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Method for preparing nickel chloride through sulfuric acid leaching of crude nickel hydroxide

A technology of nickel hydroxide and nickel chloride, which is applied in the field of hydrometallurgy, can solve problems such as high impurity content of nickel chloride, surrounding environmental pollution, and easy leakage of chlorine gas, and achieve high product quality, strong extraction ability, and chlorine gas reduction. The effect of using

Active Publication Date: 2017-05-31
JILIN JIEN NICKEL IND
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the high content of impurities such as cobalt, magnesium, manganese and zinc in the existing crude nickel hydroxide raw materials, in many methods, the disadvantages are that the process flow is long, the energy consumption is high, and the nickel chloride impurity content of the output is high. Crude nickel hydroxide raw materials have not been effectively utilized, and the existing common nickel concentrate chlorine gas leaching method, chlorine gas leaks easily will cause pollution to the surrounding environment

Method used

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  • Method for preparing nickel chloride through sulfuric acid leaching of crude nickel hydroxide
  • Method for preparing nickel chloride through sulfuric acid leaching of crude nickel hydroxide
  • Method for preparing nickel chloride through sulfuric acid leaching of crude nickel hydroxide

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preparation example Construction

[0024] Such as figure 1 As shown, the present invention proposes a kind of preparation method that takes crude nickel hydroxide as raw material sulfuric acid leaching to produce nickel chloride, it is characterized in that, the method comprises the steps:

[0025] Step 1, the sulfuric acid leaching process of nickel hydroxide comprises the following sub-steps:

[0026] Put the crude nickel hydroxide into the leaching tank, slowly add 93% concentrated sulfuric acid, control the speed of adding concentrated sulfuric acid to add 1.4L-1.5L concentrated sulfuric acid every 4 hours, control the temperature at 60°C-80°C, adjust the pH value to 1.0 to 2.0, to obtain ore pulp, separate the leached ore pulp from liquid to solid to obtain leaching slag and leachate; the leaching slag enters the slag washing tank and is washed with water to reduce the final slag nickel;

[0027] The leachate is transported to the neutralization tank, the temperature is raised to 60°C-80°C, sodium carbona...

Embodiment 1

[0040] Put 10kg of crude nickel hydroxide into the experimental leaching tank, control the speed of adding 93% concentrated sulfuric acid, adjust the pH value of the pulp to 1.3, and pump the filtrate into the neutralization tank after the pulp is press-filtered, raise the temperature to 80°C, and slowly add sodium carbonate Solid to pH 5.2, add 93% concentrated sulfuric acid, and the index of the liquid after neutralization is shown in the table below:

[0041]

[0042] Adjust the pH value of the neutralized liquid to 3.58 and send it to the extraction experiment system.

[0043] The flow rate of P204 extraction organic phase is 2.5L / h, the flow rate of lye is 0.2L / h, the flow rate of stock solution is 1.6L / h, the flow rate of washing acid is 0.15L / h, and the flow rate of stripping acid is 0.15L / h. Raffinate indicators are shown in the table below:

[0044]

[0045]The flow rate of P507 extraction agent is 2.6L / h for organic phase, 0.25L / h for lye, 1.6L / h for stock sol...

Embodiment 2

[0052] Put 10kg of crude nickel hydroxide into the experimental leaching tank, control the speed of adding 93% concentrated sulfuric acid, the pH value of the pulp reaches 1.27, after the pulp is filtered by pressure, the filtrate is pumped into the neutralization tank, the temperature is raised to 80 °C, and sodium carbonate solid is slowly added The pH value is 5.36, add 93% concentrated sulfuric acid, and the index of the liquid after neutralization is shown in the table below:

[0053]

[0054] Adjust the pH value of the neutralized solution to 3.67 and send it to the extraction experiment system.

[0055] The flow rate of P204 extraction organic phase is 2.5L / h, the flow rate of lye is 0.19L / h, the flow rate of stock solution is 1.5L / h, the flow rate of washing acid is 0.15L / h, and the flow rate of stripping acid is 0.15L / h. Raffinate indicators are shown in the table below:

[0056]

[0057] The flow rate of P507 extraction agent is 2.6L / h for organic phase, 0.26L...

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Abstract

The invention provides a method for preparing nickel chloride through sulfuric acid leaching of crude nickel hydroxide, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: carrying out concentrated sulfuric acid leaching on the crude nickel hydroxide to obtain a nickel sulfate solution, removing silicon and iron from the nickel sulfate solution, and allowing the obtained solution to enter an extraction system; carrying out extraction to remove Mn, Zn, Ca, Mg and other impurities from the nickel sulfate solution and recover Co, wherein the content of Mn, Zn, Ca and Co is reduced to 0.001 g / L or below, and the content of Mg is reduced to 0.05 g / L or below; carrying out extraction to convert the nickel sulfate solution into a nickel chloride solution; and carrying out evaporation, crystallization and centrifuge packaging to obtain the nickel chloride product. The method has the advantages of simplicity, effective control of the content of the impurities in the nickel chloride, obtaining of the high-quality nickel chloride product, and wide application.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a preparation method of nickel chloride. Background technique [0002] In the field of nickel chloride production, in the production of nickel chloride products, nickel chloride solution must first be produced. There are many methods for producing nickel chloride solution, including the reaction method of hydrochloric acid and electrolytic nickel, the method of reaction of hydrochloric acid and nickel carbonate, Nickel sulfate solution extraction full extraction-hydrochloric acid conversion method, nickel concentrate chlorine gas leaching method, hydrochloric acid leaching nickel cobalt hydroxide method, etc. Due to the high content of impurities such as cobalt, magnesium, manganese and zinc in the existing crude nickel hydroxide raw materials, in many methods, the disadvantages are that the process flow is long, the energy consumption is high, and the nickel ...

Claims

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Application Information

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IPC IPC(8): C01G53/09C22B3/38C22B23/00
CPCC01G53/003C01G53/09C22B23/0453C22B3/3844C22B3/3846Y02P10/20
Inventor 张东张宝剑闻松王英凯孙建成马志伟王秀合杨学明李泽峰赵飞张影
Owner JILIN JIEN NICKEL IND
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