Method of preparing nickel salt from nickel-contained mixed acid waste liquid

Abstract

The invention discloses a preparing method of nickel salt (NiSO4 or NiCl2) through waste liquid with compound nickel acid, which comprises the following steps: removing impurity ion such as Cu2+, Co2+, Fe2+, Ca2+ and Mg2+ in the waste liquid; extracting through P2O4; adding metal nickel in the organic phase; draining the extracting phase; adopting acid to proceed back extraction for organic phase; transmitting nickel into clear nickel salt; evaporating; crystallizing to produce metal nickel salt.

Description

technical field [0001] A method for preparing nickel salt with nickel-containing mixed acid waste liquid, relates to a method for preparing a single nickel salt solution (NiSO 4 or NiCl 2 )Methods. Background technique [0002] In the production process of metal nickel, nickel-containing mixed acid waste liquid usually contains Cu 2+ 、Co 2+ , Fe 2+ 、Na + , Ca 2+ , Mg 2+ and other impurity ions. In the production of pure metals by electrolysis or electrowinning, only Cu needs to be removed 2+ 、Co 2+ , Fe 2+ and other impurity ions; and when producing metal nickel salt products, usually the above-mentioned impurities in the solution are first removed, then precipitated as solid nickel carbonate with carbonate solution, and then washed with pure dilute acid solution (such as H 2 SO 4 , HCl, etc.) is dissolved and transformed into a nickel salt solution of a single acid, and then produced into a metal nickel salt through processes such as evaporation and crystallizat...

AI Technical Summary

Problems solved by technology

In the production of pure metals by electrolysis or electrowinning, only Cu needs to be removed 2+ 、Co 2+ , Fe 2+ and other impurity ions; and when producing metal nickel salt products, usually the above-mentioned impurities in the solution are first removed, then precipitated as solid nickel carbonate with carbonate solution, and then washed with pure dilute acid solution (such as H 2 SO 4 , HCl, etc.) is dissolved and transformed into a single acid nickel salt solution, and then produced into a metal nickel salt through evaporation crystallization and other processes. The process is complicated and the process is long