Method for preparing high-purity copper oxide by adopting acidic etching waste liquor

Abstract

The invention discloses a method for preparing high-purity copper oxide by adopting acidic etching waste liquor, comprising the following steps of: (1) injecting acidic copper chloride etching waste liquor into 30-35% (by weight) sodium hydroxide solution at the temperature of 40-60 DEG C to generate copper oxide; (2) cleaning the copper oxide; (3) drying and sintering the copper oxide at 100-300 DEG C to obtain acicular crystal copper oxide with purity higher than 99.0%; and (4) mixing and heating a neutralization solution generated from the step (1) and a cleaning solution generated from the step (3), and evaporating and crystallizing to obtain industrial salt and distilled water. The method can be used for effectively recovering the copper contained in the acidic copper chloride etching waste liquor to generate the high-precision copper oxide, and the neutralization solution and the cleaning solution can be heated, evaporated and crystallized to form the industrial salt and the distilled water, therefore, the method realizes the zero draining of waste water and has very good environmental-friendly effect.

Description

technical field [0001] The invention relates to a method for recycling waste liquid, in particular to a method for preparing high-purity copper oxide by using acidic etching waste liquid. Background technique [0002] At present, the production of printed boards has formed a large-scale industry in my country, with an annual output of 200 million m 2 , The production of printed boards produces a large amount of etching waste liquid. The printed board etching liquids mainly include alkaline etching liquid and acidic etching liquid. The total amount of copper contained in the etching waste liquid is about 50,000 tons per year. These etching waste liquids have the characteristics of various types, high toxicity, and strong corrosiveness. They belong to the national first-class hazardous waste. If they are discharged without treatment, they will cause extremely serious damage to the ecology, and even seriously threaten people's lives. If a large amount of waste liquid cannot be...

AI Technical Summary

Problems solved by technology

The disadvantage is that the produced copper hydroxide is viscous and gelatinous, difficult to stir and conduct heat (uneven temperature rise), so the acidic etching waste liquid needs to be diluted before it can be operated.

However, after dilution, the volume increases, and the salt content of the neutralization solution is greatly reduced. If the evaporation crystallization is to achieve the goal of zero discharge of wastewater, the cost needs to increase several times.

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