Efficient method for extracting nickel sulfate from copper electrolysis waste liquid

Abstract

The invention discloses an efficient method for extracting nickel sulfate from copper electrolysis waste liquid. The method comprises the following steps of carrying out first-stage electrodeposition copper removal production to obtain electrodeposited copper, and carrying out vacuum evaporation concentration, water-cooling crystallization and filtration separation on first-stage electrodeposited liquid to obtain crude copper sulfate and crystallization mother liquor; and carrying out two-stage electrodeposition copper removal production on the crystallization mother liquor to obtain a copper removal plate and two-stage electrodeposited liquid, carrying out three-stage electrodeposition induced copper removal and impurity removal on the two-stage electrodeposited liquid to obtain a copper removal plate, copper removal powder and copper removal final liquid, and carrying out preheating, electric evaporator concentration, water pre-cooling, brine freezing crystallization and filtration on the copper removal final liquid to obtain the nickel sulfate. The nickel content in the prepared nickel sulfate can reach 26% or above, the product purity is high, the recovery rate can reach 90%, and the comprehensive economic benefit can be improved by 50% or above compared with an existing process.

Description

technical field [0001] The invention belongs to the technical field of copper electrolysis waste liquid treatment, and in particular relates to an efficient method for extracting nickel sulfate from copper electrolysis waste liquid. Background technique [0002] Electrolytic copper is a non-ferrous metal closely related to human beings. It is widely used in electrical, light industry, machinery manufacturing, construction industry, national defense industry and other fields. It is second only to aluminum in the consumption of non-ferrous metal materials in my country. Copper is the most widely used and used in the electrical and electronic industries, accounting for more than half of the total consumption. Used for various cables and wires, windings of motors and transformers, switches and printed circuit boards, etc. In the manufacture of machinery and transport vehicles, it is used to manufacture industrial valves and fittings, instruments, sliding bearings, molds, heat e...

AI Technical Summary

Problems solved by technology

The copper electrolysis process mainly includes processes such as anode processing, initial collection sheet production, electrolysis, liquid purification and anode slime treatment, among which the existing liquid purification process mainly uses vacuum evaporation-water cooling crystallization to produce crude copper sulfate and copper sulfate crystallization mother liquor to induce decontamination , Part of the copper removal final solution is returned to electrolysis, and part of the nickel sulfate system is concentrated by electric evaporation-water cooling crystallization to extract crude nickel sulfate production process, which has insufficient capacity of the nickel removal system, high energy consumption, and high failure rate of electric evaporation equipment, which affect the stable operation of production

Coupled with the concentrated entry of high-nickel raw materials in recent years, the nickel enrichment in the electrolyte has risen sharply to 15-16g / L, far exceeding the technical requirements, resulting in anode passivation, increased tank pressure, and increased power consumption during the electrolysis process, affecting products. quality, increase the unit processing cost of cathode copper and nickel sulfate

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