Etching liquid recycling process

Abstract

The invention relates to the field of etching liquid recycling, in particular to an etching liquid recycling process. The etching liquid recycling process comprises the following steps that one time of hydrogen peroxide treatment is carried out on acidic copper-containing etching waste liquid, acid-base neutralization and filter pressing are performed on the acidic copper-containing etching wasteliquid and alkaline copper-containing etching waste liquid, and a filter cake and filtrate are generated; and the filter cake is subjected to pulping, then 98% sulfuric acid is added, copper sulfate,water and hydrochloric acid are generated, centrifugal dewatering treatment is carried out after the copper sulfate is crystallized, copper sulfate pentahydrate and copper sulfate mother liquor are produced, the filtrate is precipitated and transported to an ion exchange tank for ion exchange, waste liquid is transported to a mixing tank, an appropriate number of solid materials are added to be stirred for sufficient mixing and dissolving, and etching son liquid and solder stripping liquid are pumped into storage tanks after production is finished. By means of the process, copper ions in the copper-containing etching waste liquid can be efficiently displaced through the steps of ion exchange, oxidation aeration and ion exchange, a regenerated etching solution is prepared, meanwhile, by-products, namely the copper sulfate pentahydrate can be generated, and the very high economic value is achieved.

Description

technical field [0001] The invention relates to the field of etching liquid recovery, in particular to an etching liquid recycling process. Background technique [0002] The printed circuit board (PCB) industry is the foundation of the electronics industry, information industry and home appliance industry. In the past 20 years, the PCB industry, one of the heavily polluting industries, has been transferred to China, making China's PCB industry have remained higher than 10% annual growth rate. At present, there are nearly 3,000 PCB companies of various sizes in the country, with an annual output of more than 200 million square meters, an annual consumption of refined copper of more than 100,000 tons, and a total copper content of more than 50,000 tons of etching waste liquid produced. my country's environment, especially the water resource environment in the surrounding areas of PCB factories, poses a serious threat and hazard. The etching production line is a process that c...

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Problems solved by technology

[0005] The system disclosed in this patent is capable of recovering chlorine and copper, but the reaction results in the formation of copper chloride, which has little economic value and generally lower economic results

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