Precipitant injection device and MHP preparation system

Abstract

The present application discloses a precipitant injection device and an MHP preparation system. The injection device comprises an alkali solution storage tank, a magnesium-containing solution storage tank, and mixing and injection mechanisms, wherein the alkali solution storage tank and the magnesium-containing solution storage tank are arranged beside a first-stage nickel and cobalt precipitation reaction tank; and the mixing and injection mechanisms are arranged at the top of the first-stage nickel and cobalt precipitation reaction tank, are connected to the alkali solution storage tank, the magnesium-containing solution storage tank, and the first-stage nickel and cobalt precipitation reaction tank via pipes, and are used for receiving an alkali solution from the alkali solution storage tank and a magnesium-containing solution from the magnesium-containing solution storage tank, mixing the alkali solution with the magnesium-containing solution, and then injecting the mixture into the first-stage nickel and cobalt precipitation reaction tank. In the present application, the alkali solution is first mixed with the magnesium-containing solution and then fed into the first-stage nickel and cobalt precipitation reaction tank; and after the alkali solution is mixed with the magnesium-containing solution, a magnesium hydroxide precipitate is formed, and when the magnesium hydroxide precipitate enters the first-stage nickel and cobalt precipitation reaction tank, the magnesium hydroxide precipitate can be quickly dissolved, thereby achieving an effect of slow release of the alkali solution, avoiding local excessive alkalinity inside the first-stage nickel and cobalt precipitation reaction tank, thus ensuring the precipitation effect inside the first-stage nickel and cobalt precipitation reaction tank and improving the quality of an MHP product.

Description

Injection device of precipitant and MHP preparation system TECHNICAL FIELD

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

[0002] Laterite nickel ore is a loose clay-like multi-mineral aggregate formed by long-term weathering, leaching, impregnation and alteration of nickel-bearing olivine-based rocks 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 and separation of nickel and cobalt ions are realized by utilizing the pH difference of different metal ions, so as to achieve the purpose of nickel and cobalt purification.

[0004] However, the addition of sodium hydroxide solution can cause local over-alkalization in the first nickel-cobalt precipitation reaction tank, which results in a large amount of impurities in the crystallized and precipitated MHP product, and the quality of the finally prepared MHP product is not high.

[0005] SUMMARY

[0006] The purpose of the present application is to overcome the above technical deficiencies and provide an injection device of precipitant and an MHP preparation system to solve the technical problem of local over-alkalization in the prior art.

[0007] To achieve the above technical purpose, the following technical scheme is adopted in the present application:

[0008] The present application provides an injection device of precipitant, comprising:

[0009] An alkali solution storage tank;

[0010] A magnesium-containing solution storage tank; and

[0011] A mixing injection mechanism arranged at the top of the first nickel-cobalt precipitation reaction tank and connected with the alkali solution storage tank, the magnesium-containing solution storage tank and the first nickel-cobalt precipitation reaction tank, which 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 into the first nickel-cobalt precipitation reaction tank within a set time.

[0012] In some embodiments, a plurality of mixing injection mechanisms are arranged uniformly in a circumferential direction at the top of the first nickel-cobalt precipitation reaction tank, and the top of the first nickel-cobalt precipitation reaction tank is provided with a plurality of feed ports corresponding to the mixing injection mechanisms.

[0013] In some embodiments, the setting time is 3-5 minutes.

[0014] In some embodiments, the mixing injection mechanism comprises a static mixer, a lye input pump, a magnesium-containing solution input pump, an input end of the lye input pump being connected with the lye storage tank pipeline, an input end of the magnesium-containing solution input pump being connected with the magnesium-containing solution storage tank pipeline, an output end of the lye input pump and an output end of the magnesium-containing solution input pump being connected with an input port of the static mixer, and an output port of the static mixer being connected with the one-stage nickel-cobalt precipitation reaction tank pipeline.

[0015] In some embodiments, the mixing injection mechanism further comprises a controller and a liquid discharge valve, the liquid discharge valve being arranged at the output port of the static mixer, the controller being electrically connected with the lye input pump, the magnesium-containing solution input pump and the liquid discharge valve, and being used for controlling the opening and closing of the lye input pump, the magnesium-containing solution input pump and the liquid discharge valve.

[0016] In some embodiments, the time for the lye and the magnesium-containing solution flowing from the input port of the static mixer into the one-stage nickel-cobalt precipitation reaction tank is not more than 5 minutes.

[0017] In some embodiments, the system further comprises a one-stage nickel-cobalt precipitation underflow storage tank, a liquid inlet end of the one-stage nickel-cobalt precipitation underflow storage tank being communicated with a bottom flow outlet end of the one-stage nickel-cobalt thickener, and a liquid outlet end of the one-stage nickel-cobalt precipitation underflow storage tank being communicated with a liquid inlet end of the mixing injection mechanism.

[0018] In some embodiments, the mixing injection mechanism further comprises a plurality of liquid level meters and a plurality of regulating pumps, the plurality of liquid level meters and the plurality of regulating pumps being arranged in one-to-one correspondence, and each of the liquid level meters and the regulating pumps being arranged in cooperation with one of the lye storage tank, the magnesium-containing solution storage tank and the one-stage nickel-cobalt precipitation underflow storage tank; the liquid level meter is used for detecting the liquid level in the lye storage tank or the magnesium-containing solution storage tank or the one-stage nickel-cobalt precipitation underflow storage tank, and the controller is used for controlling the opening and closing of the regulating pump according to the liquid level signal of the liquid level meter.

[0019] The application further provides an MHP preparation system, comprising the injection device, the one-stage nickel-cobalt precipitation reaction tank, the one-stage nickel-cobalt thickener and the filter press according to any one of the above-mentioned embodiments, the injection device being communicated with the one-stage nickel-cobalt precipitation reaction tank, a material outlet end of the one-stage nickel-cobalt precipitation reaction tank being communicated with a material inlet end of the one-stage nickel-cobalt thickener, and a bottom flow material outlet end of the one-stage nickel-cobalt thickener being communicated with the filter press.

[0020] In some embodiments, the system further comprises a two-stage nickel-cobalt precipitation reaction tank, an overflow material outlet end of the one-stage nickel-cobalt thickener being communicated with a material inlet end of the two-stage nickel-cobalt precipitation reaction tank.

[0021] Compared with the prior art, the injection device of the precipitant provided by the application comprises a lye storage tank, a magnesium-containing solution storage tank and a mixing injection mechanism, the lye storage tank and the magnesium-containing solution storage tank are arranged beside a first-stage nickel-cobalt precipitation reaction tank, the mixing injection mechanism is arranged at the top of the first-stage nickel-cobalt precipitation reaction tank and is connected with the lye storage tank, the magnesium-containing solution storage tank and the pipeline of the first-stage nickel-cobalt precipitation reaction tank, receives sodium hydroxide solution in the lye storage tank and magnesium-containing solution in the magnesium-containing solution storage tank, and injects the mixed solution into the first-stage nickel-cobalt precipitation reaction tank. In the application, the sodium hydroxide solution is mixed with the magnesium-containing solution before being sent into the first-stage nickel-cobalt precipitation reaction tank. After the sodium hydroxide solution is mixed with the magnesium-containing solution, magnesium hydroxide precipitate is formed. However, the reaction between magnesium and sodium hydroxide is slow, and the formed crystal is small. When the mixed solution is injected into the first-stage nickel-cobalt precipitation reaction tank, the magnesium hydroxide precipitate can be quickly dissolved due to the large amount of solution in the first-stage nickel-cobalt precipitation reaction tank, thereby achieving the effect of slow release of lye, avoiding the occurrence of local overalkalization in the first-stage nickel-cobalt precipitation reaction tank, and ensuring the nickel-cobalt precipitation effect in the first-stage nickel-cobalt precipitation reaction tank and improving the quality of MHP products.

[0022] The above description is only a summary of the technical scheme of the application. In order to make the technical means of the application more clearly understood and implemented according to the content of the description, the preferred embodiments of the application are described in detail below with reference to the accompanying drawings. The specific embodiments of the application are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a structural schematic view of the injection device of the precipitant provided by the application;

[0024] Fig. 2 is a structural schematic view of the mixing injection mechanism in Fig. 1;

[0025] Fig. 3 is a module schematic view of an MHP preparation system provided by the application.

[0026] Explanation of reference signs:

[0027] 1-lye storage tank, 2-magnesium-containing solution storage tank, 3-mixing injection mechanism, 31-static mixer, 32-lye input pump, 33-magnesium-containing solution input pump, 34-drain valve, 4-first-stage nickel-cobalt precipitation bottom flow 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

[0028] In order to make the purpose, technical scheme and advantages of the application more clearly understood, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0029] Referring to FIG. 1, FIG. 2, the application provides a precipitant injection device 100, comprising: a lye storage tank 1, a magnesium-containing solution storage tank 2 and a mixed injection mechanism 3, the lye storage tank 1 and the magnesium-containing solution storage tank 2 are arranged beside a first nickel-cobalt precipitation reaction tank 200, the mixed injection mechanism 3 is arranged on the top of the first nickel-cobalt precipitation reaction tank 200 and is connected with the lye storage tank 1, the magnesium-containing solution storage tank 2 and the first nickel-cobalt precipitation reaction tank 200 through pipelines, receives sodium hydroxide solution in the lye storage tank 1 and magnesium-containing solution in the magnesium-containing solution storage tank 2, and injects the mixed solution into the first nickel-cobalt precipitation reaction tank 200.

[0030] In the application, the sodium hydroxide solution is mixed with the magnesium-containing solution before being sent into the first nickel-cobalt precipitation reaction tank, and magnesium hydroxide precipitate is formed after the sodium hydroxide solution is mixed with the magnesium-containing solution, but the reaction time of magnesium and sodium hydroxide is short, and the formed crystal is small, when being injected into the first nickel-cobalt precipitation reaction tank 200, because the first nickel-cobalt precipitation reaction tank 200 contains a large amount of solution, the magnesium hydroxide precipitate can be quickly dissolved, and the effect of slow release of lye is achieved, so that the local over-alkaline condition in the first nickel-cobalt precipitation reaction tank is avoided, and the nickel-cobalt precipitation effect in the first nickel-cobalt precipitation reaction tank is ensured, and the quality of MHP products is improved.

[0031] In the embodiment, the lye storage tank 1 stores sodium hydroxide solution.

[0032] In the embodiment, the magnesium-containing solution storage tank 2 stores magnesium-containing solution.

[0033] In some possible embodiments, the magnesium-containing solution storage tank 2 is connected with a manganese removal device, and receives manganese-removed solution. The manganese-removed solution is poured into the magnesium-containing solution storage tank 2 as magnesium-containing solution. The advantage is that the problem of dilution with industrial water is avoided, and water resources are saved.

[0034] In the embodiment, a plurality of mixed injection mechanisms 3 are arranged on the top of the first nickel-cobalt precipitation reaction tank 200 in a circumferential uniform manner, and the first nickel-cobalt precipitation reaction tank 200 is provided with a plurality of feed ports corresponding to the mixed injection mechanisms 3 in a circumferential manner. The advantage of arranging a plurality of mixed injection mechanisms 3 is that the mixed solution of sodium hydroxide and magnesium-containing solution can be injected into the first nickel-cobalt precipitation reaction tank 200 from multiple points, which can improve the uniformity of input and the reaction rate on the one hand, and avoid the difficulty of quick dissolution of magnesium hydroxide particles caused by single-point injection, so that the magnesium hydroxide particles are coated in the nickel-cobalt hydroxide particles on the other hand.

[0035] In the embodiment, the mixing injection mechanism 3 comprises a static mixer 31, a lye input pump 32, and a magnesium-containing solution input pump 33. The input end of the lye input pump 32 is connected with the lye storage tank 1 by a pipeline, the input end of the magnesium-containing solution input pump 33 is connected with the magnesium-containing solution storage tank 2 by a pipeline, the output end of the lye input pump 32 and the output end of the magnesium-containing solution input pump 33 are connected with the input port of the static mixer 31 by pipelines, and the output port of the static mixer 31 is connected with a first-stage nickel-cobalt precipitation reaction tank 200 by a pipeline. The sodium hydroxide solution and the magnesium-containing solution are mixed in the static mixer 31 and then sent into the first-stage nickel-cobalt precipitation reaction tank 200.

[0036] In the embodiment, the mixing injection mechanism 3 further comprises a controller and a liquid discharge valve 34. The liquid discharge valve 34 is arranged at the output port of the static mixer 31, and the controller is electrically connected with the lye input pump 32, the magnesium-containing solution input pump 33, and the liquid discharge valve 34 to control the opening and closing of the lye input pump 32, the magnesium-containing solution input pump 33, and the liquid discharge valve 34.

[0037] In the embodiment, the mixing injection mechanism 3 further comprises a plurality of liquid level meters and a plurality of regulating pumps. The plurality of liquid level meters and the plurality of regulating pumps are arranged in one-to-one correspondence, and each liquid level meter and each regulating pump are arranged in cooperation with one of the lye storage tank 1, the magnesium-containing solution storage tank 2, and the first-stage nickel-cobalt precipitation bottom flow storage tank 4. The liquid level meter is used to detect the liquid level in the lye storage tank 1, the magnesium-containing solution storage tank 2, or the first-stage nickel-cobalt precipitation bottom flow storage tank. The controller is electrically connected with the liquid level meter and the regulating pump to control the opening and closing of the regulating pump according to the liquid level signal of the liquid level meter. When the liquid level signal detected by the liquid level meter is less than a first threshold value, the corresponding regulating pump is started, and when the liquid level signal detected by the liquid level meter is greater than a second threshold value, the corresponding regulating pump is stopped. The second threshold value is greater than the first threshold value.

[0038] In the embodiment, the controller controls the opening of the drain valve 34 and controls the flow rates of the alkali solution input pump 32 and the magnesium-containing solution input pump 33, so that the time for the alkali solution and the magnesium-containing solution to flow from the input port of the static mixer into the first-stage nickel-cobalt precipitation reaction tank 200 is not more than 5 minutes. If the reaction time of the sodium hydroxide and the magnesium ion solution is too long, the formed magnesium hydroxide precipitate will agglomerate, and the crystal size will gradually increase as the reaction time is prolonged. When the mixed solution is injected into the first-stage nickel-cobalt precipitation reaction tank 200, the magnesium hydroxide precipitate with a large particle size is difficult to be quickly dissolved, so the precipitate is easily wrapped by the nickel-cobalt precipitate. When the sodium hydroxide solution and the magnesium-containing solution are injected into the first-stage nickel-cobalt precipitation reaction tank 200 after a short reaction time (3-5 minutes), the formed magnesium hydroxide crystal has a small particle size because the reaction time of the magnesium and the sodium hydroxide is short. When the mixed solution is injected into the first-stage nickel-cobalt precipitation reaction tank, the magnesium hydroxide precipitate can be quickly dissolved because the first-stage nickel-cobalt precipitation reaction tank 200 contains a large amount of solution, so the magnesium hydroxide precipitate will not be wrapped in the nickel-cobalt hydroxide precipitate, and the magnesium will not be wrapped. Therefore, in the actual use process, 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 the magnesium ion solution in the static mixer, so that the magnesium hydroxide precipitate with a large particle size is avoided, and the quality of the MHP product is ensured.

[0039] The application also comprises a first-stage nickel-cobalt underflow storage tank 4, the liquid inlet end of the first-stage nickel-cobalt underflow storage tank 4 is in communication with the bottom of the first-stage nickel-cobalt precipitation reaction tank 200, and the liquid outlet end of the first-stage nickel-cobalt underflow storage tank 4 is in communication with the top of the first-stage nickel-cobalt precipitation reaction tank 200. The purpose is to add the nickel-cobalt hydroxide crystal in the first-stage nickel-cobalt underflow into the first-stage nickel-cobalt precipitation reaction tank 200 as a crystal seed to promote the better crystallization and growth of the nickel-cobalt in the first-stage nickel-cobalt precipitation reaction tank 200.

[0040] Referring to FIG. 3, the application further provides a MHP preparation system, which comprises the injection device 100, a first stage nickel-cobalt precipitation tank 200, a first stage nickel-cobalt thickener and a filter press 300. The injection device 100 is in communication with the first stage nickel-cobalt precipitation tank 200. The discharge end of the first stage nickel-cobalt precipitation tank 200 is in communication with the feed end of the first stage nickel-cobalt thickener. The underflow discharge end of the first stage nickel-cobalt thickener is in communication with the filter press 300. After the injection of the precipitant, the nickel and cobalt in the ore slurry in the first stage nickel-cobalt precipitation tank 200 will form a precipitate. Then the ore slurry containing the precipitate is injected into the first stage nickel-cobalt thickener. After the addition of a flocculating agent, the solid-liquid separation is performed. The underflow enters the filter press to form the MHP product. It is easy to understand that the first stage nickel-cobalt thickener is not shown in this embodiment, but this does not affect the understanding of those skilled in the art. The connection mode of the first stage nickel-cobalt thickener with the first stage nickel-cobalt precipitation tank 200 and the filter press 300 is a conventional mode in the art, and this embodiment does not describe it in detail.

[0041] In this embodiment, the MHP preparation system further comprises a second stage nickel-cobalt precipitation tank 400. The overflow discharge end of the first stage nickel-cobalt thickener is in communication with the second stage nickel-cobalt precipitation tank 400. The overflow of the first stage nickel-cobalt thickener enters the second stage nickel-cobalt tank 400 for treatment.

[0042] In order to better understand the application, the technical solutions of the application are described in detail below with reference to the drawings:

[0043] The controller controls the alkali input pump 32, the magnesium-containing solution input pump 32 and the discharge valve 33 to be opened synchronously. After the sodium hydroxide solution and the magnesium-containing solution are pumped into the static mixer 31 and mixed, the mixed solution flows into the first stage nickel-cobalt precipitation tank 200, and the nickel and cobalt are precipitated. In addition, the first stage nickel-cobalt underflow can be introduced into the first stage nickel-cobalt precipitation tank 200 through the first stage nickel-cobalt underflow storage tank 4 as a crystal seed to promote the better crystallization and growth of the nickel and cobalt in the first stage nickel-cobalt precipitation tank 200. After the reaction in the first stage nickel-cobalt precipitation tank 200 is completed, the underflow of the first stage nickel-cobalt thickener enters the filter press to form the MHP product. The time for the alkali and the magnesium-containing solution to flow from the input port of the static mixer into the first stage nickel-cobalt precipitation tank is not more than 5 minutes. The overflow of the first stage nickel-cobalt thickener enters the second stage nickel-cobalt tank 400 for treatment.

[0044] The application has the beneficial effects that: the injection device of the precipitant provided by the application comprises a lye storage tank, a magnesium-containing solution storage tank and a mixed injection mechanism, the lye storage tank and the magnesium-containing solution storage tank are arranged beside a first nickel-cobalt precipitation reaction tank, the mixed injection mechanism is arranged at the top of the first nickel-cobalt precipitation reaction tank and is connected with the lye storage tank, the magnesium-containing solution storage tank and the pipeline of the first nickel-cobalt precipitation reaction tank, is used for receiving sodium hydroxide solution in the lye storage tank and magnesium-containing solution in the magnesium-containing solution storage tank, and the sodium hydroxide solution and the magnesium-containing solution are mixed and then injected into the first nickel-cobalt precipitation reaction tank. In the application, the sodium hydroxide solution and the magnesium-containing solution are mixed and then sent into the first nickel-cobalt precipitation reaction tank, the sodium hydroxide solution and the magnesium-containing solution are mixed to form magnesium hydroxide precipitate, but the reaction time of magnesium and sodium hydroxide is relatively slow, the formed crystal is small, when the sodium hydroxide solution and the magnesium-containing solution are injected into the first nickel-cobalt precipitation reaction tank, because the first nickel-cobalt precipitation reaction tank contains a large amount of solution, the magnesium hydroxide precipitate can be quickly dissolved, the effect of slow release of lye is achieved, the situation that the inside of the first nickel-cobalt precipitation reaction tank is locally overalkaline is avoided, the nickel-cobalt precipitation effect in the first nickel-cobalt precipitation reaction tank is ensured, and the product quality of MHP is improved.

[0045] The specific implementation manner of the application described above does not constitute a limitation on the protection scope of the application. Any various other corresponding changes and modifications made according to the technical concept of the application should be included in the protection scope of the claims of the application.

Claims

1. An injection device of a precipitant for injecting a precipitant into a section of a reaction tank for depositing nickel and cobalt, characterized by, It comprises: alkali storage tank; magnesium-containing solution storage tank; and mixed injection mechanism arranged at the top of the first stage of nickel-cobalt precipitation reaction tank and connected with the alkali storage tank, the magnesium-containing solution storage tank and the first stage of nickel-cobalt precipitation reaction tank, which is used to receive the alkali in the alkali storage tank and the magnesium-containing solution in the magnesium-containing solution storage tank and mix and inject into the first stage of nickel-cobalt precipitation reaction tank within a set time.

2. The injection device of a precipitating agent according to claim 1, characterized in that It comprises a plurality of mixed injection mechanisms which are evenly arranged at the top of the first stage of nickel-cobalt precipitation reaction tank in a circumferential direction, and the top of the first stage of nickel-cobalt precipitation reaction tank is provided with a plurality of feed ports corresponding to the mixed injection mechanisms.

3. The injection device of the precipitant according to claim 1, characterized in that, The set time is 3-5 minutes.

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

5. The injection device of the precipitant according to claim 4, characterized in that, The mixed injection mechanism further comprises a controller and a liquid discharge valve, the liquid discharge valve is arranged at the output port of the static mixer, the controller is electrically connected with the alkali input pump, the magnesium-containing solution input pump and the liquid discharge valve, and is used to control the opening and closing of the alkali input pump, the magnesium-containing solution input pump and the liquid discharge valve.

6. The injection device of the precipitant according to claim 5, characterized in that The time for the alkali 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 is not more than 5 minutes.

7. The injection device of the precipitant according to claim 1, characterized in that, It further comprises a first stage of nickel-cobalt precipitation underflow storage tank, the liquid inlet end of the first stage of nickel-cobalt precipitation underflow storage tank is communicated with the underflow outlet end of the first stage of nickel-cobalt precipitation thickener, and the liquid outlet end of the first stage of nickel-cobalt precipitation underflow storage tank is communicated with the liquid inlet end of the mixed injection mechanism.

8. The injection device of the precipitant according to claim 5, characterized in that, The mixed injection mechanism further comprises a plurality of liquid level meters and a plurality of regulating pumps, the plurality of liquid level meters and the plurality of regulating pumps are arranged one by one in a one-to-one correspondence, and each liquid level meter and each regulating pump are arranged in cooperation with one of the alkali storage tank, the magnesium-containing solution storage tank and the first stage of nickel-cobalt precipitation underflow storage tank; the liquid level meter is used to detect the liquid level in the alkali storage tank or the magnesium-containing solution storage tank or the first stage of nickel-cobalt precipitation underflow storage tank, and the controller is used to control the opening and closing of the regulating pump according to the liquid level signal of the liquid level meter.

9. An MHP preparation system characterized by comprising: It comprises the injection device, the first stage of nickel-cobalt precipitation reaction tank, the first stage of nickel-cobalt precipitation thickener and the filter press, the injection device is communicated with the first stage of nickel-cobalt precipitation reaction tank, the discharge end of the first stage of nickel-cobalt precipitation reaction tank is communicated with the feed end of the first stage of nickel-cobalt precipitation thickener, and the underflow discharge end of the first stage of nickel-cobalt precipitation thickener is communicated with the filter press.

10. The MHP preparation system according to claim 9, wherein It further comprises a second stage of nickel-cobalt precipitation reaction tank, and the overflow discharge end of the first stage of nickel-cobalt precipitation thickener is communicated with the feed end of the second stage of nickel-cobalt precipitation reaction tank.

Images