Two commonly employed processes-neutralizing deposition and solvent extraction are compared for demonstrating the research progresses in comprehensive utilization of waste etching solution containing copper in order to carry out cycle production with zero-discharge.

Basic copper carbonate can be prepared from waste etching solution containing copper.

The new method of producing basic copper carbonate from waste etching solution containing copper.

Recovery of copper from spent etching solution by Lix54-100 extractant;

The earliest domestic originated zero emission clean production process for mass centralized resource utilization of circuit board spent etching solution developed by Nanxi Chemical Plant,Baiyun District of Guangzhou was studied and three key technical conditions were optimized by orthogonal experiment including weight of mixed quicklime of 0.

Factors that may influence copper recovery rate including pH, temperature and cuprous ion concentration were studied when using neutralization process to recover copper from spent etching solution, and options to choose the best conditions for precipitating copper were optimized.

Research Status and Prospects for spent etching solution

There are two different typical treatment technologies in PCB spent etching solution in China now-cyclic regeneration end producing copper sulfate,In the paper,the technology process,resource utilization and environment infection are compared and analyzed between them.

Nanometer copper powders were prepared from acidic waste etching solution containing copper using hydrazine hydrate as a reductive agent.