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

Abstract

The invention discloses a cobalt-magnesium separation system and method for cobalt-nickel hydrometallurgy, the system comprises a wave-making type mixing device, a depth-adjusting type clarification device, a convection type extraction device, a first liquid collecting tank, a washing device, a convection type back extraction device and a second liquid collecting tank which are connected in sequence, and the convection type extraction device and the convection type back extraction device have the same structure; the convection type extraction device is communicated with a first collection kettle, and the convection type back extraction device is communicated with a second collection kettle; according to the method, the system is used for carrying out wet separation on cobalt and magnesium to obtain a high-purity cobalt solution. In the small-scale extraction operation of cobalt and magnesium, the extraction efficiency is improved, it is ensured that a high-purity cobalt solution can be obtained, the space occupied by equipment is reduced, the input cost is reduced, and the operation process is simplified. The method is suitable for the technical field of cobalt-magnesium separation.

Description

Technical Field

[0001] The present invention belongs to the technical field of cobalt-magnesium separation, and in particular, relates to a cobalt-magnesium separation system and method for cobalt-nickel hydrometallurgy. Background Art

[0002] Existing cobalt-magnesium separation technologies usually use solvent extraction, precipitation, ion exchange or membrane separation. Among them, solvent extraction is widely used because of its low investment cost, and the organic phase used for extraction can be recycled and reused, and the extraction effect and purity are high. In the extraction process, mixing and settling tanks, extraction towers, stripping equipment, etc. are mainly used to separate Co and magnesium. 2+ Extracted to obtain a high-purity cobalt solution. However, when performing the mixing and clarifying operation in the mixing and clarifying tank, the aqueous phase and the organic phase need to be mixed and layered again. In this way, two steps are performed in the mixing and clarifying tank, and it takes a long time to complete the two steps. The operation efficiency is low, and the mixing is usually carried out by mechanical stirring. In order to ensure the adequacy of the mixing, the stirring time needs to be extended. And because the extraction tower is used for the extraction operation, its volume is large and the control is more complicated, which is not conducive to small-scale continuous production operations; the back extraction equipment also adopts the same structure as the extraction tower, and its disadvantages are the same as the extraction tower. Whether it is extraction or back extraction, it is necessary to mix the aqueous phase and the organic phase. In small-scale continuous production operations, the two liquid phases with low flow cannot be ensured to be fully mixed after entering the extraction tower, resulting in poor extraction effect. Summary of the invention

[0003] The present invention provides a cobalt-magnesium separation system and method for cobalt-nickel hydrometallurgy, which is used for small-scale extraction operations, improves extraction efficiency, ensures that a high-purity cobalt solution is obtained, reduces the space occupied by the equipment, reduces investment costs, and simplifies the operation process.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A cobalt-magnesium separation system for cobalt-nickel hydrometallurgy 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 which are connected in sequence. 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.

[0005] 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] The present invention also discloses a method for separating cobalt and magnesium using the above-mentioned cobalt-nickel hydrometallurgical system, comprising the following steps: 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; 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; Step 3. After the mixing is completed, the mixed liquid is supplied to a depth-adjustable clarification device, so that the mixed liquid is gravity-stratified in the depth-adjustable clarification device, and the Co 2+The organic phase and the aqueous phase are separated; Step 4. 2+ The organic phase is extracted from the depth-adjusting clarification device and then supplied to the countercurrent extraction device, and the aqueous phase is simultaneously supplied 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. The organic phase after extraction is supplied to a washing device, and diluted acid is used to wash the organic phase to remove the entrained Mg 2+ Impurities; Step 7. The washed product is passed into a countercurrent stripping device, and a strong acid is supplied to the countercurrent stripping device. After sufficient mixing, the product is transferred to a second liquid collecting tank, and gravity stratified in the second liquid collecting tank to separate the Co 2+ The organic phase is extracted into the aqueous phase, and the raffinate is discharged into the second collecting kettle to obtain a high-purity cobalt solution.

[0014] Due to the above structure, the present invention has achieved technical progress compared with the prior art in that: the present invention includes Co 2+ The water phase is injected into the wave-making mixing device by wave-making, so that the water phase is mixed with the organic phase in the wave-making mixing device. Since the water phase moves in the organic phase in the form of surging waves, the two liquid phases are fully mixed. 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 by wave-making, ensuring Co 2+ Rapidly and fully exchange the values ​​in the organic phase. The present invention adopts a depth-adjustable clarification device to stratify the mixed liquid. The mixed liquid is divided into multiple branches and enters the depth-adjustable clarification device synchronously. It is pre-stratified during the entry process, and then converges at the boundary of the two liquid phases of the depth-adjustable clarification device to perform secondary stratification. Moreover, as the liquid level rises, the interface between the two liquid phases gradually rises (the total amount of liquid in the depth-adjustable clarification device increases, and the interface will naturally rise accordingly). The depth-adjustable part in the depth-adjustable clarification device is controlled to gradually move upward. The lower part of the depth-adjustable part is always close to the interface between the two liquid phases. After the mixed liquid is pre-separated, it is always transported to the vicinity of the interface, and the lower part of the depth-adjustable part slows down the pre-separated mixed liquid flowing to the interface, avoiding disturbance of the two liquid phases at the interface, so that the pre-separated mixed liquid has better stratification effect and efficiency at the interface. The convection extraction device and the convection stripping device of the present invention adopt the same structure, and the two liquid phases are fully mixed by convection, and the Co 2+ Extraction and stripping to ensure Mg 2+Impurities are fully removed, and the purity of the cobalt solution is improved. Moreover, the wave-making mixing device, depth-adjusting clarification device, convection extraction device and convection stripping device of the present invention are all small-scale equipment, which are suitable for small-scale cobalt-magnesium separation operations. In summary, 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 investment cost, and simplifies the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture: Figure 1 is a flowchart of an embodiment of the present invention; Figure 2 It is a structural schematic diagram of the connection between the wave-making mixing device and the depth-adjusting clarification device according to an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a wave-making mixing device according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the wave-making mixing device from another angle according to an embodiment of the present invention; Figure 5 It is a partial structural schematic diagram of the first driving mechanism in the wave-making mixing device according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the disassembled opening and closing type liquid discharge mechanism in the wave-making type mixing device according to an embodiment of the present invention; Figure 7 It is a structural schematic diagram of the connection between the wave-making mechanism and the mixing tank in the wave-making mixing device according to an embodiment of the present invention; Figure 8 It is a schematic structural diagram of the wave-making mechanism and the mixing tank in the wave-making mixing device according to an embodiment of the present invention after being separated; Fig. 9 It is a structural schematic diagram of a wave-making mechanism in a wave-making mixing device according to an embodiment of the present invention; Fig.10 It is a structural schematic diagram of a depth-adjustable clarification device according to an embodiment of the present invention; Fig.11 It is a partial structural cross-sectional view of the depth-adjustable clarification device according to an embodiment of the present invention; Fig.12 It is a structural schematic diagram of a depth-adjustable liquid inlet mechanism in a depth-adjustable clarification device according to an embodiment of the present invention; Fig.13 It is a structural schematic diagram of a convection extraction device according to an embodiment of the present invention; Fig.14It is a structural schematic diagram of the convection extraction device according to another angle of the embodiment of the present invention; Fig.15 It is a partial structural schematic diagram of the second driving mechanism in the convection extraction device according to an embodiment of the present invention; Fig.16 It is a schematic structural diagram of a convection regulating cylinder in a convection extraction device according to an embodiment of the present invention; Fig.17 It is an axial structural cross-sectional view of a convection regulating cylinder in a convection extraction device according to an embodiment of the present invention; Fig.18 for Fig.17 A magnified view of the structure of the middle A part; Fig.19 This is an exploded view of the structure of the convection regulating cylinder of the embodiment of the present invention after removing the upper disc seat and the outer sleeve; Fig. 20 It is a partial structural schematic diagram of the connection between the lower adapter ring and the inner sleeve in the convection regulating cylinder of the embodiment of the present invention; Fig.21 It is a schematic diagram of the partial structure of the connection between the upper disc seat and the outer sleeve in the convection regulating cylinder of an embodiment of the present invention.

[0017] Labeled parts: 100-wave-making mixing device, 101-mixing tank, 102-first drive mechanism, 1021-first drive motor, 1022-first transmission sprocket, 1023-first transfer sprocket, 1024-first chain, 103-wave-making mechanism, 1031-connecting flange, 1032-bowl-shaped joint, 1033-liquid inlet pipe, 1034-ball joint, 1035-wave-making head, 1036-strip oblique 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-opening and closing type liquid discharge mechanism, 1051-liquid discharge elbow, 1052-assembly set, 1053-transverse conduit, 1054-first Conducting hole, 1055-second conducting hole, 1056-operating hand wheel, 106-return liquid pipe, 107-second control valve, 108-liquid inlet joint, 109-third control valve, 110-circulating pump, 111-liquid outlet joint, 112-lateral adapter seat, 113-lateral rod, 114-first hard spring, 115-first vertical driving member, 116-second hard 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 hole, 207-optical interface detector, 208-pre-separation vertical pipe, 209-liquid inlet bucket, 210-rotating Flow blade, 211-depth adjustment plate, 212-liquid outlet, 213-vertical suction pipe, 214-suction hose, 215-vertical hydraulic cylinder, 300-first liquid collecting tank, 400-convection extraction device, 401-convection adjustment cylinder, 40101-upper disc seat, 40102-first fixing 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 adapter ring, 40110-second fixing ear, 40111-lower jet part, 40112-second jet cavity, 40113-second jet hole, 40114-lower liquid pipe, 40115-outer sleeve, 40116-first channel, 40117-second channel, 40118-connecting hole, 40119-adapter sleeve, 40120-conducting cavity, 40121-adapter tube, 40122-sixth control valve, 40123-connecting cover, 40124-fixing sleeve, 40125-vertical tube, 40126-seventh control valve, 40127-inner sleeve, 40128-disturbing blade, 402-lower fixed 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 drive motor, 413-second transmission sprocket,414-second transfer sprocket, 415-second chain, 500-washing device, 600-convection stripping device, 700-second liquid collecting tank. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0019] The present invention discloses a cobalt-magnesium separation system for cobalt-nickel hydrometallurgy, such as Figure 1-21 As shown, it includes a wave-making mixing device 100, a depth-adjusting clarification device 200, a countercurrent extraction device 400, a first liquid collecting tank 300, a washing device 500, a countercurrent stripping device 600 and a second liquid collecting tank 700 connected in sequence. The countercurrent extraction device 400 and the countercurrent stripping device 600 have the same structure. The countercurrent extraction device 400 is connected to a first collecting kettle, and the countercurrent stripping device 600 is connected to a second collecting kettle. The washing device 500 is generally a small mixing and clarifying tank 201, or another set of wave-making mixing devices 100 and depth-adjusting clarification devices 200 are selected. The working principle and advantages of the present invention are: the present invention converts the Co-containing 2+ The water phase is injected into the wave-making mixing device 100 by wave-making, so that the water phase is mixed with the organic phase in the wave-making mixing device 100. Since the water phase moves in the organic phase in the form of surging waves, the two liquid phases are fully mixed. 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 by wave-making, ensuring Co 2+ Rapidly and fully exchange the value in the organic phase. The present invention adopts a depth-adjustable clarification device 200 to perform stratification of the mixed liquid. The mixed liquid is divided into multiple branches and enters the depth-adjustable clarification device 200 synchronously. It is pre-stratified during the entry process, and then converges at the boundary of the two liquid phases of the depth-adjustable clarification device 200 for secondary stratification. Moreover, as the liquid level rises, the boundary surface of the two liquid phases gradually rises (the total amount of liquid in the depth-adjustable clarification device 200 increases, and the boundary surface will naturally rise accordingly). The depth-adjustable part in the depth-adjustable clarification device 200 is controlled to gradually move upward. The depth-adjustable part is always close to the boundary surface of the two liquid phases. After the mixed liquid is pre-separated, it is always transported to the vicinity of the boundary surface, and the lower part of the depth-adjustable part slows down the pre-separated mixed liquid flowing to the boundary surface, avoiding disturbance of the two liquid phases at the boundary surface, so that the effect and efficiency of stratification of the pre-separated mixed liquid at the boundary surface are better. The convection extraction device 400 and the convection stripping device 600 of the present invention adopt the same structure, and the two liquid phases are fully mixed by convection, and the Co 2+Extraction and stripping to ensure Mg 2+ Impurities are fully removed, and the purity of the cobalt solution is improved. Moreover, the wave-making mixing device 100, the depth-adjusting clarification device 200, the convection extraction device 400 and the convection stripping device 600 of the present invention are all small-scale equipment, which are suitable for small-scale cobalt-magnesium separation operations. In summary, 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 investment cost, and simplifies the operation process.

[0020] As a preferred embodiment of the present invention, Figure 3 , 4As shown, the wave-making mixing device 100 includes a mixing tank 101, a transverse adapter seat 112, a first driving mechanism 102, a distribution pipe system 104, an opening and closing type liquid discharge mechanism 105 and a plurality of wave-making mechanisms 103. The plurality of wave-making mechanisms 103 are installed side by side on the side wall of one side of the mixing tank 101, and the wave-making mechanisms 103 are all connected to the transverse adapter seat 112. The first driving mechanism 102 is assembled between the transverse adapter seat 112 and the 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 discharge mechanism 105 is connected to the lower position of the other side wall of the mixing tank 101, and the opening and closing type liquid discharge mechanism 105 is respectively connected to the depth-adjusting type clarification device 200 and the circulation pump 110, and the circulation pump 110 is connected to each wave-making mechanism 103 through the distribution pipe system 104. The working principle and advantages of this embodiment are: this embodiment can control the action of the first driving mechanism 102 according to demand, so that it drives each wave-making mechanism 103 to rotate and perform large-scale swirl wave-making operations. It is also not necessary to control the action of the first driving mechanism 102, so that each wave-making mechanism 103 is in a non-rotating state, and the water phase is evenly distributed to each wave-making mechanism 103 through the distribution pipe system 104, and then the wave-making mechanism 103 is ejected into the mixing tank 101, so that multiple continuous high-pressure water flows are formed in the mixing tank 101, and these water flows make the liquid in the mixing tank 101 form multiple waves, and the boundaries of the high-pressure water flows ejected by 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 water 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 pipe system 104 through the opening and closing type liquid discharge mechanism 105, and then the distribution pipe system 104 supplies it to each wave-making mechanism 103, and then the jet enters the mixing tank 101, so that the mixed liquid is discharged from the mixing tank 101 in a circulating state and then enters the mixing tank 101, 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 water phase are completely exchanged into the organic phase, the opening and closing type liquid discharge mechanism 105 is adjusted to make the mixing tank 101 communicate with the depth-adjusting type clarification device 200, so that the mixed liquid is continuously supplied from the mixing tank 101 to the depth-adjusting type clarification device 200.

[0021] As a preferred embodiment of the present invention, Figure 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 mounted on the side wall of the mixing tank 101, the wave-making head 1035 is constructed at one end of the liquid inlet pipe 1033 extending into the mixing tank 101, the wave-making head 1035 is connected to the liquid inlet pipe 1033, the end face of the wave-making head 1035 away from the liquid inlet pipe 1033 is convex outward and forms a liquid discharge end face, and a plurality of strip-shaped oblique flow ports 1036 are evenly provided on the liquid discharge end face along its circumference, the other end of the liquid inlet pipe 1033 is connected to the distribution pipe system 104, and the liquid inlet pipe 1033 is transmission-connected to the first driving mechanism 102. The water phase or the mixed liquid enters the liquid inlet pipe 1033 through the distribution pipe system 104, and then jets out through each strip-shaped oblique flow port 1036 on the wave-making head 1035, thereby forming a certain degree of swirl. When the vortex strength needs to be enhanced, the first driving mechanism 102 can be controlled to drive the liquid inlet pipe 1033 to drive the wave-making head 1035 to rotate, so that the vortex of the liquid from the wave-making head 1035 is increased, and the water phase and the organic phase are fully blended and mixed. This embodiment can adjust the connection angle between the wave-making mechanism 103 and the mixing tank 101. Specifically, a plurality of assembly openings 117 are provided on the side wall of the mixing tank 101. These assembly openings 117 are arranged one-to-one with the plurality of wave-making mechanisms 103. A fixed edge 118 is formed at the outer edge of each assembly opening 117. A bowl-shaped joint 1032 is provided at the assembly opening 117. A connecting flange 1031 is constructed at the outer edge of the bowl-shaped joint 1032. The bowl-shaped joint 1032 is divided into two halves, and the connecting flange 1031 is also divided into two halves. The connecting flange 1031 is detachably connected to the fixed edge 118, and the bowl-shaped joint 1032 is connected to the mixing tank 101 through the assembly opening 117. A spherical joint 1034 is constructed 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. Figure 3 , 5As shown, the first driving motor 1021 of the present 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 mounted one by one on the corresponding liquid inlet pipe 1033, the first transfer sprockets 1023 are rotatably mounted side by side on the transverse transfer seat 112, and the two sides of each first transfer sprocket 1023 are respectively provided with a first transmission sprocket 1022, that is, a first transfer sprocket 1023 is arranged between every two adjacent first transmission sprockets 1022, and the first chain 1024 transmission connects all the first transmission sprockets 1022 and all the first transfer sprockets 1023, and the function of the first transfer sprocket 1023 is to promote the effective transmission connection between the first transmission sprocket 1022 and the first chain 1024. In this embodiment, there are two first drive motors 1021, both of which are mounted on the lateral adapter seat 112, and the output shaft of the first drive motor 1021 is coaxially connected with the corresponding first adapter sprocket 1023. When the first drive motor 1021 is controlled to operate, it drives each wave-making mechanism 103 to rotate through the transmission method of the sprocket.

[0022] As a preferred embodiment of the present invention, Figure 3 , 4As shown in Figure 6, the distribution pipe system 104 includes a liquid inlet main pipe 1041, on which a plurality of liquid inlet branch pipes 1043 are connected, each liquid inlet branch pipe 1043 passes through a transverse adapter seat 112, and the end of the liquid inlet branch pipe 1043 corresponding to the liquid inlet pipe 1033 is rotatably connected, a first control valve 1044 is installed on the liquid inlet branch pipe 1043, and a rubber joint pipe 1042 is constructed on the liquid inlet main pipe 1041, and the rubber joint pipe 1042 is connected to the outlet of the circulation pump 110. The two ends of the transverse adapter seat 112 of this embodiment are connected to the connecting frame through the adapter assembly. The specific structure of the adapter assembly is that the adapter assembly includes a transverse rod 113 and a first vertical driving member 115. One end of the transverse rod 113 is fixedly connected to one end of the transverse adapter seat 112 through a first hard spring 114. The lower end of the first vertical driving member 115 is hinged to the transverse 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, in the process of controlling the action of the first vertical driving member 115, the transverse adapter seat 112 drives each wave-making mechanism 103 to adjust a certain angle upward or downward with the bowl-shaped joint 1032 as a point through the distribution pipe system 104, so that the wave-making head 1035 is tilted upward or tilted downward to jet, so as to achieve all-round and dead-angle-free disturbance of the liquid in the mixing tank 101. In this embodiment, a second hard spring 116 is installed at the output end of the first vertical driving member 115. The second hard spring 116 and the first hard spring 114 mentioned above both play the role of buffering and energy absorption, and compensate for the corresponding positions of the transverse adapter 112, the transverse rod 113 and the first vertical driving member 115. The specific structure of the opening and closing type liquid discharge mechanism 105 in this embodiment is that the opening and closing type liquid discharge mechanism 105 includes a transverse guide tube 1053 and a plurality of liquid discharge elbows 1051, which are arranged side by side, one end of each liquid discharge elbow 1051 extends horizontally and communicates with the lower part of one side of the mixing tank 101, and the other end of the liquid discharge elbow 1051 is bent and extends vertically downward; a mounting sleeve 1052 is constructed on each liquid discharge elbow 1051, the axis of the mounting sleeve 1052 is perpendicular to the axis of the horizontal part of the liquid discharge elbow 1051, and the mounting sleeve 1052 is connected to the liquid discharge elbow 1051. One end of the transverse conduit 1053 of the present embodiment passes through each assembly sleeve 1052 in sequence, and two first conducting holes 1054 and one second conducting hole 1055 are opened on the transverse conduit 1053 and located inside the discharge elbow 1051. The two first conducting holes 1054 are symmetrically arranged, and the second conducting hole 1055 is located between the two first conducting holes 1054.An operating hand wheel 1056 is installed at one end of the transverse conduit 1053, and the other end of the transverse 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 connected to the inlet end of the circulation pump 110, and the outlet end of the circulation pump 110 is connected to the liquid outlet joint 111, which is connected to 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 hand wheel 1056, the transverse conduit 1053 is rotated to a certain angle. When the second conducting pipe is connected to the horizontal part of the liquid discharge elbow 1051, the transverse conduit 1053 closes the vertical part of the liquid discharge elbow 1051. At this time, the mixing tank 101 is connected to the liquid return pipe 106 through the transverse conduit 1053, and the circulation pump 110 can be controlled to circulate the mixed liquid. When the operating hand wheel 1056 is rotated to connect the two first conducting holes 1054 to the horizontal and vertical parts of the discharge elbow 1051, the second control valve 107 is closed. At this time, the mixed liquid in the mixing tank 101 can be diverted and synchronously supplied to the depth-adjustable clarification device 200.

[0023] As a preferred embodiment of the present invention, Figure 10-12As shown, the depth-adjustable clarification device 200 includes a clarification tank 201 and a depth-adjustable liquid inlet mechanism (the depth-adjustable part mentioned above). The depth-adjustable liquid inlet mechanism is movably mounted 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 the side wall of one side 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 side wall of the other side of the clarification tank 201, and an adapter plate 205 is installed at the transparent observation mirror 204. A vertical strip hole 206 is opened on the adapter plate 205. An optical interface detector 207 is detachably connected to the vertical strip 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-adjusting liquid inlet mechanism is controlled to move in the vertical direction in real time, so that the lower part of the depth-adjusting liquid inlet mechanism is always close to the position of the interface. The depth-adjusting liquid inlet mechanism of this embodiment includes a depth-adjusting plate 211 and a plurality of pre-separation vertical pipes 208, which are installed side by side on the depth-adjusting plate 211. A liquid inlet hopper 209 is constructed at the upper end of each pre-separation vertical pipe 208, and a plurality of swirl blades 210 are constructed in the pre-separation vertical pipe 208. These swirl blades 210 are evenly arranged along the circumference 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 adjusting plate 211, and a plurality of holes are opened on the depth adjusting plate 211 to facilitate the pre-separation liquid from the liquid outlet 212 to smoothly and gently pass through the depth adjusting plate 211 into the clarification tank 201. In this embodiment, vertical suction pipes 213 are respectively constructed at both ends of the depth adjustment plate 211, and the lower end of each vertical suction pipe 213 penetrates the depth adjustment plate 211, and the vertical suction pipe 213 is connected to the area of ​​the clarification tank 201 located at the lower part of the depth adjustment plate 211. Vertical hydraulic cylinders are respectively installed on both sides of the clarification tank 201, and the upper ends of the two vertical suction pipes 213 are 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 adjustment plate 211 to move vertically by driving the two vertical suction pipes 213, so that the depth adjustment plate 211 and the interface are close to each other. In this embodiment, a suction hose 214 is connected to the upper end of at least one vertical suction pipe 213, and one of the two stratified liquid phases is gradually sucked out by sucking the suction hose 214. In this embodiment, the height of the lower end surface of the mixing tank 101 is higher than the height of the upper end surface of the clarifying tank 201, so that a liquid level difference is formed between the mixing tank 101 and the clarifying tank 201, so that the mixed liquid can smoothly enter the interface area of ​​the clarifying tank 201 from the mixing tank 101.In this embodiment, the mixed liquid in the mixing tank 101 is discharged through multiple discharge ports (multiple liquid discharge elbows 1051) synchronously, and then pre-separated synchronously in multiple pre-separation vertical pipes 208, and then buffered by the depth adjustment plate 211, and then secondary separation is performed near the depth adjustment plate 211; on the one hand, the two liquid phases pre-separated can quickly reach the vicinity of the interface, which improves the separation efficiency, and on the other hand, the buffered liquid has a negligible disturbance to the interface and will not cause large fluctuations in the interface. Moreover, since the interface is near the depth adjustment plate 211, the vertical position of the depth adjustment plate 211 in the depth adjustment liquid inlet mechanism can be slightly adjusted after the precise interface is determined by the optical interface detector 207, so that the lower end of the vertical suction pipe 213 is located above the interface, so that the interface will not be disturbed during the suction process, and the organic phase can be quickly discharged.

[0024] As a preferred embodiment of the present invention, Fig.13 , 14As shown, the convection extraction device 400 includes an upper movable frame 405, a lower fixed frame 402, two second vertical driving members 407 and a plurality of convection regulating cylinders 401, the upper and lower ends of each convection regulating cylinder 401 are respectively connected to the upper movable frame 405 and the lower fixed frame 402, and the lower part of the convection regulating cylinder 401 is transmission-connected to 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, and 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. The lower connecting ears 404 are symmetrically constructed on both sides of the middle of the lower fixed frame 402, and the 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 correspondingly up and down, and the corresponding lower connecting ears 404 and upper connecting ears 406 at both ends of each second vertical driving member 407 are connected, and the second vertical driving member 407 is preferably a vertical cylinder. In this embodiment, the upper end of each convection regulating cylinder 401 is connected to the first liquid pipe 408, and the lower end of the convection regulating cylinder 401 is respectively connected to 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 connected. The first liquid pipe 408 is used to transport the first liquid phase into each convection regulating cylinder 401, and the second liquid pipe 409 is used to transport the other liquid phase into each convection regulating cylinder 401, and the two liquid phases are convectively mixed in each convection regulating 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 convection regulating cylinder 401 of this embodiment adopts a structure of upper and lower split bodies. By controlling the action of the second vertical driving member 407, the volume of the mixing chamber of the convection regulating 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 can drive the lower part of each convection regulating cylinder 401 to rotate, so that the two liquid phases in the mixing chamber are disturbed and convected at the same time, thereby improving the mixing efficiency and promoting Co 2+ Rapid transfer.

[0025] As a preferred embodiment of the present invention, Figure 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 mounted on the lower end of the outer sleeve 40115, and the connection cover 40123 closes the lower end of the outer sleeve 40115. A fixing sleeve 40124 is configured at the center of the connection cover 40123, and 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, and a vertical pipe 40125 is rotatably connected to the lower end of the lower liquid pipe 40114, and the vertical pipe 40125 is communicated with the third liquid pipe 410, and a seventh control valve 40126 is installed on the vertical pipe 40125. In this embodiment, a plurality of connecting holes 40118 are opened on the outer sleeve 40115, a transfer sleeve 40119 is mounted on the outer sleeve 40115, the outer sleeve 40115 is rotatably connected to the transfer sleeve 40119, a conducting cavity 40120 is formed in the transfer sleeve 40119, a transfer tube 40121 is connected to the transfer sleeve 40119, the transfer tube 40121 is connected to the second liquid pipe 409, and a sixth control valve 40122 is installed on the transfer tube 40121. In this embodiment, a first channel 40116 is formed in the lower liquid pipe 40114, and a second channel 40117 is formed in the outer sleeve 40115 and outside the lower liquid pipe 40114. The first channel 40116 is directly connected to the mixing chamber, and the second channel 40117 is indirectly connected to the mixing chamber through the second jet chamber 40112 and the second jet hole 40113. Another liquid phase enters the conduction chamber 40120 of each adapter sleeve 40119 through the second liquid pipe 409, and then enters the second jet chamber 40112 through the second channel 40117, and then jets into the mixing chamber in an outwardly divergent form, so that the two dispersed and jet liquid phases intersect with each other, thereby promoting the adequacy of mixing. When the mixing is completed, the mixed liquid is discharged into the third liquid pipe 410 through the lower liquid pipe 40114 and finally discharged.

[0026] As a preferred embodiment of the present invention, Fig.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.

[0027] The present invention also discloses a method for separating cobalt and magnesium using the above-mentioned cobalt-nickel hydrometallurgical system, comprising the following steps: 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; 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; 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; 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; Step 5. After mixing, discharge to the first liquid collecting tank 300 for stratification, and discharge the raffinate into the first collecting kettle; Step 6: The organic phase after extraction is supplied to the washing device 500, and the organic phase is washed with dilute acid to remove the entrained Mg. 2+ Impurities; Step 7. The washed product is passed into the convection stripping device 600, and a strong acid is supplied to the convection stripping device 600. After sufficient mixing, the product is transferred to the second liquid collecting tank 700, and gravity stratified in the second liquid collecting tank 700 to separate the Co 2+ The organic phase is extracted into the aqueous phase, and the raffinate is discharged into the second collecting kettle to obtain a high-purity cobalt solution.

[0028] In this embodiment, di(2-ethylhexyl)phosphoric acid is commonly used as the extractant. During the extraction, the pH value is controlled within the range of 4-6. The pH value is generally adjusted by sodium hydroxide or sodium carbonate. Cobalt ions are extracted first, while magnesium ions remain in the aqueous phase. During washing and back extraction, the organic phase is loaded with dilution and then back extracted with hydrochloric acid or sulfuric acid to obtain a high-purity cobalt solution. In each process involving the mixing of an organic phase and an aqueous phase, the ratio of the organic phase to the aqueous phase is 1:1-1:3.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in 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 clarifying device, a countercurrent extraction device, a first liquid collecting tank, a washing device, a countercurrent stripping device and a second liquid collecting 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 collecting kettle, and the countercurrent stripping device is connected to a second collecting kettle.

2. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 1, characterized in that: 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, characterized in that: 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 is characterized in that: 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, characterized in that: The depth-adjustable clarification device includes a clarification tank and a depth-adjustable liquid inlet mechanism. 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 a side wall on one side of the clarification tank, and a transparent observation mirror is installed on the other side wall of the clarification tank. An optical interface detector is installed at the transparent observation mirror.

6. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 5, characterized in that: 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.

7. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 1, characterized in that: 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.

8. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 7, 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.

9. The cobalt-magnesium separation system for cobalt-nickel hydrometallurgy according to claim 8, 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.

10. A method for separating cobalt and magnesium using the cobalt-nickel hydrometallurgical system according to any one of claims 1 to 9, characterized in that: The steps include: 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; 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; Step 3. After the mixing is completed, the mixed liquid is supplied to a depth-adjustable clarification device, so that the mixed liquid is gravity-stratified in the depth-adjustable clarification device, and the Co 2+ The organic phase and the aqueous phase are separated; Step 4. 2+ The organic phase is extracted from the depth-adjusting clarification device and then supplied to the countercurrent extraction device, and the aqueous phase is simultaneously supplied 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. The organic phase after extraction is supplied to a washing device, and diluted acid is used to wash the organic phase to remove the entrained Mg 2+ Impurities; Step 7. The washed product is passed into a countercurrent stripping device, and a strong acid is supplied to the countercurrent stripping device. After sufficient mixing, the product is transferred to a second liquid collecting tank, and gravity stratified in the second liquid collecting tank to separate the Co 2+ The organic phase is extracted into the aqueous phase, and the raffinate is discharged into the second collecting kettle to obtain a high-purity cobalt solution.

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