Method for extracting nickel, cobalt and manganese elements from serpentine

Abstract

The invention provides a method for extracting nickel, cobalt and manganese elements from serpentine. The method comprises the steps that S1, serpentine is subjected to acid leaching, and leaching filtrate is obtained; carrying out iron and aluminum removal reaction on the leached filtrate to obtain iron and aluminum slag and first filtrate; s2, mixing the first filtrate with a first precipitant for nickel-cobalt precipitation reaction to obtain a nickel-cobalt product and second filtrate; and S3, mixing the second filtrate with a second precipitant, and carrying out a manganese precipitation reaction to obtain a manganese product and a magnesium-containing solution. According to the method, metal elements in the serpentine can be effectively separated, and high-value metal resources (such as nickel, cobalt and manganese) are enriched and recycled, so that the low-value serpentine is converted into a nickel-cobalt-manganese product with a high additional value, the overall utilization rate of the serpentine is increased, the problem of difficulty in subsequent impurity removal of the leachate is solved, and the method is suitable for industrial production. And meanwhile, the problem that the amount of waste residues is large after a magnesium product is prepared through serpentine wet smelting is solved, good social benefits are achieved, and the method has important significance on comprehensive utilization of serpentine ore.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrometallurgy, and in particular, to a method for extracting nickel, cobalt, and manganese elements from serpentine. Background Art

[0002] Serpentine is a natural hydrated magnesium silicate mineral with a layered structure. The main valuable elements are magnesium and silicon. In addition, there are also components such as Al, Fe, Mn, Cr, and Ni. Serpentine has rich reserves in China. After deep processing, a series of products with excellent quality, high added value, and tight market demand can be produced, and it has high comprehensive development and utilization value.

[0003] Currently, most of the smelting processes of serpentine aim to produce magnesium products, while other valuable metal elements in serpentine are generally landfilled in the form of waste residue, resulting in a great waste of resources and environmental pollution. With the increasing depletion of resources and the increasingly strict requirements for the discharge of industrial three wastes, it is very necessary to utilize the nickel, cobalt, manganese and other valuable metal elements in serpentine. Summary of the Invention

[0004] The main purpose of the present invention is to provide a method for extracting nickel, cobalt, and manganese elements from serpentine, so as to solve the problem of waste of resources caused by the common landfill treatment of nickel, cobalt, manganese and other valuable metal elements in serpentine in the form of waste residue in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, a method for extracting nickel, cobalt, and manganese elements from serpentine is provided. The method includes: Step S1, acid-leaching the serpentine to obtain a leaching filtrate; performing an iron and aluminum removal reaction on the leaching filtrate to obtain an iron and aluminum slag and a first filtrate; Step S2, mixing the first filtrate with a first precipitant to perform a nickel and cobalt precipitation reaction to obtain nickel and cobalt products and a second filtrate; Step S3, mixing the second filtrate with a second precipitant to perform a manganese precipitation reaction to obtain manganese products and a magnesium-containing solution.

[0006] Further, the acid leaching includes atmospheric pressure acid leaching and / or pressure acid leaching; preferably, the acid solution used for acid leaching is sulfuric acid and / or hydrochloric acid, preferably the concentration of the acid solution is greater than 30 wt.%, and more preferably when the acid solution is sulfuric acid, the concentration of the acid solution is greater than 85 wt.%.

[0007] Further, the iron and aluminum removal reaction includes atmospheric pressure iron and aluminum removal reaction or pressure iron and aluminum removal reaction.

[0008] Further, the first precipitant and the second precipitant are each independently selected from one or more of magnesium oxide, magnesium hydroxide, and basic magnesium carbonate.

[0009] Further, in steps S2 and S3, before use, the first precipitating agent and the second precipitating agent are respectively dissolved in water to form a first precipitating agent solution and a second precipitating agent solution. More preferably, the concentrations of the first precipitating agent solution and the second precipitating agent solution are each independently 5-15 wt.%.

[0010] Further, in step S2, during the nickel-cobalt precipitation reaction, the pH value of the reaction system is controlled to be 7.0-8.0, and the reaction temperature is 40-60°C; preferably, in step S3, during the manganese precipitation reaction, one or more of air, oxygen, or hydrogen peroxide are added as oxidants, and the pH value of the reaction system is controlled to be 7.5-8.5, and the reaction temperature is 40-60°C.

[0011] Further, in step S2, the recovery rate of nickel element in the nickel-cobalt product is 90-98%, and the recovery rate of cobalt element in the nickel-cobalt product is 85-95%; in step S3, the recovery rate of manganese element in the manganese product is 90-95%.

[0012] Further, the nickel content in the nickel-cobalt product is 25-65 wt.%, the Co content is 0.5-5 wt.%, and the moisture content is 30-70 wt.%.

[0013] Further, the manganese content in the manganese product is 2-15 wt.%, and the moisture content is 20-60 wt.%.

[0014] Further, the concentration of magnesium in the magnesium-containing solution is 30-70 g / L; the magnesium-containing solution is post-treated to obtain a magnesium product. Preferably, the magnesium product is selected from any one of magnesium oxide, basic magnesium carbonate, high-purity magnesium sulfate, or magnesium chloride; preferably, when the magnesium product is magnesium oxide, the magnesium oxide is used in the nickel-cobalt precipitation reaction in step S2 and / or the manganese precipitation reaction in step S3.

[0015] Applying the technical solution of the present invention, the method of the present application can effectively separate the metal elements in serpentine and enrich and recover high-value metal resources (such as nickel, cobalt, manganese, etc.), thereby converting low-value serpentine into high-value nickel-cobalt-manganese products, which not only improves the overall utilization rate of serpentine, but also solves the problem of difficult subsequent impurity removal in the leaching solution. At the same time, it can avoid the problem of a large amount of waste residue after wet smelting of serpentine to produce magnesium products, has good social benefits, and is of great significance for the comprehensive utilization of serpentine ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1The flowchart shows how the present application prepares nickel-cobalt-manganese products using serpentine. Detailed implementation manners

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] As analyzed in the background art, the main elements in serpentine are magnesium and silicon, and in addition, there are also components such as Al, Fe, Mn, Cr, Ni, etc. However, in the existing technology, most of the smelting processes of serpentine aim to produce magnesium products, and other valuable metal elements in serpentine are generally landfilled in the form of waste residues, resulting in a great waste of resources and causing environmental pollution. To solve the above problems, the present application provides a method for extracting nickel, cobalt, and manganese elements from serpentine.

[0020] In a typical implementation manner, a method for extracting nickel, cobalt, and manganese elements from serpentine is provided. The method includes: Step S1, acid-leaching the serpentine to obtain a leaching filtrate; performing an iron-aluminum removal reaction on the leaching filtrate to obtain an iron-aluminum slag and a first filtrate; Step S2, mixing the first filtrate with a first precipitant to perform a nickel-cobalt precipitation reaction to obtain a nickel-cobalt product and a second filtrate; Step S3, mixing the second filtrate with a second precipitant to perform a manganese precipitation reaction to obtain a manganese product and a magnesium-containing solution.

[0021] In the present application, through acid leaching, a silicon slag and a leaching filtrate are obtained, and then an iron-aluminum removal reaction is performed on the leaching filtrate to completely remove the iron element in the solution in a conventional iron removal or pressure iron removal manner, thereby forming an iron-aluminum slag and a first filtrate. No further iron removal is required subsequently to prevent the precipitation of Fe element as impurities during the subsequent nickel-cobalt-manganese precipitation process. First, the nickel-cobalt precipitation reaction is performed on the first filtrate. By adjusting the end-point pH value of the precipitation reaction, it can be controlled that only nickel and cobalt precipitate, while manganese does not precipitate, thereby obtaining a second filtrate and a nickel-cobalt slag. Then, an oxidation manganese precipitation reaction is performed on the second filtrate to obtain a magnesium-containing solution and a manganese slag. The high-magnesium solution is used to prepare magnesium products downstream, thereby enriching and recovering elements such as nickel, cobalt, and manganese. Since the pH values for nickel-cobalt and manganese precipitation are different, as the pH value increases, first nickel and cobalt precipitate, and then manganese precipitates.

[0022] The method of the present application can effectively separate the metal elements in serpentine and enrich and recover high-value metal resources (such as nickel, cobalt, manganese, etc.), thereby converting low-value serpentine into high-value-added nickel-cobalt-manganese products. This not only improves the overall utilization rate of serpentine but also solves the problem of difficult subsequent impurity removal of the leaching solution. At the same time, it can avoid the problem of a large amount of waste residues after wet smelting of serpentine to produce magnesium products, has good social benefits, and is of great significance to the comprehensive utilization of serpentine ore.

[0023] Meanwhile, when the method of the present application is applied, there is no generation of a large amount of waste gas, waste liquid, and waste residue during the process of extracting high-value metal resources. The product yield within the production cycle is high, and the added value of the serpentine ore products is increased. On the one hand, the problem of industrial three wastes can be solved, and on the other hand, the waste of high-value nickel and cobalt resources can be avoided, and the comprehensive utilization value of serpentine is improved.

[0024] The present application has no particular limitation on the acid leaching method, as long as it can dissolve the metal ions in the serpentine ore. In some embodiments, the acid leaching process can be atmospheric pressure acid leaching and / or pressure acid leaching. In order to dissolve as many metal ions in the serpentine ore as possible, it is preferred that the acid solution used for acid leaching includes sulfuric acid and / or hydrochloric acid. It is preferred that the concentration of the acid solution is greater than 30 wt.%, and more preferably when the acid solution is sulfuric acid, the concentration of the acid solution is greater than 85 wt.%.

[0025] In order to separate iron, aluminum, and other metal ions in the leaching filtrate, in some embodiments, the iron and aluminum removal reaction is a conventional or pressure iron and aluminum removal reaction. After the serpentine leaching filtrate undergoes the iron and aluminum removal reaction, the iron and aluminum metal ions form iron and aluminum slag and are removed, while other metal ions (such as nickel, cobalt, manganese, magnesium, etc.) remain in the solution, thereby achieving the purpose of separation and extraction.

[0026] The present application has no particular limitation on the type of precipitant, as long as it can precipitate metal elements such as nickel, cobalt, and manganese without introducing other impurity elements. In some embodiments, the above-mentioned first precipitant and the above-mentioned second precipitant are each independently selected from one or more of magnesium oxide, magnesium hydroxide, and basic magnesium carbonate.

[0027] In some embodiments, in steps S2 and S3, before use, the first precipitant and the second precipitant are respectively dissolved in water to form a first precipitant solution and a second precipitant solution. More preferably, the mass concentrations of the first precipitant solution and the second precipitant solution are each independently 5-15 wt.%. If the concentrations of the above-mentioned first precipitant solution and second precipitant solution are too high, it will cause incomplete utilization of the precipitant and inclusions to appear in the nickel, cobalt, and manganese slag. If the concentrations of the above-mentioned first precipitant solution and second precipitant solution are too low, the nickel, cobalt, and manganese ions in the solution will not be completely precipitated.

[0028] In order to fully precipitate metal elements such as nickel, cobalt, and manganese in the filtrate, it is necessary to create an alkaline environment with an appropriate pH value according to the different metal ions. In some embodiments, in step S2, the pH value of the nickel-cobalt precipitation reaction is 7.0 - 8.0; if the pH value is too low, the precipitation of nickel and cobalt elements in the filtrate will be incomplete, affecting the purity of the second filtrate. Considering economic costs and energy consumption, the pH value of this precipitation reaction should not be too high either, otherwise, a large amount of Mn and Mg elements will be contained in the nickel-cobalt slag. Preferably, in step S3, the pH value of the manganese precipitation reaction is 7.5 - 8.5. If the pH value is too low in the above reaction, the Mn element cannot be extracted from the filtrate, and impurity elements may precipitate, thus affecting the purity of the manganese product.

[0029] By using the method of the present application, the recovery rates of metal elements such as nickel, cobalt, and manganese are relatively high, and the high-content metal elements in serpentine can be effectively recovered, avoiding waste of resources. In some embodiments, in step S2, the recovery rate of nickel element in the nickel-cobalt product is 90 - 98%, and the recovery rate of cobalt element in the nickel-cobalt product is 85 - 95%; in step S3, the recovery rate of manganese element in the manganese product is 90 - 95%.

[0030] The nickel content in the nickel-cobalt product is 25 - 65 wt.%, the Co content is 0.5 - 5 wt.%, and the moisture content is 30 - 70 wt.%. The mass content of manganese in the above manganese product is 2 - 15 wt.%, and the moisture content is 20 - 60 wt.%. The products of the present application only contain nickel and cobalt elements, have a relatively high purity, and can be directly applied to the market.

[0031] The concentration of magnesium in the magnesium-containing solution obtained by the above method is 30 - 70 g / L; the magnesium content in this magnesium-containing solution is relatively high, and it can also be used for preparing magnesium products after post-treatment. Preferably, the magnesium product is selected from any one of magnesium oxide, basic magnesium carbonate, and high-purity magnesium sulfate.

[0032] Preferably, when the magnesium product is magnesium oxide, the magnesium oxide is used in the nickel-cobalt precipitation reaction in step S2 and / or the manganese precipitation reaction in step S3. The product can be recycled to achieve the effect of self-supply, without the need to purchase reagents externally, reducing costs.

[0033] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0034] The composition of the serpentine used in the embodiments of the present application is shown in Table 1.

[0035] Table 1

[0036] Magnesium (wt%) Silicon (wt%) Iron (wt%) Aluminum (wt%) Nickel (wt%) Cobalt (wt%) Manganese (wt%) Serpentine 21.5 16.3 5.4 0.53 0.21 0.03 0.11

[0037] Example 1

[0038] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 95 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A first MgO solution with a concentration of 10 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 50 °C. After adjusting the pH value to 7.0 with the first MgO solution, a nickel and cobalt product and a second filtrate are obtained through filtration. The nickel and cobalt product contains 30 wt.% nickel, 3 wt.% cobalt, and a water content of 40 wt.%. A second MgO solution with a concentration of 10 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant. The reaction temperature is 40 °C. After adjusting the pH value to 7.5 with the second MgO solution, a high-magnesium solution and a manganese product are obtained through filtration. The above manganese product contains 5 wt.% manganese and a water content of 40 wt.%. The above high-magnesium solution is processed through processes such as roasting to obtain magnesium products such as MgO. The obtained MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0039] Example 2

[0040] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 85 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A first MgO solution with a concentration of 5 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 60 °C. After adjusting the pH value to 8.0, a nickel and cobalt product and a second filtrate are obtained through filtration. The nickel and cobalt product contains 65 wt.% nickel, 5 wt.% cobalt, and a water content of 70 wt.%. A second MgO solution with a mass concentration of 5 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and oxygen is introduced as an oxidant. The reaction temperature is 60 °C. After adjusting the pH value to 8.5, a high-magnesium solution and a manganese product are obtained through filtration. The above manganese product contains 15 wt.% manganese and a water content of 60 wt.%. The above high-magnesium solution is processed to obtain magnesium products such as MgO. The obtained MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0041] Example 3

[0042] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 98 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A first MgO solution with a concentration of 15 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 40 °C. After the pH value is adjusted to 7.5, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 25 wt.% nickel, 0.5 wt.% cobalt, and 30 wt.% water content. A second MgO solution with a concentration of 15 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and hydrogen peroxide is added as an oxidant at the same time. The reaction temperature is 50 °C. After the pH value is adjusted to 8.0, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 2 wt.% manganese and 20 wt.% water; the above high-magnesium solution is processed to obtain magnesium products such as MgO, and the obtained MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0043] Example 4

[0044] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 90 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A first MgO solution with a concentration of 10 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 30 °C. After the pH value is adjusted to 6.5, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 10 wt.% nickel, 0.2 wt.% cobalt, and 30 wt.% water content. A second MgO solution with a concentration of 15 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant at the same time. The reaction temperature is 30 °C. After the pH value is adjusted to 7.8, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 0.5 wt.% manganese and 40 wt.% water; the high-magnesium solution has a high content of impurity elements and it is difficult to obtain magnesium products through treatment.

[0045] Example 5

[0046] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a hydrochloric acid solution with a concentration of 30 wt.%), and a leaching filtrate is obtained. After subjecting the above leaching filtrate to an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A magnesium hydroxide solution with a concentration of 10 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 50 °C, and after adjusting the pH value to 7.0, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 30 wt.% nickel, 3 wt.% cobalt, and a water content of 40 wt.%. A basic magnesium carbonate solution with a concentration of 10 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant. After the reaction temperature is adjusted to 60 °C and the pH value is adjusted to 7.5, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 5 wt.% manganese and 40 wt.% water; the above high-magnesium solution is processed to obtain magnesium products such as MgO, and the obtained MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0047] Example 6

[0048] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 98 wt.%), and a leaching filtrate is obtained. After subjecting the above leaching filtrate to an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A first MgO solution with a concentration of 10 wt.% is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 60 °C, and after adjusting the pH value to 6.0, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 5 wt.% nickel, 0.1 wt.% cobalt, and a water content of 60 wt.%. A second MgO solution with a mass concentration of 10 wt.% is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant. The reaction temperature is 50 °C, and after adjusting the pH value to 7.5, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 1 wt.% manganese, 2 wt.% nickel, 0.08 wt.% cobalt, and 40 wt.% water; the above high-magnesium solution is processed to obtain magnesium products such as MgO, and the obtained MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0049] Example 7

[0050] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 98 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A 10 wt.% MgO solution is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 60 °C. After the pH value is adjusted to 8.5, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 10 wt.% nickel, 1 wt.% cobalt, 1 wt.% manganese, 15 wt.% magnesium, and a water content of 40 wt.%. A 10 wt.% MgO solution is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant. The reaction temperature is 60 °C. After the pH value is adjusted to 9.0, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 0.1 wt.% manganese, 40 wt.% magnesium, and 40 wt.% water; the above high-magnesium solution is processed to obtain magnesium products such as MgO, and the prepared MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0051] Example 8

[0052] Serpentine is subjected to atmospheric pressure acid leaching (the acid solution is a sulfuric acid solution with a concentration of 98 wt.%), and a leaching filtrate is obtained. After the above leaching filtrate undergoes an iron and aluminum removal reaction, an iron and aluminum slag and a first filtrate are obtained. A 10 wt.% first MgO solution is added to the first filtrate for a first-stage nickel and cobalt precipitation reaction. The reaction temperature is 50 °C. After the pH value is adjusted to 7.0, nickel and cobalt products and a second filtrate are obtained through filtration; the nickel and cobalt products contain 30 wt.% nickel, 3 wt.% cobalt, and a water content of 40 wt.%. A 10 wt.% second MgO solution is added to the above second filtrate for a second-stage manganese precipitation reaction, and air is introduced as an oxidant. The reaction temperature is 50 °C. After the pH value is adjusted to 9, a high-magnesium solution and manganese products are obtained through filtration; the above manganese products contain 2 wt.% manganese, 30 wt.% magnesium, and 40 wt.% water; the above high-magnesium solution is processed to obtain magnesium products such as MgO, and the prepared MgO can be used in the above nickel and cobalt precipitation reaction and manganese precipitation reaction.

[0053] Table 2

[0054]

[0055]

[0056] Table 3

[0057]

[0058]

[0059] In Example 7, due to the too high pH value, there are more impurity elements Mg, and the product purity is relatively low.

[0060] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: The applied method can effectively separate the metal elements in serpentine and enrich and recover high-value metal resources (such as nickel, cobalt, manganese, etc.), thereby converting low-value serpentine into high-added-value nickel-cobalt-manganese products. This not only improves the overall utilization rate of serpentine, but also solves the problem of difficult subsequent impurity removal in the leaching solution. At the same time, it can avoid the problem of a large amount of waste residue after wet smelting of serpentine to produce magnesium products, has good social benefits, and is of great significance to the comprehensive utilization of serpentine ore.

[0061] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for extracting nickel, cobalt, and manganese elements from serpentine, characterized in that, The method includes: Step S1: subjecting serpentine to acid leaching to obtain a leaching filtrate; performing an iron and aluminum removal reaction on the leaching filtrate to obtain an iron and aluminum slag and a first filtrate; Step S2: mixing the first filtrate with a first precipitant to perform a nickel and cobalt precipitation reaction to obtain a nickel and cobalt product and a second filtrate; Step S3: mixing the second filtrate with a second precipitant to perform a manganese precipitation reaction to obtain a manganese product and a magnesium-containing solution.

2. The method according to claim 1, wherein The acid leaching includes atmospheric pressure acid leaching and / or pressure acid leaching; preferably, the acid solution used for the acid leaching is sulfuric acid and / or hydrochloric acid, preferably the concentration of the acid solution is greater than 30 wt.%, and more preferably when the acid solution is sulfuric acid, the concentration of the acid solution is greater than 85 wt.%.

3. The method according to claim 1 or 2, characterized in that, The iron and aluminum removal reaction includes an atmospheric pressure iron and aluminum removal reaction or a pressure iron and aluminum removal reaction.

4. The method according to any one of claims 1 to 3, characterized in that, The first precipitant and the second precipitant are each independently selected from one or more of magnesium oxide, magnesium hydroxide, and basic magnesium carbonate.

5. The method according to claim 1, wherein In Step S2 and Step S3, before use, the first precipitant and the second precipitant are respectively dissolved in water to form a first precipitant solution and a second precipitant solution, and more preferably, the concentrations of the first precipitant solution and the second precipitant solution are each independently 5 to 15 wt.%.

6. The method according to claim 1, wherein In Step S2, during the nickel and cobalt precipitation reaction, the pH value of the reaction system is controlled to be 7.0 to 8.0, and the reaction temperature is 40 to 60 °C; Preferably, in Step S3, during the manganese precipitation reaction, an oxidant selected from one or more of air, oxygen, and hydrogen peroxide is added simultaneously, the pH value of the reaction system is controlled to be 7.5 to 8.5, and the reaction temperature is 40 to 60 °C.

7. The method according to any one of claims 1 to 6, wherein in Step S2, the recovery rate of nickel element in the nickel and cobalt product is 90 to 98%, and the recovery rate of cobalt element in the nickel and cobalt product is 85 to 95%; in Step S3, the recovery rate of manganese element in the manganese product is 90 to 95%.

8. The method according to any one of claims 1 to 6, characterized in that, The nickel and cobalt product contains 25 to 65 wt.% of nickel, 0.5 to 5 wt.% of Co, and 30 to 70 wt.% of water content.

9. The method according to any one of claims 1 to 6, characterized in that, The manganese product contains 2 to 15 wt.% of manganese and 20 to 60 wt.% of water content.

10. The method according to any one of claims 1 to 6, characterized in that, The concentration of magnesium in the magnesium-containing solution is 30 to 70 g / L; the magnesium-containing solution is post-treated to obtain a magnesium product, and preferably the magnesium product is selected from any one of magnesium oxide, basic magnesium carbonate, high-purity magnesium sulfate, and magnesium chloride; Preferably, when the magnesium product is magnesium oxide, the magnesium oxide is used for the nickel and cobalt precipitation reaction in Step S2 and / or the manganese precipitation reaction in Step S3.

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