Method for preparing cupric sulphate by using cupric nitrate exhausted liquid

A technology of copper nitrate and copper sulfate, applied in directions such as copper sulfate, can solve the problems of inability to reduce the cost of discharge treatment, waste of resources, etc., and achieve the effects of increasing raw material procurement costs, saving energy, and reducing economic production costs

Inactive Publication Date: 2008-01-30
谢政龙
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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

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Embodiment approach

[0006] A kind of method that the present invention prepares copper sulfate with copper nitrate waste liquid, system will contain sulfuric acid (H 2 SO 4 ) Concentrated sulfuric acid between 50% and 98% is added to copper nitrate waste liquid Cu(NO 3 ) 2(aq) Inside, make it form a mixed aqueous solution of sulfuric acid and copper nitrate and react with each other (there will be a phenomenon of heating at this time). The chemical reaction formula is as follows:

[0007] Cu(NO 3 ) 2(aq) +H 2 SO 4 →CuSO 4 +2HNO 3

[0008] Next, the mixed aqueous solution of sulfuric acid and copper nitrate is heated to between 60°C and 120°C, so that the nitric acid (HNO 3 ) is vaporized and separated to form a purified copper sulfate aqueous solution; then the copper sulfate aqueous solution is cooled to 60°C to produce copper sulfate crystals, and finally the surface moisture in the crystalline copper sulfate is removed by dehydration to complete Prepare solid copper sulfate finished ...

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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...

Claims

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Application Information

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IPC IPC(8): C01G3/10
Inventor 谢政龙
Owner 谢政龙
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