Leaching reaction tank for aluminum overhaul slag

Abstract

The utility model discloses an aluminum overhaul slag leaching reaction tank, which relates to the technical field of electrolytic aluminum overhaul slag leaching equipment, and comprises a tank body, a stirring device is fixed at the top of the tank body, a stirring shaft is arranged in the stirring device, a plurality of stirring blades are connected onto the stirring shaft, the upper part close to the stirring shaft is an expanded spiral-flow type paddle, and the bottom of the stirring shaft is a variable cross-section type paddle. The spiral-flow type paddle and the variable cross-section type paddle are coaxially arranged, so that the mixing uniformity of materials is effectively improved, and the problem that an existing leaching tank is poor in material mixing capacity is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic aluminium overhaul slag leaching equipment technical field, especially a kind of aluminium overhaul slag leaching reaction tank. BACKGROUND

[0002] The waste overhaul slag (referred to as aluminium overhaul slag) generated by electrolytic aluminium tank maintenance is crushed and ground into powder material of about-200 mesh, which needs to be alkali leached / acid leached. About 30% liquid alkali is used for alkali leaching, and more than 93% concentrated sulfuric acid is used for acid leaching. The leaching is carried out in a reaction tank, and lithium sulfate is produced by reaction. After impurity removal, lithium precipitation and other processes, lithium carbonate is prepared.

[0003] After the material is leached, the ore pulp solid content is about 20% to 30%, the ore pulp specific gravity is about 1.1 to 1.2 t / m3, the reaction temperature is 80 to 90℃, and the pressure is normal. The corrosion condition (when alkali leaching) contains NaOH 82g / L, F ion 7-9g / L; (when alkali leaching) contains H2SO4 5-50g / L, F ion 0.5-3g / L. A certain amount of CH4, H2 and a small amount of HF gas are also produced in the leaching process.

[0004] Currently, in the production process, the material in the reaction tank is not mixed uniformly, and the reaction efficiency is low. In addition, after the reaction tank runs for a long time, the corrosion is serious, and it often needs to stop work, rebrick, which affects the production efficiency. The generated gas is easy to explode and other phenomena.

[0005] In the prior art, a kind of high-purity lithium carbonate preparation is prepared with corrosion-resistant leaching tank with the patent publication number CN222540842U, including leaching processing tank, leaching processing tank is internally provided with stirring assembly, protection cover upper end is provided with liquid guide component, in the preparation process of high-purity lithium carbonate, make low-speed motor rotate vertical shaft rotation through driving bevel gear and driven bevel gear, and rotating vertical shaft will drive stirring horizontal bar and stirring vertical bar low-speed rotation to the lithium ore powder in the leaching processing tank is stirred, only through ordinary stirring in the comparative document, material is not mixed uniformly. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the poor material mixing capacity of existing leaching tank, and provides a kind of aluminium overhaul slag leaching reaction tank with acid and alkali resistance, fluoride ion resistance, which is beneficial to improve material mixing uniformity, good airtightness, good safety and prolong service life by setting a plurality of stirring blades, including spread cyclone paddle and variable cross-section paddle.

[0007] To achieve the above object, the utility model provides the following technical scheme: an aluminium overhaul slag leaching reaction tank, including the tank body, the top of tank body is fixed with stirring device, the stirring device is provided with stirring shaft, a plurality of stirring vanes are connected on the stirring shaft, the upper part of stirring shaft is the spread cyclone type paddle, the bottom is the variable cross section type paddle, the cyclone type paddle and the variable cross section type paddle are coaxially arranged.

[0008] As preferred, the aluminium overhaul slag powder is added into the tank body through the feed metering screw conveyor, sulfuric acid and liquid alkali are sent into the tank body through the liquid inlet pipe.

[0009] As preferred, the stirring shaft drives the stirring vanes to rotate, and the aluminium overhaul slag powder, sulfuric acid, liquid alkali and other auxiliary materials are stirred and mixed.

[0010] As preferred, a plurality of flow resistance piers are built on the inner wall from the bottom of the tank body upwards, and the flow resistance piers are evenly arranged along the circumference.

[0011] As preferred, inert gas is injected into the nitrogen gas conveying pipeline to replace the residual air in the tank body.

[0012] As preferred, the positive pressure liquid seal tank discharges the excess gas in the tank body.

[0013] As preferred, acid-resistant support bricks are arranged between the bottom end of the flow resistance pier and the tank bottom of the tank body.

[0014] As preferred, the top of the tank body is communicated with the liquid inlet pipe and the feed metering screw conveyor.

[0015] As preferred, the tank body is in a cylindrical structure.

[0016] As preferred, one side of the tank body is made of cement and impregnated graphite bricks.

[0017] Compared with the prior art, the utility model has the beneficial effects that: the spread cyclone type paddle and the variable cross section type paddle are arranged, the mixing uniformity of the materials is effectively improved, and the problem of poor material mixing capacity of the existing leaching tank is solved.

[0018] The utility model has the characteristics of acid and alkali resistance, fluoride ion resistance, is suitable for complex chemical reaction environment, and prolongs the service life of equipment.

[0019] The utility model pays attention to airtightness and safety in design, reduces the risk of harmful substance leakage, and ensures the safety of the operating environment.

[0020] The utility model can efficiently decompose and dissolve materials, shorten the reaction time, and improve the production efficiency.

[0021] The utility model has the advantages of low energy consumption, high efficiency and zero pollution, and meets the requirements of modern industry for energy saving and environmental protection.

[0022] The utility model discloses adopt the spread cyclone paddle and variable cross -section paddle, can produce powerful axial flow and radial flow, shear stress is small, circulation rate is high, mixes more fully, and the material in the groove realizes uniform suspension, and the groove bottom will not produce the material. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is the structure schematic drawing of the utility model.

[0024] Fig. 2 It is the partial structure enlarged view C of the utility model.

[0025] Fig. 3 It is the partial structure enlarged view D of the utility model.

[0026] In the drawing: 1, groove body;2, cement;3, impregnated graphite brick;4, spread cyclone paddle;5, variable cross -section paddle;6, block flow pier;7, stirring device;8, nitrogen gas conveying pipeline;9, positive pressure liquid seal tank;10, feed metering screw conveyor. DETAILED DESCRIPTION

[0027] The utility model discloses below through specific embodiment, and combining the drawings, the technical scheme of the utility model is further specifically described, and the described embodiment is only a part of the embodiment of the utility model, but is not all the embodiment.

[0028] Example 1: refer to Figs. 1-3 A kind of aluminium overhaul residue leaching reaction tank, including groove body 1, the top of groove body 1 is fixed with stirring device 7, stirring shaft is arranged in stirring device 7, and a plurality of stirring blades are connected on stirring shaft, and spread cyclone paddle 4 is on the upper portion of stirring shaft, and variable cross-section paddle 5 is at the bottom, and the top of groove body 1 is connected with liquid inlet pipe and feed metering screw conveyor 10.Groove body 1 is fixed with stirring device 7, and stirring shaft is vertically arranged in groove body 1, and the output shaft of stirring device 7 is coaxially connected with the top end of stirring shaft, and stirring blade is fixed on stirring shaft, and stirring blade includes spread cyclone paddle 4 and variable cross-section paddle 5.The top of groove body 1 is connected with liquid inlet pipe and feed metering screw conveyor 10, and aluminium overhaul residue powder is added into groove body 1 by feed metering screw conveyor 10, and sulfuric acid and liquid alkali are sent into groove body 1 by liquid inlet pipe;Under the action of stirring device 7, aluminium overhaul residue powder, sulfuric acid, liquid alkali and other auxiliary materials are stirred and mixed by the rotation of stirring shaft and stirring blade, to facilitate reaction.Groove body 1 is built with four block flow piers 6 along the circumferential direction by pasting inner wall from groove bottom upwards, and the material is formed turbulence by block flow pier 6 in the process of stirring by stirring blade, which is conducive to making material mixing more uniform, and improving reaction efficiency;Block flow pier 6 is directly built by impregnated graphite brick 3, and a layer of 3mm vinyl resin is coated outside, which is conducive to improving corrosion resistance and prolonging the service life of block flow pier 6.

[0029] In actual operation, the aluminum overhaul slag powder is accurately added into the tank body 1 through the feeding metering screw conveyor 10, and the sulfuric acid and the liquid alkali are delivered into the tank body 1 through the liquid inlet pipe. After the stirring device 7 is started, the stirring shaft drives the stirring blades to rotate, and the cooperation of the spread cyclone type paddle 4 and the variable cross-section type paddle 5 enables the aluminum overhaul slag powder and the chemical reagents to be fully mixed, thereby promoting the efficient performance of the leaching reaction.

[0030] Considering that the aluminum overhaul slag can produce combustible gases such as CH4 and H2 during the reaction process, the utility model takes corresponding safety measures. In the production process, first, a certain proportion of clean water is injected into the tank, and then the inert gas nitrogen is injected into the tank through the nitrogen gas delivery pipeline 8 to replace the remaining air in the tank and ensure the constant pressure state of the positive pressure liquid seal tank 9. In this way, it can be ensured that the combustible gases produced during the stirring process are in an inert environment, avoiding the risk of combustion and explosion. At the same time, when the pressure in the tank increases, the positive pressure liquid seal tank 9 can timely discharge excess gas to prevent air from entering the leaching tank, further enhancing the safety of production.

[0031] The corrosion-resistant lining of the leaching tank is composed of polyester fiber glass steel, mastic 2 and impregnated graphite bricks 3. The wear-resistant layer and the material contact layer adopt impregnated graphite bricks 3, which have good wear resistance and corrosion resistance and can effectively resist the erosion of aluminum overhaul slag and chemical reagents. Four flow resistance piers 6 are evenly distributed around the circumference of the leaching tank, and the masonry material also adopts impregnated graphite bricks 3 to ensure the corrosion resistance of the entire tank body. The tank wall and the tank bottom are lined with polyester fiber glass steel and mastic 2, the tank cover is made of polyester fiber glass steel, and the shell, pipe opening and flange are lined with polytetrafluoroethylene. This multi-layer corrosion-resistant structure greatly prolongs the service life of the leaching tank.

[0032] The stirring device 7 adopts a new type of composite paddle, which has three layers of paddles. The bottom layer of paddle is a variable cross-section type paddle 5, and the upper two layers are spread cyclone type paddles 4. This design enables strong axial flow and radial flow to be generated during stirring, while the shear stress is small and the circulation rate is high, thereby realizing the full mixing of the materials. The design speed of the stirring device is 115 r / min, and the motor power is 37 Kw, which is suitable for the leaching tank with a size of The surface in contact with the material is lined with a steel-lined PO corrosion-resistant film layer, and the outer surface is treated with PPH, further improving the corrosion resistance and service life of the stirring device. Double-end mechanical seals are adopted to ensure the sealing performance during stirring and prevent material leakage.

[0033] Example 2: Refer to Figs. 1-3The aluminum overhaul slag leaching reaction tank provided by this utility model mainly consists of a tank body 1, which is a cylindrical structure with an open top. A stirring device 7 is securely installed on the top of the tank body using bolts and other fasteners. Inside the stirring device 7 is a stirring shaft, which is vertically arranged along the central axis of the tank body 1 and connected to several carefully designed stirring blades. The stirring blades at the top of the stirring shaft are swirling impellers 4, while those at the bottom are variable cross-section impellers 5. This arrangement aims to achieve efficient mixing of materials.

[0034] The top of the tank 1 is also connected to an inlet pipe and a feed metering screw conveyor 10. The inlet pipe is used to accurately deliver the liquid reagents required for the reaction, such as sulfuric acid and liquid alkali, into the tank 1, while the feed metering screw conveyor 10 is responsible for accurately adding the aluminum overhaul slag powder into the reaction system. After the stirring device 7 is started, the stirring shaft drives the stirring blades to rotate at high speed. The swirling impeller 4 and the variable cross-section impeller 5 work together to ensure that the aluminum overhaul slag powder and liquid reagents are fully contacted and mixed, creating favorable conditions for the subsequent chemical reaction.

[0035] The mixing device 7 adopts a novel composite blade design with three layers of blades. The bottom layer consists of variable cross-section blades 5, while the upper two layers are swirling flow blades 4. The design of the variable cross-section blades 5 ensures that each radial point maintains the same axial discharge rate during mixing, thus forming a more stable flow field and optimizing the hydraulic performance of the blades. Compared with other axial flow blades, it generates a larger discharge volume per unit power consumption, effectively achieving the mixing, suspension, and dispersion of materials.

[0036] The swirl-type impeller 4 relies on the strong axial convection generated by its large blades to ensure full reaction between materials. It combines the characteristics of both propeller and turbine types, with low power consumption, high circulation capacity, and low shear performance. Under the same effect, it can save about 30% of power consumption compared to traditional impellers, and is particularly suitable for operations such as reaction, solid-liquid suspension, dispersion, and slurrying.

[0037] The stirring device is designed to operate at a speed of 115 r / min and a motor power of 37 kW. These parameters are based on the actual dimensions of the leaching tank. The mixing system is precisely calculated and optimized based on material properties, ensuring thorough mixing while avoiding energy waste and equipment wear caused by over-mixing. All surfaces in contact with materials are lined with a steel-coated PO anti-corrosion film and then further treated with PPH, enhancing the corrosion resistance and service life of the mixing unit. A double-end mechanical seal ensures a tight seal during mixing, preventing material leakage and guaranteeing production safety and environmental cleanliness.

[0038] The inner structure of the tank 1 is unique, and the inner wall is fitted with four evenly distributed flow resistance piers 6 from the tank bottom upwards. These flow resistance piers 6 play an important role in the process of stirring the material by the stirring blades. When the stirring blades rotate, the material forms a complex flow pattern in the tank. The presence of the flow resistance piers 6 hinders the flow of the material, forming a turbulent flow. This turbulent flow state is conducive to the thorough mixing of the material, improving the reaction efficiency and ensuring that the various components in the aluminum overhaul slag can fully contact the chemical reagents and react.

[0039] The flow resistance piers 6 are directly built with impregnated graphite bricks 3, and the outside is coated with a 3mm thick layer of vinyl resin. The impregnated graphite bricks 3 have good corrosion resistance and wear resistance, which can effectively resist the erosion of aluminum overhaul slag and chemical reagents, prolonging the service life of the flow resistance piers 6. The vinyl resin coating further enhances its corrosion resistance, while filling the small gaps during the building process, making the surface of the flow resistance piers 6 smoother, reducing the adhesion and wall hanging phenomenon of the material.

[0040] Considering that the aluminum overhaul slag will produce a certain amount of flammable gas, such as CH4 and H2, during the reaction process, the utility model takes comprehensive safety measures to ensure the safety of the production process. Before the production starts, a certain proportion of clean water is first injected into the tank through the liquid inlet pipe, and then the inert gas nitrogen is injected into the tank through the nitrogen gas conveying pipeline 8, gradually replacing the remaining air in the tank 1, and ensuring that the constant pressure liquid seal tank 9 is in a constant pressure state.

[0041] This process ensures that the oxygen content in the tank 1 is reduced to a safe level through precise gas flow control and pressure monitoring, so that the flammable gas produced during the stirring process is in an inert environment, fundamentally eliminating the risk of combustion and explosion. At the same time, when the pressure in the tank 1 increases due to the reaction or other factors, the constant pressure liquid seal tank 9 can respond in time to automatically discharge excess gas to prevent the pressure in the tank 1 from being too high. The special design of the constant pressure liquid seal tank 9 can effectively prevent air from flowing into the tank 1, ensuring that the inert environment in the tank 1 is always maintained, further enhancing the safety of production.

[0042] The corrosion-resistant lining of the leaching tank is the key to ensuring the long-term stable operation of the equipment. The corrosion-resistant lining of the leaching tank of the utility model is composed of polyester fiber glass steel, cement 2 and impregnated graphite bricks 3, forming a multi-layer protective structure. Among them, the wear-resistant layer and the layer directly contacting the material use impregnated graphite bricks 3. The impregnated graphite bricks 3 not only have excellent wear resistance, which can resist the wear of the tank during the stirring process of the material, but also have excellent corrosion resistance, which can effectively resist the erosion of aluminum overhaul slag and various chemical reagents.

[0043] Four resistance piers 6 are evenly distributed around the circumference of the leaching tank, and the masonry material is also impregnated graphite brick 3, which ensures uniform corrosion resistance of the entire tank body. The tank wall and tank bottom are lined with polyester fiber glass steel and cement 2, which has good integrity and corrosion resistance, effectively preventing acidic substances from penetrating the tank shell. Cement 2 is filled between the glass steel and impregnated graphite brick 3, which plays a bonding and sealing role, further enhancing the corrosion resistance.

[0044] The tank cover is made of polyester fiber glass steel, which has good sealing and corrosion resistance, effectively preventing gas leakage and external substances from entering. The shell, pipe opening and flange are lined with polytetrafluoroethylene, which has excellent chemical corrosion resistance and temperature resistance, providing reliable protection for the connection parts of the leaching tank, ensuring long-term stable operation of the entire equipment in harsh chemical environments.

[0045] In actual operation, aluminum overhaul slag powder is accurately added to the tank body 1 through the feed metering screw conveyor 10, which can accurately control the amount of powder added according to the preset parameters, ensuring stable reaction. At the same time, liquid reagents such as sulfuric acid and liquid alkali are accurately delivered into the tank body 1 through the liquid inlet pipe and combined with the aluminum overhaul slag powder.

[0046] With the start of the stirring device 7, the stirring shaft drives the stirring blades to rotate at high speed. The combination of the spiral flow paddle 4 and the variable cross-section paddle 5 forms a complex flow and mixing pattern of aluminum overhaul slag powder and liquid reagents in the tank body. The axial flow generated by the spiral flow paddle 4 causes the material to form a circulating flow in the tank body, while the radial flow generated by the variable cross-section paddle 5 further disperses the material, allowing it to mix thoroughly. During stirring, the presence of resistance piers 6 hinders the flow of material, forming turbulence, further improving the mixing effect.

[0047] Through this series of carefully designed structures and operation processes, the aluminum overhaul slag leaching reaction tank of the present application can realize efficient leaching reaction of aluminum overhaul slag, while having good corrosion resistance and safety, providing reliable equipment support for harmless treatment and resource recovery of aluminum overhaul slag, and having broad application prospects and significant social benefits.

[0048] Safety is of paramount importance in the treatment of aluminum repair slag. The utility model discloses a nitrogen gas conveying pipeline 8 realizes the injection of inert gas to replace the residual air in the tank body 1. This process not only effectively reduces the concentration of combustible gas, but also prevents the mixing of oxygen in the air with the combustible gas, thereby avoiding the potential risk of explosion. The design of the nitrogen gas conveying pipeline 8 fully considers the flow rate and flow of the gas, ensuring that the replacement of air in the tank body 1 is completed in a short time, while being equipped with precise control valves to achieve precise control of the amount of nitrogen injection.

[0049] To ensure the safety of the production process, the utility model is equipped with a positive pressure liquid seal tank 9 for discharging excess gas in the tank body 1. When the pressure in the tank body 1 exceeds the set value, the excess gas will enter the positive pressure liquid seal tank 9 through the pipeline. The design of the positive pressure liquid seal tank 9 can effectively prevent air from flowing back into the tank body 1, ensuring that the inert environment in the tank body 1 is maintained. At the same time, the positive pressure liquid seal tank 9 can further process the discharged gas, such as removing harmful substances from the gas purification device, to reduce environmental pollution.

[0050] In the bottom structure of the leaching tank, acid-resistant support bricks are provided between the bottom end of the baffle 6 and the tank bottom of the tank body 1. This design not only provides stable support for the baffle 6, but also effectively prevents the baffle 6 from being corroded by acidic substances in the tank bottom. The acid-resistant support bricks are made of special acid-resistant materials, have good corrosion resistance and mechanical strength, and can work stably in harsh chemical environments for a long time.

[0051] The stirring system of the utility model adopts coaxial arrangement of cyclone type paddle 4 and variable cross-section type paddle 5. This design enables the two types of paddles to work together on the same stirring shaft, achieving efficient mixing of materials. The cyclone type paddle 4 can generate strong axial flow, causing the material to form a circulating flow in the tank body, while the variable cross-section type paddle 5 can generate radial flow, further enhancing the mixing effect of the material. The combination of the two not only improves the stirring efficiency, but also makes the material distribution in the tank body more uniform, improving the uniformity and completeness of the reaction.

[0052] The tank body 1 is designed in a cylindrical structure, which not only provides a large reaction volume, but also allows the material to form a good circulating flow during stirring. The cylindrical tank body 1 has uniform stress distribution, can withstand large internal pressure and stirring torque. In addition, the cylindrical structure is easy to install and maintain, which can effectively improve the production efficiency.

[0053] The combination structure of the cement 2 and the impregnated graphite brick 3 is adopted on one side of the tank body 1. The cement 2 has good adhesion and corrosion resistance, and can firmly bond the impregnated graphite brick 3 on the inner wall of the tank body 1. The impregnated graphite brick 3 has excellent high-temperature resistance, corrosion resistance and wear resistance, and can effectively resist the corrosion of the aluminum repair slag and chemical reagents. The combination structure not only improves the corrosion resistance of the tank body 1, but also prolongs the service life of the equipment and reduces the maintenance cost.

[0054] The utility model is not limited to the details of the above exemplary embodiments for those skilled in the art, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model.

Claims

1. A leaching reaction tank for aluminum overhaul slag, characterized in that, It includes a tank, with a stirring device fixed at the top of the tank. The stirring device has a stirring shaft inside, and several stirring blades are connected to the stirring shaft. The upper part of the stirring shaft has a swirling impeller, and the bottom part has a variable cross-section impeller. The swirling impeller and the variable cross-section impeller are coaxially arranged.

2. The aluminum overhaul slag leaching reaction tank according to claim 1, characterized in that, Aluminum overhaul slag powder is fed into the tank via a feed metering screw conveyor, while sulfuric acid and liquid alkali are fed into the tank through the inlet pipe.

3. The aluminum overhaul slag leaching reaction tank according to claim 2, characterized in that, The stirring shaft drives the stirring blades to rotate, mixing aluminum overhaul slag powder, sulfuric acid, liquid alkali, and other auxiliary materials.

4. The aluminum overhaul slag leaching reaction tank according to claim 1 or 3, characterized in that, Several flow-blocking piers are built into the inner wall of the tank from the bottom upwards, and the flow-blocking piers are evenly arranged along the circumference.

5. An aluminum overhaul slag leaching reaction tank according to claim 1 or 3, characterized in that, Inert gas is injected into the nitrogen delivery pipeline to replace the remaining air in the tank.

6. The aluminum overhaul slag leaching reaction tank according to claim 5, characterized in that, The positive pressure liquid seal tank discharges excess gas from the tank.

7. An aluminum overhaul slag leaching reaction tank according to claim 1 or 6, characterized in that, An acid-resistant support brick is provided between the bottom of the flow-blocking pier and the bottom of the trough.

8. The aluminum overhaul slag leaching reaction tank according to claim 1, characterized in that, The top of the tank is connected to an inlet pipe and a feed metering screw conveyor.

9. An aluminum overhaul slag leaching reaction tank according to claim 1 or 8, characterized in that, The tank is cylindrical in shape.

10. The aluminum overhaul slag leaching reaction tank according to claim 9, characterized in that, One side of the tank is made of mortar and impregnated graphite bricks.

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