Method for wet separation of mixed solution containing nickel and zinc

Abstract

The invention discloses a method for the wet separation of mixed solution containing nickel and zinc. The method comprises the following steps of: adding ammonia water or chlorhydric acid into the mixed solution containing the nickel and the zinc; adjusting the pH value of the solution to between 6.25 and 7.5; filtering the solution; and drying a filter cake to obtain a zinc deposit, wherein the filtrate is solution of nickel ammine. The method has strong process universality, is suitable for various mixed solution containing the nickel and the zinc, can control the process condition easily, has simple devices, easily realizes large-scale production, and has a low processing cost and significant economic benefits and social benefits.

Description

technical field

[0001] The invention relates to a wet separation method for a mixed solution containing nickel and zinc. Background technique

[0002] The common methods for separating nickel and zinc are: neutralization method, concentrated sulfuric acid crystallization method, sulfide precipitation, electrowinning method, solvent extraction and ion exchange method, hydrogen reduction method and alkali leaching method. Said method all has certain defectives:

[0003] 1) The neutralization method and concentrated sulfuric acid concentration crystallization method are not enough to effectively separate nickel and zinc.

[0004] 2) The electrowinning method is only suitable for removing trace amounts of nickel from zinc sulfate solution.

[0005] 3) Solvent extraction and ion exchange methods are commonly used in industry to purify zinc in nickel electrolysis anolyte, but these two methods are only suitable for separating trace zinc in nickel sulfate solution. Moreover, it ...