30 is equipped with a sliding rod 31 that slides through the square shell 11. The upper end of the sliding rod 31 is equipped with a connecting plate 32. The upper end face of the square shell 11 is equipped with a hydraulic cylinder 33 through a bracket. The telescopic section of the hydraulic cylinder 33 is connected to the connecting plate 32.

[0055] In actual operation, the hydraulic cylinder 33 moves downward through the extension section, pushing the extrusion plate 30 towards the corresponding square tube 20 via the connecting plate 32 and the slide rod 31 to extrude the red mud inside the square tube 20 into blocks. At the same time as the hydraulic cylinder 33 pushes the connecting plate 32, the connecting plate 32 will drive the L-shaped plate 71 to move backward via the connecting rod 72. The backward movement of the L-shaped plate 71 will drive the shaft 60 to move backward. The shaft 60 will then push the support column 22 via the protrusion 62. The support column 22 will move towards the square tube 20. During the movement of the support column 22, it will push the pressing block via the bottom plate 23, causing the pressing block to fall onto the conveyor belt mechanism 12. After extrusion is completed, the hydraulic cylinder 33 will drive the connecting plate 32, the slide rod 31, and the extrusion plate 30 to move upward away from the square tube 20. At the same time, it will drive the shaft 60 to move the protrusion 62 away from the support column 22. The support column 22 will reset under the action of the compression spring and pull the bottom plate 23 so that the inclined surface of the bottom plate 23 fits against the slope of the square tube 20.

[0056] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0057] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0059] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for producing alumina by fusing steel and aluminum, characterized in that, Includes the following steps: S1. Steel-aluminum production line layout: Construct an alumina production line next to the existing steel production line to achieve a combined steel-aluminum production line layout. S2. Steam pipeline transportation: A steam pipeline is installed between the steel production line and the alumina production line. The steam generated by the steel production line is transported to the alumina production line through the steam pipeline. The temperature, pressure and quantity of the steam meet the alumina production requirements. S3. Pipeline gas transportation: While S2 is being carried out, a gas pipeline is installed between the steel production line and the alumina production line to transport the gas generated in the steel production line to the alumina production line. The calorific value, pressure and quantity of the gas meet the requirements of alumina production. S4, Alumina Production: Alumina is produced by using the steam transported in S2 and the coal gas transported in S3. S5. Red mud magnetic separation: The red mud discharged from the alumina production process in S4 is separated into magnetic minerals and non-magnetic minerals by magnetic separation method. S6, Briquetting: The magnetic minerals obtained from magnetic separation in S5 are briquetted into blocks using a briquetting device; S7. Drying: The magnetic minerals briquetteed in S6 are dried and then sent to the blast furnace and converter of the steel production line to replace iron ore resources. The briquetting device involved in step S6 above includes a support base, which has a U-shaped structure. A square shell is installed between the two vertical sections of the support base, and the lower end of the square shell is open. A conveyor belt mechanism is set directly below the square shell. A fixing plate is installed on the left end face of the square shell and is connected to the support base. A shaft column is set between the front and rear vertical sections of the square shell, and the shaft column has a hollow structure. Both ends of the shaft column rotate through the square shell and the support base. Through holes are evenly opened along the axial direction of the shaft column on the left side of the upper end face of the square shell. A feeding plate is installed in the through holes and extends into the square shell. A receiving mechanism is evenly arranged along the circumference of the shaft column. An extrusion mechanism is set on the upper end face of the square shell. The receiving mechanism includes a square tube. A square tube is mounted on the shaft column at a position corresponding to the feed plate along its axial direction via a support. The bottom of the inner cavity of the square tube is provided with a slope along its outer shape. A slot is opened on the shaft column at a position corresponding to the square tube. A support plate is installed in the slot. A support column is slidably mounted on the support plate through a compression spring. A base plate is installed after the upper end of the support column passes through the support plate. The base plate has an isosceles trapezoidal structure, and the inclined surface of the base plate abuts against the slope of the square tube. A baffle is provided on the square tube to limit the range of motion of the red mud briquette. A pusher is provided in the shaft column to push the support column. The material stopper includes a receiving plate. A receiving plate is symmetrically arranged on the left and right sides of the square tube. A T-shaped plate is installed on the longitudinal section of the receiving plate near the side of the square tube. A guide groove is symmetrically opened on the front and rear end faces of the square tube. Two rollers that slide with the corresponding guide grooves are arranged on the opposite faces of the two vertical sections of the receiving plate along their respective length directions. A connecting plate is hinged between the two receiving plates on the same square tube, and the other end of the connecting plate is hinged to the corresponding receiving plate. A driving component for pushing the receiving plate to move up and down is provided between the connecting plate and the shaft column. The pusher includes a shaft, and the lower surface of the shaft inside the shaft is provided with protrusions at corresponding positions to the support columns in the same group below. The protrusions are in the shape of right-angled trapezoids and abut against the support columns. A linkage is provided between the shaft and the extrusion mechanism. The extrusion mechanism includes an extrusion plate. Each extrusion plate is located directly above the square tube. A sliding rod that slides through the square shell is installed at the upper end of the extrusion plate. A connecting plate is installed at the upper end of the sliding rod. A hydraulic cylinder is installed on the upper end face of the square shell through a bracket. The telescopic section of the hydraulic cylinder is connected to the connecting plate. When the hydraulic cylinder drives the extrusion plate to extrude the upper red mud, the synchronous drive linkage moves the protrusion to push the lower support, so that the slope of the bottom plate below no longer contacts the slope of the square tube and moves inside the square tube, completing the dropping of the press block.

2. The method for producing alumina by fusing steel and aluminum according to claim 1, characterized in that: The driving component includes a column, and the column is installed at the end of the connecting plate away from the shaft column. A compression spring is installed between the end face of the connecting plate away from the column and the shaft column. A guide plate is installed on the right side between two adjacent square tubes and mounted on the square shell. The left side of the guide plate has an arc-shaped structure, and the arc segment of the column and the guide plate slide together.

3. The method for producing alumina by fusing steel and aluminum according to claim 1, characterized in that: A shaft rod is coaxially and slidably installed inside the shaft column, with both ends of the shaft rod passing through the shaft column. A limiting plate is installed at each of the front and rear ends of the square shell, and the two ends of the shaft rod are slidably engaged with the corresponding limiting plates via splines.

4. The method for producing alumina by fusing steel and aluminum according to claim 1, characterized in that: The linkage component includes a rectangular plate, a rectangular plate is installed at the front end of the shaft, an L-shaped plate is provided on each of the left and right sides of the rectangular plate, the longitudinal section of the L-shaped plate is slidably installed on the upper end face of the square shell, and a connecting rod is hinged between the end of the longitudinal section of the L-shaped plate and the connecting plate, and the connecting rod is inclined to the rear side from top to bottom.

5. The method for producing alumina by fusing steel and aluminum according to claim 1, characterized in that: The upper part of the guide groove is an arc segment, and the lower part of the guide groove is a vertical segment.

Images