Low-aluminum-content waste residue resourceful treatment system and treatment process thereof

Abstract

The invention relates to a low-aluminum-content waste residue resourceful treatment system and a treatment process thereof, and relates to the technical field of aluminum smelting, the treatment system comprises a dust collection cover, grinding equipment and a calcining furnace, the grinding equipment comprises a rack and a workbench, the rack is provided with a motor and a grinding disc driven by the motor to rotate, and the axis of the grinding disc is horizontally arranged; the table top of the workbench is flush with the axis of the grinding disc, the grinding position of waste residues is eccentric to the center of the grinding disc, an air blowing structure is arranged on one side of the rack, an air blowing opening is formed in the position, facing the lower portion of the workbench, of the rack, the air blowing opening is located under the grinding position, and a receiving container is placed under the workbench. According to the treatment system and the treatment process, after the low-aluminum-content waste residues are ground into powder, the powder is screened through gravity and wind, and therefore the aluminum content in the needed powder is increased; after calcining in a calcining furnace, the waste residues are treated into high-alumina bauxite, so that the benefit is improved; grinding and air blowing can be completed only through one driving source of the motor, and cost and energy consumption are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum smelting, and in particular to a low-aluminum waste slag resource processing system and a processing process thereof. Background Art

[0002] When aluminum metal is melted, aluminum slag inevitably becomes a byproduct, accounting for about 3-5% of the total weight of aluminum melt. Aluminum slag is an important source of recycled aluminum. The aluminum slag just out of the furnace usually contains 50%-70% of aluminum metal. After conventional recycling, the remaining waste aluminum ash still contains 15-30% of aluminum metal. Due to the low aluminum grade, it is generally discarded without further aluminum extraction. The waste aluminum ash is usually disposed of by landfill, which not only wastes resources but also may cause environmental pollution.

[0003] In order to further recover aluminum resources from low-aluminum waste slag, an invention patent application with publication number CN106315643A discloses a method for producing calcium aluminate using waste aluminum ash. Waste aluminum ash and calcium oxide are used as raw materials, and reducing agent coke and precipitating agent iron filings are added. High-temperature smelting is carried out in an electric arc furnace. The calcium aluminate obtained after smelting is poured out, cooled, crushed and sorted, and can be used as a desulfurization agent for steelmaking.

[0004] According to the above-mentioned related technologies, low aluminum waste slag can also be further processed into bauxite. The main components of bauxite are diaspore and high aluminum silica, in which aluminum exists in the form of oxygen-containing compounds. Due to the low aluminum content in low aluminum waste slag, high aluminum bauxite cannot be made in the existing technology. High aluminum bauxite, as a raw material with higher aluminum content, is a raw material widely used in the metallurgical industry. Summary of the invention

[0005] The present application provides a low-aluminum waste slag resource processing system and a processing process thereof, which can process the low-aluminum waste slag into high-aluminum bauxite, thereby improving efficiency.

[0006] The present application provides a low-aluminum waste slag resource treatment system, which adopts the following technical solutions: A system for resource processing of low-aluminum waste slag, including grinding equipment and a calcining furnace, the grinding equipment including a frame and a workbench, the frame is provided with a motor and a grinding disc driven to rotate by the motor, the axis of the grinding disc is arranged horizontally, the table top of the workbench is flush with the axis of the grinding disc, the grinding position of the waste slag is eccentric to the center of the grinding disc, a blowing structure is provided on one side of the frame, the frame is provided with a blowing port facing below the workbench, the blowing port is located directly below the grinding position, and a receiving container is placed below the workbench.

[0007] By adopting the above technical solution, the table top of the workbench is set flush with the axis of the grinding disc. In the grinding position, the grinding disc rotates downward. This arrangement allows the material ground into powder to fall downward spontaneously and is not easy to raise dust. The waste slag is mixed with various substances, and the density of various substances is different, resulting in different horizontal floating distances under the action of wind. This principle can be used to screen different substances in the powder. After the low-aluminum waste slag is ground into powder, it is screened by gravity and wind to increase the aluminum content in the required powder; after calcination in a calcining furnace, the waste slag is processed into high-aluminum bauxite, thereby improving efficiency.

[0008] Optionally, the blowing structure includes a flywheel, which is fixed to the output end of the motor, and the grinding disc is fixed to the end face of the flywheel. A plurality of ribs are fixed to the side of the flywheel facing away from the grinding disc, and the plurality of ribs are distributed along the circumference of the flywheel. The two ends of the ribs are respectively located on the radial inner side and the radial outer side of the flywheel.

[0009] By adopting the above technical solution, when the flywheel rotates, the convex ribs generate suction at the air inlet, and the air sucked into the volute is finally blown out from the air outlet along the vertical outlet section. The acceleration effect of the convex ribs on the air is much lower than that of the impeller, so when the flywheel rotates at high speed with the grinding disc, the wind speed blown out of the air outlet will not be too fast, and the rotation of the flywheel will not generate too much resistance.

[0010] Optionally, the frame is fixed with a volute, an air inlet is provided in the middle of the end surface of the volute, the flywheel is located at the center of the volute, the outlet section of the volute is vertically downward and sealed, and the blowing port is connected to the inside of the outlet section of the volute.

[0011] By adopting the above technical solution and setting a volute, the wind energy generated by the rotation of the flywheel and the convex ribs can be blown out from the outlet section of the volute in a direction and then blown out from the air outlet, making the air duct more reasonable.

[0012] Optionally, a powder gap is provided between the end of the workbench and the grinding disc, and the width of the powder gap is less than 1 mm.

[0013] By adopting the above technical solution and setting the gap, the waste residue ground into powder can fall downward through the powder gap, thus avoiding insufficient grinding.

[0014] Optionally, a pushing cylinder is fixed on the workbench, and a pushing plate is fixed to the piston rod end of the pushing cylinder.

[0015] By adopting the above technical solution, the pushing cylinder drives the pushing plate to move, and the pushing plate is used to push the waste slag to press it onto the grinding disc, thereby maintaining grinding.

[0016] Optionally, the piston rod end of the pushing cylinder is slidably connected to an inner plate, a plurality of thorn rods are fixed to the inner plate, the thorn rods penetrate the push plate and are slidably connected to the push plate, a tension spring is fixed between the inner plate and the push plate, a limit block is fixed to the bottom of the inner plate, and the workbench is provided with a limit groove for the limit block to slide.

[0017] By adopting the above technical solution, the thorn rod is used to pierce into the waste slag block to improve stability and prevent the waste slag block from moving spontaneously. When the limit block slides to the end of the limit groove, the inner plate cannot move further. As the push cylinder drives the push plate to continue to move, the tension spring is stretched, and the thorn rod is gradually pulled out of the push plate to prevent the thorn rod from contacting the grinding disc, and then the push plate pushes the remaining waste slag onto the grinding disc for complete grinding.

[0018] Optionally, the frame is fixed with a support frame, the support frame is located below the air outlet and above the receiving container, two partitions are slidably connected to the support frame, and the support frame is rotatably connected with two screw rods, and the two screw rods are respectively threadedly connected to the two partitions.

[0019] By adopting the above technical solution, the screw rod is rotated to adjust the position of the corresponding partition, thereby adjusting the range of powder that can be received by the receiving container below.

[0020] Optionally, two guide plates are fixed to the lower end of the partition, and the lower ends of the two guide plates are far away from each other and are both inclined.

[0021] By adopting the above technical solution, the lower ends of the two guide plates are far away from each other and are both inclined, and the powder between the partitions is guided and collected by the guide plates.

[0022] In the second aspect, the present application provides a process for recycling low-aluminum waste slag, which adopts the following technical solution: A low-aluminum waste slag resource treatment process, using the above-mentioned low-aluminum waste slag resource treatment system, comprises the following steps: Step S1: scrape out the waste slag on the molten aluminum in the smelting furnace, let it stand to cool, and then tap the waste slag to make it dense and reduce its size; Step S2: placing the waste slag block on the workbench and starting the motor to rotate the grinding disc; Step S3: The waste slag block is pushed toward the grinding disc by the pushing cylinder, and the rotating grinding disc contacts the waste slag block, and the waste slag block is ground into powder, and the powder falls downward from the powder gap; Step S4: The blowing structure operates to blow air out of the blowing port, and the wind screens the powder, and the powder with high aluminum content is received by the receiving container; Step S5: pouring the powder in the receiving container into a calcining furnace for calcination at a temperature of 1100-1300° C.; Step S6: taking out the material in the calcining furnace and cooling it to make a high-alumina bauxite product.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through this treatment system and treatment process, low-aluminum waste slag is ground into powder, and then screened by gravity and wind, so as to increase the aluminum content in the required powder; after calcination in a calcining furnace, the waste slag is processed into high-aluminum bauxite, thereby improving efficiency; 2. Grinding and blowing can be completed with only one driving source, the motor, which reduces costs and energy consumption; 3. It can fully complete the grinding of waste slag without easily raising dust to affect the workshop environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of a low-aluminum waste slag resource processing system of an embodiment; Figure 2 is a front view of a grinding device of an embodiment; Figure 3 is a perspective view of a grinding device of an embodiment; Figure 4 is a front cross-sectional view of a workbench and a grinding disc of an embodiment; Figure 5 is a partial explosion of the embodiment Figure 1 ; Figure 6 is a partial explosion of the embodiment Figure 2 ; Figure 7 2 is a structural diagram of a screw rod and a partition plate of an embodiment.

[0025] Explanation of the reference numerals: 11. dust hood; 111. feed port; 112. discharge port; 1. grinding equipment; 10. calcining furnace; 2. frame; 3. workbench; 21. motor; 22. grinding disc; 31. powder gap; 4. pushing cylinder; 41. pushing plate; 42. inner plate; 43. thorn rod; 44. tension spring; 45. limit block; 32. limit groove; 23. air outlet; 5. receiving container; 6. flywheel; 61. volute; 62. air inlet; 63. convex rib; 7. support frame; 71. partition; 72. screw rod; 73. guide plate. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] Reference Figure 1 and Figure 2This embodiment discloses a low-aluminum waste slag resource processing system, including a dust hood 11, a grinding device 1 and a calcining furnace 10. In order to reduce dust pollution to the workshop, the grinding device 1 is installed in the dust hood 11 as a whole. A feed port 111 is provided on one side of the dust hood 11, and a discharge port 112 is provided on the adjacent side. The grinding device 1 is used to grind the waste slag into powder, and the calcining furnace 10 is used to receive the waste slag powder and then make it into high-alumina bauxite by calcining. The waste slag taken out from the smelting furnace is knocked and hammered in advance to reduce the internal looseness of the waste slag, make the waste slag more dense and reduce the size.

[0029] Reference Figure 3 and Figure 4 The grinding device 1 includes a frame 2 and a workbench 3. The waste residue introduced from the feed port 111 of the dust collecting cover 11 falls onto the workbench 3 through the funnel structure. The frame 2 is provided with a motor 21 and a grinding disc 22 driven to rotate by the motor 21. The axis of the grinding disc 22 is arranged horizontally. The table surface of the workbench 3 is flush with the axis of the grinding disc 22. The grinding position of the waste residue is eccentric to the center of the grinding disc 22. A powder gap 31 is arranged between the end of the workbench 3 and the grinding disc 22. The width of the powder gap 31 is less than 1 mm. By setting the gap, the waste residue ground into powder can fall downward through the powder gap 31 to avoid insufficient grinding. In the grinding position, the grinding disc 22 rotates downward. In this way, the material ground into powder can fall downward spontaneously and is not easy to raise dust.

[0030] A push cylinder 4 is fixed on the workbench 3, and a push plate 41 is fixed to the piston rod end of the push cylinder 4. An inner plate 42 is slidably connected to the piston rod end of the push cylinder 4, and a plurality of thorn rods 43 are fixed to the inner plate 42. The thorn rods 43 penetrate the push plate 41 and are slidably connected to the push plate 41. A tension spring 44 is fixed between the inner plate 42 and the push plate 41. The tension spring 44 is a strong spring. A limit block 45 is fixed to the bottom of the inner plate 42, and a limit groove 32 for the limit block 45 to slide is provided on the workbench 3. The push plate 41 is used to push the waste slag to press against the grinding disc 22, thereby maintaining grinding, and the thorn rods 43 are used to penetrate into the waste slag block to improve stability and prevent the waste slag block from moving spontaneously. When the limit block 45 slides to the end of the limit groove 32, the inner plate 42 cannot move further. As the pushing cylinder 4 drives the pushing plate 41 to continue to move, the tension spring 44 is stretched, and the piercing rod 43 is gradually pulled out of the pushing plate 41 to prevent the piercing rod 43 from contacting the grinding disc 22. Then the pushing plate 41 pushes the remaining waste slag onto the grinding disc 22 for complete grinding.

[0031] Reference Figure 3A blowing structure is provided on one side of the frame 2. A blowing port 23 is provided on the frame 2 toward the bottom of the workbench 3. The blowing port 23 is located directly below the grinding position. The blowing port 23 is opened horizontally. A receiving container 5 is placed below the workbench 3. Wind is blown into the blowing port 23 through the blowing structure, and the wind screens the powder. The receiving container 5 is used to receive the powder with a high aluminum content. Various substances are mixed in the waste slag, and the densities of various substances are different, resulting in different horizontal floating distances under the action of wind. Different substances in the powder can be screened by this principle. The landing point of the substance with a high aluminum content is determined in advance by experimental means. For the reception of the substance with a high aluminum content, the receiving position does not need to be precise, and the aluminum content requirement of high-alumina bauxite can be met.

[0032] Reference Figure 5 and Figure 6 The blowing structure includes a flywheel 6, which is fixed to the output end of the motor 21, and a grinding disc 22 is fixed on the end face of the flywheel 6. The frame 2 is provided with a circular hole of a size just right for the flywheel 6 to pass through. The flywheel 6 provides inertia for the rotation of the grinding disc 22, thereby improving the grinding force of the flywheel 6, and the flywheel 6 supports the reverse side of the grinding disc 22, so that the grinding disc 22 is not easily deformed during grinding, thereby improving the stability of grinding.

[0033] The frame 2 is fixed with a volute 61, and an air inlet 62 is provided in the middle of the end surface of the volute 61. The flywheel 6 is located at the center of the volute 61. The outlet section of the volute 61 is vertically downward and sealed, and the blowing port 23 is connected to the inside of the outlet section of the volute 61. A plurality of convex ribs 63 are fixed on the side of the flywheel 6 away from the grinding disc 22. The plurality of convex ribs 63 are distributed along the circumference of the flywheel 6, and the two ends of the convex ribs 63 are respectively located on the radial inner side and the radial outer side of the flywheel 6. When the flywheel 6 rotates, the convex ribs 63 cause the air inlet 62 to generate suction, and the air sucked into the volute 61 is finally blown out from the blowing port 23 along the vertical outlet section. The acceleration effect of the convex ribs 63 on the air is much lower than that of the impeller. Therefore, when the flywheel 6 rotates at high speed with the grinding disc 22, the wind speed blown out of the blowing port 23 will not be too fast, and the rotation of the flywheel 6 will not generate too much resistance.

[0034] Reference Figure 3 and Figure 7 The frame 2 is fixed with a support frame 7, which is located below the air outlet 23 and above the receiving container 5. Two partitions 71 are slidably connected to the support frame 7. Two screw rods 72 are rotatably connected to the support frame 7. The two screw rods 72 are respectively threadedly connected to the two partitions 71. The support frame 7 blocks the top of the screw rod 72 to prevent the screw rod 72 from falling dust. Two guide plates 73 are fixed to the lower end of the partition 71. The lower ends of the two guide plates 73 are far away from each other and are both inclined. The powder between the partitions 71 is guided and collected by the guide plates 73. The receiving container 5 is located below between the two partitions 71 and is used to receive powder with high aluminum content. Other containers can be placed on both sides of the receiving container 5 to receive other powder.

[0035] Half of the length of the screw rod 72 is a smooth rod section, and the other half is a threaded section, and the smooth rod section of one screw rod 72 corresponds to the threaded section of the other screw rod 72, and the two partitions 71 are respectively slidably connected to the smooth rod sections of the two screw rods 72, and the two partitions 71 are respectively threadedly connected to the threaded sections of the two screw rods 72. A handle is fixed to the end of the screw rod 72, and the handle drives the corresponding screw rod 72 to rotate, thereby adjusting the position of the corresponding partition 71, thereby adjusting the range of powder that can be received by the lower receiving container 5.

[0036] After the receiving container 5 receives the powder with high aluminum content, the receiving container 5 is taken out from the discharge port 112 and moved to the calcining furnace 10. The powder in the receiving container 5 is poured into the calcining furnace 10 for calcination, and then cooled to produce a high-alumina bauxite product.

[0037] Embodiment 2

[0038] A low aluminum content waste slag resource treatment process, using a low aluminum content waste slag resource treatment system of embodiment 1, comprises the following steps: Step S1: scrape out the waste slag on the molten aluminum in the smelting furnace, let it stand to cool, and then knock and beat the waste slag to make it dense and reduce its size.

[0039] Step S2: placing the waste slag block on the workbench 3, and starting the motor 21 to rotate the grinding disc 22.

[0040] Step S3: The waste slag block is pushed toward the grinding disc 22 by the pushing cylinder 4 , and the rotating grinding disc 22 contacts the waste slag block, and the waste slag block is ground into powder, which falls downward from the powder gap 31 .

[0041] Step S4: The blowing structure operates to blow out air from the blowing port 23 , and the wind screens the powder. The powder with high aluminum content is received by the receiving container 5 .

[0042] Step S5: pour the powder in the receiving container 5 into the calcining furnace 10 for calcination at a temperature of 1100-1300°C.

[0043] Step S6: taking out the material in the calcining furnace 10 and cooling it to make a high-alumina bauxite product.

[0044] In summary, through the above-mentioned processing system and processing process, the low-aluminum waste slag is ground into powder, and then screened by gravity and wind, thereby increasing the aluminum content in the required powder; after calcination in the calcining furnace 10, the waste slag is processed into high-aluminum bauxite, thereby improving efficiency. For grinding and blowing, only one driving source, the motor 21, can be used to complete it, reducing costs and energy consumption.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A low aluminum content waste slag resource processing system, characterized by: The invention comprises a grinding device (1) and a calcining furnace (10), wherein the grinding device (1) comprises a frame (2) and a workbench (3), wherein the frame (2) is provided with a motor (21) and a grinding disc (22) driven to rotate by the motor (21), wherein the axis of the grinding disc (22) is arranged horizontally, the table surface of the workbench (3) is flush with the axis of the grinding disc (22), the grinding position of the waste slag is eccentric to the center of the grinding disc (22), a blowing structure is arranged on one side of the frame (2), and a blowing port (23) is arranged on the frame (2) toward the bottom of the workbench (3), wherein the blowing port (23) is located directly below the grinding position, and a receiving container (5) is placed below the workbench (3).

2. A low aluminum content waste slag resource treatment system according to claim 1, characterized in that: The blowing structure comprises a flywheel (6), the flywheel (6) is fixed to the output end of the motor (21), the grinding disc (22) is fixed to the end face of the flywheel (6), a plurality of convex ribs (63) are fixed to a side of the flywheel (6) facing away from the grinding disc (22), the plurality of convex ribs (63) are distributed along the circumference of the flywheel (6), and two ends of the convex ribs (63) are respectively located on the radial inner side and the radial outer side of the flywheel (6).

3. A low aluminum content waste slag resource treatment system according to claim 2, characterized in that: The frame (2) is fixed with a volute (61), the middle part of the end surface of the volute (61) is provided with an air inlet (62), the flywheel (6) is located at the center of the volute (61), the outlet section of the volute (61) is vertically downward and sealed, and the blowing port (23) is connected to the inside of the outlet section of the volute (61).

4. The low aluminum content waste slag resource treatment system according to claim 1 is characterized by: A powder gap (31) is provided between the end of the workbench (3) and the grinding disc (22), and the width of the powder gap (31) is less than 1 mm.

5. The low aluminum content waste slag resource processing system according to claim 1 is characterized by: A pushing cylinder (4) is fixed on the workbench (3), and a pushing plate (41) is fixed at the piston rod end of the pushing cylinder (4).

6. A low aluminum content waste slag resource processing system according to claim 5, characterized in that: The piston rod end of the pushing cylinder (4) is slidably connected to an inner plate (42), a plurality of thorn rods (43) are fixed on the inner plate (42), the thorn rods (43) penetrate the push plate (41) and are slidably connected to the push plate (41), a tension spring (44) is fixed between the inner plate (42) and the push plate (41), a limit block (45) is fixed at the bottom of the inner plate (42), and the workbench (3) is provided with a limit groove (32) for the limit block (45) to slide.

7. The low aluminum content waste slag resource processing system according to claim 1 is characterized by: The frame (2) is fixed with a support frame (7), the support frame (7) is located below the air outlet (23) and above the receiving container (5), two partitions (71) are slidably connected to the support frame (7), and the support frame (7) is rotatably connected with two screw rods (72), and the two screw rods (72) are respectively threadedly connected to the two partitions (71).

8. The low aluminum content waste slag resource processing system according to claim 7 is characterized by: Two guide plates (73) are fixed to the lower end of the partition plate (71), and the lower ends of the two guide plates (73) are away from each other and are both inclined.

9. A process for recycling low-aluminum waste slag, characterized in that: A low-aluminum waste slag resource treatment system according to any one of claims 1 to 8 is used, comprising the following steps: Step S1: scrape out the waste slag on the molten aluminum in the smelting furnace, let it stand to cool, and then tap the waste slag to make it dense and reduce its size; Step S2: placing the waste slag block on the workbench (3), and starting the motor (21) to rotate the grinding disc (22); Step S3: The waste slag block is pushed toward the grinding disc (22) by the pushing cylinder (4), and the rotating grinding disc (22) contacts the waste slag block, and the waste slag block is ground into powder, and the powder falls downward from the powder gap (31); Step S4: The blowing structure operates to blow air out of the blowing port (23), and the wind screens the powder, and the powder with a high aluminum content is received by the receiving container (5); Step S5: pouring the powder in the receiving container (5) into the calcining furnace (10) for calcination at a temperature of 1100-1300° C.; Step S6: taking out the material in the calcining furnace (10), and cooling it to produce a high-alumina bauxite product.

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