A secondary aluminum ash treatment system for the resource utilization of aluminum ash

Abstract

A secondary aluminum ash treatment system for the resource utilization of aluminum ash, comprising a rotary kiln, a raw material treatment system, a clinker treatment system and an exhaust gas treatment system. The raw material treatment system briquettes the secondary aluminum ash, and after crushing and screening, the appropriate-sized lumps are sent to a vertical preheater for preheating. The preheated materials then enter the rotary kiln for calcination to achieve the effects of denitrification, defluorination and desalination of the aluminum ash. After being cooled by a single-cylinder cooler, they are ground into powder through the clinker treatment system. The obtained powder has high-aluminum characteristics and can be used as an admixture for refractory materials. The exhaust gas treatment system collects the dust ash at the kiln tail, turning waste into treasure, realizing the resource utilization of secondary aluminum ash, reducing the environmental protection pressure, solving the enterprise problem of the storage of secondary aluminum ash, reducing the expenditure on aluminum ash disposal costs, and also being able to realize the recycling of salts, effectively reducing the amount of salt added in the extraction of aluminum from primary aluminum ash.

Description

Technical Field

[0001] The present invention relates to the field of aluminum ash treatment systems, and particularly to a secondary aluminum ash treatment system for the resource utilization of aluminum ash. Background Art

[0002] Aluminum ash is generated in all production processes where aluminum is melted, including electrolytic aluminum, aluminum processing, and waste aluminum recycling. As an important solid waste in the aluminum industry, the output of aluminum ash is huge. Most domestic enterprises mainly dispose of aluminum ash by direct stacking, which poses significant environmental protection risks. In the composition of aluminum ash, ALN, AL, and AL3N4 will release a large amount of ammonia gas when encountering water, and generate flammable and explosive gases such as hydrogen and methane. The accumulation of dissolved salts will lead to soil salinization and water pollution. In addition, the leaching toxicity of fluoride exceeds the standard, and direct stacking will also pollute the surrounding groundwater and soil. At present, domestic enterprises have carried out metal aluminum recovery treatment on primary aluminum ash, and the technical means are relatively mature. However, there is a lack of economic, efficient, and environmentally friendly technologies for the full-scale resource utilization of secondary aluminum ash, making it difficult to solve the problem of secondary aluminum ash stacking. Summary of the Invention

[0003] To solve the problem of difficult treatment and large stacking of secondary aluminum ash, the present invention provides a secondary aluminum ash treatment system for the resource utilization of aluminum ash.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a secondary aluminum ash treatment system for the resource utilization of aluminum ash, including a rotary kiln, a raw material treatment system, a clinker treatment system, and an exhaust gas treatment system. The raw material treatment system includes a first bucket elevator, a raw material buffer bin, a briquetting machine, a roll crusher, a vibrating screen, a belt conveyor, a second bucket elevator, a lump material bin, a raw material metering feeder, a preheater bin, and a vertical preheater. The first bucket elevator can lift secondary aluminum ash to the raw material buffer bin. The secondary aluminum ash can sequentially fall downward from the bottom discharge port of the raw material buffer bin to the briquetting machine, the roll crusher, and the vibrating screen. The vibrating screen can screen the raw materials that have been briquetted by the briquetting machine and crushed by the roll crusher. The vibrating screen can convey the raw materials with unqualified particle sizes to the first bucket elevator and lift them back to the raw material buffer bin. The vibrating screen can also convey the qualified lump materials to the belt conveyor. The belt conveyor can convey the lump materials to the second bucket elevator. The second bucket elevator can lift the lump materials to the lump material bin. A lump material bin rod valve is provided at the bottom discharge port of the lump material bin. The lump materials can fall from the bottom of the lump material bin through the lump material bin rod valve to the raw material metering feeder. The raw material metering feeder can convey the lump materials to the preheater bin. The vertical preheater is installed on the top of the kiln tail box of the rotary kiln. The vertical preheater can preheat the lump materials falling from the preheater bin, so that the preheated lump materials can enter the rotary kiln from the top of the kiln tail box for calcination.

[0005] The clinker processing system includes a single-cylinder cooler, a first water-cooled conveyor, a third bucket elevator, a clinker silo, a clinker metering feeder, a chain bucket conveyor, a vertical mill, a first cyclone dust collector, a recycle fan, and a powder conveyor. The inlet end of the single-cylinder cooler is connected to the bottom of the kiln head box of the rotary kiln, so that the calcined clinker can enter the single-cylinder cooler from the bottom of the kiln head box for cooling. The first water-cooled conveyor can convey the clinker sent out from the outlet end of the single-cylinder cooler to the third bucket elevator. The third bucket elevator can lift the clinker to the clinker silo. The clinker can sequentially fall downward from the bottom discharge port of the clinker silo to the clinker metering feeder and the chain bucket conveyor. The chain bucket conveyor can convey the clinker into the vertical mill for grinding. The first cyclone dust collector can collect the powder generated by the vertical mill through the air separation power of the recycle fan. A first gravity valve is provided at the bottom discharge port of the first cyclone dust collector, and the powder can fall from the bottom of the first cyclone dust collector through the first gravity valve to the powder conveyor;

[0006] The waste gas treatment system includes a second cyclone dust collector, a second water-cooled conveyor, a mechanical cooler, a pneumatic conveying pump, a bag filter, a waste ash conveyor, a waste ash silo, a denitration tower, a high-temperature fan, and a chimney. The second cyclone dust collector is connected to the top air outlet of the vertical preheater, so that the waste gas in the rotary kiln can enter the second cyclone dust collector from the kiln tail box for primary dust removal. The second cyclone dust collector can convey the waste gas into the mechanical cooler for cooling. The mechanical cooler can convey the waste gas into the bag filter for secondary dust removal. The bag filter can convey the waste gas into the denitration tower for denitration treatment. The waste gas can be sent from the denitration tower into the chimney and discharged through the high-temperature fan; A second gravity valve is provided at the bottom discharge port of the second cyclone dust collector, and the waste ash in the second cyclone dust collector can fall through the second gravity valve to the second water-cooled conveyor. The second water-cooled conveyor can convey the waste ash to the pneumatic conveying pump. The bottom discharge port of the mechanical cooler is connected to the pneumatic conveying pump, so that the waste ash in the mechanical cooler can fall into the pneumatic conveying pump. The pneumatic conveying pump can convey the waste ash to the waste ash silo. The waste ash conveyor is connected to the bottom discharge port of the bag filter, so that the waste ash in the bag filter can fall into the waste ash conveyor. The waste ash conveyor can convey the waste ash to the waste ash silo.

[0007] Preferably, a cooler rod valve, a large material bin, and a counterattack crusher are provided at the outlet end of the single-cylinder cooler. The clinker can fall from the outlet end of the single-cylinder cooler through the cooler rod valve to the first water-cooled conveyor. The large material bin can receive the large clinker blocks that cannot pass through the cooler rod valve. The large clinker blocks can fall from the bottom discharge port of the large material bin into the counterattack crusher for crushing, so that the crushed clinker can fall onto the first water-cooled conveyor for conveying.

[0008] Preferably, the air outlet of the circulating fan is respectively connected to the vertical mill and the single-unit dust collector, so as to convey the powder-containing air flow sent by the circulating fan to the vertical mill, and remove the powder from the powder-containing air flow sent by the circulating fan through the single-unit dust collector. The bottom discharge port of the single-unit dust collector is connected to the powder conveyor, so as to facilitate the powder in the single-unit dust collector to fall onto the powder conveyor.

[0009] Preferably, the kiln head box of the rotary kiln is connected to the burner, and the burner is also connected to the Roots blower for adjusting the flame shape.

[0010] Preferably, the waste gas treatment system further includes an electric louver valve for adjusting the air intake volume.

[0011] According to the above technical solution, the beneficial effects of the present invention are:

[0012] The present invention briquettes the secondary aluminum ash, crushes and screens it, sends the block materials with appropriate particle size to the vertical preheater for preheating, and then the preheated materials enter the rotary kiln for calcination, so that the aluminum ash achieves the effects of denitrification, defluorination and desalination. After being cooled by the single-cylinder cooler, it is ground into powder. The obtained powder has high-aluminum characteristics and can be used as an admixture for refractory materials; the dust ash at the kiln tail contains a high salt content, and after being collected by the system, it can be reused as primary aluminum ash with added salt for aluminum extraction. By using the vertical preheater, the temperature of the raw materials entering the kiln is increased, and the raw materials are pre-decomposed, shortening the residence time of the aluminum ash in the rotary kiln. Therefore, the specifications of the rotary kiln can be reduced. The present invention turns waste into treasure, realizes the resource utilization of secondary aluminum ash, reduces the environmental protection pressure, solves the problems of enterprises with the storage of secondary aluminum ash, reduces the expenditure on the disposal cost of aluminum ash, and can also realize the recycling of salts, effectively reducing the amount of salt added for aluminum extraction from primary aluminum ash. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the system of the present invention;

[0014] Figure 2 is Figure 1 an enlarged view of the upper half;

[0015] Figure 3 is Figure 1 an enlarged view of the lower half.

[0016] Markings in the figure: 1. First bucket elevator, 2. Raw material buffer bin, 3. Briquetting press, 4. Roller crusher, 5. Vibrating screen, 6. Belt conveyor, 7. Second bucket elevator, 8. Lump material bin, 9. Lump material bin rod valve, 10. Raw material metering feeder, 11. Preheater bin, 12. Vertical preheater, 13. Rotary kiln, 14. Single-cylinder cooler, 15. Large material bin, 16. Impact crusher, 17. Cooler rod valve, 18. First water-cooled conveyor, 19. Third bucket elevator, 20. Clinker bin, 21. Clinker metering feeder, 22. Chain bucket conveyor, 23. Vertical mill, 24. First cyclone dust collector, 25. First heavy hammer valve, 26. Circulating fan, 27. Single-unit dust collector, 28. Powder conveyor, 29. Burner, 30. Roots blower, 31. Second cyclone dust collector, 32. Second heavy hammer valve, 33. Second water-cooled conveyor, 34. Mechanical cooler, 35. Pneumatic conveying pump, 36. Bag dust collector, 37. Waste ash conveyor, 38. Waste ash bin, 39. Denitration tower, 40. High-temperature fan, 41. Chimney, 42. Electric louver valve. Detailed implementation mode

[0017] Referring to the attached drawings, the detailed implementation mode is as follows:

[0018] A secondary aluminum ash treatment system for the resource utilization of aluminum ash includes a rotary kiln 13, a raw material treatment system, a clinker treatment system, and an exhaust gas treatment system. The raw material treatment system includes a first bucket elevator 1, a raw material buffer bin 2, a briquetting press 3, a roller crusher 4, a vibrating screen 5, a belt conveyor 6, a second bucket elevator 7, a lump material bin 8, a raw material metering feeder 10, a preheater bin 11, and a vertical preheater 12. The first bucket elevator 1 can lift the secondary aluminum ash to the raw material buffer bin 2, and the secondary aluminum ash can sequentially fall downward from the bottom discharge port of the raw material buffer bin 2 to the briquetting press 3, the roller crusher 4, and the vibrating screen 5. The vibrating screen 5 can screen the raw materials that have been briquetted by the briquetting press 3 and crushed by the roller crusher 4. The vibrating screen 5 can convey the raw materials with unqualified particle sizes to the first bucket elevator 1 and lift them back to the raw material buffer bin 2 to form a closed-loop cycle.

[0019] The vibrating screen 5 can also convey the qualified-sized lump materials to the belt conveyor 6. The belt conveyor 6 can convey the lump materials to the second bucket elevator 7. The second bucket elevator 7 can lift the lump materials to the lump material bin 8. A lump material bin rod valve 9 is provided at the bottom discharge port of the lump material bin 8. The lump materials can fall from the bottom of the lump material bin 8 through the lump material bin rod valve 9 to the raw material metering feeder 10. The raw material metering feeder 10 can convey the lump materials to the preheater bin 11. The vertical preheater 12 is installed on the top of the kiln tail box of the rotary kiln 13. The vertical preheater 12 can preheat the lump materials falling from the preheater bin 11. The preheated lump materials can enter the rotary kiln 13 from the top of the kiln tail box for calcination. The kiln head box of the rotary kiln 13 is connected to the burner 29. The burner 29 is also connected to the Roots blower 30 for adjusting the flame shape.

[0020] The clinker processing system includes a single-cylinder cooler 14, a first water-cooled conveyor 18, a third bucket elevator 19, a clinker bin 20, a clinker metering feeder 21, a chain bucket conveyor 22, a vertical mill 23, a first cyclone dust collector 24, a circulating fan 26 and a powder conveyor 28. The inlet end of the single-cylinder cooler 14 is connected to the bottom of the kiln head box of the rotary kiln 13. The calcined clinker can enter the single-cylinder cooler 14 from the bottom of the kiln head box for cooling. A cooler rod valve 17, a large material bin 15 and a counterattack crusher 16 are provided at the outlet end of the single-cylinder cooler 14. The clinker can fall from the outlet end of the single-cylinder cooler 14 through the cooler rod valve 17 to the first water-cooled conveyor 18. The large material bin 15 can receive the large clinker lumps that cannot pass through the cooler rod valve 17. The large clinker lumps can fall from the bottom discharge port of the large material bin 15 into the counterattack crusher 16 for crushing. The crushed clinker will fall into the first water-cooled conveyor 18 for conveying.

[0021] The first water-cooled conveyor 18 can convey the clinker sent out from the outlet end of the single-cylinder cooler 14 to the third bucket elevator 19. The third bucket elevator 19 can lift the clinker to the clinker bin 20. The clinker can fall sequentially downward from the bottom discharge port of the clinker bin 20 to the clinker metering feeder 21 and the chain bucket conveyor 22. The chain bucket conveyor 22 can convey the clinker into the vertical mill 23 for grinding. The first cyclone dust collector 24 can collect the powder generated by the vertical mill 23 through the air separation power of the circulating fan 26. A first weight valve 25 is provided at the bottom discharge port of the first cyclone dust collector 24. The powder can fall from the bottom of the first cyclone dust collector 24 through the first weight valve 25 to the powder conveyor 28. The air outlet of the circulating fan 26 is respectively connected to the vertical mill 23 and the single-unit dust collector 27, and can convey the powder-containing air flow sent out by the circulating fan 26 to the vertical mill 23 and remove the powder from the powder-containing air flow sent out by the circulating fan 26 through the single-unit dust collector 27. The powder in the single-unit dust collector 27 can also fall into the powder conveyor 28 and finally be sent out of the system for storage and can be sold as a refractory material admixture.

[0022] The waste gas treatment system includes a second cyclone dust collector 31, a second water-cooled conveyor 33, a forced draft cooler 34, a pneumatic conveying pump 35, a bag filter 36, a waste ash conveyor 37, a waste ash bin 38, a denitration tower 39, a high-temperature fan 40 and a chimney 41. The second cyclone dust collector 31 is connected to the top air outlet of the vertical preheater 12. The waste gas in the rotary kiln 13 can enter the second cyclone dust collector 31 from the kiln tail box for primary dust removal. The second cyclone dust collector 31 can convey the waste gas to the forced draft cooler 34 for cooling. The forced draft cooler 34 can convey the waste gas to the bag filter 36 for secondary dust removal. The bag filter 36 can convey the waste gas to the denitration tower 39 for denitration treatment. Through the high-temperature fan 40, the waste gas can be sent from the denitration tower 39 into the chimney 41 and discharged. The waste gas treatment system also includes an electric louver valve 42 capable of adjusting the air intake volume, and the air temperature can be controlled by adjusting the opening degree.

[0023] A second hammer valve 32 is provided at the bottom discharge port of the second cyclone dust collector 31. The waste ash in the second cyclone dust collector 31 can fall to the second water-cooled conveyor 33 through the second hammer valve 32. The second water-cooled conveyor 33 can convey the waste ash to the pneumatic conveying pump 35. The bottom discharge port of the forced draft cooler 34 is connected to the pneumatic conveying pump 35. The waste ash in the forced draft cooler 34 can fall to the pneumatic conveying pump 35. The pneumatic conveying pump 35 can convey the waste ash to the waste ash bin 38. The waste ash conveyor 37 is connected to the bottom discharge port of the bag filter 36. The waste ash in the bag filter 36 can fall to the waste ash conveyor 37. The waste ash conveyor 37 can convey the waste ash to the waste ash bin 38 for storage. The salts in the waste ash are enriched and can be reused for extracting aluminum from primary aluminum ash with added salt.

Claims

1. A secondary aluminum ash treatment system for the resource utilization of aluminum ash, characterized in that: It includes a rotary kiln (13), a raw material processing system, a clinker processing system and an exhaust gas processing system. The raw material processing system includes a first bucket elevator (1), a raw material buffer bin (2), a briquetting machine (3), a roll crusher (4), a vibrating screen (5), a belt conveyor (6), a second bucket elevator (7), a lump material bin (8), a raw material metering feeder (10), a preheater bin (11) and a vertical preheater (12). The first bucket elevator (1) can lift secondary aluminum ash to the raw material buffer bin (2). The secondary aluminum ash can sequentially fall downward from the bottom discharge port of the raw material buffer bin (2) to the briquetting machine (3), the roll crusher (4) and the vibrating screen (5). The vibrating screen (5) can screen the raw materials that have been briquetted by the briquetting machine (3) and crushed by the roll crusher (4). The vibrating screen (5) can convey the raw materials with unqualified particle sizes to the first bucket elevator (1) and lift them to the raw material buffer bin (2) again. The vibrating screen (5) can also convey the lump materials with qualified particle sizes to the belt conveyor (6). The belt conveyor (6) can convey the lump materials to the second bucket elevator (7). The second bucket elevator (7) can lift the lump materials to the lump material bin (8). A lump material bin rod valve (9) is provided at the bottom discharge port of the lump material bin (8). The lump materials can fall from the bottom of the lump material bin (8) through the lump material bin rod valve (9) to the raw material metering feeder (10). The raw material metering feeder (10) can convey the lump materials to the preheater bin (11). The vertical preheater (12) is installed on the top of the kiln tail box of the rotary kiln (13). The vertical preheater (12) can preheat the lump materials falling from the preheater bin (11) so that the preheated lump materials can enter the rotary kiln (13) from the top of the kiln tail box for calcination; The clinker processing system includes a single-cylinder cooler (14), a first water-cooled conveyor (18), a third bucket elevator (19), a clinker silo (20), a clinker metering feeder (21), a chain bucket conveyor (22), a vertical mill (23), a first cyclone dust collector (24), a recycle fan (26) and a powder conveyor (28). The inlet end of the single-cylinder cooler (14) is connected to the bottom of the kiln head box of the rotary kiln (13) so that the calcined clinker can enter the single-cylinder cooler (14) from the bottom of the kiln head box for cooling. The first water-cooled conveyor (18) can convey the clinker sent out from the outlet end of the single-cylinder cooler (14) to the third bucket elevator (19). The third bucket elevator (19) can lift the clinker to the clinker silo (20). The clinker can sequentially fall downward from the bottom discharge port of the clinker silo (20) to the clinker metering feeder (21) and the chain bucket conveyor (22). The chain bucket conveyor (22) can convey the clinker into the vertical mill (23) for grinding. The first cyclone dust collector (24) can collect the powder generated by the vertical mill (23) through the air separation power of the recycle fan (26). A first gravity valve (25) is provided at the bottom discharge port of the first cyclone dust collector (24). The powder can fall from the bottom of the first cyclone dust collector (24) through the first gravity valve (25) to the powder conveyor (28); The waste gas treatment system includes a second cyclone dust collector (31), a second water-cooled conveyor (33), an air-cooled cooler (34), a pneumatic conveying pump (35), a bag dust collector (36), a waste ash conveyor (37), a waste ash bin (38), a denitration tower (39), a high-temperature fan (40) and a chimney (41). The second cyclone dust collector (31) is connected to the top air outlet of the vertical preheater (12) so that the waste gas in the rotary kiln (13) enters the second cyclone dust collector (31) from the kiln tail box for primary dust removal. The second cyclone dust collector (31) can convey the waste gas into the air-cooled cooler (34) for cooling. The air-cooled cooler (34) can convey the waste gas into the bag dust collector (36) for secondary dust removal. The bag dust collector (36) can convey the waste gas into the denitration tower (39) for denitration treatment. The waste gas can be sent from the denitration tower (39) into the chimney (41) and discharged through the high-temperature fan (40). A second heavy hammer valve (32) is provided at the bottom discharge port of the second cyclone dust collector (31). The waste ash in the second cyclone dust collector (31) can fall into the second water-cooled conveyor (33) through the second heavy hammer valve (32). The second water-cooled conveyor (33) can convey the waste ash to the pneumatic conveying pump (35). The bottom discharge port of the air-cooled cooler (34) is connected to the pneumatic conveying pump (35) so that the waste ash in the air-cooled cooler (34) can fall into the pneumatic conveying pump (35). The pneumatic conveying pump (35) can convey the waste ash to the waste ash bin (38). The waste ash conveyor (37) is connected to the bottom discharge port of the bag dust collector (36) so that the waste ash in the bag dust collector (36) can fall into the waste ash conveyor (37). The waste ash conveyor (37) can convey the waste ash to the waste ash bin (38).

2. The secondary aluminum ash treatment system for resource utilization of aluminum ash according to claim 1, characterized in that: A cooler rod valve (17), a large material bin (15) and a counterattack crusher (16) are provided at the outlet end of the single-cylinder cooler (14). The clinker can fall from the outlet end of the single-cylinder cooler (14) to the first water-cooled conveyor (18) through the cooler rod valve (17). The large material bin (15) can receive the large pieces of clinker that cannot pass through the cooler rod valve (17). The large pieces of clinker can fall from the bottom discharge port of the large material bin (15) into the counterattack crusher (16) for crushing so that the crushed clinker can fall onto the first water-cooled conveyor (18) for conveying.

3. The secondary aluminum ash treatment system for resource utilization of aluminum ash according to claim 1, characterized in that: The air outlet of the circulating fan (26) is respectively connected to the vertical mill (23) and the single-unit dust collector (27) so that the powder-containing air flow sent by the circulating fan (26) can be conveyed to the vertical mill (23), and the powder-containing air flow sent by the circulating fan (26) can be dedusted by the single-unit dust collector (27). The bottom discharge port of the single-unit dust collector (27) is connected to the powder conveyor (28) so that the powder in the single-unit dust collector (27) can fall into the powder conveyor (28).

4. The secondary aluminum ash treatment system for resource utilization of aluminum ash according to claim 1, wherein: The kiln head box of the rotary kiln (13) is connected to the burner (29). The burner (29) is also connected to a Roots blower (30) for adjusting the flame shape.

5. The secondary aluminum ash treatment system for resource utilization of aluminum ash according to claim 1, wherein: The waste gas treatment system further includes an electric louver valve (42) for adjusting the air intake volume.

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