Secondary aluminum dross multi-stage continuous hydrolysis leaching process and system

Abstract

The application discloses a multi-section continuous hydrolysis leaching process and system of active components in secondary aluminum ash, and the system comprises a hydrolysis leaching module and a solid-liquid separation module, the solid-liquid separation module is used for carrying out solid-liquid separation on filtrate, the solid-liquid separation module comprises a separation tank and a centrifugal assembly, the centrifugal assembly comprises a rotating frame and a rotating cylinder, a plurality of filter screens are arranged on the surface of the rotating frame, an auger soft sheet is arranged on the inner side of the rotating frame, and a liquid phase treatment module and a solid phase treatment module are arranged. The auger soft sheet arranged vertically is used for transmitting the filtrate upwards, under the action of centrifugal force, a large amount of liquid phase filtrate is discharged through the filter screens, the liquid phase filtrate is discharged in a diffusion manner to the periphery, the filtering speed is greatly accelerated, more liquid phase filtrate is separated from the solid phase filtrate in the transmission process, and then the content of the liquid phase filtrate in the solid phase filtrate is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of industrial hazardous waste treatment, and particularly relates to a secondary aluminum ash multi-stage continuous hydrolysis leaching system and a use process of the secondary aluminum ash multi-stage continuous hydrolysis leaching system. BACKGROUND

[0002] Aluminum ash is industrial waste generated in the process of electrolytic aluminum or aluminum processing-melting processing, and can be generally divided into primary aluminum ash and secondary aluminum ash. The secondary aluminum ash is subjected to hydrolysis leaching reaction in a high-efficiency continuous multi-stage reactor by adding a regulator and a catalyst, and through precise regulation and control of process conditions such as reaction temperature and reaction time, active component catalytic intensified decomposition and rapid leaching of soluble salts are realized, so as to achieve the purpose of efficient separation of active components and soluble salt components.

[0003] After the hydrolysis reactant is washed with water, the filtrate filtered out contains extremely fine solid phase filter material, which needs to be subjected to solid-liquid separation treatment. In the prior art, the liquid phase filter material is removed by horizontal transmission and centrifugation to leave the solid phase filter material. However, the secondary aluminum ash is crushed and ground before hydrolysis, and the solid phase filter material left by this method still contains a large amount of liquid phase filter material in the form of mud and sand, which is still inconvenient to handle. SUMMARY

[0004] The application proposes the following technical scheme in view of the problem that the mud and sand-shaped solid phase filter material contains a large amount of liquid phase filter material in the prior art.

[0005] The secondary aluminum ash multi-stage continuous hydrolysis leaching system comprises:

[0006] A hydrolysis leaching module, which is used for hydrolysis reaction of crushed secondary aluminum ash and multiple water washing of the reactant after reaction to filter out qualified inorganic aggregates;

[0007] A solid-liquid separation module, which is used for solid-liquid separation of the filtrate, and comprises a separation tank and a centrifugal assembly, the centrifugal assembly comprises a rotating frame and a rotating cylinder, one end of the rotating cylinder is rotatably inserted into the separation tank, and the end of the rotating cylinder is connected with the output end of an external motor through a belt, the surface of the rotating frame is provided with a plurality of filter screens, and the inner side of the rotating frame is provided with an auger soft sheet;

[0008] A liquid phase treatment module, which is used for evaporation treatment of the liquid phase filter material to obtain mixed salt;

[0009] A solid phase treatment module, which is used for drying treatment of the solid phase filter material to obtain high-purity aluminum oxide material.

[0010] As the preferred of the above technical scheme, the solid-liquid separation module further comprises a filter pressing assembly, the filter pressing assembly comprises an extrusion ring and an extrusion sheet, the extrusion ring and the extrusion sheet are respectively provided with a connecting frame and a connecting rod, and the connecting frame and the connecting rod are respectively connected with the output ends of the driving member one and the driving member two.

[0011] As the preferred of the above technical scheme, the rotating frame and the auger soft sheet are provided with a support, the support comprises a plurality of support sheets, and the support sheets are fixedly connected with elastic blocks between the rotating frame.

[0012] As the preferred of the above technical scheme, the separation tank is provided with a top cover at the top, and the top cover is opened by an external power mechanism so that the solid phase filter is separated.

[0013] As the preferred of the above technical scheme, the separation tank is provided with a liquid discharge pipe at one side, and the liquid discharge pipe discharges the liquid phase filter from the separation tank.

[0014] As the preferred of the above technical scheme, the separation tank is provided with a liquid guide plate inside, and the rotating cylinders are rotationally sealed between the liquid guide plates.

[0015] As the preferred of the above technical scheme, the rotating cylinder is provided with a turning portion at the bottom, and the turning portion is rotationally sealed with the top of the rotating cylinder.

[0016] The use process of the multi-stage continuous hydrolysis leaching system for secondary aluminum ash comprises the following steps,

[0017] S1, the crushed secondary aluminum ash is put into the hydrolysis leaching module, and then the adjusting agent, the catalyst and a large amount of water are added for hydrolysis reaction;

[0018] S2, after the reaction is completed, the slurry is filtered and washed several times with clean water, and then the filtrate and the inorganic aggregate are separated, whether the inorganic aggregate meets the environmental protection requirements is detected, and if not, the hydrolysis reaction is re-performed;

[0019] S3, the filtrate enters the solid-liquid separation module, and the centrifugal assembly is rotated under the action of the centrifugal force to separate the filtrate into solid and liquid;

[0020] S4, the liquid phase filter and the solid phase filter are treated through the liquid phase treatment module and the solid phase treatment module respectively, the solid phase filter is dried to obtain high-purity aluminum oxide material, and the liquid phase filter is evaporated and crystallized to obtain mixed salt.

[0021] The beneficial effects of the present application are:

[0022] 1. The filtrate is transported upward by a vertically set auger plate. Under the action of centrifugal force, a large amount of liquid filter material is discharged through the filter screen. The liquid filter material is discharged in a diffuse manner, which greatly accelerates the filtration speed. This allows more liquid filter material to be separated from the solid filter material during the upward transport process, thereby reducing the content of liquid filter material in the solid filter material.

[0023] 2. The solid filter material is squeezed into a cake shape by a closed plate composed of assembled filter press components, which greatly reduces the liquid content in the solid filter material and facilitates the collection of solid filter material by external mechanisms. At the same time, the filter press components can be disassembled, so that the entry of filtrate is not affected when not in operation and the transport of solid filter material is not affected when reset.

[0024] 3. The support components provided can support the auger sheet, enabling it to properly transport the solid filter material. At the same time, it can automatically retract when the filter press assembly passes by, facilitating the shrinkage of the auger sheet without affecting the movement of the filter press assembly. Attached Figure Description

[0025] Figure 1 The diagram shown is a schematic representation of the overall structure in the embodiment.

[0026] Figure 2 The diagram shown is a front sectional view of the separation tank in the embodiment;

[0027] Figure 3 The diagram shown is a front sectional view of the centrifuge assembly in the embodiment;

[0028] Figure 4 The diagram shown is a schematic representation of the installation of the support member in the embodiment;

[0029] Figure 5 The image shown is a front view of the filter press assembly in the embodiment.

[0030] In the diagram: 10. Separation tank; 21. Rotating frame; 22. Rotating cylinder; 23. Filter screen; 24. Screwdriver sheet; 31. Extrusion ring; 32. Extrusion plate; 33. Connecting frame; 34. Connecting rod; 35. Drive component one; 36. Drive component two; 41. Support plate; 42. Elastic block; 50. Top cover; 60. Drain pipe; 70. Guide plate; 80. Turning part. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0032] Example

[0033] Figures 1-3 The secondary aluminum ash multi-stage continuous hydrolysis leaching system includes:

[0034] a hydrolysis leaching module for carrying out a hydrolysis reaction on the crushed secondary aluminum ash and washing the reaction product with water for several times to filter out qualified inorganic aggregates after the reaction is completed;

[0035] a solid-liquid separation module for carrying out solid-liquid separation on the filtrate, which comprises a separation tank 10 and a centrifugal assembly, the centrifugal assembly comprising a rotating frame 21 and a rotating cylinder 22, one end of the rotating cylinder 22 being rotatably inserted into the inside of the separation tank 10, and the end of the rotating cylinder 22 being connected to the output end of an external motor through a belt, the surface of the rotating frame 21 being provided with a plurality of filter screens 23, and the inside of the rotating frame 21 being provided with an auger soft sheet 24;

[0036] a liquid phase treatment module for carrying out evaporation treatment on the liquid phase filtrate to obtain mixed salt;

[0037] a solid phase treatment module for carrying out drying treatment on the solid phase filtrate to obtain high-purity aluminum oxide material.

[0038] When the hydrolysis reaction is carried out, the crushed secondary aluminum ash is put into the hydrolysis leaching module, and then a large amount of water, a regulator and a catalyst are added to carry out the hydrolysis reaction, while the inside of the hydrolysis leaching module is stirred to accelerate the hydrolysis reaction speed. After the reaction is completed, the slurry is filtered and washed with clean water for several times, and then filtered to separate the filtrate and the inorganic aggregates. The inorganic aggregates are taken out to detect whether they meet the environmental protection requirements. If not, the inorganic aggregates are put into the hydrolysis leaching module again to carry out the hydrolysis reaction. At the same time, the gas generated in the hydrolysis reaction and the washing process is absorbed and treated by an external treatment mechanism. The filtrate enters the rotating frame 21 from the bottom of the rotating cylinder 22. The external motor drives the rotating cylinder 22 and the rotating frame 21 to rotate through a belt. Under the action of centrifugal force, the liquid phase filtrate passes through the filter screen 23 into the separation tank 10, while the solid phase filtrate is transported upward along the auger soft sheet 24. Then the liquid phase filtrate and the solid phase filtrate are treated by the liquid phase treatment module and the solid phase treatment module respectively. The solid phase filtrate is dried to obtain high-purity aluminum oxide material, and the liquid phase filtrate is evaporated and crystallized to obtain mixed salt.

[0039] The auger soft sheet 24 is vertically arranged to transport the filtrate upward. Under the action of centrifugal force, a large amount of liquid phase filtrate is discharged through the filter screen 23. The liquid phase filtrate is discharged in a diffusion manner to the surrounding, which greatly accelerates the filtering speed, so that more liquid phase filtrate is separated from the solid phase filtrate during the upward transportation of the solid phase filtrate, thereby reducing the content of the liquid phase filtrate in the solid phase filtrate.

[0040] The use process of the secondary aluminum ash multi-stage continuous hydrolysis leaching system comprises the following steps,

[0041] S1, the broken secondary aluminum ash is put into a hydrolysis leaching module, and then a regulator, a catalyst and a large amount of water are added for hydrolysis reaction;

[0042] S2, after the reaction is completed, the slurry is filtered and washed several times with clean water, and then the filtrate and inorganic aggregate are separated, and whether the inorganic aggregate meets the environmental protection requirements is detected, and if not, the hydrolysis reaction is performed again;

[0043] S3, the filtrate enters into a solid-liquid separation module, and a centrifugal component rotates to separate the filtrate under the action of centrifugal force;

[0044] S4, the liquid phase filter and the solid phase filter are treated by a liquid phase treatment module and a solid phase treatment module respectively, the solid phase filter is dried to obtain high-purity alumina material, and the liquid phase filter is evaporated and crystallized to obtain mixed salt.

[0045] In the process technology scheme of the secondary aluminum ash multi-stage continuous hydrolysis leaching system, the secondary aluminum ash is treated by a secondary aluminum ash wet treatment process, active components are catalytically strengthened and decomposed, and soluble salts are rapidly leached, so that the active components and the soluble salt components are efficiently separated.

[0046] Figure 2 And Figure 5 In the process technology scheme of the secondary aluminum ash multi-stage continuous hydrolysis leaching system, the secondary aluminum ash wet treatment process is used to treat the secondary aluminum ash, the active components are catalytically strengthened and decomposed, and the soluble salts are rapidly leached, so that the active components and the soluble salt components are efficiently separated.

[0047] The top of the separation tank 10 is provided with a top cover 50, and the top cover 50 is opened by an external power mechanism so that the solid phase filter leaves.

[0048] Before the centrifugal assembly works, the extrusion ring 31 and the extrusion sheet 32 are at the bottom of the rotating frame 21, and the extrusion sheet 32 is below the extrusion ring 31, and the filtrate normally passes from the outside of the extrusion sheet 32 and the inside of the extrusion ring 31, and after the solid-phase filter accumulates to a certain amount in the centrifugal assembly, the driving part two 36 starts to drive the connecting rod 34 to move before the driving part one 35 starts, and when the extrusion sheet 32 contacts the extrusion ring 31, the driving part one 35 starts to drive the extrusion sheet 32 to move through the connecting frame 33, and the extrusion sheet 32 and the extrusion ring 31 form a complete closed plate, which extrudes and deforms the auger soft sheet 24 and pushes the solid-phase filter upward during the upward movement of the closed plate, and under the action of the closed plate and the top cover 50, the solid-phase filter is extruded into a round cake shape, and at this time, the solid-phase filter in the round cake shape contains almost no liquid-phase filter, and then the top cover 50 is opened to make the closed plate push the solid-phase filter away, and the external pushing device takes down the solid-phase filter and closes the top cover 50, and then the driving part two 36 resets before the driving part one 35, the closed plate is reopened, and a certain space is formed in the middle of the extrusion sheet 32 and the extrusion ring 31, and during the resetting process, the solid-phase filter can normally transmit upward through the extrusion sheet 32 and the extrusion ring 31.

[0049] The closed plate composed of the assembled filter-pressing assembly extrudes the solid-phase filter into a cake shape, greatly reduces the content of the liquid-phase filter in the solid-phase filter, and also facilitates the external mechanism to collect the solid-phase filter, and meanwhile, the filter-pressing assembly can be disassembled, which does not affect the entry of the filtrate when not working and does not affect the transmission of the solid-phase filter when resetting.

[0050] Figures 3-4 In the centrifugal assembly, a support part is arranged between the rotating frame 21 and the auger soft sheet 24, and the support part includes a plurality of support sheets 41, and elastic blocks 42 are fixedly connected between the support sheets 41 and the rotating frame 21.

[0051] When the auger soft sheet 24 is extruded by the filter-pressing assembly, the support sheets 41 are withdrawn into the rotating frame 21, and the elastic blocks 42 are compressed, and after the filter-pressing assembly leaves, the elastic blocks 42 reset to reset the support sheets 41, and the auger soft sheet 24 is withdrawn to the original position.

[0052] The arranged support part can provide support for the auger soft sheet 24, so that the auger soft sheet 24 can normally transmit the solid-phase filter, and can automatically withdraw when the filter-pressing assembly passes, which facilitates the contraction of the auger soft sheet 24 and does not affect the movement of the filter-pressing assembly.

[0053] Figures 1-2 In the centrifugal assembly, a support part is arranged between the rotating frame 21 and the auger soft sheet 24, and the support part includes a plurality of support sheets 41, and elastic blocks 42 are fixedly connected between the support sheets 41 and the rotating frame 21.

[0054] The inside of the separation tank 10 is provided with a liquid guide plate 70, and the rotating cylinder 22 is rotationally sealed between the liquid guide plates 70.

[0055] The liquid guide plate 70 is arranged to make the filter assembly position higher than the water level of the liquid filtrate, and to guide the discharged liquid filtrate to the bottom of the separation tank 10, so that the content of the liquid filtrate in the filtrate is more than 98%, and the transmission of the solid filtrate is not affected by the failure of the liquid filtrate to be discharged from the liquid discharge pipe 60 in time.

[0056] Figure 1 In the embodiment, the bottom of the rotating cylinder 22 is provided with a turning part 80, and the top of the turning part 80 is rotationally sealed with the top of the rotating cylinder 22.

[0057] The turning part 80 can turn the water inlet pipe, and reserve installation positions for the driving member one 35 and the driving member two 36. Meanwhile, the turning part 80 is rotationally sealed with the rotating cylinder 22, so that the filtrate cannot flow out.

[0058] Working principle of the solid-liquid separation module:

[0059] The external filtrate enters the turning part 80, and then enters the rotating frame 21 through the bottom of the rotating cylinder 22. Then, the external motor drives the rotating cylinder 22 and the rotating frame 21 to rotate through the belt. Under the action of centrifugal force, the liquid filtrate enters the separation tank 10 through the filter screen 23. Part of the liquid filtrate splashes to the inner wall surface of the separation tank 10. The liquid filtrate falls to the bottom of the separation tank 10 along the inner wall surface of the separation tank 10. A small part of the liquid filtrate flows to the bottom of the separation tank 10 along the liquid guide plate 70. The solid filtrate is transported upward along the auger soft sheet 24.

[0060] When the solid filtrate is accumulated to a certain amount in the centrifugal assembly, the driving member two 36 is started to drive the connecting rod 34 to move before the driving member one 35. When the pressing sheet 32 contacts the pressing ring 31, the driving member one 35 is started to drive the pressing sheet 32 to move through the connecting frame 33. The pressing sheet 32 and the pressing ring 31 form a complete closed plate. The closed plate deforms the auger soft sheet 24 and pushes the solid filtrate upward during the movement of the closed plate. When the auger soft sheet 24 is pressed by the pressing assembly, the supporting sheet 41 is retracted into the rotating frame 21, and the elastic block 42 is compressed. After the pressing assembly leaves, the elastic block 42 resets the supporting sheet 41, and the auger soft sheet 24 is reset to the original position.

[0061] Under the action of the closed plate and the top cover 50, the solid filtrate is pressed into a round cake shape. At this time, the solid filtrate in the round cake shape contains almost no liquid filtrate. Then, the top cover 50 is opened to make the closed plate push the round cake-shaped solid filtrate away. The external pushing device takes down the solid filtrate and closes the top cover 50. Then, the driving member two 36 is reset before the driving member one 35. The closed plate is opened again. A certain space is formed in the middle of the pressing sheet 32 and the pressing ring 31. During the resetting process, the solid filtrate can normally be transmitted upward through the pressing sheet 32 and the pressing ring 31.

[0062] The above examples are only used to illustrate the technical solutions of the present application, and not to limit them.

Claims

1. A multi-stage continuous hydrolysis leaching system for secondary aluminum dross, characterized by, It comprises: a hydrolysis leaching module for carrying out a hydrolysis reaction on crushed secondary aluminum ash and washing the reaction product multiple times after the reaction is completed to filter out qualified inorganic aggregates; a solid-liquid separation module for carrying out solid-liquid separation on the filtrate, which comprises a separation tank (10) and a centrifugal assembly comprising a rotating frame (21) and a rotating cylinder (22), one end of the rotating cylinder (22) being rotatably inserted into the separation tank (10), and the end of the rotating cylinder (22) being connected to the output end of an external motor through a belt, the surface of the rotating frame (21) being provided with a plurality of filter screens (23), and the inner side of the rotating frame (21) being provided with an auger soft sheet (24); a liquid phase treatment module for evaporating and treating the liquid phase filtrate to obtain mixed salt; a solid phase treatment module for drying and treating the solid phase filtrate to obtain high-purity aluminum oxide material; The solid-liquid separation module further comprises a filter pressing assembly comprising a pressing ring (31) and a pressing sheet (32), the bottom of the pressing ring (31) and the pressing sheet (32) being respectively provided with a connecting frame (33) and a connecting rod (34), the other end of the connecting frame (33) and the connecting rod (34) being respectively connected to the output end of a driving member one (35) and a driving member two (36); A support is arranged between the rotating frame (21) and the auger soft sheet (24), and the support comprises a plurality of support sheets (41), and elastic blocks (42) are fixedly connected between the support sheets (41) and the rotating frame (21).

2. The multi-stage continuous hydrolysis leaching system of secondary aluminum dross according to claim 1, characterized in that, A top cover (50) is arranged on the top of the separation tank (10), and the top cover (50) is opened by an external power mechanism to make the solid phase filtrate leave.

3. The multi-stage continuous hydro-extraction system for secondary aluminum dross according to claim 1, wherein, A liquid discharge pipe (60) is arranged on one side of the separation tank (10), and the liquid discharge pipe (60) discharges the liquid phase filtrate from the separation tank (10).

4. The multi-stage continuous hydrolysis leaching system of spent potliner according to claim 1, wherein, A liquid guide plate (70) is arranged inside the separation tank (10), and the rotating cylinder (22) is rotatably sealed between the liquid guide plates (70).

5. The multi-stage continuous hydro-extraction system for secondary aluminum dross according to claim 1, wherein, A turning portion (80) is arranged at the bottom of the rotating cylinder (22), and the top of the turning portion (80) is rotatably sealed with the top of the rotating cylinder (22).

6. The process for using the multi-stage continuous hydrolysis leaching system of secondary aluminum dross according to any one of claims 1-5, characterized in that, The method comprises the following steps: S1, putting the crushed secondary aluminum ash into the hydrolysis leaching module, then adding the adjusting agent, catalyst and a large amount of water to carry out the hydrolysis reaction; S2, after the reaction is completed, filtering the slurry and washing it with clean water for several times, then separating the filtrate and the inorganic aggregate, and detecting whether the inorganic aggregate meets the environmental protection requirements, if not, re-performing the hydrolysis reaction; S3, the filtrate enters the solid-liquid separation module, and the centrifugal assembly rotates under the action of centrifugal force to carry out solid-liquid separation on the filtrate; S4, the liquid phase filtrate and the solid phase filtrate are treated by the liquid phase treatment module and the solid phase treatment module respectively, the solid phase filtrate is dried to obtain high-purity aluminum oxide material, and the liquid phase filtrate is evaporated and crystallized to obtain mixed salt.

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