Process for denitrogenation of a nickel-containing material by washing

Abstract

The present application belongs to the field of chemical metallurgy technology, and particularly relates to a washing denitrogenation method of a nickel-containing material. The present application provides a washing denitrogenation method of a nickel-containing material, which comprises the following steps: S1, first slurry preparation by mixing the nickel-containing material with a first washing liquid; S2, first mixing of the first slurry and an additive, first stirring and washing to obtain a first nickel-containing product; S3, second mixing of the first nickel-containing product and a second washing liquid, second stirring and washing to obtain a second nickel-containing product; and S4, third mixing of the second nickel-containing product and a third washing liquid, third stirring and washing to obtain a third nickel-containing product. In the additive, the cations are combined with the nitrogen-containing anions in the nickel-containing material to form soluble substances with extremely high solubility, so that the nitrogen-containing anions coated in the nickel-containing material are replaced or desorbed, and then the nickel-containing material and the nitrogen-containing anions are effectively separated by washing.

Description

Technical Field

[0001] This invention belongs to the field of chemical and metallurgical technology, and specifically relates to a method for washing and denitrifying nickel-containing materials. Background Technology

[0002] Nickel ore is an important metallic mineral resource in the national economy. With economic development, people's consumption of nickel ore resources has been increasing year by year, and the demand for nickel-containing materials has also been gradually expanding.

[0003] Currently, some nickel-bearing ore is produced using the nitric acid process, and then the nickel ore is precipitated to form nickel-bearing materials. However, the resulting nickel-bearing materials have a high nitrogen content. The presence of nitrogen leads to a low nickel content and poor quality in the nickel-bearing materials. Furthermore, in subsequent production, extraction is required to separate and purify the nickel-bearing materials. The excessively high nitrogen content causes the extractant to be oxidized and decomposed during the extraction process, resulting in significant losses. This affects the selling price of the nickel-bearing materials and the subsequent production and processing costs.

[0004] Current methods for denitrifying nickel-containing materials primarily involve direct water washing, resulting in a relatively high nitrogen content in the final nickel-containing material. Therefore, reducing the nitrogen content in nickel-containing materials and improving their quality is a pressing technical issue that needs to be addressed. Summary of the Invention

[0005] In view of this, the present invention provides a method for washing and denitrifying nickel-containing materials to obtain nickel-containing materials with lower nitrogen content; the process is efficient and simple, and has the advantages of being green, low-carbon and environmentally friendly, as well as great socio-economic value.

[0006] To address the aforementioned technical problems, this invention provides a method for washing and denitrifying nickel-containing materials, comprising the following steps:

[0007] Step S1: The nickel-containing material is mixed with the first washing liquid to form a first slurry;

[0008] Step S2: The first slurry and additives are first mixed, and then stirred and washed to obtain the first nickel-containing product;

[0009] Step S3: Mix the first nickel-containing product with the second washing solution and perform a second stirring and washing to obtain the second nickel-containing product;

[0010] Step S4: Mix the second nickel-containing product with the third washing solution and perform a third stirring and washing to obtain the third nickel-containing product.

[0011] Preferably, the additives include neutral salt additives, alkali additives, or weak acid-strong base salt additives; the neutral salt additives include one or more of sodium sulfate, potassium sulfate, and sodium carbonate; the alkali additives include one or more of sodium hydroxide, potassium hydroxide, urea, and ammonia; and the weak acid-strong base salt additives include one or more of sodium bicarbonate, potassium carbonate, sodium bicarbonate, and potassium bicarbonate.

[0012] Preferably, the mass ratio of the additive to the nickel-containing material is 0.1 to 1:1.

[0013] Preferably, the process after the first stirring and washing further includes: performing solid-liquid separation on the system after the first stirring and washing to obtain a first nickel-containing product and a first liquid phase, respectively;

[0014] The second stirring and washing process further includes: performing solid-liquid separation on the system after the second stirring and washing to obtain a second nickel-containing product and a second liquid phase, respectively;

[0015] The third stirring and washing process further includes solid-liquid separation of the system after the second stirring and washing process to obtain a third nickel-containing product and a third liquid phase, respectively.

[0016] Preferably, the first washing solution is a second liquid phase or water;

[0017] The second washing solution is the third liquid phase or water;

[0018] The third washing solution is water.

[0019] Preferably, the mass ratio of the first washing liquid to the nickel-containing material is 4 to 10:1;

[0020] The mass ratio of the second washing solution to the first nickel-containing product is 4 to 10:1;

[0021] The mass ratio of the third washing solution to the second nickel-containing product is 4 to 10:1.

[0022] Preferably, the first mixing, the second mixing, and the third mixing are carried out independently under stirring conditions.

[0023] Preferably, the first pulping time is 0.5 to 2 hours and the temperature is 50 to 100°C.

[0024] Preferably, the first stirring and washing time is 0.1 to 1 hour, and the temperature is 50 to 100°C;

[0025] The second stirring and washing time is 0.5 to 2 hours, and the temperature is 50 to 100°C;

[0026] The third stirring and washing process takes 0.5 to 2 hours and is carried out at a temperature of 50 to 100°C.

[0027] Preferably, the elemental composition of the nickel-containing material includes: 1.0-10 wt% Co, 10-40 wt% Ni, 2.0-10.0 wt% Al, 1.0-3.0 wt% Mn, and 1-8 wt% N.

[0028] This invention provides a washing and denitrification method for nickel-containing materials, comprising: step S1: firstly slurrying the nickel-containing material with a first washing liquid to obtain a first slurry; step S2: firstly mixing the first slurry with an additive, and performing a first stirring and washing to obtain a first nickel-containing product; step S3: secondly mixing the first nickel-containing product with a second washing liquid, and performing a second stirring and washing to obtain a second nickel-containing product; step S4: thirdly mixing the second nickel-containing product with a third washing liquid, and performing a third stirring and washing to obtain a third nickel-containing product. In this invention, the anions in the additive enter the adsorption layer of the interface phase on the surface of the nickel-containing material crystal through ion exchange adsorption, diffuse into the interior of the nickel-containing material crystal through electrostatic adsorption, and combine with metal cations. The cations in the additive react with the nitrogen-containing anions in the nickel-containing material to form highly soluble substances, displacing or desorbing the nitrogen-containing anions coated in the nickel-containing material. Subsequently, washing effectively separates the nickel-containing material and the nitrogen-containing anions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the process for denitrification treatment of nickel-containing materials in the example. Detailed Implementation

[0030] This invention provides a method for washing and denitrifying nickel-containing materials, comprising the following steps:

[0031] Step S1: The nickel-containing material is mixed with the first washing liquid to form a first slurry;

[0032] Step S2: The first slurry and additives are first mixed, and then stirred and washed to obtain the first nickel-containing product;

[0033] Step S3: Mix the first nickel-containing product with the second washing solution and perform a second stirring and washing to obtain the second nickel-containing product;

[0034] Step S4: Mix the second nickel-containing product with the third washing solution and perform a third stirring and washing to obtain the third nickel-containing product.

[0035] This invention involves first pulping a nickel-containing material with a first washing liquid to obtain a first slurry. In this invention, the nickel-containing material is preferably a product obtained through hydrometallurgical processing using a nitric acid solution. The method for obtaining the nickel-containing material preferably includes the following steps: leaching a mixture of nickel-containing ore and a nitric acid solution; performing solid-liquid separation on the leachate to obtain a nickel-containing solution; and mixing the nickel-containing solution with an alkaline precipitant to perform a precipitation reaction to obtain the nickel-containing material. In this invention, the nickel-containing ore preferably includes nickel sulfide ore and nickel oxide ore, more preferably nickel oxide ore. The nickel sulfide ore preferably includes pyrite, goethite, sulphite, and pyrrhotite, more preferably pyrite; the nickel oxide ore preferably includes laterite and nickel silicate ore, more preferably laterite. This invention does not have special requirements regarding the concentration and amount of the nitric acid solution; conventional methods in the art can be used. This invention does not have special requirements regarding the leaching process; conventional methods in the art can be used. In this invention, the alkaline precipitant preferably includes sodium hydroxide solution, sodium carbonate solution, potassium hydroxide solution, potassium carbonate solution, magnesium oxide slurry, or magnesium carbonate slurry, more preferably sodium hydroxide solution. This invention does not have particular limitations on the concentration and amount of the alkaline precipitant, as long as it can completely precipitate the nickel ions in the nickel-containing solution. This invention has no special requirements for the precipitation; conventional methods in the art are acceptable. In this invention, the precipitation process preferably further includes filtering the precipitated system to obtain the nickel-containing material. This invention has no special requirements for the filtration; conventional methods in the art are acceptable.

[0036] In this invention, the nickel-containing material preferably includes cobalt, nickel, aluminum, manganese, and nitrogen. The mass percentage of cobalt in the nickel-containing material is preferably 1.0–10%, more preferably 2–3%. The mass percentage of nickel in the nickel-containing material is preferably 10–40%, more preferably 20–35%, and even more preferably 25–30%. The mass percentage of aluminum in the nickel-containing material is preferably 2.0–10.0%, more preferably 4–5%. The mass percentage of manganese in the nickel-containing material is preferably 1.0–3.0%, more preferably 1–2%. The mass percentage of nitrogen in the nickel-containing material is preferably 1–8%, more preferably 1–5%, and even more preferably 1.5–3%. In this invention, the nitrogen in the nickel-containing material preferably exists in the form of nitrogen-containing anions, and the nitrogen-containing anions are preferably nitrate ions.

[0037] In this invention, the first washing liquid is preferably the second liquid phase or water, more preferably the second liquid phase. In this invention, the second liquid phase is the liquid phase obtained by solid-liquid separation of the system after the second stirring and washing. Using the second liquid phase as the first washing liquid reduces processing costs. The mass ratio of the first washing liquid to the nickel-containing material is preferably 4–10:1, more preferably 5–10:1. Increasing the mass ratio of the first washing liquid to the nickel-containing material can make nitrogen removal more thorough, but if the mass ratio is too large, the equipment required for the stirring and washing process will increase costs, and the large amount of washing liquid will increase the cost of subsequent wastewater treatment. Selecting a mass ratio of the first washing liquid to the nickel-containing material within the above range in this application can effectively remove nitrogen while reducing processing costs.

[0038] In this invention, the first pulping is preferably carried out under stirring conditions, the stirring speed is preferably 200-500 rpm, more preferably 300-400 rpm; the stirring time is preferably 0.5-2 h, more preferably 0.5-1 h; and the stirring temperature is preferably 50-100℃, more preferably 70-90℃.

[0039] After obtaining the first slurry, the present invention mixes the first slurry with the additives and performs a first stirring and washing to obtain a first nickel-containing product. In the present invention, the additives preferably include neutral salt additives, alkali additives, or weak acid-strong base salt additives, more preferably neutral salt additives; the neutral salt additives preferably include one or more of sodium sulfate, potassium sulfate, and sodium carbonate, more preferably sodium sulfate or potassium sulfate; the alkali additives preferably include one or more of sodium hydroxide, potassium hydroxide, urea, and ammonia water; the weak acid-strong base salt additives preferably include one or more of sodium bicarbonate, potassium carbonate, sodium bicarbonate, and potassium bicarbonate. In the present invention, the mass ratio of the additives to the nickel-containing material is preferably 0.1 to 1:1, more preferably 0.2:1.

[0040] In this invention, the first mixing is preferably the addition of an additive to the first slurry. In this invention, the first mixing is preferably carried out under stirring conditions. This invention has no special requirements on the stirring time, as long as the first slurry and the additive are sufficiently mixed. This invention also has no special requirements on the stirring speed, as long as the first slurry and the additive are sufficiently mixed.

[0041] In this invention, during the first stirring and washing process, the anions of the additive enter the adsorption layer of the interface phase on the surface of the nickel-containing material crystal through ion exchange adsorption, simultaneously displacing the nitrogen-containing anions on the crystal surface. The anions in the adsorption layer diffuse into the interior of the nickel-containing material crystal through electrostatic adsorption and combine with metal cations, while simultaneously displacing the nitrogen-containing anions inside the nickel-containing material to the adsorption layer on the surface of the nickel-containing material crystal. The cations in the additive of this invention react with the nitrogen-containing anions in the nickel-containing material to form highly soluble substances, displacing or desorbing the nitrogen-containing anions coated in the nickel-containing material. This invention, through the first stirring and washing process, displaces or desorbs the nitrogen-containing anions coated in the nickel-containing material, facilitating the effective separation of nitrogen-containing substances from the nickel-containing material through subsequent washing.

[0042] In this invention, the temperature of the first stirring and washing is preferably 50–100°C, more preferably 60–80°C, and even more preferably 70°C. At these temperatures, the present invention can effectively reduce production processing costs. In this invention, the time of the first stirring and washing is preferably 0.1–1 h, more preferably 0.5–1 h. In this invention, if the first stirring and washing time is too short, the denitrification effect will be poor; if the first stirring and washing time is too long, the processing cost will increase while reducing the processing capacity. The stirring and washing time specified in this invention can effectively denitrify nickel-containing materials while reducing processing costs.

[0043] In this invention, the process after the first stirring and washing preferably further includes: performing solid-liquid separation on the system after the first stirring and washing to obtain a first nickel-containing product and a first liquid phase, respectively. In this invention, the solid-liquid separation is preferably filtration. This invention does not have special requirements for the filtration; conventional methods in the art can be used.

[0044] After obtaining the first nickel-containing product, the present invention mixes the first nickel-containing product with a second washing liquid and performs a second stirring and washing to obtain a second nickel-containing product. In the present invention, the second washing liquid is preferably a third liquid phase or water, more preferably a third liquid phase; the third liquid phase is the liquid phase obtained by solid-liquid separation of the system after the third stirring and washing. The use of the third liquid phase as the second washing liquid reduces processing costs. In the present invention, the mass ratio of the second washing liquid to the first nickel-containing product is preferably 4–10:1, more preferably 5–10:1. Increasing the mass ratio of the second washing liquid to the first nickel-containing product can make nitrogen removal more thorough, but if the mass ratio is too large, the equipment required for the stirring and washing process will increase costs, and the large amount of washing liquid will increase the cost of subsequent wastewater treatment. Selecting a mass ratio of the second washing liquid to the first nickel-containing product within the above range can effectively remove nitrogen while reducing processing costs.

[0045] In this invention, the second mixing is preferably carried out under stirring conditions, and the system obtained by the second mixing is a second slurry. This invention has no special requirements on the stirring time, as long as the second washing liquid and the first nickel-containing product are sufficiently mixed. This invention also has no special requirements on the stirring speed, as long as the second washing liquid and the first nickel-containing product are sufficiently mixed.

[0046] In this invention, the temperature of the second stirring and washing is preferably 50-100°C, more preferably 60-80°C, and even more preferably 70°C. The temperature described in this invention can effectively reduce production processing costs. In this invention, the time of the second stirring and washing is preferably 0.1-1 h, more preferably 0.5-1 h. In this invention, the rotational speed of the second stirring is preferably 200-500 rpm, more preferably 300-400 rpm.

[0047] In this invention, the second stirring and washing process preferably further includes: performing solid-liquid separation on the system after the second stirring and washing to obtain a second nickel-containing product and a second liquid phase, respectively; the solid-liquid separation is preferably filtration. This invention does not have special requirements for the filtration; conventional methods in the art can be used.

[0048] After obtaining the second nickel-containing product, the present invention mixes the second nickel-containing product with a third washing solution and performs a third stirring and washing to obtain the third nickel-containing product. In the present invention, the third washing solution is preferably water. The mass ratio of the third washing solution to the second nickel-containing product is preferably 4 to 10:1, more preferably 5 to 10:1. Increasing the mass ratio of the third washing solution to the second nickel-containing product can make nitrogen removal more thorough, but if the mass ratio of the third washing solution to the second nickel-containing product is too large, the equipment required for the stirring and washing process will increase costs, and the large amount of washing solution will increase the cost of subsequent wastewater treatment. Selecting the mass ratio of the third washing solution to the second nickel-containing product within the above range can reduce treatment costs while effectively removing nitrogen.

[0049] In this invention, the third mixing is preferably carried out under stirring conditions, and the system obtained by the third mixing is a third slurry. This invention has no special requirements on the stirring time, as long as the third washing liquid and the second nickel-containing product are sufficiently mixed. This invention also has no special requirements on the stirring speed, as long as the third washing liquid and the second nickel-containing product are sufficiently mixed.

[0050] In this invention, the temperature of the third stirring and washing is preferably 50–100°C, more preferably 60–80°C, and even more preferably 70°C. At the temperature specified in this invention, production processing costs can be effectively reduced. In this invention, the time of the third stirring and washing is preferably 0.1–1 h, more preferably 0.5 h.

[0051] In this invention, the third stirring and washing process preferably further includes: performing solid-liquid separation on the system after the third stirring and washing to obtain a third nickel-containing product and a third liquid phase, respectively; the solid-liquid separation is preferably filtration. This invention does not have special requirements for the filtration; conventional methods in the art can be used.

[0052] In this invention, the anions in the additive enter the adsorption layer of the interface phase on the surface of nickel-containing material crystals through ion exchange adsorption, simultaneously displacing nitrogen-containing anions from the crystal surface. The anions in the adsorption layer diffuse into the interior of the nickel-containing material crystals through electrostatic adsorption and combine with metal cations, while simultaneously displacing nitrogen-containing anions from the interior of the nickel-containing material to the adsorption layer on the crystal surface. The cations in the additive react with the nitrogen-containing anions in the nickel-containing material to form highly soluble substances, displacing or desorbing the nitrogen-containing anions coated in the nickel-containing material. Subsequent washing effectively separates the nitrogen-containing anions from the nickel-containing material, reducing the nitrogen content to below 0.023%, thus achieving denitrification of the nickel-containing material.

[0053] Figure 1 This is a schematic diagram of the process for denitrification treatment of nickel-containing materials according to an embodiment of the present invention. Specifically, the nickel-containing material and a first washing liquid are stirred and pulped to obtain a first slurry; the first slurry and additives are mixed and subjected to a first stirring and washing, followed by filtration to obtain a first liquid phase and a first nickel-containing product; the first nickel-containing product is subjected to a second stirring and washing with a second washing liquid, followed by filtration to obtain a second liquid phase and a second nickel-containing product; the second nickel-containing product is subjected to a third stirring and washing with water, followed by filtration to obtain a third liquid phase and a third nickel-containing product; the second liquid phase is recycled as the first washing liquid used for stirring and pulping with the nickel-containing material; the third liquid phase is recycled as the second washing liquid used for washing the second nickel-containing product.

[0054] This invention uses nickel-containing materials as raw materials, and combines them with additives for stirring, washing, and separation of nitrates (nitrogen), resulting in nickel-containing materials with low nitrate (nitrogen) content. This not only reduces the difficulty and cost of processing nickel-containing materials, but also enriches the valuable metals in the nickel-containing materials. This invention uses a washing method to denitrate (nitrogenize) nickel-containing materials; the auxiliary materials are inexpensive, the processing cost is low, the reaction is fast, and the efficiency is high. The materials used in this invention are all common industrial products, easy to procure, and inexpensive; the entire process is short, low-cost, has a wide range of raw material sources, is easy to scale up, and is easily industrialized.

[0055] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0056] Example 1

[0057] The nickel-containing material with a mass percentage of Co of 2.61%, Ni of 26.3%, Al of 4.26%, Mn of 1.12%, and nitrogen of 1.55% was used as the treatment target; according to Figure 1 The process involves denitrification of nickel-containing materials; the specific sources of the nickel-containing materials are: leaching laterite nickel ore with nitric acid solution, filtering the leachate to obtain a nickel-containing solution; mixing the nickel-containing solution with sodium hydroxide solution to carry out a precipitation reaction, followed by filtration to obtain the nickel-containing material;

[0058] S1: The nickel-containing material and the second liquid phase are mixed at a liquid-solid mass ratio of 5:1 and stirred at 400 rpm for 1 hour at 70°C to obtain the first slurry.

[0059] S2: Add sodium sulfate as an additive to the first slurry for the first mixing. The amount of sodium sulfate is 0.2 times the mass of the nickel-containing material. After stirring and washing for 0.5 hours at 70℃ and 400rpm, filter to obtain the first nickel-containing product and the first liquid phase.

[0060] S3: The first nickel-containing material and the third liquid phase are mixed in a liquid-solid mass ratio of 5:1. After stirring and washing for 0.5 h at 70 °C and 400 rpm, the mixture is filtered to obtain the second nickel-containing product and the second liquid phase.

[0061] S4: The second nickel-containing material and the third liquid phase are mixed at a liquid-solid mass ratio of 5:1. After stirring and washing at 70°C and 400 rpm for 0.5 h, the mixture is filtered to obtain the third nickel-containing product and the third liquid phase.

[0062] Example 2

[0063] The specific steps for denitrification treatment of the nickel-containing material using the aluminum-containing material in Example 1 are as follows:

[0064] S1: The nickel-containing material and the second liquid phase are mixed at a liquid-solid mass ratio of 10:1 and stirred at 400 rpm for 1 hour at 70°C to obtain the first slurry.

[0065] S2: Add sodium sulfate as an additive to the first slurry for the first mixing. The amount of sodium sulfate is 0.2 times the mass of the nickel-containing material. After stirring and washing for 1 hour at 70℃ and 400rpm, filter to obtain the first nickel-containing product and the first liquid phase.

[0066] S3: The first nickel-containing material and the third liquid phase are mixed in a liquid-solid mass ratio of 10:1. After stirring and washing for 1 hour at 70°C and 400 rpm, the mixture is filtered to obtain the second nickel-containing product and the second liquid phase.

[0067] S4: The second nickel-containing material and the third liquid phase are mixed at a liquid-solid mass ratio of 10:1. After stirring and washing at 70°C and 400 rpm for 0.5 h, the mixture is filtered to obtain the third nickel-containing product and the third liquid phase.

[0068] Comparative Example 1

[0069] The specific steps for denitrification treatment of the nickel-containing material using the aluminum-containing material in Example 1 are as follows:

[0070] S1: The nickel-containing material and the second liquid phase are mixed at a liquid-solid mass ratio of 10:1 and stirred at 400 rpm for 1 hour at 80°C to obtain the first slurry.

[0071] S2: The first slurry was stirred and washed at 80°C and 400 rpm for 1 hour and then filtered to obtain the first nickel-containing product and the first liquid phase;

[0072] S3: The first nickel-containing material and the third liquid phase are mixed at a liquid-solid mass ratio of 10:1, and then stirred and washed for 1 hour at 80°C and 400 rpm before filtration to obtain the second nickel-containing product and the second liquid phase.

[0073] S4: The second nickel-containing material is mixed with water at a liquid-solid mass ratio of 10:1, and then stirred and washed for 1 hour at 80℃ and 400rpm before filtration to obtain the third nickel-containing product and the third liquid phase.

[0074] The mass percentages of N, Co, Ni, Al, and Mn elements in the third nickel-containing products obtained from Examples 1-2 and Comparative Example 1 were determined using colorimetry and ICP detection methods, and the results are listed in Table 1. The nitrogen removal rate in the nickel-containing materials was calculated according to Formula 1, and the results are listed in Table 1.

[0075]

[0076] Where m is the nitrogen removal rate, S0 is the mass percentage of nitrogen in the nickel-containing material, and S1 is the mass percentage of nitrogen in the third nickel-containing material.

[0077] Table 1. Component content of the third nickel-containing product in Examples 1-2 and Comparative Example 1.

[0078]

[0079] As can be seen from the test results of Examples 1 and 2 in Table 1, denitrification is more thorough with the increase of the washing liquid-to-solid ratio and the extension of the washing time. As can be seen from the test results of Examples 1, 2 and Comparative Example 1 in Table 1, the denitrification method provided by this invention can effectively remove nitrogen-containing anions from nickel-containing materials.

[0080] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for washing and denitrifying nickel-containing materials, characterized in that, Includes the following steps: Step S1: The nickel-containing material is mixed with the first washing liquid to form a first slurry; Step S2: The first slurry and additives are first mixed, and then stirred and washed to obtain the first nickel-containing product; Step S3: Mix the first nickel-containing product with the second washing solution and perform a second stirring and washing to obtain the second nickel-containing product; Step S4: Mix the second nickel-containing product with the third washing solution and perform a third stirring and washing to obtain the third nickel-containing product; The additives include one or more of sodium sulfate and potassium sulfate; The mass ratio of the additive to the nickel-containing material is 0.1 to 1:1; The process after the first stirring and washing also includes: performing solid-liquid separation on the system after the first stirring and washing to obtain a first nickel-containing product and a first liquid phase, respectively; The second stirring and washing process further includes: performing solid-liquid separation on the system after the second stirring and washing to obtain a second nickel-containing product and a second liquid phase, respectively; The third stirring and washing process also includes solid-liquid separation of the system after the second stirring and washing to obtain a third nickel-containing product and a third liquid phase, respectively. The first washing solution is a second liquid phase or water; the second washing solution is a third liquid phase or water; the third washing solution is water; The mass ratio of the first washing liquid to the nickel-containing material is 4~10:1; the mass ratio of the second washing liquid to the first nickel-containing product is 4~10:1; the mass ratio of the third washing liquid to the second nickel-containing product is 4~10:

1. The first pulping time is 0.5~2h, and the temperature is 50~100℃; The first stirring and washing time is 0.1~1h, and the temperature is 50~100℃; the second stirring and washing time is 0.5~2h, and the temperature is 50~100℃; the third stirring and washing time is 0.5~2h, and the temperature is 50~100℃. The method for preparing the nickel-containing material includes the following steps: The nickel-containing ore is mixed with a nitric acid solution for leaching. The leachate is then subjected to solid-liquid separation to obtain a nickel-containing solution. The nickel-containing solution is then mixed with an alkaline precipitant for precipitation to obtain the nickel-containing material.

2. The method according to claim 1, characterized in that, The first, second, and third mixtures are carried out independently under stirring conditions.

3. The method according to claim 1, characterized in that, The elemental composition of the nickel-containing material includes: 1.0~10wt%Co, 10~40wt%Ni, 2.0~10.0wt%Al, 1.0~3.0wt%Mn, and 1~8wt%N.

Images