Production method of high-purity copper sulphate

Abstract

The invention discloses a production method of high-purity copper sulphate. The production method of high-purity copper sulphate comprises the following steps of: dissolving industrial grade copper sulphate into ultrapure water, heating to the temperature of 40-70 DEG C, dropwise adding sulphuric acid to regulate pH to be 1.0-2.0, stirring and dissolving, and then adding hydrogen peroxide; mixing polymeric ferric sulphate with basic copper carbonate in a mass ratio of 1: (2.5-4.5) to prepare a precipitation complexing agent, adding the precipitation complexing agent the weight of which is 0.5-2.5wt% of weight of the solution into the insulated solution, then adding activated carbon the weight of which is 0.5-2.5wt% of the weight of the solution, stirring for 3-7 hours, cooling to room temperature, and standing overnight; and carrying out rough filtration on the solution, then filtering with a microporous membrane with the size of 0.2mu m, and concentrating and crystallizing filtrate to obtain high-purity copper sulphate.

Description

technical field [0001] The invention relates to a method for producing high-purity copper sulfate. Background technique [0002] Copper sulfate, also known as bile alum, blue alum and copper alum, is mainly used as a mordant for printing and dyeing of cotton and silk fabrics, an insecticide, a water bactericide, and a wood preservative in traditional industrial fields, and it is also widely used in the preparation of Bordeaux mixture , electroplating copper, non-ferrous metal beneficiation (flotation) industry, ship paint industry and the manufacture of other chemical raw materials. With the rapid growth of high-tech electronic components, integrated circuits, printed circuit boards and related enterprises in China, the market demand for copper sulfate has increased significantly at an unprecedented speed, which also puts forward very strict requirements for product quality . Since industrial-grade copper sulfate inevitably contains different levels of organic impurities, ...

AI Technical Summary

Problems solved by technology

[0004] 1. Use the traditional process of purification, that is, use chemical oxidation to neutralize and hydrolyze iron, and then adjust the pH value to precipitate and remove iron ions and other metal impurities in the form of hydroxides, but the product quality of this method is not high. Generally can not meet the needs of the printed circuit board industry

[0005] 2. Use high-purity electrolytic copper as raw material for direct synthesis. According to reports, the U.S. Univertical Company uses high-purity electrolytic copper as raw material to produce high-purity copper salt with a total impurity content of less than 20ppm. Due to the rising price of high-purity electrolytic copper, The production line of copper salt produced from electrolytic copper is high in cost and expensive, and cannot meet the requirements of market competition

[0006] 3. It is obtained by using industrial-grade copper sulfate after repeated recrystallization and purification, but the product yield is low and energy consumption is high. The copper salt produced by recrystallization method is currently only used in the production of low-end electronic products, and the purity is difficult to achieve Quality requirements for high-end product processing in electronics manufacturing industry

This method has a low product conversion rate due to the removal of initially precipitated crystals

[0007] 4. Select a suitable extraction solution to extract copper ions with extraction-back extraction technology. For example, CN1835891 discloses a method for manufacturing high-purity copper sulfate, which dissolves crude copper sulfate crystals or copper alloys, and then carries out activated carbon treatment or solvent extraction and activated carbon Treatment, separation from other metal ions to achieve the purpose of purification, but this method is inefficient and cannot be applied to industrial production on a large scale

Images