Comprehensive treatment system for aluminum ash and fly ash containing lime

Abstract

The utility model belongs to the technical field of comprehensive treatment and recycling of waste resources, and particularly relates to a comprehensive treatment system for aluminum ash and fly ash containing lime, which comprises a fluorine removal device and a calcium removal device, the defluorination device comprises a feeding device, a feed hopper, a first iron remover, a first drum screen, a first stock bin, a large ball mill, a second iron remover, a second drum screen, a second stock bin, a small ball mill and a third drum screen which are sequentially arranged, and materials screened out by the first drum screen, the second drum screen and the third drum screen are conveyed to a semi-finished product ash bin. A vibrating screen, a batching tank and a calcium removal device are sequentially arranged at the discharging end of the semi-finished ash bin; scrap iron hoppers are arranged below the first iron remover and the second iron remover; and a waste hopper is arranged below the vibrating screen. According to the device, fly ash mixed with lime and aluminum ash are fully mixed, ground and screened, then slurry is prepared, precipitates such as calcium fluoride and the like are filtered out so as to remove soluble fluorine in the aluminum ash, and then the screened material is continuously treated through a wet ash treatment process.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive treatment and reuse of waste resources, and in particular relates to a comprehensive treatment system for aluminum ash and dust removal ash containing lime. Background Art

[0002] The rotary kiln that processes aluminum ash particles produces a large amount of dust during the production process, and sulfur dioxide pollutes the air. Before discharge, it must be purified by bag dust removal. In order to protect the bags and remove sulfur dioxide, lime must be added to the bags, resulting in the dust collected by the bag dust removal containing a large amount of lime (about 25% calcium hydroxide), sodium chloride and potassium chloride content of about 10%, and aluminum nitride of about 4%. At present, the treatment of dust ash containing lime requires special equipment, which is costly and troublesome to handle.

[0003] At the same time, the commonly used method for aluminum ash recovery and treatment is aluminum ash hydrolysis, wherein aluminum ash hydrolysis obtains aluminum ash slurry, and the aluminum ash slurry is filtered to remove impurities to obtain concentrated brine, which can then be passed into an MVR evaporator to obtain crystalline salt after treatment in the MVR evaporator.

[0004] In the current aluminum ash treatment process, since aluminum ash contains a large amount of fluoride ions that are dissolved in concentrated brine, if it enters the MVR directly without treatment, it will cause corrosion and damage to the MVR equipment. The fluoride ions contained in the aluminum ash cannot be effectively removed, resulting in the need for regular maintenance or replacement of the MVR equipment. Summary of the invention

[0005] The utility model aims to solve the problems that the treatment of the existing rotary furnace dust removal ash is troublesome and costly, and the fluorine ions therein cannot be effectively treated during the treatment of the aluminum ash, which easily leads to corrosion and damage of the MVR equipment. The utility model provides an aluminum ash and a dust removal ash comprehensive treatment system containing lime. The dust removal ash mixed with lime is fully mixed, ground and screened with the aluminum ash, and then mixed with water to react to form a slurry, and the precipitation of calcium fluoride and the like in the slurry is filtered out to remove the soluble fluorine in the aluminum ash. Then, the screened material is treated by a wet aluminum ash removal process, so as to realize the comprehensive treatment of the dust removal ash and the aluminum ash, and effectively reduce the treatment costs of the dust removal ash and the aluminum ash.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A comprehensive treatment system for aluminum ash and dust removal ash containing lime, including a defluorination device and a decalcification device, the defluorination device includes a loading device, a feed hopper, a first iron remover, a first drum screen, a first silo, a large ball mill, a second iron remover, a second drum screen, a second silo, a small ball mill, and a third drum screen which are arranged in sequence, the materials screened out by the first drum screen, the second drum screen, and the third drum screen are transported to a semi-finished ash silo, and a vibrating screen, a batching tank, and a decalcification device are arranged in sequence at the discharge end of the semi-finished ash silo; a scrap iron hopper is arranged below the first and second iron removers, and a scrap hopper is arranged below the vibrating screen, the metal impurities in the material are removed by the first and second iron removers, the material with a larger particle size is screened out by the drum screen, the material is ground and crushed by the large ball mill and the small ball mill, and then the material with a smaller particle size is screened out by multiple drum screens, and then the material with a corresponding particle size is screened out by the vibrating screen for subsequent treatment.

[0008] Preferably, the feeding device includes multiple storage barrels, a conical discharge cloth is arranged at the lower end of the storage barrel, the discharge ports at the lower end of the discharge cloth are arranged corresponding to the feed hopper, a rope is sleeved at the lower end of the discharge cloth, both ends of the rope extend out of the discharge cloth, and aluminum ash and dust ash are respectively arranged in the multiple storage barrels, and the size of the discharge port of the discharge cloth is adjusted by pulling out the length of the rope to realize the control of materials with different feed ratios.

[0009] Preferably, the rope is provided with a scale to facilitate observation of the pulled-out length of the rope.

[0010] Preferably, the rope is stretched out to a corresponding length of the discharge cloth and then tied and fixed, so as to adjust the size of the discharge port of the discharge cloth. By controlling the different lengths of the rope, the feed ratio of different materials can be adjusted, which is convenient and effective.

[0011] Preferably, bucket elevators are provided between the feed port and the first iron remover, between the first drum screen and the first silo, between the large ball mill and the second iron remover, and between the second drum screen and the second silo to ensure smooth material transportation.

[0012] Preferably, the decalcification device includes a reaction tank and a brine decalcification device, the batching tank is connected to the reaction tank, the brine decalcification device is used to remove calcium from the slurry output from the reaction tank, the screened material is mixed and stirred with water into a slurry through the reaction tank, and then the calcium therein is removed by the brine decalcification device.

[0013] Through the above technical solution, the beneficial effects of the utility model are:

[0014] The utility model obtains fine powder with smaller particle size by mixing, stirring and grinding aluminum ash and dust ash (containing lime) for subsequent treatment. In the process, fluorine is removed from the dust ash by reacting with the aluminum ash. On the one hand, the hazardous waste dust ash is reused. On the other hand, the corrosion damage to the MVR equipment caused by the high fluorine content during the aluminum ash treatment process is effectively avoided. Moreover, the aluminum ash and dust ash mixture after grinding and screening is mixed with water in a reaction tank to form a slurry, and then the calcium therein is treated, thereby realizing the simultaneous recovery and utilization of the dust ash and the aluminum ash, and effectively reducing the waste treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the working process of the system of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the feeding device of the utility model.

[0017] The numbers in the accompanying drawings are: 1 is the feed inlet, 2 is the first iron remover, 3 is the first drum screen, 4 is the first silo, 5 is the large ball mill, 6 is the second iron remover, 7 is the second drum screen, 8 is the second silo, 9 is the small ball mill, 10 is the third drum screen, 11 is the semi-finished product ash silo, 12 is the vibrating screen, 13 is the reaction tank, 14 is the batching tank, 15 is the scrap iron bucket, 16 is the scrap hopper, 17 is the storage barrel, 18 is the discharge cloth, and 19 is the rope. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0019] like Figure 1-2As shown, this embodiment provides a comprehensive treatment system for aluminum ash and dust removal ash containing lime, which is used for treating and recycling dust removal ash containing lime and aluminum ash, including a defluorination device and a decalcification device. The defluorination device includes a feeding device, a feeding hopper 1, a first iron remover 2, a first drum screen 3, a first silo 4, a large ball mill 5, a second iron remover 6, a second drum screen 7, a second silo 8, a small ball mill 9, and a third drum screen 10, which are arranged in sequence. Aluminum ash and dust removal ash are added to the feeding hopper 1 in a ratio of 10:1 through the feeding device, and then the material is transported to the first iron remover 2 to remove metal impurities therein (aluminum ash is usually mixed with impurities such as iron nails and screws), and then through the first The drum screen 3 screens the mixed material, and the screened materials with larger particle sizes enter the first silo 4 for transfer and then enter the large ball mill 5 for preliminary grinding and crushing of the materials. Then the materials enter the second iron remover 6 from the large ball mill 5. During the grinding process, a part of the wrapped metal impurities are broken and exposed, and then screened and separated by the second iron remover 6. Then the materials are transported to the second drum screen 7. After the screening is completed, the materials with larger particle sizes are transferred through the second silo 8 and transported to the small ball mill 9 for further grinding and crushing. The crushed materials are screened again by the third drum screen 10. After screening, only residual metal aluminum blocks and other recyclable materials are left in the third drum screen 10 for recycling.

[0020] The materials screened out by the first drum screen 3, the second drum screen 7 and the third drum screen 10 are transported to the semi-finished product ash bin 11, and the fine materials screened out by the first drum screen 3, the second drum screen 7 and the third drum screen 10 are all transported through pipelines. The pipelines cooperate with the Roots blower to realize pressure transportation, and the screened fine materials are transported to the semi-finished product ash bin 11. The discharge end of the semi-finished product ash bin 11 is sequentially provided with a vibrating screen 12, a batching tank 14 and a decalcification device. The materials in the semi-finished product ash bin 11 enter the vibrating screen 12 through the discharge port, and are screened again to effectively ensure the material particle size required for the subsequent reaction. After the screening is completed, the qualified materials with smaller particle size are sent to the batching tank 14 for batching, and then enter the decalcification device.

[0021] The feeding device includes a plurality of storage barrels 17, wherein two storage barrels 17 are provided, and aluminum ash and dust removal ash with lime are respectively contained in the two storage barrels 17. A conical discharge cloth 18 is provided at the lower end of the storage barrel 17, and the discharge port at the lower end of the discharge cloth 18 is provided corresponding to the feed hopper 1. The material in the storage barrel 17 falls into the feed hopper 1 through the discharge cloth 18. A rope 19 is sleeved at the lower end of the discharge cloth 18, and both ends of the rope 19 extend out of the discharge cloth 18. The rope 19 is tied and fixed after extending out of the discharge cloth 18 by a corresponding length, so as to adjust the size of the discharge port of the discharge cloth 18, and then control the discharge amount of the two storage barrels 17 when discharging. The rope 19 is provided with a scale, and the extension amount of the rope 19 is convenient to adjust by observing the scale, so as to realize the control of the size of the discharge port of the discharge cloth 18.

[0022] As an implementable embodiment, the feeding device is a feeder, and the feeding is completed by the feeder. The material is weighed before feeding to ensure the feeding ratio.

[0023] A scrap iron bucket 15 is provided below the first iron remover 2 and the second iron remover 6, and the metal impurities separated from the material by the first iron remover 2 and the second iron remover 6 fall into the scrap iron bucket 15. A waste hopper 16 is provided below the vibrating screen 12, and unqualified materials screened out by the vibrating screen 16 fall into the waste hopper 16.

[0024] Bucket elevators are provided between the feed hopper 1 and the first iron remover 2, between the first drum screen 3 and the first silo 4, between the large ball mill 5 and the second iron remover 6, and between the second drum screen 7 and the second silo 8, and the bucket elevators are used to ensure the transportation of materials between different heights.

[0025] The decalcification device includes a reaction tank 13 and a brine decalcification device, and the brine decalcification device is used to remove calcium in the slurry output from the reaction tank 13. The batching tank 14 is connected to the reaction tank 13, and the material is mixed and stirred with water in the reaction tank 14 to react to generate a mixed slurry. In this process, most of the soluble fluorine in the aluminum ash reacts with the lime in the dust removal ash to generate calcium fluoride precipitate, and the slurry is pumped to a vacuum belt filter. The calcium fluoride precipitate and other precipitates in the slurry are filtered and removed by the vacuum belt filter. The obtained concentrated brine containing ash and soluble calcium is processed by the brine decalcification device. The brine decalcification device adopts an aluminum ash recovery brine decalcification device with patent publication number CN219010103U to achieve the removal of calcium in the slurry, and can also be achieved by other existing technologies that can achieve soluble calcium treatment.

[0026] When in use, aluminum ash and dust removal ash are added to the feed hopper 1 in a ratio of 10:1 through the feeding device, and then the material is transported to the first iron remover 2 to remove metal impurities (aluminum ash is usually mixed with some impurities such as iron nails and screws), and then the mixture is screened by the first drum screen 3, and the screened materials with larger particle sizes enter the first silo 4 for transfer and then enter the large ball mill 5 for preliminary grinding and crushing of the material, and then the material enters the second iron remover 6 from the large ball mill 5. During the grinding process of the material, a part of the wrapped metal impurities are broken and exposed, and then screened and separated by the second iron remover 6, and then the material is transported to the second drum screen 7. After the screening is completed, the materials with larger particle sizes are transferred through the second silo 8 and transported to the small ball mill 9 for grinding and crushing again. The crushed materials are screened again by the third drum screen 10. After screening, only residual metal aluminum blocks and other recyclable materials are left in the third drum screen 10 for recycling.

[0027] The fine materials screened out by the first drum screen 3, the second drum screen 7 and the third drum screen 10 are all transported to the semi-finished product ash bin 11 through a pipeline. The materials in the semi-finished product ash bin 11 enter the vibrating screen 12 through the discharge port and are screened again to effectively ensure the material particle size required for the subsequent reaction. After the screening is completed, the qualified materials with smaller particle sizes are sent to the batching tank 14 for batching, and then enter the reaction tank 14. After the slurry is reacted in the reaction tank 14 to form slurry, the calcium fluoride and other precipitates in the slurry are filtered, and then the soluble calcium is removed through the brine decalcification device to complete the treatment of dust ash and aluminum ash.

[0028] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A comprehensive treatment system for aluminum ash and dust removal ash containing lime, characterized in that: The invention comprises a defluorination device and a decalcification device, wherein the defluorination device comprises a feeding device, a feeding hopper (1), a first iron remover (2), a first drum screen (3), a first silo (4), a large ball mill (5), a second iron remover (6), a second drum screen (7), a second silo (8), a small ball mill (9), and a third drum screen (10) which are arranged in sequence, wherein the materials screened out by the first drum screen (3), the second drum screen (7), and the third drum screen (10) are transported to a semi-finished product ash silo (11), and a vibrating screen (12), a batching tank (14), and a decalcification device are arranged in sequence at the discharge end of the semi-finished product ash silo (11); A scrap iron hopper (15) is provided below the first iron remover (2) and the second iron remover (6), and a waste material hopper (16) is provided below the vibrating screen (12).

2. A comprehensive treatment system for aluminum ash and dust ash containing lime according to claim 1, characterized in that: The loading device comprises a plurality of storage barrels (17), a conical discharge cloth (18) is arranged at the lower end of the storage barrel (17), the discharge ports at the lower ends of the discharge cloth (18) are arranged corresponding to the feed hopper (1), and a rope (19) is sleeved at the lower end of the discharge cloth (18), and both ends of the rope (19) extend out of the discharge cloth (18).

3. A comprehensive treatment system for aluminum ash and dust ash containing lime according to claim 2, characterized in that: The rope (19) is provided with scales.

4. The integrated treatment system for aluminum ash and dust ash containing lime according to claim 2 is characterized in that: The rope (19) is tied and fixed after extending out of the discharge cloth (18) by a corresponding length, thereby adjusting the size of the discharge opening of the discharge cloth (18).

5. The integrated treatment system for aluminum ash and dust ash containing lime according to claim 1, characterized in that: Bucket elevators are provided between the feed hopper (1) and the first iron remover (2), between the first drum screen (3) and the first silo (4), between the large ball mill (5) and the second iron remover (6), and between the second drum screen (7) and the second silo (8).

6. The integrated treatment system for aluminum ash and dust ash containing lime according to claim 1, characterized in that: The decalcification device comprises a reaction tank (13) and a salt water decalcification device. The batching tank (14) is connected to the reaction tank (13). The salt water decalcification device removes calcium from the slurry output from the reaction tank (13).

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