Method for deeply removing copper from nickle electrolysis anode solution by using ion exchange resin

Abstract

The invention discloses a method for deeply removing copper from a nickle electrolysis anode solution by using ion exchange resin. The method comprises the following steps: chelating ion exchange resin is used for carrying out multi-stage counter current absorption on the nickle electrolysis anode solution, the concentration of Cu in the nickel solution is reduced to be 40 mg / L or below, filtering is performed, a low-concentration acid solution is used for washing resin, Ni physically carried or chemically absorbed is removed, and then an acid solution is used for desorbing so as to obtain a copper solution with the Cu / Ni ratio of larger than 20; dynamic adsorption is performed on the nickel solution with the Cu content lower than 40 mg / L, the flow rate and the temperature of the solution are controlled, and therefore, the nickel solution with the Cu content lower than 3 mg / L is obtained. According to the method provided by the invention, the ratio of Cu / Ni loaded in the resin is high and reaches 30 or above, production of copper slag can be avoided, and no-slag copper removal can be achieved. The method provided by the invention has the advantages of high copper removing degree, simple process, zero impurity introduction, low cost, and zero waste gas and waste residue discharge, and has significant economic benefits and an environmental value.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for deeply removing copper from nickel electrolysis anolyte by using ion exchange resin. Background technique [0002] Nickel is widely used in various aspects of national economy and national defense construction, and is an important strategic resource. Nickel products have high requirements on impurity content, especially for impurity copper content. For example, my country's electrolytic nickel standard (GB6516-2010) stipulates that in Ni9990, the Cu content is not more than 0.02%, and in Ni9999, the Cu content is not more than 0.0015%. . Nickel metal is mainly produced by electrolysis. During the electrolysis process, copper ions in the electrolyte will be precipitated prior to nickel, which will affect the quality of electrolytic nickel. Therefore, the nickel electrolyte must be deeply copper-removed before electrolysis. [0003] The removal methods of copp...

AI Technical Summary

Problems solved by technology

Too small leakage volume and high Cu concentration in the effluent mean that this technology cannot meet the requirements of industrial applications

[0016] Therefore, this type of method of directly adopting ion exchange columns to separate copper and nickel is only suitable for use when the copper content in the nickel electrolyte is extremely low, and is especially suitable for preparing high-purity or ultra-high-purity nickel by nickel electrolytic anode copper removal standard solution, and for Not suitable for deep removal of copper in industrial nickel electrolysis anolyte with copper content up to 500mg / L