Technology for recycling nickel sulfate from nickel slag

Abstract

The invention belongs to the technical field of resource recycling, and particularly relates to a technology for recycling nickel sulfate from nickel slag. The nickel slag is crushed into powder through a crusher; the powder is dissolved by adding a sulfuric acid solution, and filter liquor A is obtained through filtering after stirring; the obtained filter liquor A is cooled and crystallized, crude nickel sulfate crystals and mother liquor A are obtained, then pure water is used for dissolving the crude nickel sulfate crystals, and a solution B is obtained; hydrogen peroxide is added in the solution B or the solution B is inflated with oxygen, a sodium hydroxide solution is added for pH adjustment, sediments are removed through filtering, and a pure nickel sulfate solution is obtained; and the pure nickel sulfate solution is recrystallized, and nickel sulfate crystals and mother liquor B are obtained. The technology solves the problem of the reaction of excessive sulfuric acid and alkali, a large number of resources are saved, economic benefits are obvious, and environment pollution is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of resource recovery and utilization, and in particular relates to a process for recovering nickel sulfate from nickel slag. Background technique [0002] In recent years, with the continuous development of the electronics industry, electronic special gas tungsten hexafluoride (WF 6 ) demand has been increasing year after year, and solid nickel waste is produced in the production process, which also brings problems such as heavy metal pollution and resource recycling. [0003] In the existing process of adding alkali to remove impurities by using nickel-containing waste residue to generate crystals such as nickel sulfate, the sulfuric acid in the acidolysis solution is excessive, and neutralization reaction must first occur when adding alkali to remove impurities, so that sulfuric acid and alkali cause a large At the same time, a large amount of waste liquid is produced, which pollutes the environment. [...

AI Technical Summary

Problems solved by technology

[0003] In the existing process of adding alkali to remove impurities by using nickel-containing waste residue to generate crystals such as nickel sulfate, the sulfuric acid in the acidolysis solution is excessive, and neutralization reaction must first occur when adding alkali to remove impurities, so that sulfuric acid and alkali cause a large At the same time, a large amount of waste liquid is produced, which pollutes the environment

[0004] CN 103922428 A discloses a regeneration treatment method for nickel-containing waste. In the method, it is mentioned that the molar ratio of the nickel catalyst to the substance in the sulfuric acid solution is 1:1 to 1.5, which enables the nickel catalyst to react better, but adding Resources are wasted in the alkali removal process, and a large amount of waste liquid is produced at the same time, polluting the environment

[0005] CN 102923795 A discloses a method for preparing nickel sulfate. In this method, it is mentioned that the amount of sulfuric acid added is 1.5 to 2.5 times the theoretical value. Although this process achieves the purpose of fully dissolving the nickel raw material, it is also due to the neutralization reaction. The reason is that a large amount of acid and alkali is consumed, and the mother liquor cannot be recycled, resulting in a large amount of waste liquid, which pollutes the environment