Method for preparing cupric sulphate by using cupric nitrate exhausted liquid

Abstract

The invention relates to a method of preparation of copper sulfate with cupric nitrate waste solution, aiming at recycling cupric nitrate waste solution from manufacturing process of PCB and making the cupric nitrate waste solution as raw materials of solid copper sulfate. Concentrated sulfuric acid is first added into the cupric nitrate waste solution and forms a mixed solution of the sulfuric acid and the cupric nitrate and the sulfuric acid and the cupric nitrate react to each other chemically therein; then the mixed solution of the sulfuric acid and the cupric nitrate is heated to vaporize and separate HNO3 and the other solution is cooled then to generate copper sulfate crystal containing water or moisture; finally solid copper sulfate powder in a gain shape can be obtained after the crystal is dehydrated. The invention not only can completely recycle cupric nitrate solution and avoid secondary pollution, but also can directly get cheap or free raw material for preparing copper sulfate, thereby reducing economic production cost.

Description

【Technical field】 [0001] The present invention provides a method for preparing copper sulfate with copper nitrate waste liquid, in particular refers to the recycling of copper nitrate waste liquid discharged in the production process of printed circuit board factories to form raw materials for preparing copper sulfate, so as to meet the requirements of environmental protection and waste reduction in production. And then obtain the economic production benefit of effective reuse. 【Background technique】 [0002] At present, in the production process of all printed circuit boards (PCB), various acidic copper-containing waste liquids will be discharged, such as: waste copper sulfate aqueous solution, waste copper nitrate aqueous solution, waste copper chloride aqueous solution, etc.; among them, the The waste copper nitrate aqueous solution is all mixed into other metal waste liquids for discharge treatment together, and the conventional technology adopted for the treatment or re...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of all printed circuit boards (PCB), various acidic copper-containing waste liquids will be discharged, such as: waste copper sulfate aqueous solution, waste copper nitrate aqueous solution, waste copper chloride aqueous solution, etc.; among them, the The waste copper nitrate aqueous solution is all mixed into other metal waste liquids for discharge treatment together, and the conventional technology adopted for the treatment or reuse of these mixed metal waste liquids is as the announcement number No. 212787, U.S. US5019273 and German DE4209180 and other methods; only, from the method disclosed above, the copper nitrate waste liquid is not separated separately for processing, so that the cost of the whole discharge treatment cannot be reduced, and the copper metal and nitric acid solution in the original metal waste liquid Other useful substances are also disposed of due to discharge, resulting in a waste of resources that cannot be reused