Method for preparing electrodeposited nickel by using crude nickel sulfate

Abstract

The invention provides a method for preparing electrodeposited nickel by using crude nickel sulfate. The method comprises the following steps: mixing a crude nickel sulfate solution and goethite seed crystals at 90-115 DEG C, adding a reducing agent, controlling the concentration of ferric iron not to exceed 2g / L, regulating the pH value to 2.5-4 by using a sodium hydroxide solution, reacting until no precipitate is produced, and filtering to obtain filtrate and FeOOH crystals; the crude nickel sulfate solution comprises nickel ions, iron ions, copper ions and zinc ions; the pH value of the crude nickel sulfate solution is less than or equal to 2; adjusting the pH value of the filtrate to 4-5, adding a sodium sulfide solution, and filtering to obtain a purified solution; conducting electrodeposition extraction on the purified liquid to obtain the nickel. The method for preparing electrodeposited nickel by using crude nickel sulfate is simple, and the crude nickel sulfate is purified to meet the requirement of electrodeposited nickel, so that high-grade metal nickel is obtained.

Description

technical field [0001] The invention belongs to the technical field of nickel sulfate refining, and in particular relates to a method for preparing nickel electrodeposition by utilizing crude nickel sulfate. Background technique [0002] During the copper electrorefining process, the nickel content in the copper electrolyte will be enriched with the continuous circulation of the electrolyte. When the nickel reaches a certain concentration, the method of concentrated crystallization is used to produce crude nickel sulfate. Crude nickel sulfate components: Ni 10-25%, Cu 0.1-2%, Fe 1-10%, As 0.1-2%, Pb 0.01-0.05%, Zn 1-10%. Due to the high content of copper, iron, zinc and other impurities in crude nickel sulfate, it cannot be used directly. Its export price is cheap, its added value is low, and the stockpiled inventory is large, which causes capital pressure, which will bring certain economic benefits to production enterprises. loss. The traditional processing method of crud...

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Problems solved by technology

Chemical precipitation method: the product is obtained by concentration and crystallization after sulfide precipitation, oxidative hydrolysis precipitation, and fluoride precipitation; the disadvantage of this method is that the removal rate of impurities is not high and it will cause a large loss of nickel, and it is easy to produce toxic gas, and the consumption of reagents is large. High sodium content in medium; solvent extraction: P 2 o 4 ,P 5 o 7 Wait for the extractant to remove impurities, and finally concentrate and crystallize to obtain the product; the disadvantage of this method is that the separation effect of the organic solvent and the water phase is not good, the removal rate of calcium and magnesium is low, and the volatilization of organic matter causes indoor air pollution; ion exchange method: ion exchange resin adsorption removal Impurities are finally concentrated and crystallized to obtain the product; the disadvantage of this method is that it has high requirements for raw material composition, poor adaptability of raw materials, easy clogging of resin, and low production efficiency; the process of refining nickel sulfate by the combined method of chemical precipitation and solvent extraction is relatively long, and various Ions are removed step by step, and the production efficiency is low

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