Method for recycling acidic copper-etching waste solution

Abstract

The invention discloses a method for recycling acidic copper-etching waste solution. The method comprises the following steps of: step 1, recovering copper form the acidic copper-etching waste solution, filling the acidic copper-etching waste solution in a reaction kettle, adding reduced iron while stirring so as to replace copper ions in the etching solution and separate out spongy copper, and performing solid-liquid separation treatment so as to obtain a spongy copper product having a water content of 50% and the solution containing lots of ferrous ions after the replacement; and step 2, preparing ferric trichloride from the solution after copper extraction: adjusting the solution according to the ferrous ion content and the pH value of the ferrum-containing solution after the replacement in the step 1, and then charging chlorine and reacting the ferrous ions with the chlorine to generate ferric ions, so as to prepare an effluent treatment agent, namely, ferric trichloride. The method disclosed by the invention is short in production flow, simple in process, low in energy consumption, wide in adaptability, capable of reutilizing all the remainder effective cost of the waste solution after the copper extraction while effectively extracting copper powder in the etching waste solution, and capable of realizing zero-discharge of the acidic etching waste solution of a printer circuit board and effectively protecting environment.

Description

technical field [0001] The invention belongs to the field of comprehensive resource utilization of industrial hazardous waste, and relates to a method for recycling and reusing acidic copper etching waste liquid. Copper powder is produced, and then the remaining waste liquid is prepared into ferric chloride water purifying agent. Background technique [0002] The IT industry is an important pillar industry in my country. However, with the vigorous rise of the IT industry, a large amount of toxic and harmful industrial wastewater has been generated. Improper treatment can easily threaten and endanger the surrounding ecological environment. Among them, PCB acidic etching waste liquid has great potential for recovery. Useful hazardous waste. PCB acidic etching waste liquid mainly contains copper salts, free acids and oxidants, etc. These components have great recycling value as resources, but they are high-concentration hazardous wastes as pollutants, which require high treatme...

AI Technical Summary

Problems solved by technology

Although the polyferric chloride flocculant prepared by the above method has achieved good results in application, there are many kinds of raw materials required in the production process, and the production process is complicated. In addition, due to the difference in the composition of PCB acidic etching waste liquid, the above method does not It is not suitable to use the acidic etching waste liquid after the traditional method of copper extraction or electrolysis for the preparation of polyferric chloride

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