Method for deeply removing copper in hydrochloric acid leaching solution of cobalt nickel hydroxide

Abstract

The invention discloses a method for deeply removing copper in a hydrochloric acid leaching solution of cobalt nickel hydroxide. The method mainly comprises the following technological steps: (1) leaching cobalt nickel hydroxide with hydrochloric acid to obtain a hydrochloric acid leaching solution, and adding diluted sulfuric acid to the hydrochloric acid leaching solution to regulate sulfate radical so that the content of the sulfate radical in the solution is 25-35g / L, wherein the solution serves as a precursor extracting solution; (2) adding the cobalt nickel hydroxide raw material to the precursor extracting solution to regulate pH value, wherein the addition of the cobalt nickel hydroxide is controlled until the final pH value of the solution is 4.0-4.5, and then carrying out filter pressing on the precursor extracting solution to obtain solid impurities; and (3) pumping the filter-pressed precursor extracting solution and a saponified P507 extracting agent to an extraction box for conducting countercurrent extraction. The method disclosed by the invention is obvious in copper removal effect; the content of copper ions in the nickel chloride solution is reduced to less than 0.004g / L after copper removal, so as to effectively meet a demand of producing an electroplating-grade nickel chloride product; and in addition, the method disclosed by the invention is simple to operate and easy in industrial production.

Description

technical field [0001] The invention belongs to the technical field of nonferrous hydrometallurgy, and relates to a method for deeply removing copper from nickel hydroxide cobalt hydrochloric acid leaching solution. Background technique [0002] Due to the depletion of sulfide nickel ore resources, laterite nickel ore has become the main resource of nickel raw materials due to its large reserves and easy mining. Nickel hydroxide and cobalt raw materials produced by the transformation of laterite nickel ore are gradually becoming the main raw materials for nickel salt production enterprises to produce nickel salt products because the price is lower than that of nickel raw materials produced by nickel sulfide ore. And in the method for producing nickel chloride solution, the hydrochloric acid leaching nickel hydroxide cobalt is the method that mainly adopts at present, but because the impurity content such as cobalt, magnesium, manganese, copper in the nickel hydroxide cobalt ...

AI Technical Summary

Problems solved by technology

The chemical precipitation method uses the copper precipitation agent to form an insoluble salt with copper, and the copper is separated after filtration; the extraction method uses an extractant to separate copper ions. The most commonly used copper extractant in the hydrochloric acid system is N 235 , N 235 As an anion extractant, it can only extract and separate metal ions that can form chloride anions, such as copper, iron, cobalt, zinc, etc., and its scope of application is greatly limited

Especially when the content of calcium, magnesium and manganese in hydrochloric acid system is high, N 235 Extraction can no longer meet the requirements of subsequent processes

P 507 The extractant can extract a variety of metal ions, and the separation of valuable metals can be achieved by controlling different conditions. However, in the hydrochloric acid system, deep copper removal cannot be achieved only by adjusting the pH value, flow rate, and phase ratio.