Preparation method for electro-deposited nickel and cobalt

Abstract

The invention provides a preparation method for electro-deposited nickel and cobalt. According to the preparation method, ferrous sulfate or iron pyrite or zinc sulfide or nickel-cobalt sulfide serves as a reducing agent, and nickel-cobalt hydroxide is soaked completely through one step; then neutralizing and deironing are conducted through the nickel-cobalt hydroxide, silicon and aluminum are removed through neutralization by means of magnesium oxide, leaching residues are washed for recycling nickel and cobalt, P2O4 / 5O7 is removed out of a filtered solution, and saponification, extraction and impurity removal are conducted; and nickel is deposited by means of the P2O4 / 507 through electro-deposited nickel anolyte and industrial grade light-roasted powder or magnesium oxide, nickel hydroxide directly reacts with P2O4 or P5O7 for producing nickel soaps, and a P5O7 / 2O4 extraction solution is used for conducting electrodeposition on nickel or cobalt or conducting evaporative crystallization for producing the electro-deposited nickel or electro-deposited cobalt. A back extraction solution is used for producing manganese sulfate monohydrate and electro-deposited zinc. An anolyte nickel deposition post-solution is used for producing magnesium sulfate heptahydrate through evaporation. By the adoption of the preparation method, the P2O4 nickel soaps and the P5O7 soaps which meet scale production can be obtained, the production cost of the electro-deposited nickel and cobalt is substantially reduced, the problem that anolyte volume expansion is solved, and corrosion of anolyte evaporation to equipment is eradicated; and zero emission of production waste water of the electro-deposited nickel and cobalt is achieved, and environment protection and comprehensive resource utilization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of saponification extraction process in nonferrous metal wet smelting, and specifically relates to a method for producing electrolytic nickel and cobalt by using nickel cobalt hydroxide. Background technique [0002] At present, my country mainly uses P 2 0 4 Extract the crude nickel sulfate to remove impurities, and if necessary, pass through P 5 0 7 Nickel and cobalt are separated to obtain qualified electrolytic nickel catholyte. Before use, P 2 0 4 and P 5 0 7 The extractant is saponified first. The traditional saponification process is completed in two steps: the first step is the reaction of the extractant with sodium hydroxide, the extractant releases the H+ on the hydroxyl group, ion exchange occurs with Na+, the extractant becomes sodium form, H+ and OH- are neutralized, and the second step The two-step sodium-type extractant reacts with nickel sulfate, Na+ and Ni2+ undergo ion exchange, an...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above existing problems, the present invention discloses a preparation method of electrodeposited nickel and cobalt, which adopts the direct reaction of extractant and nickel hydroxide to realize nickel soap in one step; , to solve the problem of volume expansion of the anolyte at low cost while obtaining the alkaline raw materials required for saponification