Indirect regeneration for waste etching solution and recovery processing system for copper

Abstract

The invention relates to a cyclic regeneration technology for etching waste solution, in particular to a system for cyclic regeneration of the etching waste solution and recovery processing of copper. The etching waste solution generated by an etching machine and ammonia board-washing waste solution pass through an etching waste solution inlet in the system and respectively enter into a primary extraction cylinder and a secondary extraction cylinder; extracting agent in an extracting agent circulation cylinder passes through an extracting agent inlet and enters into the primary extraction cylinder and the secondary extraction cylinder; copper ions in the etching waste solution are extracted and separated by the extracting agent; the etching waste solution becomes regenerated etching solution and ammonia wash solution, passes through a regenerated solution outlet and enters into the etching solution regeneration system for respective composition preparation, and then an etching procedure and an ammonia board-washing procedure are performed. During the whole process of the system, closed cycle is realized; no waste water and waste gas are exhausted; the copper, the regenerated etching solution and the ammonia wash solution can be recovered high efficiently; the sewage discharge rate of the etching procedure is greatly reduced; the environmental protection pressure is reduced; moreover, the processing and running cost is reduced because three circulating systems can be operated continuously.

Description

[0001] Field of the invention: The utility model relates to the separation technology of liquid mixture, in particular to a recycling technology of waste etching solution. Background technique: [0002] As the foundation of the electronics industry, information industry and home appliance industry, the printed circuit board industry, one of the heavy polluting industries, has been transferred to China in the past 20 years, making China's printed circuit board industry maintain an annual growth rate of more than 10% in recent years At present, there are nearly 3,000 enterprises of various scales, with an annual output of 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 waste etching solution produced. Water resources in the area surrounding the PCB pose a serious hazard. Etching is a process that consumes a large amount of chemical water in the production of PCB (printed circuit ...

AI Technical Summary

Problems solved by technology

The copper sulfate process of decentralized transportation and centralized treatment not only wastes resources such as ammonia, chloride, thiourea, and chrome copper in the waste etching solution, but also has potential accidents in the waste liquid transportation. The water system and the surrounding environment have caused more serious secondary pollution. Although the treatment method is simple, it needs to consume a large amount of reagents, generate a large amount of washing wastewater, or the purity of the obtained product is not enough, and the etchant cannot be directly regenerated, so the economic benefit is low.

[0003] In China, there is also a method of directly electrolytically extracting copper in the alkaline system of the etching solution by using the ion membrane process for recycling and regeneration. Due to technical thinking problems and problems with the ion membrane and the cathode plate, the chlorine ions in the electrolyte react chemically with other components. , leading to difficulty in adjusting the components of the regenerated etching solution, poor production stability, double-sided and high-precision multilayer boards cannot be used, and highly toxic gas chlorine gas is generated during electrolysis. If it is too high, most of the produced copper will be powdered, with low purity, and the loss of ammonia volatilization is large, and the ammonia lotion cannot be recycled; in addition, the electrolytic copper needs to be manually extracted once or twice a day, resulting in high labor intensity and serious loss of ammonia, etc. question

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