Precipitant injection device and MHP preparation system

Abstract

The invention discloses a precipitant injection device and an MHP preparation system.The injection device comprises an alkali liquor storage tank, a magnesium-containing solution storage tank and a mixed injection mechanism, and the alkali liquor storage tank and the magnesium-containing solution storage tank are arranged beside a first-section nickel and cobalt precipitation reaction tank; and the mixed injection mechanism is arranged at the top of the first-section nickel-cobalt precipitation reaction tank, is connected with the alkali liquor storage tank, the magnesium-containing solution storage tank and the first-section nickel-cobalt precipitation reaction tank through pipelines, and is used for receiving alkali liquor in the alkali liquor storage tank and a magnesium-containing solution in the magnesium-containing solution storage tank, mixing the alkali liquor and the magnesium-containing solution and injecting the mixed liquor into the first-section nickel-cobalt precipitation reaction tank. According to the method, the alkali liquor and the magnesium-containing solution are mixed and then fed into the first-section nickel-cobalt precipitation reaction tank, magnesium hydroxide precipitates can be formed after the alkali liquor and the magnesium-containing solution are mixed, the magnesium hydroxide precipitates enter the first-section nickel-cobalt precipitation reaction tank and can be rapidly dissolved, and the effect of alkali liquor slow release is achieved; and the situation that local alkali is excessive in the first-section nickel and cobalt precipitation reaction tank is avoided, so that the precipitation effect in the first-section nickel and cobalt precipitation reaction tank is guaranteed, and the quality of an MHP product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydrometallurgy, and in particular to a precipitant injection device and an MHP preparation system. Background Art

[0002] Laterite nickel ore is a loose clay-like multi-mineral aggregate formed by long-term weathering, leaching, impregnation, alteration and other geological processes of nickel-bearing olivine bedrock in tropical or subtropical regions, accompanied by metal components such as nickel, cobalt, chromium, magnesium and aluminum.

[0003] At present, in the hydrometallurgical process of laterite nickel ore, sodium hydroxide solution is often used as a nickel-cobalt precipitant. The sodium hydroxide solution is gradually pumped into the nickel-cobalt precipitation tank to gradually increase the pH value in the nickel-cobalt precipitation tank. The precipitation pH difference of different metal ions is used to realize the precipitation and separation of nickel and cobalt ions, so as to achieve the purpose of nickel and cobalt purification.

[0004] However, the addition of sodium hydroxide solution will cause local over-alkalinity in a section of the nickel-cobalt precipitation reaction tank, which results in the crystallized precipitated MHP product containing more impurities, and the quality of the MHP product finally prepared is not high. Summary of the invention

[0005] The purpose of the present application is to overcome the above technical deficiencies, propose a precipitant injection device and an MHP preparation system, and solve the technical problem of local over-alkali in the prior art.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions:

[0007] The present application provides a precipitant injection device, comprising:

[0008] Lye storage tank;

[0009] Storage tanks containing magnesium solutions; and,

[0010] The mixing and injection mechanism is arranged at the top of a nickel-cobalt precipitation reaction tank and is connected to the alkali solution storage tank, the magnesium-containing solution storage tank and a nickel-cobalt precipitation reaction tank. It is used to receive the alkali solution in the alkali solution storage tank and the magnesium-containing solution in the magnesium-containing solution storage tank, and mix and inject them into the nickel-cobalt precipitation reaction tank within a set time.

[0011] In some embodiments, a plurality of the mixing injection mechanisms are included, and the plurality of the mixing injection mechanisms are evenly arranged circumferentially on the top of a section of the nickel-cobalt precipitation reaction tank, and the top of the section of the nickel-cobalt precipitation reaction tank is provided with a plurality of feed ports corresponding to the mixing injection mechanisms one by one along the circumferential direction.

[0012] In some embodiments, the set time is 3 to 5 minutes.

[0013] In some embodiments, the mixing and injection mechanism includes a static mixer, an alkali solution input pump, and a magnesium-containing solution input pump. The input end of the alkali solution input pump is connected to the alkali solution storage tank pipeline, the input end of the magnesium-containing solution input pump is connected to the magnesium-containing solution storage tank pipeline, the output end of the alkali solution input pump and the output end of the magnesium-containing solution input pump are connected to the input port pipeline of the static mixer, and the output port of the static mixer is connected to the pipeline of the nickel-cobalt precipitation reaction tank.

[0014] In some embodiments, the mixing injection mechanism also includes a controller and a drain valve, wherein the drain valve is arranged at the output port of the static mixer, and the controller is electrically connected to the alkali solution input pump, the magnesium-containing solution input pump and the drain valve, and is used to control the opening and closing of the alkali solution input pump, the magnesium-containing solution input pump and the drain valve.

[0015] In some embodiments, the time for the alkaline solution and the magnesium-containing solution to flow from the input port of the static mixer to the first stage of nickel-cobalt precipitation reaction tank does not exceed 5 minutes.

[0016] In some embodiments, it also includes a section of nickel-cobalt underflow storage tank, the liquid inlet end of which is connected to the underflow discharge end of a section of nickel-cobalt thickener, and the liquid outlet end of which is connected to the liquid inlet end of the mixing injection mechanism.

[0017] In some embodiments, the mixed injection mechanism also includes multiple liquid level gauges and multiple control pumps, and the multiple liquid level gauges and multiple control pumps are arranged in a one-to-one correspondence, and each of the liquid level gauges and each control pump is arranged in conjunction with one of the alkali solution storage tank, the magnesium-containing solution storage tank, and a section of nickel-cobalt underflow storage tank; the liquid level gauge is used to detect the liquid level in the alkali solution storage tank or the magnesium-containing solution storage tank or the section of nickel-cobalt underflow storage tank, and the controller is used to control the opening and closing of the control pump according to the liquid level signal of the liquid level gauge.

[0018] The present application also provides an MHP preparation system, comprising the injection device described in any one of the above items, a one-stage nickel-cobalt precipitation reaction tank, a one-stage nickel-cobalt precipitation thickener and a filter press, wherein the injection device is connected to the one-stage nickel-cobalt precipitation reaction tank, the discharge end of the one-stage nickel-cobalt precipitation reaction tank is connected to the feed end of the one-stage nickel-cobalt precipitation thickener, and the underflow discharge end of the one-stage nickel-cobalt precipitation thickener is connected to the filter press.

[0019] In some embodiments, a two-stage nickel-cobalt precipitation reaction tank is further included, and the overflow discharge end of the one-stage nickel-cobalt precipitation thickener is connected to the feed end of the two-stage nickel-cobalt precipitation reaction tank.

[0020] Compared with the prior art, the precipitant injection device provided in the present application comprises an alkali solution storage tank, a magnesium-containing solution storage tank and a mixing injection mechanism, wherein the alkali solution storage tank and the magnesium-containing solution storage tank are arranged next to a section of nickel-cobalt precipitation reaction tank, and the mixing injection mechanism is arranged at the top of the section of nickel-cobalt precipitation reaction tank and is connected to the alkali solution storage tank, the magnesium-containing solution storage tank and a section of nickel-cobalt precipitation reaction tank pipeline, receives the sodium hydroxide solution in the alkali solution storage tank and the magnesium-containing solution in the magnesium-containing solution storage tank, and injects them into the section of nickel-cobalt precipitation reaction tank after mixing. In the present application, a sodium hydroxide solution is first mixed with a magnesium-containing solution and then fed into a nickel-cobalt precipitation reaction tank. After the sodium hydroxide solution and the magnesium-containing solution are mixed, a magnesium hydroxide precipitate is formed. However, the reaction time of magnesium and sodium hydroxide is slow, and the formed crystals are small. When injected into the nickel-cobalt precipitation reaction tank, since the nickel-cobalt precipitation reaction tank contains a large amount of solution, the magnesium hydroxide precipitate can be quickly dissolved, which has the effect of slow release of alkali solution, avoiding the situation of local over-alkali in the nickel-cobalt precipitation reaction tank, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation reaction tank and improving the quality of MHP products.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the preferred embodiments of the present application are described in detail as follows in conjunction with the accompanying drawings. The specific implementation methods of the present application are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a precipitant injection device provided in the present application;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of the mixed injection mechanism;

[0024] Figure 3 It is a module schematic diagram of a MHP preparation system provided in this application.

[0025] Description of reference numerals:

[0026] 1-alkaline solution storage tank, 2-magnesium-containing solution storage tank, 3-mixing injection mechanism, 31-static mixer, 32-alkaline solution input pump, 33-magnesium-containing solution input pump, 34-drain valve, 4-first-stage nickel-cobalt precipitation underflow storage tank, 100-injection device, 200-first-stage nickel-cobalt precipitation reaction tank, 300-filter press, 400-second-stage nickel-cobalt precipitation reaction tank. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] See also Figure 1 , Figure 2 The present application provides a precipitant injection device 100, comprising: an alkali solution storage tank 1, a magnesium-containing solution storage tank 2 and a mixing injection mechanism 3, wherein the alkali solution storage tank 1 and the magnesium-containing solution storage tank 2 are arranged next to a section of nickel-cobalt precipitation reaction tank 200, and the mixing injection mechanism 3 is arranged at the top of the section of nickel-cobalt precipitation reaction tank and is connected to the alkali solution storage tank 1, the magnesium-containing solution storage tank 2 and the section of nickel-cobalt precipitation reaction tank 200 through pipelines, receives the sodium hydroxide solution in the alkali solution storage tank 1 and the magnesium-containing solution in the magnesium-containing solution storage tank 2, and injects them into the section of nickel-cobalt precipitation reaction tank 200 after mixing.

[0029] In the present application, a sodium hydroxide solution is first mixed with a magnesium-containing solution and then fed into a nickel-cobalt precipitation reaction tank. After the sodium hydroxide solution and the magnesium-containing solution are mixed, a magnesium hydroxide precipitate is formed. However, the reaction time of magnesium and sodium hydroxide is short, and the formed crystals are small. When injected into a nickel-cobalt precipitation reaction tank 200, since a large amount of solution is contained in the nickel-cobalt precipitation reaction tank 200, the magnesium hydroxide precipitate can be quickly dissolved, which has the effect of slow release of alkali solution, ensuring that there will be no local over-alkali in the nickel-cobalt precipitation reaction tank, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation reaction tank and improving the quality of MHP products.

[0030] In this embodiment, the alkali solution storage tank 1 stores sodium hydroxide solution.

[0031] In this embodiment, the magnesium-containing solution storage tank 2 stores a magnesium-containing solution.

[0032] In some feasible embodiments, the magnesium-containing solution storage tank 2 is connected to a manganese removal device to receive the manganese-removed solution. The manganese-removed solution is poured into the magnesium-containing solution storage tank 2 as the magnesium-containing solution. The advantage is that the problem of dilution with industrial water is avoided, thus saving water resources.

[0033] In this embodiment, a plurality of the mixing injection mechanisms 3 are included, and the plurality of the mixing injection mechanisms 3 are evenly arranged circumferentially on the top of a section of nickel-cobalt precipitation reaction tank 200, and a section of nickel-cobalt precipitation reaction tank 200 is provided with a plurality of feed ports corresponding to the mixing injection mechanisms 3 along the circumference. The advantage of providing a plurality of the mixing injection mechanisms 3 is that the mixed solution of sodium hydroxide and magnesium-containing solution can be injected into a section of nickel-cobalt precipitation reaction tank 200 at multiple points, which can improve input uniformity and reaction rate on the one hand, and avoid single-point injection, which makes it difficult for magnesium hydroxide particles to dissolve quickly, and then be coated in nickel-cobalt hydroxide particles.

[0034] In this embodiment, the mixing injection mechanism 3 includes a static mixer 31, an alkali solution input pump 32, and a magnesium-containing solution input pump 33. The input end of the alkali solution input pump 32 is connected to the alkali solution storage tank 1 by a pipeline, and the input end of the magnesium-containing solution input pump 33 is connected to the magnesium-containing solution storage tank 2 by a pipeline. The output end of the alkali solution input pump 32 and the output end of the magnesium-containing solution input pump 33 are connected to the input port pipeline of the static mixer 31, and the output port of the static mixer 31 is connected to a nickel-cobalt precipitation reaction tank 200 by a pipeline. After the sodium hydroxide solution and the magnesium-containing solution are input into the static mixer 31 and mixed, they are sent to a nickel-cobalt precipitation reaction tank 200.

[0035] In this embodiment, the mixing injection mechanism 3 also includes a controller and a drain valve 34, and the drain valve 34 is arranged at the output port of the static mixer 31. The controller is electrically connected to the alkali solution input pump 32, the magnesium-containing solution input pump 33 and the drain valve 33, and is used to control the opening and closing of the alkali solution input pump 32, the magnesium-containing solution input pump 33 and the drain valve 34.

[0036] In this embodiment, the mixed injection mechanism 3 also includes multiple liquid level gauges and multiple control pumps, and the multiple liquid level gauges and multiple control pumps are arranged in a one-to-one correspondence, and each of the liquid level gauges and each control pump is arranged in cooperation with one of the alkali solution storage tank 1, the magnesium-containing solution storage tank 2, and a section of nickel-cobalt underflow storage tank 4; the liquid level gauge is used to detect the liquid level in the alkali solution storage tank 1 or the magnesium-containing solution storage tank 2 or a section of nickel-cobalt underflow storage tank, and the controller is electrically connected to the liquid level gauge and the control pump, and is used to control the opening and closing of the control pump according to the liquid level signal of the liquid level gauge, and when the liquid level signal detected by the liquid level gauge is less than the first threshold value, the corresponding control pump is controlled to start, and when the liquid level signal detected by the liquid level gauge is greater than the second threshold value, the corresponding control pump is controlled to stop; wherein, the second threshold value is greater than the first threshold value.

[0037] In this embodiment, the controller controls the drain valve 34 to open and controls the flow rate of the alkali solution input pump 32 and the magnesium-containing solution input pump 33, thereby controlling the time for the alkali solution and the magnesium-containing solution to flow from the input port of the static mixer to the first section of the nickel-cobalt precipitation reaction tank 200 to not exceed 5 minutes. If the reaction time of sodium hydroxide and magnesium ion solution is too long, the formed magnesium hydroxide precipitate will agglomerate. As the reaction time increases, the crystals will gradually increase. When the mixed solution is injected into a nickel-cobalt precipitation reaction tank 200, the magnesium hydroxide precipitate with too large a particle size is difficult to dissolve quickly, so the precipitate is easily wrapped by the nickel-cobalt precipitation; and when the sodium hydroxide solution reacts with the magnesium-containing solution for a short time (3-5 minutes) and then is injected into a nickel-cobalt precipitation reaction tank 200, since the reaction time of magnesium and sodium hydroxide is short, the particle size of the magnesium hydroxide crystals formed is smaller. When injected into a nickel-cobalt precipitation reaction tank, since the nickel-cobalt precipitation reaction tank 200 contains a large amount of solution, the magnesium hydroxide precipitate can be quickly dissolved, so it will not be coated in the nickel-cobalt hydroxide precipitate, and the magnesium will not be wrapped. Therefore, in actual use, the controller controls the opening and closing of the alkali solution input pump 32, the magnesium-containing solution input pump 33, and the drain valve 34, and controls the flow rates of the sodium hydroxide solution and the magnesium-containing solution to control the reaction time of the sodium hydroxide and magnesium ion solution in the static mixer, thereby avoiding the formation of magnesium hydroxide precipitates with too large particle size and ensuring the quality of the MHP product.

[0038] The present application also includes a section of nickel-cobalt underflow storage tank 4, the liquid inlet end of the section of nickel-cobalt underflow storage tank 4 is connected to the bottom of a section of nickel-cobalt reaction tank 200, and the liquid outlet end of the section of nickel-cobalt underflow storage tank 4 is connected to the top of a section of nickel-cobalt reaction tank 200. The purpose is to add the nickel-cobalt hydroxide crystals in the section of nickel-cobalt underflow as seeds into the section of nickel-cobalt reaction tank 200 to promote better crystallization and growth of nickel and cobalt in the section of nickel-cobalt reaction tank 200.

[0039] See also Figure 3The present application also provides a MHP preparation system, including the injection device 100, a nickel-cobalt precipitation reaction tank 200, a nickel-cobalt precipitation thickener and a filter press 300, wherein the injection device 100 is connected to the nickel-cobalt precipitation reaction tank 200, the discharge end of the nickel-cobalt precipitation reaction tank 200 is connected to the feed end of the nickel-cobalt precipitation thickener, and the underflow discharge end of the nickel-cobalt precipitation thickener is connected to the filter press 300. After the precipitant is injected, the nickel and cobalt in the slurry in the nickel-cobalt precipitation reaction tank 200 will generate precipitation, and then the slurry containing the precipitation is injected into the nickel-cobalt precipitation thickener, and the solid-liquid separation is carried out after the flocculant is added, and the underflow enters the filter press to form the MHP product. It is easy to understand that the nickel-cobalt precipitation thickener in this embodiment is not shown, but it does not affect the understanding of those skilled in the art, and the connection method of the nickel-cobalt precipitation thickener with the nickel-cobalt precipitation reaction tank 200 and the filter press 300 belongs to the conventional method in the field, and this embodiment does not describe it in detail.

[0040] In this embodiment, the MHP preparation system also includes a two-stage nickel-cobalt precipitation reaction tank 400, the overflow discharge end of the first-stage nickel-cobalt precipitation thickener is connected to the second-stage nickel-cobalt precipitation reaction tank 400, and the overflow of the first-stage nickel-cobalt precipitation thickener enters the second-stage nickel-cobalt precipitation tank 400 for treatment.

[0041] In order to better understand the present application, the technical solution of the present application is described in detail below with reference to the accompanying drawings:

[0042] The controller controls the alkali solution input pump 32, the magnesium-containing solution input pump 32 and the drain valve 33 to be opened synchronously. After the sodium hydroxide solution and the magnesium-containing solution are pumped into the static mixer 31 for mixing, the mixed solution flows into the first-stage nickel-cobalt precipitation reaction tank 200, and nickel and cobalt are precipitated. In addition, the first-stage nickel-cobalt precipitation underflow can be introduced into the first-stage nickel-cobalt precipitation reaction tank 200 through the first-stage nickel-cobalt precipitation underflow storage tank 4 as a crystal seed to promote better crystallization and growth of the nickel and cobalt in the first-stage nickel-cobalt precipitation reaction tank 200. After the reaction in the first-stage nickel-cobalt precipitation reaction tank 200 is completed, it is input into a first-stage nickel-cobalt precipitation thickener for precipitation and thickening, and solid-liquid separation. The time for the alkali solution and the magnesium-containing solution to flow from the input port of the static mixer to the first-stage nickel-cobalt precipitation reaction tank does not exceed 5 minutes. The underflow of the first-stage nickel-cobalt precipitation thickener enters the filter press for filtration to form an MHP product, and the overflow of the first-stage nickel-cobalt precipitation thickener enters the second-stage nickel-cobalt precipitation tank 400 for treatment.

[0043] Beneficial effects of the present application: The precipitant injection device provided in the present application comprises an alkali solution storage tank, a magnesium-containing solution storage tank and a mixing injection mechanism, wherein the alkali solution storage tank and the magnesium-containing solution storage tank are arranged next to a section of nickel-cobalt precipitation reaction tank, and the mixing injection mechanism is arranged at the top of a section of nickel-cobalt precipitation reaction tank and is connected to the alkali solution storage tank, the magnesium-containing solution storage tank and a section of nickel-cobalt precipitation reaction tank pipeline, and is used to receive the sodium hydroxide solution in the alkali solution storage tank and the magnesium-containing solution in the magnesium-containing solution storage tank, and inject them into a section of nickel-cobalt precipitation reaction tank after mixing. In the present application, a sodium hydroxide solution is first mixed with a magnesium-containing solution and then fed into a nickel-cobalt precipitation reaction tank. After the sodium hydroxide solution and the magnesium-containing solution are mixed, a magnesium hydroxide precipitate is formed. However, the reaction time of magnesium and sodium hydroxide is slow, and the formed crystals are small. When injected into the nickel-cobalt precipitation reaction tank, since the nickel-cobalt precipitation reaction tank contains a large amount of solution, the magnesium hydroxide precipitate can be quickly dissolved, which has the effect of slow release of alkali solution, avoiding the situation of local over-alkali in the nickel-cobalt precipitation reaction tank, thereby ensuring the nickel-cobalt precipitation effect in the nickel-cobalt precipitation reaction tank and improving the quality of MHP products.

[0044] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A precipitant injection device, used for injecting a precipitant into a nickel-cobalt precipitation reaction tank, characterized in that: It includes: Lye storage tank; Storage tanks containing magnesium solutions; as well as, The mixing and injection mechanism is arranged at the top of a nickel-cobalt precipitation reaction tank and is connected to the alkali solution storage tank, the magnesium-containing solution storage tank and a nickel-cobalt precipitation reaction tank. It is used to receive the alkali solution in the alkali solution storage tank and the magnesium-containing solution in the magnesium-containing solution storage tank, and mix and inject them into the nickel-cobalt precipitation reaction tank within a set time.

2. The precipitant injection device according to claim 1, characterized in that: It comprises a plurality of the mixing injection mechanisms, which are evenly arranged circumferentially on the top of a section of nickel-cobalt precipitation reaction tank, and the top of the section of nickel-cobalt precipitation reaction tank is provided with a plurality of feed ports corresponding to the mixing injection mechanisms one by one along the circumferential direction.

3. The precipitant injection device according to claim 1, characterized in that: The setting time is 3 to 5 minutes.

4. The precipitant injection device according to claim 2, characterized in that: The mixing and injection mechanism includes a static mixer, an alkali solution input pump, and a magnesium-containing solution input pump. The input end of the alkali solution input pump is connected to the alkali solution storage tank pipeline, the input end of the magnesium-containing solution input pump is connected to the magnesium-containing solution storage tank pipeline, the output end of the alkali solution input pump and the output end of the magnesium-containing solution input pump are connected to the input port pipeline of the static mixer, and the output port of the static mixer is connected to the pipeline of the first section of nickel-cobalt precipitation reaction tank.

5. The precipitant injection device according to claim 4, characterized in that: The mixing injection mechanism also includes a controller and a drain valve, which is arranged at the output port of the static mixer. The controller is electrically connected to the alkali solution input pump, the magnesium-containing solution input pump and the drain valve, and is used to control the opening and closing of the alkali solution input pump, the magnesium-containing solution input pump and the drain valve.

6. The precipitant injection device according to claim 5, characterized in that: The time for the alkali solution and the magnesium-containing solution to flow from the input port of the static mixer to the first stage of nickel-cobalt precipitation reaction tank does not exceed 5 minutes.

7. The precipitant injection device according to claim 1, characterized in that: It also includes a section of nickel-cobalt underflow storage tank, the liquid inlet end of which is connected to the underflow discharge end of a section of nickel-cobalt thickener, and the liquid outlet end of which is connected to the liquid inlet end of the mixing injection mechanism.

8. The precipitant injection device according to claim 5, characterized in that: The mixed injection mechanism also includes multiple liquid level gauges and multiple control pumps, which are arranged in a one-to-one correspondence, and each of the liquid level gauges and each control pump is arranged in conjunction with one of the alkali solution storage tank, the magnesium-containing solution storage tank, and a section of nickel-cobalt underflow storage tank; the liquid level gauge is used to detect the liquid level in the alkali solution storage tank, the magnesium-containing solution storage tank, or the section of nickel-cobalt underflow storage tank, and the controller is used to control the opening and closing of the control pump according to the liquid level signal of the liquid level gauge.

9. A MHP preparation system, characterized in that: It comprises an injection device as described in any one of claims 1 to 8, a nickel-cobalt precipitation reaction tank, a nickel-cobalt precipitation thickener and a filter press, the injection device is connected to the nickel-cobalt precipitation reaction tank, the discharge end of the nickel-cobalt precipitation reaction tank is connected to the feed end of the nickel-cobalt precipitation thickener, and the underflow discharge end of the nickel-cobalt precipitation thickener is connected to the filter press.

10. The MHP preparation system according to claim 9, characterized in that: It also includes a two-stage nickel-cobalt precipitation reaction tank, and the overflow discharge end of the one-stage nickel-cobalt precipitation thickener is connected to the feed end of the two-stage nickel-cobalt precipitation reaction tank.

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