Preparation method of battery grade nickel salt

Abstract

The invention provides a method for preparing battery-grade nickel salt, which relates to the technical field of batteries, and comprises the following steps: adding water and inorganic acid to a reaction vessel to form an acid solution; heating the acid solution to 90-110°C, and adding nickel powder Carry out the reaction, add nickel powder in the reaction process to maintain the nickel powder concentration and liquid-solid ratio of the reaction system, react for 14-20h, when the pH value of the solution is 3-5, the reaction ends, and the nickel salt solution is obtained; wherein, the acid solution The liquid-solid ratio with nickel powder is 4-6:1ml / g, and the amount of nickel powder added is 1.8-2.2 times of the theoretical consumption of nickel powder in the amount of inorganic acid; there is no baffle in the reaction vessel. The present invention optimizes the reaction conditions such as liquid-solid ratio, temperature, and nickel powder amount, and does not set baffles, so that the reaction rate is greatly increased, and the requirements can be met without adding hydrogen peroxide. The cost is low, green and safe, and the obtained nickel salt product is of high quality. , low impurity content.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for preparing battery-grade nickel salt. Background technique [0002] The preparation method of nickel salt in the prior art is to use nickel powder or nickel powder compacted lumps as raw materials, adding sulfuric acid or hydrochloric acid to react and dissolve to obtain nickel sulfate or nickel chloride solution, and then adjust the pH to 4-4 with hydrogen peroxide. 5.5, then carry out solid-liquid separation, and then evaporate and crystallize the solution to obtain refined nickel salt crystals. [0003] But the mode that uses hydrogen peroxide to regulate the pH of gained nickel solution to 4-5.5 has the following disadvantages: [0004] 1. The pH of hydrogen peroxide is about 4.5, so adjusting the pH with hydrogen peroxide will consume a large amount of hydrogen peroxide and greatly increase the cost; [0005] 2. Hydrogen peroxide is easily decomposed by heati...

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Problems solved by technology

[0004] 1. The pH of hydrogen peroxide is about 4.5, so adjusting the pH with hydrogen peroxide will consume a large amount of hydrogen peroxide and greatly increase the cost;

[0005] 2. Hydrogen peroxide is easily decomposed by heating to produce a large amount of O 2 , whose equation is: 2H 2 o 2 =2H 2 O+O 2 , When dissolving nickel powder with sulfuric acid or hydrochloric acid, it needs to be heated, which will also decompose hydrogen peroxide to generate a large amount of oxygen, which will increase the liquid level in the tank and cause the tank to leak. %;

[0006] 3. When sulfuric acid or hydrochloric acid reacts with nickel powder, a large amount of hydrogen gas will be generated, and its reaction formula is: Ni+H 2 SO 4 =NiSO 4 +H 2 , once an explosion occurs, the oxygen produced by the decomposition of hydrogen peroxide will become a combustion aid, making the fire bigger and faster, causing greater losses, and the mixture of hydrogen and oxygen is more prone to explosion hazards

[0007] 4. Industrial hydrogen peroxide contains heavy metal ions, adding hydrogen peroxide will introduce these impurity ions, which will affect product quality

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