Extraction tank for nickel sulfate purification

Abstract

The invention discloses an extraction tank for nickel sulfate purification. The extraction tank comprises a mixing tank, a clarifying tank, a driving assembly and a variable dip angle stirring assembly. A slope-shaped overflow weir and a plurality of flow separation grooves are arranged on one side of the mixing groove and are used for stably guiding the mixed liquid to the clarifying groove. The driving assembly comprises a shaft sealing box, a driving motor, a regulation and control steering engine and a rotatably mounted core rod, and the regulation and control steering engine drives the core rod to axially slide in the shaft sleeve rod and is used for regulating the working state of the stirring assembly. The stirring assembly comprises a rotating head seat, a paddle and a linkage frame, the linkage frame and the crank sleeve form a deflection mechanism through a connecting rod, so that the paddle realizes continuous dip angle change in the lifting process of the core rod, and a large dip angle strong mixing state at the initial stage of extraction and a small dip angle weak disturbance layering state at the later stage of extraction are formed. Through the synergistic effect of variable dip angle stirring and a multi-path flow guide structure, dynamic regulation and control of enhanced mixing and rapid layering are achieved, and the nickel sulfate extraction mass transfer efficiency and the phase separation efficiency are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of nickel sulfate purification technology, specifically to an extraction tank for nickel sulfate purification. Background Technology

[0002] The wet purification process for nickel sulfate typically employs a liquid-liquid extraction method. In a mixing tank, mechanical stirring ensures sufficient contact between the aqueous nickel sulfate solution and the organic extractant, facilitating the interphase migration of metal ions. Existing extraction tanks generally use fixed-angle impellers as a hybrid power source, with the stirring intensity primarily dependent on the stirring speed. However, the flow field characteristics of fixed-angle impellers are limited, making it difficult to accommodate the drastically different operating conditions in the initial and later stages of extraction. In the initial stage, strong shearing and fragmentation effects are required to increase the interphase contact area, while in the later stage, turbulence must be reduced to promote droplet coalescence and phase boundary stabilization. Traditional equipment often operates only under a single shear condition, resulting in both difficulties in stratification under high shear and insufficient extraction efficiency under low shear.

[0003] Existing technologies also employ mechanical stirring methods such as folded blades, adjustable pitch propellers, or frequency converters to change the stirring intensity. However, these structures mostly change the blade angle through mechanical rotation, resulting in complex structures. Furthermore, they are susceptible to angle drift due to centrifugal force during high-speed operation, making stable and reliable tilt angle control impossible. In addition, some extraction tanks attempt to improve two-phase stratification by increasing the area of ​​the clarification zone, adding baffles, or using a single-stage flow guiding structure. However, these methods still struggle to effectively suppress interfacial fluctuations transmitted from the mixing zone to the clarification zone. This makes it easy for emulsification or entrainment to occur between the aqueous and organic phases in the tank transition section, affecting phase separation efficiency and product purity.

[0004] Furthermore, in the design of traditional mixing tanks transitioning to clarification tanks, vertical overflow weirs or straight weir structures are often used. These structures exhibit large velocity gradients during the flow of the two-phase mixture, making the liquid prone to localized agitation or impact at the weir site. This destabilizes the phase interface and further exacerbates the risk of emulsification. For extraction processes requiring the handling of high-flow-rate or high-viscosity systems, existing weir structures offer limited contribution to interfacial stability.

[0005] In summary, existing extraction tanks generally suffer from the following shortcomings: (1) the stirring paddle cannot automatically match different shear requirements throughout the extraction process, making it difficult to balance mixing efficiency and stratification efficiency; (2) the paddle tilt angle adjustment structure is unstable and lacks reliability, and is prone to failure during high-speed operation; (3) the liquid transition structure between tanks is simple and cannot effectively suppress interface disturbances, resulting in a decrease in stratification efficiency. Therefore, there is an urgent need for a new extraction tank structure that can provide strong mixing in the early stage of extraction, form weak disturbance stratification in the later stage of extraction, and has both tilt angle stable control and interface smooth transition capabilities, in order to solve the above-mentioned problems of the existing technology. Summary of the Invention

[0006] This invention aims to solve the technical problems in existing nickel sulfate extraction equipment, such as "difficulty in simultaneously achieving mixing and stratification," "unadjustable impeller shearing," and "emulsification and entrainment caused by interface disturbances." It proposes an extraction tank for nickel sulfate purification that can form strong mixing in the early stages of extraction, weak disturbance stratification in the later stages, and achieve continuously adjustable impeller tilt angle. This invention achieves stable adjustment of the stirring tilt angle during high-speed operation by introducing a linkage mechanism, a first connecting rod pair, and a second connecting rod pair into the stirring assembly. Furthermore, the sloping overflow weir and flow-blocking trough structure enhance the smoothness of phase transition, thereby achieving a dual improvement in extraction efficiency and stratification efficiency.

[0007] The overall solution of this invention is as follows:

[0008] An extraction tank for nickel sulfate purification includes a mixing tank, a clarification tank, a drive assembly, and a stirring assembly. A drive motor provides rotational power to the bushing rod and the stirring assembly. A servo motor adjusts the axial sliding motion of the core rod, driving the blade tilt angle to achieve a two-stage power switching between mixing and stratification. An overflow weir and a flow-blocking trough structure ensure smooth flow from the mixing tank to the clarification tank.

[0009] For ease of understanding, the technical solution of the present invention is described below, line by line, according to the claims.

[0010] In a preferred embodiment, the extraction tank for nickel sulfate purification of the present invention includes a mixing tank, a clarification tank, a drive assembly, and a stirring assembly. An overflow weir communicating with the clarification tank is provided on one side of the mixing tank, and its surface is provided with several flow-blocking grooves to mitigate liquid flow disturbance and stabilize the interface state of the two phases entering the clarification tank. The drive assembly includes a shaft seal box, a drive motor, a control servo motor, and a core rod rotatably mounted inside the shaft seal box. The drive motor drives a shaft sleeve rod, which is rotatably fitted inside a fixed shaft sleeve, to rotate via a pulley. The top of the shaft sleeve rod is fixed to the stirring assembly. The control servo motor drives the core rod to slide axially inside the shaft sleeve rod to adjust the tilt angle of the stirring assembly. This technical solution can provide different flow field forms at different stages of the extraction process. Specifically, it enables dynamic switching between enhanced mixing and rapid stratification, avoiding poor emulsification and stratification caused by a single stirring method in traditional extraction tanks.

[0011] In a preferred embodiment, the stirring assembly includes a rotor seat, impellers, and a linkage frame fixed to the top of the core rod. Several crank sleeves are rotatably mounted on the surface of the rotor seat. The impellers are fixed to the surface of the fixed shaft sleeve. A connecting rod is movably connected to the surface of the linkage frame, and the bottom end of the connecting rod is movably connected to the crank sleeves. When the linkage frame rises or falls, it drives the crank sleeves to deflect, causing the impeller tilt angle to change continuously. This technical feature effectively achieves automatic adjustment of the impeller tilt angle as the core rod rises and falls. Specifically, it enables high shear and large circulation mixing capacity in the early stages of extraction, while achieving low disturbance and rapid coalescence stratification in the later stages of extraction.

[0012] In a preferred example, the number of blades is several and evenly distributed circumferentially on the rotor base, and they rotate synchronously with the rotor base under the drive of the drive motor, thereby forming a uniform mixing flow field. The specific technical effect is to improve mixing stability and mass transfer efficiency, and to avoid emulsification caused by excessive local shear.

[0013] In a preferred embodiment, the shaft seal box and the fixed shaft sleeve are fixed to the shaft center of the mixing tank. The shaft sleeve rod is rotatably sleeved inside the fixed shaft sleeve, and the core rod is movably sleeved inside the shaft sleeve rod and connected to the drive motor via a pulley. This structure ensures stable rotation of the stirring assembly and smooth lifting and lowering of the core rod, specifically improving the reliability and control accuracy of the equipment.

[0014] In a preferred example, the output end of the control servo is connected to a crank disc, and the bottom end of the core rod is sleeved onto a sleeve seat. A connecting rod is movably connected between the crank disc and the sleeve seat surface, enabling the control servo to drive the core rod to rise and fall via a crank mechanism. The specific technical effect is to provide reliable tilt adjustment power, resulting in stable tilt adjustment action and fast response speed.

[0015] In a preferred example, a first linkage is movably connected to the surface of the sleeve seat to suppress the sleeve seat from rotating along with the shaft rod; a second linkage is provided between the rotor seat and the linkage frame to achieve synchronous rotation of the rotor seat and the stirring assembly, so that the tilt angle adjustment is not disturbed by the drive rotation. The specific technical effect is to ensure the accuracy of the blade tilt angle adjustment and the stability of the linkage structure.

[0016] In a preferred example, the blades are provided with airfoil-shaped torsion sections along their length, and the tilt angle can be continuously changed during the lifting and lowering of the linkage. The specific technical effect is that the stirring assembly provides strong mixing in the early stages of extraction and weak disturbance stratification in the later stages, thereby improving the overall efficiency of the extraction process.

[0017] In a preferred example, the overflow weir has a sloping structure, and the flow dividers are arranged along the width of the sloping structure to form multiple flow paths. The specific technical effect is to reduce liquid flow impact and interface disturbance, making the transition between the mixing tank and the clarifying tank smoother and improving the stratification quality.

[0018] In a preferred example, the stirring assembly operates at a large angle at the lowest position of the linkage and at a small angle at the highest position. The angle can be dynamically adjusted to achieve a range from intensified mixing to rapid phase separation. The specific technical effect is to ensure thorough mixing in the initial stage of extraction and rapid phase separation in the later stage, thereby significantly improving the equipment's processing efficiency and extraction effect.

[0019] In summary, this invention achieves synergistic enhancement of both mixing and stratification stages by constructing an adjustable tilt-angle stirring assembly, a stable linkage mechanism, and a layered optimized structure, thus solving the problem that existing extraction tanks struggle to balance mass transfer efficiency and stratification efficiency. The device is reliable in structure and stable in operation, making it suitable for efficient separation processes in nickel sulfate and other metal extraction processes.

[0020] The beneficial effects achieved by this invention are as follows:

[0021] 1. In this invention, the stirring angle is continuously adjustable between large and small angles by the coordinated deflection of the blades and crank sleeve during the lifting and lowering process of the linkage frame. This enables the mixing tank to obtain a strong shear and high impact enhanced mixing effect in the early stage of extraction, and a weak disturbance and low shear stable stratification effect in the later stage of extraction, thereby significantly improving the extraction efficiency and phase separation efficiency.

[0022] 2. In this invention, by adjusting the tilt adjustment mechanism composed of the servo motor, crank disc, sleeve seat and the first connecting rod pair, the core rod is stably raised and lowered inside the bushing rod. The second connecting rod pair ensures that the linkage frame and the rotating head seat rotate synchronously, so that the stirring assembly can maintain the stability and accuracy of tilt adjustment during high-speed operation, and avoid structural vibration and adjustment error during the stirring process.

[0023] 3. In this invention, the overflow weir adopts a sloping structure and is combined with the flow divider to form a multi-path flow guide, which makes the liquid flow transition from the mixing tank to the clarification tank more stable, effectively reduces phase boundary disturbance, improves the stratification stability of the two-phase fluid, reduces emulsification and entrainment phenomena, and further improves the overall extraction process efficiency and product purity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the mixing tank and clarification tank structure according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the drive assembly and stirring assembly according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a stirring assembly structure according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the linkage structure between the control servo motor and the core rod according to an embodiment of the present invention;

[0029] Figure 6 This is one embodiment of the present invention. Figure 4 A schematic diagram of the structure at point A;

[0030] Figure 7 This is a schematic diagram of the core rod and linkage frame structure according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the surface structure of the rotating head seat according to an embodiment of the present invention.

[0032] Figure label:

[0033] 100. Mixing tank; 110. Clarifying tank; 120. Overflow weir; 121. Flow divider;

[0034] 200. Drive assembly; 210. Shaft seal box; 220. Drive motor; 230. Control servo motor; 240. Core rod; 211. Fixed shaft sleeve; 221. Pulley; 222. Shaft sleeve rod; 231. Crank disc; 241. Sleeve seat; 242. First connecting rod pair;

[0035] 300. Stirring assembly; 310. Rotor seat; 320. Blade; 330. Linkage frame; 311. Crank sleeve; 331. Connecting rod; 332. Second connecting rod pair. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0037] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0038] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, an extraction tank for nickel sulfate purification.

[0039] Combination Figures 1-8 As shown, the present invention provides an extraction tank for nickel sulfate purification, comprising a mixing tank 100, a clarification tank 110, a drive assembly 200, and a stirring assembly 300. The mixing tank 100 is mainly used for the initial mixing and enhanced mass transfer of the aqueous nickel sulfate solution and the organic extractant; the clarification tank 110 is used for the stratification and phase boundary stabilization control of the two-phase mixture; the drive assembly 200 provides stirring power and tilt angle adjustment power; and the stirring assembly 300 performs variable tilt angle stirring within the mixing tank 100.

[0040] like Figure 1 , Figures 3-7 As shown, an overflow weir 120 connected to a clarification tank 110 is provided on one side of the mixing tank 100. The surface of the overflow weir 120 is provided with several flow-blocking grooves 121, which are used to limit the disturbance intensity when the mixed liquid enters the clarification tank 110, so that the aqueous phase and the organic phase maintain a relatively stable interface morphology during the tank conversion stage.

[0041] The drive assembly 200 includes a shaft seal box 210, a drive motor 220, a control servo motor 230, and a core rod 240 rotatably mounted inside the shaft seal box 210. A fixed shaft sleeve 211 is provided inside the shaft seal box 210. The output end of the drive motor 220 is connected to the shaft sleeve rod 222 via a pulley 221. The shaft sleeve rod 222 is rotatably sleeved inside the fixed shaft sleeve 211, and its top end is used to install the stirring assembly 300.

[0042] The output end of the control servo motor 230 is connected to the bottom end of the core rod 240 to drive the core rod 240 to slide axially along the inner side of the bushing rod 222, thereby adjusting the tilt angle of the stirring assembly 300.

[0043] like Figures 3-8 As shown, the stirring assembly 300 includes a rotor seat 310, several blades 320, and a linkage frame 330 fixed to the top of the core rod 240. Several crank sleeves 311 are rotatably mounted on the surface of the rotor seat 310, and the blades 320 are fixedly mounted on the surface of the fixed shaft sleeves 211. A connecting rod 331 is movably connected to the surface of the linkage frame 330, and the bottom end of the connecting rod 331 is movably connected to the crank sleeves 311. When the core rod 240 is raised or lowered, it drives the crank sleeves 311 to deflect, thereby adjusting the tilt angle of the blades 320.

[0044] In this embodiment, as Figure 4 , Figure 8 As shown, the number of blades 320 is preferably 3 to 6, which are evenly arranged on the periphery of the rotor seat 310 in the circumferential direction and rotate synchronously with the rotation of the rotor seat 310, thereby forming a uniform radial flow field inside the mixing tank 100, which is beneficial for enhancing mixing and controlling shear distribution.

[0045] like Figure 3 As shown, the shaft seal box 210 and the fixed shaft sleeve 211 are fixedly installed at the axial center of the mixing tank 100 to ensure the stable operation of the stirring assembly 300. The shaft sleeve rod 222 is sleeved inside the fixed shaft sleeve 211 and is connected to the drive motor 220 through the pulley 221 to achieve stable rotation. The core rod 240 is movably sleeved inside the shaft sleeve rod 222 and can slide back and forth axially inside it to adapt to the functional requirements of variable tilt angle stirring.

[0046] like Figure 5 , Figure 6 As shown, the output end of the control servo 230 is fixedly connected to the crankshaft 231, and the bottom end of the core rod 240 is rotatably sleeved with a sleeve seat 241. Both the crankshaft 231 and the sleeve seat 241 have rotatable connecting parts on their surfaces, and are connected by a connecting rod, such as... Figure 5 The linkage structure in the middle is used for movable connection. When the servo motor 230 drives the crank disk 231 to deflect, the sleeve seat 241 is offset through the linkage mechanism, which ultimately realizes the lifting and lowering action of the core rod 240.

[0047] like Figures 5-7 As shown, a first connecting rod pair 242 is movably connected to the surface of the sleeve seat 241 to suppress the follow-up rotation of the sleeve seat 241 during the overall rotation of the drive assembly 200. Simultaneously, a second connecting rod pair 332 is provided between the rotor seat 310 and the linkage frame 330, so that when the bushing rod 222 rotates, the rotor seat 310 can drive the linkage frame 330 to rotate synchronously, thereby ensuring that the stirring assembly 300 maintains consistent linkage at high speeds.

[0048] The first connecting rod pair 242 remains stationary, preventing the headstock 241 from rotating with the rotating assembly; the second connecting rod pair 332 is responsible for making the linkage frame 330 and the headstock 310 rotate synchronously, ensuring that the tilt angle change of the blade 320 is only controlled by the lifting and lowering of the core rod 240 and is not affected by the overall rotation.

[0049] like Figure 8 As shown, the blade 320 has an airfoil-shaped twisted section along its length. This twisted section generates high axial thrust and shear force at large tilt angles, which is suitable for the need to enhance mixing in the early stage of extraction. When the linkage 330 is raised to the upper position, the connecting rod 331 drives the crank sleeve 311 to deflect, so that the tilt angle of the blade 320 gradually decreases, and the disturbance generated by the airfoil-shaped twisted section is significantly reduced, achieving the effect of weak disturbance stratification.

[0050] like Figure 1 , Figure 2 As shown, the overflow weir 120 adopts a sloping structure to mitigate changes in the flow velocity of the mixed liquid. Several flow dividers 121 are arranged parallel to each other along the width of the sloping structure, forming multiple flow paths, which makes the liquid velocity distribution entering the clarification tank 110 more uniform, avoids large-scale interface oscillations, and improves the phase separation effect.

[0051] like Figure 4 , Figure 5 As shown, when the linkage frame 330 is at its lowest point, the crank sleeve 311 and connecting rod 331 form the maximum deflection angle, placing the impeller 320 at a large tilt angle, suitable for enhanced shearing and high-energy mixing in the initial stage of extraction. When the linkage frame 330 is raised to its highest point, the connecting rod 331 places the impeller 320 at a small tilt angle, reducing the stirring area to a localized region, creating only weak disturbances, which is beneficial for rapid phase separation. This combined structure achieves controllable switching between the mixing and stratification stages.

[0052] Working principle and usage process of this invention:

[0053] During operation, the drive motor 220 drives the bushing rod 222 and its connected stirring assembly 300 to rotate synchronously. The overall rotation of the rotor seat 310 drives the uniformly distributed blades 320 to perform circumferential stirring, creating a circulating flow field between the nickel sulfate solution and the organic extractant in the mixing tank 100. In the initial stage of extraction, the linkage frame 330 is in a lower position, and the blades 320 are in a large tilt angle. The airfoil-shaped torsion section of the blades 320 generates strong axial impact force and radial shear force during rotation, which fully breaks down, disperses, and rapidly mixes the two phases, improving the mass transfer rate of metal ions between the aqueous and organic phases. As the extraction process progresses, the control servo motor 230 drives the core rod 240 to slide axially along the inner side of the bushing rod 222 via the crank disc 231 and the bushing seat 241. The raising and lowering of the core rod 240 synchronously drives the raising and lowering of the linkage frame 330. The movement of the linkage frame 330 causes the crank sleeve 311 to deflect via the connecting rod 331 connected to the crank sleeve 311, thereby continuously changing the tilt angle of the blade 320. This gradually switches the airfoil bending section of the blade 320 from a large tilt angle to a small tilt angle. During this process, the first connecting rod pair 242 inhibits the sleeve seat 241 from rotating with the overall rotation of the drive assembly 200, ensuring that the linkage frame 330 and the core rod 240 rotate synchronously with the stirring assembly 300. This ensures that the tilt angle adjustment of the blade 320 is controlled only by the control servo motor 230 and is not affected by the speed of the drive motor 220.

[0054] At a small tilt angle, the shear force generated by the rotation of the impeller 320 is significantly reduced, resulting in only weak disturbances in localized areas. This effectively prevents the mixture from being excessively broken down and difficult to separate in the later stages of extraction, allowing aqueous and organic droplets in the mixture to rapidly coalesce and migrate to their respective phase regions. Through the sloping overflow weir 120 and the flow dividers 121 arranged along its width, the aqueous and organic phases flow into the clarification tank 110 along a stable path, reducing interface disturbances and improving the stratification efficiency in the clarification zone. Ultimately, through the synergistic effect of power rotation, tilt angle adjustment, linkage transmission, and zoned flow guidance, the entire process of enhanced mixing in the initial stage of extraction and rapid stratification in the later stage is controlled, simultaneously improving both extraction and phase separation efficiency.

[0055] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An extraction tank for purifying nickel sulfate, characterized in that, It includes a mixing tank (100), a clarification tank (110), a drive assembly (200), and a stirring assembly (300). The mixing tank (100) has an overflow weir (120) on one side that communicates with the clarification tank (110), and the surface of the overflow weir (120) is provided with a plurality of flow-blocking grooves (121). The drive assembly (200) includes a shaft seal box (210), a drive motor (220), a control servo motor (230), and a core rod (240) rotatably mounted inside the shaft seal box (210). A fixed shaft sleeve (211) is provided inside the shaft seal box (210). The stirring assembly (300) includes a rotor seat (310), a blade (320), and a linkage frame (330) fixed to the top of the core rod (240). A plurality of crank sleeves (311) are rotatably mounted on the surface of the rotor seat (310). The blade (320) is fixed to the surface of the fixed shaft sleeve (211). A connecting rod (331) is movably connected to the surface of the linkage frame (330), and the bottom end of the connecting rod (331) is movably connected to the surface of the crank sleeve (311) so as to drive the blade (320) to deflect during the lifting and lowering motion of the linkage frame (330).

2. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The output end of the drive motor (220) is connected to a pulley (221) and a bushing rod (222) rotatably sleeved inside the fixed shaft sleeve (211). The stirring assembly (300) is fixed to the top of the bushing rod (222). The output end of the control servo motor (230) is connected to the bottom end of the core rod (240) by a linkage mechanism for driving the core rod (240) to slide axially inside the bushing rod (222).

3. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The number of blades (320) is several and they are evenly distributed in a circumferential direction on the surface of the rotating head seat (310), and they rotate synchronously with the rotating head seat (310).

4. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The shaft seal box (210) and the fixed shaft sleeve (211) are fixed to the shaft center of the mixing tank (100). The shaft sleeve rod (222) is rotatably sleeved on the inner side of the fixed shaft sleeve (211). The core rod (240) is movably sleeved on the inner side of the shaft sleeve rod (222). The bottom end of the shaft sleeve rod (222) is connected to the output end of the drive motor (220) through the pulley (221).

5. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The output end of the control servo (230) is connected to a crank disc (231), and the bottom end of the core rod (240) is rotatably sleeved with a sleeve seat (241). The sleeve seat (241) and the surface of the crank disc (231) are movably connected to a connecting rod.

6. The extraction tank for nickel sulfate purification according to claim 5, characterized in that, The surface of the headstock (241) is movably connected to a first link pair (242), and the surfaces of the rotating headstock (310) and the linkage frame (330) are movably connected to a second link pair (332).

7. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The blade (320) has an airfoil-shaped bending section along its length, and the blade (320) tilt angle can be continuously changed during the lifting and lowering of the linkage frame (330) to adapt to the strong mixing condition in the early stage of extraction and the weak disturbance stratification condition in the later stage of extraction.

8. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The overflow weir (120) has a sloping structure, and several of the flow-blocking channels (121) are arranged in parallel along the width direction of the sloping structure to form multiple flow paths between the mixing tank (100) and the clarification tank (110).

9. The extraction tank for nickel sulfate purification according to claim 1, characterized in that, The stirring assembly (300) forms a large-angle stirring state when the linkage frame (330) is at its lowest position, and a small-angle stirring state when the linkage frame (330) is at its highest position, so as to achieve dynamic control of liquid mixing intensity and stratification efficiency through tilt angle adjustment.

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