Cobalt-magnesium separation system and method for hydrometallurgy of cobalt and nickel

Abstract

The present invention discloses a cobalt-magnesium separation system and method for hydrometallurgy of cobalt and nickel. The system includes a wave-making mixing device, a depth-adjusting clarification device, a countercurrent extraction device, a first liquid collection tank, a washing device, a countercurrent stripping device, and a second liquid collection tank, which are connected in sequence. The countercurrent extraction device and the countercurrent stripping device have the same structure. The countercurrent extraction device is connected to a first collection kettle, and the countercurrent stripping device is connected to a second collection kettle. The method is to use the above system to carry out wet separation of cobalt and magnesium to obtain a high-purity cobalt solution. The present invention improves the extraction efficiency in the small-scale extraction operation of cobalt and magnesium, ensures that a high-purity cobalt solution can be obtained, reduces the space occupied by the equipment, reduces the input cost, and simplifies the operation process. The present invention is applicable to the technical field of cobalt-magnesium separation.

Description

Technical Field

[0001] The invention belongs to the technical field of cobalt-magnesium separation. Specifically, it relates to a cobalt-magnesium separation system and method for hydrometallurgical extraction of cobalt and nickel. Background Art

[0002] Existing cobalt-magnesium separation technologies often adopt solvent extraction, precipitation, ion exchange, or membrane separation methods. Among them, due to the relatively low investment cost of solvent extraction, and the organic phase used in extraction can be recycled, and the extraction effect and purity are relatively high, it is widely used. In the extraction process, mainly mixer-settlers, extraction towers, stripping equipment, etc. are used to extract Co 2+ and obtain a high-purity cobalt solution. However, when performing mixing and clarification operations in a mixer-settler, it is necessary to layer the mixture of the aqueous phase and the organic phase again. In this way, two steps are required in the mixer-settler, and it takes a long time to complete these two steps, resulting in low operation efficiency. Moreover, mixing is usually carried out by mechanical stirring. To ensure the adequacy of mixing, it is necessary to extend the stirring time. And because an extraction tower is used for extraction operations, its volume is large and the control is more complex, which is not conducive to small-scale continuous production operations; the stripping equipment also has the same structure as the extraction tower, and its disadvantages are the same as those of the extraction tower. Whether it is extraction or stripping, it is necessary to mix the aqueous phase and the organic phase. In small-scale continuous production operations, after two low-flow liquid phases enter the extraction tower, it is impossible to ensure the full mixing of the two liquid phases, resulting in a deterioration of the extraction effect. Summary of the Invention

[0003] The invention provides a cobalt-magnesium separation system and method for hydrometallurgical extraction of cobalt and nickel, which are used for small-scale extraction operations, improve extraction efficiency, ensure the obtainment of a high-purity cobalt solution, reduce the space occupied by equipment, reduce investment costs, and simplify the operation process.

[0004] To achieve the above object, the technical solutions adopted by the invention are as follows:

[0005] A cobalt-magnesium separation system for hydrometallurgical extraction of cobalt and nickel includes a wave-making mixing device, a depth-adjusting clarification device, a countercurrent extraction device, a first liquid collection tank, a washing device, a countercurrent stripping device, and a second liquid collection tank connected in sequence. The countercurrent extraction device and the countercurrent stripping device have the same structure. The countercurrent extraction device is connected to a first collection kettle, and the countercurrent stripping device is connected to a second collection kettle.

[0006] Furthermore, the wave-making mixing device includes a mixing tank and a plurality of wave-making mechanisms, wherein the plurality of wave-making mechanisms are installed side by side on the side wall of one side of the mixing tank, and these wave-making mechanisms are all connected to a transverse adapter seat, and a first driving mechanism for driving the wave-making mechanism to rotate is installed between the transverse adapter seat and these wave-making mechanisms, and an opening and closing liquid discharge mechanism is connected to the lower part of the other side wall of the mixing tank, and the opening and closing liquid discharge mechanism is respectively connected to the depth-adjustable clarification device and the circulating pump, and the circulating pump is connected to each wave-making mechanism through a distribution pipe system.

[0007] Furthermore, the wave-making mechanism includes a liquid inlet pipe rotatably mounted on the side wall of the mixing tank, and a wave-making head is constructed at one end of the liquid inlet pipe extending into the mixing tank, the wave-making head is connected to the liquid inlet pipe, and an end face of the wave-making head away from the liquid inlet pipe protrudes outward to form a liquid discharge end face, and a plurality of strip-shaped oblique flow ports are evenly opened on the liquid discharge end face along its circumference, the other end of the liquid inlet pipe is connected to the distribution pipe system, and the liquid inlet pipe is transmission-connected to the first driving mechanism.

[0008] Furthermore, a spherical joint is constructed between the liquid inlet pipe and the wave-making head, and a bowl-shaped joint is installed on the side wall of the mixing tank, and the spherical joint is movably installed in the bowl-shaped joint; the distribution pipe system includes a liquid inlet main pipe, and a plurality of liquid inlet branches are connected to the liquid inlet main pipe, each of the liquid inlet branches passes through a transverse adapter seat and is rotatably connected to the end of the corresponding liquid inlet pipe, and a rubber joint pipe connected to the outlet of the circulating pump is constructed on the liquid inlet main pipe; the two ends of the transverse adapter seat are respectively connected to the connecting frame through adapter components.

[0009] Furthermore, the depth-adjustable clarification device includes a clarification tank and a depth-adjustable liquid inlet mechanism, wherein the depth-adjustable liquid inlet mechanism is movably mounted in the clarification tank and is driven to move in a vertical direction, a liquid outlet pipe is connected to the lower part of the side wall on one side of the clarification tank, a transparent observation mirror is installed on the side wall on the other side of the clarification tank, and an optical interface detector is installed at the transparent observation mirror.

[0010] Furthermore, the depth-adjustable liquid inlet mechanism includes a depth-adjusting plate slidably mounted in the clarification tank, a plurality of pre-separation vertical pipes are installed side by side on the depth-adjusting plate, a liquid outlet is constructed at the connection between each of the pre-separation vertical pipes and the depth-adjusting plate, a swirl blade is constructed in the pre-separation vertical pipe, vertical suction pipes are respectively constructed at both ends of the depth-adjusting plate, the lower end of the vertical suction pipe passes through the depth-adjusting plate, the upper end of the vertical suction pipe is connected to a suction hose, two vertical hydraulic cylinders are symmetrically installed on both sides of the clarification tank, and the upper end of each of the vertical hydraulic cylinders is connected to the upper part of the corresponding vertical suction pipe.

[0011] Furthermore, the convection extraction device includes an upper movable frame, a lower fixed frame, two second vertical driving members and a plurality of convection regulating cylinders, the upper and lower ends of each of the convection regulating cylinders are respectively connected to the upper movable frame and the lower fixed frame, and the lower part of the convection regulating cylinder is transmission-connected to the second driving mechanism, the two second vertical driving members are symmetrically arranged on both sides of the lower fixed frame, and the two ends of each second vertical driving member are respectively connected to the upper movable frame and the lower fixed frame, the upper end of each convection regulating cylinder is connected to the first liquid pipe, and the lower end of the convection regulating cylinder is respectively connected to the second liquid pipe and the third liquid pipe which are independent of each other.

[0012] Furthermore, the convection regulating cylinder includes an upper disc seat and a lower adapter ring which are relatively arranged up and down, the upper disc seat is detachably connected to the upper movable frame, an outer sleeve is coaxially constructed at the lower end of the upper disc seat, the lower adapter ring is detachably connected to the lower fixed frame, the lower adapter ring is rotatably sleeved on the outside of the inner sleeve, the upper end of the inner sleeve is movably inserted into the outer sleeve by the lower end of the outer sleeve, a plurality of material disturbing blades are evenly constructed in the inner sleeve along its circumference, and the inner sleeve is transmission-connected to the second driving mechanism.

[0013] Furthermore, an upper liquid pipe extending upward is constructed at the center of the upper end of the outer sleeve, the upper liquid pipe is connected to the first liquid pipe, the upper end wall of the outer sleeve protrudes downward to form an upper jet portion, a first jet cavity connected to the upper liquid pipe is constructed in the upper jet portion, and a plurality of first jet holes connected to the first jet cavity are distributed at the lower end of the upper jet portion; a lower liquid pipe extending downward is constructed at the center of the inner sleeve, the lower liquid pipe is connected to the inner cavity of the inner sleeve through the lower end wall of the inner sleeve, an outer sleeve is mounted on the outer side of the lower liquid pipe, the lower end wall of the inner sleeve protrudes upward to form a lower jet portion, a second jet cavity connected to the outer sleeve is constructed in the lower jet portion, a plurality of second jet holes connected to the second jet cavity are distributed at the upper end of the lower jet portion, the lower liquid pipe is connected to the second liquid pipe, and the outer sleeve is connected to the third liquid pipe.

[0014] The present invention also discloses a method for separating cobalt and magnesium using the above-mentioned cobalt-nickel hydrometallurgical system, comprising the following steps:

[0015] Step 1. Add a predetermined amount of organic phase into a wave-making mixing device, and then add 2+ The water phase is gradually added into the wave-making mixing device according to a predetermined amount, so that surging waves are formed in the wave-making mixing device;

[0016] Step 2. Wait until the Co 2+ After the water phase is completely added into the wave-making mixing device, the mixed liquid in the wave-making mixing device is circulated, so that the mixed liquid in the wave-making mixing device is always in a surging state;

[0017] Step 3. After mixing, supply the mixed liquid into the depth-adjustable clarifying device, so that the mixed liquid undergoes gravity stratification in the depth-adjustable clarifying device, and separate the organic phase containing Co 2+ from the aqueous phase;

[0018] Step 4. Withdraw the organic phase containing Co 2+ from the depth-adjustable clarifying device and supply it into the countercurrent extraction device, and at the same time supply the aqueous phase into the countercurrent extraction device for countercurrent mixing;

[0019] Step 5. After mixing, drain it into the first liquid collection tank for stratification, and drain the raffinate into the first collection kettle;

[0020] Step 6. Supply the extracted organic phase into the washing device, and use dilute acid to wash the organic phase to remove the entrained Mg 2+ impurities;

[0021] Step 7. Feed the washed product into the countercurrent stripping device, and at the same time supply strong acid into the countercurrent stripping device. After sufficient mixing, transfer it into the second liquid collection tank, and perform gravity stratification in the second liquid collection tank to strip Co 2+ from the organic phase into the aqueous phase, and then drain the raffinate into the second collection kettle to obtain a high-purity cobalt solution.

[0022] Due to the adoption of the above structure, compared with the prior art, the technical progress achieved by the present invention is that the present invention injects the aqueous phase containing Co 2+ into the wave-making mixing device in a wave-making manner, so that the aqueous phase is mixed with the organic phase in the wave-making mixing device. Since the aqueous phase moves in the organic phase in a surging wave, it promotes the full mixing of the two liquid phases. According to the mixing situation, the mixed liquid in the wave-making mixing device can be forced to circulate, so that after the mixed liquid leaves the wave-making mixing device, it is injected into the wave-making mixing device again in a wave-making manner to ensure Co 2+Quickly and fully exchange values within the organic phase. The present invention uses a depth-adjustable clarification device to perform layering of the mixed solution. The mixed solution is divided into multiple branches and synchronously enters the depth-adjustable clarification device, and pre-layering occurs during the entry process. Then, it converges at the boundary of the two liquid phases in the depth-adjustable clarification device for secondary layering. Moreover, as the liquid level rises, the interface between the two liquid phases gradually rises (as the total amount of liquid in the depth-adjustable clarification device increases, the interface will naturally rise). Control the depth-adjustable part in the depth-adjustable clarification device to move gradually upward. The lower part of this depth-adjustable part is always close to the interface between the two liquid phases. The pre-separated mixed solution is always transported near the interface, and the lower part of the depth-adjustable part slows down the pre-separated mixed solution flowing towards the interface, avoiding disturbing the two liquid phases at the interface and making the layering effect and efficiency of the pre-separated mixed solution at the interface better. The convective extraction device and the convective stripping device of the present invention have the same structure. Through convection, the two liquid phases are fully mixed, and the extraction and stripping of Co 2+ are achieved, ensuring that Mg 2+ impurities are fully removed, and the purity of the cobalt solution is improved. Moreover, the wave-making mixing device, depth-adjustable clarification device, convective extraction device, and convective stripping device of the present invention are all small-scale devices, which are suitable for small-scale cobalt-magnesium separation operations. In summary, in the small-scale extraction operation of cobalt and magnesium, the present invention improves the extraction efficiency, ensures that a high-purity cobalt solution can be obtained, reduces the space occupied by the equipment, lowers the input cost, and simplifies the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0024] In the drawings:

[0025] Figure 1 is a flowchart of an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of the connection between the wave-making mixing device and the depth-adjustable clarification device of an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of the wave-making mixing device of an embodiment of the present invention;

[0028] Figure 4 is a schematic structural diagram of the wave-making mixing device of an embodiment of the present invention from another angle;

[0029] Figure 5 is a partial structural diagram of the first driving mechanism in the wave-making mixing device of an embodiment of the present invention;

[0030] Figure 6 It is a schematic structural diagram after the separation of the opening and closing liquid discharge mechanism in the wave-making mixing device of the embodiment of the present invention;

[0031] Figure 7 It is a schematic structural diagram of the connection between the wave-making mechanism and the mixing tank in the wave-making mixing device of the embodiment of the present invention;

[0032] Figure 8 It is a schematic structural diagram after the separation of the wave-making mechanism and the mixing tank in the wave-making mixing device of the embodiment of the present invention;

[0033] Figure 9 It is a schematic structural diagram of the wave-making mechanism in the wave-making mixing device of the embodiment of the present invention;

[0034] Figure 10 It is a schematic structural diagram of the depth-adjustable clarification device of the embodiment of the present invention;

[0035] Figure 11 It is a partial structural sectional view of the depth-adjustable clarification device of the embodiment of the present invention;

[0036] Figure 12 It is a schematic structural diagram of the depth-adjustable liquid inlet mechanism in the depth-adjustable clarification device of the embodiment of the present invention;

[0037] Figure 13 It is a schematic structural diagram of the countercurrent extraction device of the embodiment of the present invention;

[0038] Figure 14 It is a schematic structural diagram of another angle of the countercurrent extraction device of the embodiment of the present invention;

[0039] Figure 15 It is a partial structural schematic diagram of the second driving mechanism in the countercurrent extraction device of the embodiment of the present invention;

[0040] Figure 16 It is a schematic structural diagram of the countercurrent adjustment cylinder in the countercurrent extraction device of the embodiment of the present invention;

[0041] Figure 17 It is an axial structural sectional view of the countercurrent adjustment cylinder in the countercurrent extraction device of the embodiment of the present invention;

[0042] Figure 18 It is Figure 17 an enlarged structural view of part A in

[0043] Figure 19 It is an exploded structural view of the countercurrent adjustment cylinder after removing the upper disc seat and the outer sleeve in the embodiment of the present invention;

[0044] Figure 20 It is a partial structural schematic diagram of the connection between the lower adapter ring and the inner sleeve in the countercurrent adjustment cylinder of the embodiment of the present invention;

[0045] Figure 21 This is a partial structural schematic diagram of the connection between the upper disc seat and the outer sleeve in the flow regulating cylinder according to an embodiment of the present invention.

[0046] Labeled components: 100 - Wave-making mixing device, 101 - Mixing tank, 102 - First driving mechanism, 1021 - First driving motor, 1022 - First driving sprocket, 1023 - First transfer sprocket, 1024 - First chain, 103 - Wave-making mechanism, 1031 - Connecting flange, 1032 - Bowl-shaped joint, 1033 - Liquid inlet pipe, 1034 - Spherical joint, 1035 - Wave-making head, 1036 - Strip-shaped inclined flow port, 104 - Distribution pipe system, 1041 - Liquid inlet main pipe, 1042 - Rubber joint pipe, 1043 - Liquid inlet branch pipe, 1044 - First control valve, 105 - Open-close type liquid discharge mechanism, 1051 - Liquid discharge elbow, 1052 - Fitting set, 1053 - Horizontal conduit, 1054 - First guide through hole, 1055 - Second guide through hole, 1056 - Operating handwheel, 106 - Return liquid pipe, 107 - Second control valve, 108 - Liquid inlet joint, 109 - Third control valve, 110 - Circulation pump, 111 - Liquid outlet joint, 112 - Horizontal adapter seat, 113 - Horizontal rod, 114 - First rigid spring, 115 - First vertical driving member, 116 - Second rigid spring, 117 - Assembly port, 118 - Fixed edge, 200 - Depth-adjustable clarification device, 201 - Clarification tank, 202 - Liquid outlet pipe, 203 - Fourth control valve, 204 - Transparent observation mirror, 205 - Adapter plate, 206 - Vertical strip-shaped hole, 207 - Optical interface detector, 208 - Pre-separation vertical pipe, 209 - Liquid inlet hopper, 210 - Swirl vane, 211 - Depth-adjusting plate, 212 - Liquid outlet, 213 - Vertical suction pipe, 214 - Suction hose, 215 - Vertical hydraulic cylinder, 300 - First liquid collection tank, 400 - Convective extraction device, 401 - Convective adjustment cylinder, 40101 - Upper disc seat, 40102 - First fixed ear, 40103 - Upper jet part, 40104 - First jet cavity, 40105 - First jet hole, 40106 - Upper liquid pipe, 40107 - Fifth control valve, 40108 - Outer sleeve, 40109 - Lower transfer ring, 40110 - Second fixed ear, 40111 - Lower jet part, 40112 - Second jet cavity, 40113 - Second jet hole, 40114 - Lower liquid pipe, 40115 - Outer sleeve pipe, 40116 - First channel, 40117 - Second channel, 40118 - Communication hole, 40119 - Transfer sleeve, 40120 - Conducting cavity, 40121 - Adapter pipe, 40122 - Sixth control valve, 40123 - Connecting cover, 40124 - Fixed sleeve, 40125 - Vertical pipe, 40126 - Seventh control valve, 40127 - Inner sleeve, 40128 - Stirring blade, 402 - Lower fixing frame, 403 - Fixed wing, 404 - Lower connecting ear, 405 - Upper movable frame, 406 - Upper connecting ear, 407 - Second vertical driving member, 408 - First liquid pipe, 409 - Second liquid pipe, 410 - Third liquid pipe, 411 - Mounting plate, 412 - Second driving motor, 413 - Second driving sprocket414 - Second transfer sprocket, 415 - Second chain, 500 - Washing device, 600 - Convective counter - extraction device, 700 - Second liquid collection tank., Detailed implementation manners

[0047] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0048] The present invention discloses a cobalt - magnesium separation system for hydrometallurgy of cobalt and nickel. As Figure 1-21 shown, it includes a wave - making mixing device 100, a depth - adjusting clarification device 200, a convective extraction device 400, a first liquid collection tank 300, a washing device 500, a convective counter - extraction device 600, and a second liquid collection tank 700, which are connected in sequence. The structures of the convective extraction device 400 and the convective counter - extraction device 600 are the same. The convective extraction device 400 is connected to a first collection kettle, and the convective counter - extraction device 600 is connected to a second collection kettle. The washing device 500 is generally a small - scale mixer - settler 201, or another set of wave - making mixing device 100 and depth - adjusting clarification device 200 is selected. The working principle and advantages of the present invention are as follows: The present invention injects the aqueous phase containing Co 2+ into the wave - making mixing device 100 in a wave - making manner, so that the aqueous phase is mixed with the organic phase in the wave - making mixing device 100. Since the aqueous phase moves in the form of surging waves in the organic phase, it promotes the full mixing of the two liquid phases. According to the mixing situation, the mixed liquid in the wave - making mixing device 100 can be forced to circulate, so that after the mixed liquid leaves the wave - making mixing device 100, it is injected into the wave - making mixing device 100 again in a wave - making manner, ensuring that Co 2+ is quickly and fully exchanged into the organic phase. The present invention uses the depth - adjusting clarification device 200 to stratify the mixed liquid. The mixed liquid is divided into multiple branches and synchronously enters the depth - adjusting clarification device 200, and pre - stratification occurs during the entry process. Then, the two liquid phases converge at the interface of the depth - adjusting clarification device 200 for secondary stratification. Moreover, as the liquid level rises, the interface between the two liquid phases gradually rises (when the total amount of liquid in the depth - adjusting clarification device 200 increases, the interface will naturally rise). By controlling the depth - adjusting part in the depth - adjusting clarification device 200 to move gradually upward, the depth - adjusting part is always close to the interface between the two liquid phases. The pre - separated mixed liquid is always transported to the vicinity of the interface, and the lower part of the depth - adjusting part slows down the flow of the pre - separated mixed liquid flowing towards the interface, avoiding disturbing the two liquid phases at the interface, and making the stratification effect and efficiency of the pre - separated mixed liquid at the interface better. The convective extraction device 400 and the convective counter - extraction device 600 of the present invention have the same structure, and the two liquid phases are fully mixed by convection, and the extraction and counter - extraction of Co 2+extraction and stripping to ensure Mg 2+ impurities are fully removed, improving the purity of the cobalt solution. Moreover, the wave-making mixing device 100, depth-adjusting clarification device 200, countercurrent extraction device 400 and countercurrent stripping device 600 of the present invention are all small-scale devices, which are suitable for small-scale cobalt-magnesium separation operations. In summary, in the small-scale extraction operation of cobalt and magnesium of the present invention, the extraction efficiency is improved, it is ensured that a high-purity cobalt solution can be obtained, the space occupied by the equipment is reduced, the input cost is lowered, and the operation process is simplified.

[0049] As a preferred embodiment of the present invention, such as Figure 3 , 4As shown in the figure, the wave-making type mixing device 100 includes a mixing tank 101, a lateral adapter 112, a first driving mechanism 102, a distribution piping system 104, an opening and closing type liquid discharging mechanism 105, and a plurality of wave-making mechanisms 103. Among them, the plurality of wave-making mechanisms 103 are arranged side by side on the side wall of one side of the mixing tank 101, and these wave-making mechanisms 103 are all connected to the lateral adapter 112. The first driving mechanism 102 is assembled between the lateral adapter 112 and these wave-making mechanisms 103, and the first driving mechanism 102 is used to drive each wave-making mechanism 103 to rotate. The opening and closing type liquid discharging mechanism 105 is communicated at the lower position of the other side wall of the mixing tank 101. The opening and closing type liquid discharging mechanism 105 is respectively communicated with the depth-adjustable clarification device 200 and the circulation pump 110, and the circulation pump 110 is communicated with each wave-making mechanism 103 through the distribution piping system 104. The working principle and advantages of this embodiment are as follows: In this embodiment, the first driving mechanism 102 can be controlled according to requirements to drive each wave-making mechanism 103 to rotate for large-amplitude swirling wave-making operations. It is also possible not to control the operation of the first driving mechanism 102, so that each wave-making mechanism 103 is in a non-rotating state. The aqueous phase is evenly distributed to each wave-making mechanism 103 through the distribution piping system 104, and then is injected into the mixing tank 101 by the wave-making mechanism 103, so that multiple continuous high-pressure water flows are formed in the mixing tank 101. These water flows cause multiple waves to be formed in the liquid in the mixing tank 101, and the boundaries of the high-pressure water flows jet out from two adjacent wave-making mechanisms 103 blend with each other, thereby avoiding the situation of water flow surging dead corners and ensuring that the two liquid phases in the mixing tank 101 are fully and quickly mixed. After the aqueous phase is completely injected into the mixing tank 101, the circulation pump 110 is turned on to pump the mixed liquid in the mixing tank 101 into the distribution piping system 104 through the opening and closing type liquid discharging mechanism 105. Then, it is supplied to each wave-making mechanism 103 by the distribution piping system 104, and then jets into the mixing tank 101, so that the mixed liquid is discharged from the mixing tank 101 and then enters the mixing tank 101 in a circulating state, and it is ensured that the mixed liquid in the mixing tank 101 is always in a surging state, so that the organic phase and the liquid phase are fully mixed. After the cobalt ions in the aqueous phase are completely exchanged into the organic phase, the opening and closing type liquid discharging mechanism 105 is adjusted to communicate the mixing tank 101 with the depth-adjustable clarification device 200. In this way, the mixed liquid is continuously supplied from the mixing tank 101 into the depth-adjustable clarification device 200.

[0050] As a preferred embodiment of the present invention, as Figures 7-9As shown, the wave-making mechanism 103 includes a liquid inlet pipe 1033 and a wave-making head 1035. The liquid inlet pipe 1033 is rotatably installed on the side wall of the mixing tank 101. The wave-making head 1035 is formed at one end of the liquid inlet pipe 1033 extending into the mixing tank 101. The wave-making head 1035 is communicated with the liquid inlet pipe 1033. One end face of the wave-making head 1035 away from the liquid inlet pipe 1033 protrudes outward to form a liquid discharge end face. A plurality of strip-shaped oblique flow ports 1036 are evenly arranged along the circumferential direction of the liquid discharge end face. The other end of the liquid inlet pipe 1033 is communicated with the distribution pipe system 104, and the liquid inlet pipe 1033 is in transmission connection with the first driving mechanism 102. The aqueous phase or the mixed liquid enters the liquid inlet pipe 1033 through the distribution pipe system 104, and then jets out through the respective strip-shaped oblique flow ports 1036 on the wave-making head 1035, thereby forming a certain degree of swirl. When it is necessary to enhance the intensity of the swirl, the first driving mechanism 102 can be controlled to act, so that it drives the liquid inlet pipe 1033 to drive the wave-making head 1035 to rotate. In this way, the swirling degree of the liquid flowing out of the wave-making head 1035 increases, promoting the full blending and mixing of the aqueous phase and the organic phase. In this embodiment, the connection angle between the wave-making mechanism 103 and the mixing tank 101 can be adjusted. Specifically, a plurality of assembly ports 117 are formed on the side wall of the mixing tank 101. These assembly ports 117 are arranged in one-to-one correspondence with a plurality of wave-making mechanisms 103. A fixing edge 118 is formed at the outer edge of each assembly port 117. A bowl-shaped joint 1032 is provided at the assembly port 117. A connecting flange 1031 is formed at the outer edge of the bowl-shaped joint 1032. Moreover, the bowl-shaped joint 1032 is divided into two halves, and the connecting flange 1031 is also divided into two halves accordingly. The connecting flange 1031 is detachably connected to the fixing edge 118, and the bowl-shaped joint 1032 is communicated with the mixing tank 101 through the assembly port 117. A spherical joint 1034 is formed between the liquid inlet pipe 1033 and the wave-making head 1035. The spherical joint 1034 is movably assembled in the bowl-shaped joint 1032. As Figure 3 , 5As shown in the figure, the first driving motor 1021 of this embodiment includes a first driving motor 1021, a first chain 1024, a plurality of first transmission sprockets 1022 and a plurality of first transfer sprockets 1023. The first transmission sprockets 1022 are coaxially installed on the corresponding liquid inlet pipes 1033 one by one. The first transfer sprockets 1023 are rotatably installed side by side on the horizontal transfer seat 112, and on both sides of each first transfer sprocket 1023 are the first transmission sprockets 1022 respectively, that is, one first transfer sprocket 1023 is arranged between every two adjacent first transmission sprockets 1022. Moreover, the first chain 1024 drives and connects all the first transmission sprockets 1022 and all the first transfer sprockets 1023. The function of the first transfer sprocket 1023 is to enable the effective driving connection between the first transmission sprocket 1022 and the first chain 1024. The number of the first driving motors 1021 in this embodiment is two, and these two first driving motors 1021 are both installed on the horizontal transfer seat 112, and the output shaft of the first driving motor 1021 is coaxially connected to the corresponding first transfer sprocket 1023. When controlling the operation of the first driving motor 1021, it drives each wave-making mechanism 103 to rotate through the transmission mode of the sprockets.

[0051] As a preferred embodiment of the present invention, as Figure 3 , 4As shown in FIGS. 6, the distribution pipe system 104 includes a main liquid inlet pipe 1041, and a plurality of liquid inlet branch pipes 1043 are communicated with the main liquid inlet pipe 1041. Each liquid inlet branch pipe 1043 passes through the horizontal adapter 112, and the end of the liquid inlet pipe 1033 corresponding to the liquid inlet branch pipe 1043 is rotatably connected. A first control valve 1044 is installed on the liquid inlet branch pipe 1043. A rubber joint pipe 1042 is constructed on the main liquid inlet pipe 1041, and the rubber joint pipe 1042 is communicated with the outlet of the circulation pump 110. The two ends of the horizontal adapter 112 in this embodiment are respectively connected to the connecting frame through the adapter assembly. The specific structure of the adapter assembly is that the adapter assembly includes a horizontal rod 113 and a first vertical driving member 115. One end of the horizontal rod 113 is fixedly connected to one end of the horizontal adapter 112 through a first rigid spring 114. The lower end of the first vertical driving member 115 is hinged to the horizontal rod 113, and the upper end of the first vertical driving member 115 is hinged to the connecting frame. The first vertical driving member 115 is preferably a vertical cylinder. In this way, during the process of controlling the action of the first vertical driving member 115, the horizontal adapter 112 drives each wave-making mechanism 103 to adjust a certain angle upward or downward with the bowl-shaped joint 1032 as the point through the distribution pipe system 104, so that the wave-making head 1035 jets obliquely upward or obliquely downward, realizing the all-round and dead-angle-free disturbance of the liquid in the mixing tank 101. In this embodiment, a second rigid spring 116 is installed at the output end of the first vertical driving member 115. The second rigid spring 116 and the above-mentioned first rigid spring 114 both play a role in buffering and energy absorption, and compensate for the relative positions of the horizontal adapter 112, the horizontal rod 113 and the first vertical driving member 115. The specific structure of the opening and closing liquid discharge mechanism 105 in this embodiment is that the opening and closing liquid discharge mechanism 105 includes a horizontal conduit 1053 and a plurality of liquid discharge elbow pipes 1051. These liquid discharge elbow pipes 1051 are arranged side by side. One end of each liquid discharge elbow pipe 1051 extends horizontally and is communicated with the lower part on one side of the mixing tank 101, and the other end of the liquid discharge elbow pipe 1051 bends and extends vertically downward; a fitting sleeve 1052 is constructed on each liquid discharge elbow pipe 1051. The axis of the fitting sleeve 1052 is perpendicular to the axis of the horizontal part of the liquid discharge elbow pipe 1051, and the fitting sleeve 1052 is communicated with the liquid discharge elbow pipe 1051. One end of the horizontal conduit 1053 in this embodiment passes through each fitting sleeve 1052 in sequence. Two first guide holes 1054 and one second guide hole 1055 are opened on the horizontal conduit 1053 and in the part located in the liquid discharge elbow pipe 1051. The two first guide holes 1054 are symmetrically arranged, and the second guide hole 1055 is located between the two first guide holes 1054.An operating handwheel 1056 is installed at one end of the horizontal conduit 1053. The other end of the horizontal conduit 1053 is rotatably connected to one end of the liquid return pipe 106. The other end of the liquid return pipe 106 and the liquid inlet joint 108 are both communicated with the inlet end of the circulation pump 110. The outlet end of the circulation pump 110 is communicated with a liquid outlet joint 111, and the liquid outlet joint 111 is communicated with the rubber joint pipe 1042. In this embodiment, a second control valve 107 is installed on the liquid return pipe 106, and a third control valve 109 is installed on the liquid inlet joint 108. In this embodiment, by rotating the operating handwheel 1056, the horizontal conduit 1053 rotates a certain angle. When the second conduction pipe communicates with the horizontal part of the liquid discharge elbow 1051 and the horizontal conduit 1053 closes the vertical part of the liquid discharge elbow 1051, at this time, the mixing tank 101 is communicated with the liquid return pipe 106 through the horizontal conduit 1053, and then the circulation pump 110 can be controlled to circulate the mixed liquid. When the operating handwheel 1056 is rotated so that the two first through holes 1054 communicate the horizontal part and the vertical part of the liquid discharge elbow 1051, the second control valve 107 is closed. At this time, the mixed liquid in the mixing tank 101 can be shunted and synchronously supplied to the depth-adjustable clarification device 200.

[0052] As a preferred embodiment of the present invention, as Figures 10-12As shown, the depth-adjustable clarification device 200 includes a clarification tank 201 and a depth-adjustable liquid inlet mechanism (the above-mentioned depth-adjustable part). Among them, the depth-adjustable liquid inlet mechanism is movably assembled in the clarification tank 201, and the depth-adjustable liquid inlet mechanism can be driven to move in the vertical direction, so that the lower part of the depth-adjustable liquid inlet mechanism is always near the interface. A liquid outlet pipe 202 is connected to the lower part of one side wall of the clarification tank 201, and a fourth control valve 203 is installed on the liquid outlet pipe 202. In this embodiment, a transparent observation mirror 204 is installed on the other side wall of the clarification tank 201. A transfer plate 205 is installed at the transparent observation mirror 204. A vertical strip-shaped hole 206 is opened on the transfer plate 205. The optical interface detector 207 is detachably connected to the vertical strip-shaped hole 206 and is used to monitor the position of the interface in the clarification tank 201. In this embodiment, the position of the interface is monitored in real time by the optical interface detector 207. At the same time, the depth-adjustable liquid inlet mechanism is controlled to move in the vertical direction in real time, so that the lower part of the depth-adjustable liquid inlet mechanism is always close to the position of the interface. The depth-adjustable liquid inlet mechanism of this embodiment includes a depth-adjustable plate 211 and a plurality of pre-separation vertical pipes 208. These pre-separation vertical pipes 208 are arranged side by side on the depth-adjustable plate 211. A liquid inlet hopper 209 is constructed at the upper end of each pre-separation vertical pipe 208. A plurality of swirl vanes 210 are constructed in the pre-separation vertical pipe 208. These swirl vanes 210 are uniformly arranged along the circumferential direction of the pre-separation vertical pipe 208. A liquid outlet 212 is constructed at the connection between each pre-separation vertical pipe 208 and the depth-adjustable plate 211, and a plurality of holes are opened on the depth-adjustable plate 211 to facilitate the pre-separated liquid flowing out from the liquid outlet 212 to smoothly and gently pass through the depth-adjustable plate 211 and enter the clarification tank 201. In this embodiment, vertical suction pipes 213 are respectively constructed at both ends of the depth-adjustable plate 211. The lower end of each vertical suction pipe 213 penetrates the depth-adjustable plate 211, and the vertical suction pipe 213 is communicated with the area of the clarification tank 201 below the depth-adjustable plate 211. Vertical hydraulic cylinders are respectively installed on both sides of the clarification tank 201. The upper ends of the two vertical suction pipes 213 are respectively fixedly connected to the upper ends of the two vertical hydraulic cylinders one by one. In this way, when the vertical position of the interface changes, the two vertical hydraulic cylinders are controlled to act synchronously, so that the two vertical hydraulic cylinders drive the depth-adjustable plate 211 to move vertically by driving the two vertical suction pipes 213, so that the depth-adjustable plate 211 approaches the interface. In this embodiment, a suction hose 214 is connected to the upper end of at least one vertical suction pipe 213. By sucking the suction hose 214, one of the two stratified liquid phases is gradually sucked out. The height of the lower end face of the mixing tank 101 in this embodiment is higher than the height of the upper end face of the clarification tank 201, so that a liquid level difference is formed between the mixing tank 101 and the clarification tank 201, so that the mixed liquid can smoothly enter the area of the interface in the clarification tank 201 from the mixing tank 101.In this embodiment, the mixed liquid in the mixing tank 101 is synchronously discharged through multiple discharge ports (multiple drain elbows 1051), and synchronously pre-separated in multiple pre-separation vertical pipes 208. After being buffered by the depth adjustment plate 211, secondary separation is carried out near the depth adjustment plate 211. On the one hand, the two liquid phases after pre-separation can quickly reach near the interface, improving the separation efficiency. On the other hand, the buffered liquid has little disturbance to the interface and will not cause large fluctuations to the interface. Moreover, since the interface is near the depth adjustment plate 211, after the precise interface is determined by the optical interface detector 207, the vertical position of the depth adjustment plate 211 in the depth adjustment type liquid inlet mechanism can be slightly adjusted, so that the lower end of the vertical suction pipe 213 is located above the interface. In this way, the interface will not be disturbed during the suction process, and the organic phase can be quickly discharged.

[0053] As a preferred embodiment of the present invention, as Figure 13 , 14As shown, the flow-through extraction device 400 includes an upper movable frame 405, a lower fixed frame 402, two second vertical driving members 407, and a plurality of flow-through adjustment cylinders 401. The upper and lower ends of each flow-through adjustment cylinder 401 are respectively connected to the upper movable frame 405 and the lower fixed frame 402, and the lower part of the flow-through adjustment cylinder 401 is in transmission connection with the second driving mechanism. The two second vertical driving members 407 of this embodiment are symmetrically arranged on both sides of the lower fixed frame 402. Fixed wings 403 are respectively constructed at both ends of the lower fixed frame 402, and the fixed wings 403 fix the lower fixed frame 402 at the target position. Lower connecting ears 404 are symmetrically constructed on both sides of the middle of the lower fixed frame 402, and upper connecting ears 406 are symmetrically constructed on both sides of the middle of the upper movable frame 405. The lower connecting ears 404 and the upper connecting ears 406 on the same side are arranged up and down correspondingly, and the two ends of each second vertical driving member 407 are connected to the corresponding lower connecting ears 404 and upper connecting ears 406. The second vertical driving member 407 is preferably a vertical cylinder. The upper end of each flow-through adjustment cylinder 401 of this embodiment is communicated with the first liquid pipe 408, and the lower end of the flow-through adjustment cylinder 401 is respectively communicated with the second liquid pipe 409 and the third liquid pipe 410, and the second liquid pipe 409 and the third liquid pipe 410 are independent of each other and not communicated. The first liquid pipe 408 is used to transport the first liquid phase into each flow-through adjustment cylinder 401, and the second liquid pipe 409 is used to transport another liquid phase into each flow-through adjustment cylinder 401, and the two liquid phases are subjected to convective mixing in each flow-through adjustment cylinder 401, so that the mixing is fast and sufficient. After complete mixing, the mixed liquid is discharged through the third liquid pipe 410. The flow-through adjustment cylinder 401 of this embodiment adopts an upper and lower split structure. By controlling the action of the second vertical driving member 407, the volume of the mixing chamber of the flow-through adjustment cylinder 401 is adjusted, and then the mixing amount is adjusted. Moreover, by controlling the action of the second driving mechanism, the second driving mechanism drives the lower part of each flow-through adjustment cylinder 401 to rotate, so that the two liquid phases in the mixing chamber are disturbed and convected at the same time, improving the mixing efficiency and promoting Co 2+ rapid transfer.

[0054] As a preferred embodiment of the present invention, as Figures 16-21As shown, the convection regulating cylinder 401 includes an upper disc seat 40101 and a lower adapter ring 40109, which are arranged opposite to each other up and down. Two first fixing ears 40102 are symmetrically constructed on the upper disc seat 40101, and the two first fixing ears 40102 are detachably connected to the upper movable frame 405, respectively, and an outer sleeve 40108 is coaxially constructed at the lower end of the upper disc seat 40101. In this embodiment, two second fixing ears 40110 are symmetrically constructed on the lower adapter ring 40109, and the two second fixing ears 40110 are detachably connected to the lower fixing frame 402, and the lower adapter ring 40109 is rotatably sleeved on the lower part of the inner sleeve 40127, and the upper end of the inner sleeve 40127 is movably inserted into the outer sleeve 40108 by the lower end of the outer sleeve 40108, and a plurality of material disturbing blades 40128 are uniformly constructed along the circumference of the inner sleeve 40127, and the inner sleeve 40127 is in transmission connection with the second driving mechanism. In this embodiment, when the second driving mechanism drives the inner sleeve 40127 to rotate, the material disturbing blades 40128 in the inner sleeve 40127 disturb the liquid in the mixing chamber to improve the mixing efficiency. In this embodiment, an upper liquid pipe 40106 is constructed at the center of the upper end of the outer sleeve 40108. The upper liquid pipe 40106 extends upward in the vertical direction. A fifth control valve 40107 is installed on the upper liquid pipe 40106, and the upper end of the upper liquid pipe 40106 is connected to the first liquid pipe 408. The upper end wall of the outer sleeve 40108 protrudes downward and forms an upper jet portion 40103. A first jet cavity 40104 is constructed in the upper jet portion 40103. The first jet cavity 40104 is connected to the upper liquid pipe 40106. A plurality of first jet holes 40105 are distributed at the lower end of the upper jet portion 40103. These first jet holes 40105 are connected to the first jet cavity 40104. In this way, after the first liquid phase enters the first jet cavity 40104, it is jetted into the mixing cavity in an outwardly divergent form. In this embodiment, a down pipe 40114 is constructed at the center of the inner sleeve 40127. The down pipe 40114 extends downward in a vertical direction. The down pipe 40114 is connected to the inner cavity of the inner sleeve 40127 through the lower end wall of the inner sleeve 40127, so that the down pipe 40114 is directly connected to the mixing chamber. An outer sleeve 40115 is provided on the outer side of the lower liquid pipe 40114, and the lower end wall of the inner sleeve 40127 protrudes upward to form a lower jet portion 40111, in which a second jet cavity 40112 is constructed, and the second jet cavity 40112 is communicated with the outer sleeve 40115, and a plurality of second jet holes 40113 are distributed on the upper end of the lower jet portion 40111, and these second jet holes 40113 are communicated with the second jet cavity 40112, the lower liquid pipe 40114 is communicated with the second liquid pipe 409, and the outer sleeve 40115 is communicated with the third liquid pipe 410.In this embodiment, a connection cover 40123 is detachably installed at the lower end of the outer sleeve 40115. The connection cover 40123 closes the lower end of the outer sleeve 40115. A fixing sleeve 40124 is constructed at the center of the connection cover 40123. The fixing sleeve 40124 is sleeved outside the lower liquid pipe 40114. The lower end of the lower liquid pipe 40114 passes through the connection cover 40123. A vertical pipe 40125 is rotatably connected to the lower end of the lower liquid pipe 40114. The vertical pipe 40125 communicates with the third liquid pipe 410. A seventh control valve 40126 is installed on the vertical pipe 40125. In this embodiment, a plurality of communication holes 40118 are formed in the outer sleeve 40115. A transfer sleeve 40119 is sleeved outside the outer sleeve 40115. The outer sleeve 40115 is rotatably connected to the transfer sleeve 40119. A conduction cavity 40120 is formed in the transfer sleeve 40119. A transfer pipe 40121 is connected to the transfer sleeve 40119. The transfer pipe 40121 communicates with the second liquid pipe 409. A sixth control valve 40122 is installed on the transfer pipe 40121. In this embodiment, a first channel 40116 is formed in the lower liquid pipe 40114. A second channel 40117 is formed inside the outer sleeve 40115 and outside the lower liquid pipe 40114. The first channel 40116 directly communicates with the mixing cavity. The second channel 40117 indirectly communicates with the mixing cavity through the second jet cavity 40112 and the second jet holes 40113. Another liquid phase enters the conduction cavity 40120 of each transfer sleeve 40119 through the second liquid pipe 409, then enters the second jet cavity 40112 through the second channel 40117, and then jets into the mixing cavity in a diverging shape. In this way, the two dispersed and jetting liquid phases intersect with each other, thereby promoting the sufficiency of mixing. After the mixing is completed, the mixed liquid is discharged into the third liquid pipe 410 through the lower liquid pipe 40114 and finally discharged.

[0055] As a preferred embodiment of the present invention, as Figure 14 , 15As shown, a plurality of mounting plates 411 are installed at intervals on the lower fixing frame 402. The second driving mechanism of this embodiment includes a second driving motor 412, a second chain 415, a plurality of second transmission sprockets 413 and a plurality of second transfer sprockets 414, wherein the plurality of second transmission sprockets 413 are assembled with the outer sleeves 40115 of the plurality of convection regulating cylinders 401, and each second transmission sprocket 413 is coaxially fixed with the corresponding outer sleeve 40115. A second transfer sprocket 414 is installed on each mounting plate 411, and the second transfer sprocket 414 is located between the two second transmission sprockets 413. The second chain 415 transmission connects all the second transmission sprockets 413 and all the second transfer sprockets 414. There are two second drive motors 412 in this embodiment, and the two second drive motors 412 are respectively installed on the two mounting plates 411. The output shaft of each second drive motor 412 is connected to the corresponding second transfer sprocket 414 and is used to drive the second transfer sprocket 414 to rotate, thereby causing each inner sleeve 40127 to rotate, thereby achieving the purpose of continuously disturbing the liquid in the mixing chamber by the disturbing blades 40128.

[0056] The present invention also discloses a method for separating cobalt and magnesium using the above-mentioned cobalt-nickel hydrometallurgical system, comprising the following steps:

[0057] Step 1. Add a predetermined amount of organic phase into the wave-making mixing device 100, and then add the Co 2+ The water phase is gradually added into the wave-making mixing device 100 according to a predetermined amount, so that surging waves are formed in the wave-making mixing device 100;

[0058] Step 2. Wait until the Co 2+ After the water phase is completely added into the wave-making mixing device 100, the mixed liquid in the wave-making mixing device 100 is circulated, so that the mixed liquid in the wave-making mixing device 100 is always in a surging state;

[0059] Step 3. After the mixing is completed, the mixed liquid is supplied to the depth-adjustable clarification device 200, so that the mixed liquid is gravity-stratified in the depth-adjustable clarification device 200, and the Co 2+ The organic phase and the aqueous phase are separated;

[0060] Step 4. 2+ The organic phase is extracted from the depth-adjusting clarification device 200 and then supplied to the countercurrent extraction device 400, and the aqueous phase is simultaneously supplied to the countercurrent extraction device 400 for countercurrent mixing;

[0061] Step 5. After mixing, discharge to the first liquid collecting tank 300 for stratification, and discharge the raffinate into the first collecting kettle;

[0062] Step 6. Supply the extracted organic phase into the washing device 500, and use dilute acid to wash the organic phase to remove the entrained Mg 2+ impurities;

[0063] Step 7. Pass the washed product into the countercurrent stripping device 600, and at the same time supply strong acid into the countercurrent stripping device 600. After sufficient mixing, transfer it to the second liquid collecting tank 700, and perform gravity separation in the second liquid collecting tank 700 to strip Co 2+ from the organic phase into the aqueous phase, and then discharge the raffinate to the second collecting kettle to obtain a high-purity cobalt solution.

[0064] In this embodiment, the extractant is usually di(2-ethylhexyl)phosphoric acid. During extraction, the pH value is controlled within the range of 4-6. Generally, the pH value is adjusted by sodium hydroxide or sodium carbonate. Cobalt ions are preferentially extracted, while magnesium ions remain in the aqueous phase. During washing and stripping, after diluting and washing the loaded organic phase, hydrochloric acid or sulfuric acid is used for stripping to obtain a high-purity cobalt solution. And in each process involving the mixing of the organic phase and the aqueous phase, the phase ratio of the organic phase to the aqueous phase is 1:1 - 1:3.

[0065] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A cobalt-magnesium separation system for cobalt-nickel hydrometallurgy, characterized in that: The invention comprises a wave-making mixing device, a depth-adjusting clarification device, a convection extraction device, a first liquid collecting tank, a washing device, a convection stripping device and a second liquid collecting tank connected in sequence, wherein the convection extraction device and the convection stripping device have the same structure, the convection extraction device is connected to a first collecting kettle, and the convection stripping device is connected to a second collecting kettle; the depth-adjusting clarification device comprises a clarification tank and a depth-adjusting liquid inlet mechanism, the depth-adjusting liquid inlet mechanism is movably assembled in the clarification tank and is driven to move in a vertical direction, a liquid outlet pipe is connected to the lower part of a side wall of one side of the clarification tank, and a transparent observation device is installed on the side wall of the other side of the clarification tank mirror, an optical interface detector is installed at the transparent observation mirror; the depth-adjustable liquid inlet mechanism includes a depth-adjusting plate slidably assembled in the clarification tank, a plurality of pre-separation vertical pipes are installed side by side on the depth-adjusting plate, a liquid outlet is constructed at the connection between each of the pre-separation vertical pipes and the depth-adjusting plate, a swirl blade is constructed in the pre-separation vertical pipe, vertical suction pipes are respectively constructed at both ends of the depth-adjusting plate, the lower end of the vertical suction pipe passes through the depth-adjusting plate, the upper end of the vertical suction pipe is connected to a suction hose, two vertical hydraulic cylinders are symmetrically installed on both sides of the clarification tank, and the upper end of each of the vertical hydraulic cylinders is connected to the upper part of the corresponding vertical suction pipe.

2. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 1, wherein: The wave-making mixing device includes a mixing tank and a plurality of wave-making mechanisms, wherein the plurality of wave-making mechanisms are installed side by side on the side wall of one side of the mixing tank, and the wave-making mechanisms are all connected to a transverse adapter seat, and a first driving mechanism for driving the wave-making mechanism to rotate is arranged between the transverse adapter seat and the wave-making mechanisms, and an opening and closing type liquid discharge mechanism is connected to the lower part of the other side wall of the mixing tank, and the opening and closing type liquid discharge mechanism is respectively connected to a depth-adjustable clarification device and a circulation pump, and the circulation pump is connected to each wave-making mechanism through a distribution pipe system.

3. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 2, wherein: The wave-making mechanism includes a liquid inlet pipe rotatably mounted on the side wall of the mixing tank, a wave-making head is constructed at one end of the liquid inlet pipe extending into the mixing tank, the wave-making head is connected to the liquid inlet pipe, an end face of the wave-making head away from the liquid inlet pipe protrudes outward and forms a liquid discharge end face, a plurality of strip-shaped oblique flow ports are evenly opened on the liquid discharge end face along its circumference, the other end of the liquid inlet pipe is connected to the distribution pipe system, and the liquid inlet pipe is transmission-connected to the first driving mechanism.

4. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 3, wherein: A spherical joint is constructed between the liquid inlet pipe and the wave-making head, and a bowl-shaped joint is installed on the side wall of the mixing tank. The spherical joint is movably installed in the bowl-shaped joint; the distribution pipe system includes a liquid inlet main pipe, and a plurality of liquid inlet branches are connected to the liquid inlet main pipe. Each of the liquid inlet branches passes through a transverse adapter seat and is rotatably connected to the end of the corresponding liquid inlet pipe. A rubber joint pipe connected to the outlet of the circulation pump is constructed on the liquid inlet main pipe; both ends of the transverse adapter seat are connected to the connecting frame through adapter components.

5. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 1, wherein: The convection extraction device includes an upper movable frame, a lower fixed frame, two second vertical driving members and a plurality of convection regulating cylinders, the upper and lower ends of each of the convection regulating cylinders are respectively connected to the upper movable frame and the lower fixed frame, and the lower part of the convection regulating cylinder is transmission-connected to the second driving mechanism, the two second vertical driving members are symmetrically arranged on both sides of the lower fixed frame, and the two ends of each second vertical driving member are respectively connected to the upper movable frame and the lower fixed frame, the upper end of each convection regulating cylinder is connected to the first liquid pipe, and the lower end of the convection regulating cylinder is respectively connected to the second liquid pipe and the third liquid pipe which are independent of each other.

6. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 5, characterized in that: The convection regulating cylinder includes an upper disc seat and a lower adapter ring which are arranged relatively to each other in the upper and lower directions. The upper disc seat is detachably connected to the upper movable frame. An outer sleeve is coaxially constructed at the lower end of the upper disc seat. The lower adapter ring is detachably connected to the lower fixed frame. The lower adapter ring is rotatably sleeved on the outside of the inner sleeve. The upper end of the inner sleeve is movably inserted into the outer sleeve by the lower end of the outer sleeve. A plurality of material disturbing blades are evenly constructed in the inner sleeve along its circumference, and the inner sleeve is transmission-connected to the second driving mechanism.

7. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 6, characterized in that: An upper liquid pipe extending upward is constructed at the center of the upper end of the outer sleeve, the upper liquid pipe is connected to the first liquid pipe, the upper end wall of the outer sleeve protrudes downward to form an upper jet part, a first jet cavity connected to the upper liquid pipe is constructed in the upper jet part, and a plurality of first jet holes connected to the first jet cavity are distributed at the lower end of the upper jet part; a lower liquid pipe extending downward is constructed at the center of the inner sleeve, the lower liquid pipe is connected to the inner cavity of the inner sleeve through the lower end wall of the inner sleeve, an outer sleeve is mounted on the outer side of the lower liquid pipe, the lower end wall of the inner sleeve protrudes upward to form a lower jet part, a second jet cavity connected to the outer sleeve is constructed in the lower jet part, a plurality of second jet holes connected to the second jet cavity are distributed at the upper end of the lower jet part, the lower liquid pipe is connected to the second liquid pipe, and the outer sleeve is connected to the third liquid pipe.

8. A method for a cobalt-magnesium separation system using cobalt-nickel hydrometallurgy as described in any one of claims 1-7, characterized in that, The steps include: Step 1. Add a predetermined amount of organic phase into the wave-making mixing device, and then gradually add the aqueous phase containing Co 2+ into the wave-making mixing device according to a predetermined amount, and make surging waves form in the wave-making mixing device; Step 2. After the aqueous phase containing Co 2+ is completely added into the wave-making mixing device, circulate the mixed liquid in the wave-making mixing device so that the mixed liquid in the wave-making mixing device is always in a surging state; Step 3. After mixing, supply the mixed solution into the depth-adjustable clarification device, so that the mixed solution undergoes gravity stratification in the depth-adjustable clarification device, and stratify the organic phase containing Co 2+ from the aqueous phase; Step 4. Withdraw the organic phase containing Co 2+ from the draw-down type clarification device and supply it to the countercurrent extraction device. At the same time, supply the aqueous phase to the countercurrent extraction device for countercurrent mixing; Step 5. After mixing, discharge to the first liquid collecting tank for stratification, and discharge the raffinate into the first collecting kettle; Step 6. Supply the extracted organic phase into a washing device, and use dilute acid to wash the organic phase to remove the entrained Mg 2+ impurities; Step 7. Feed the washed product into the countercurrent back-extraction device, and at the same time supply strong acid to the countercurrent back-extraction device. After sufficient mixing, transfer it to the second liquid collection tank, and perform gravity separation in the second liquid collection tank to back-extract Co 2+ from the organic phase to the aqueous phase, and then discharge the raffinate to the second collection kettle to obtain a high-purity cobalt solution.

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