Patent ID: 7351343

Claim:
A copper metal recovery process, integrated with a wastewater treatment system of a circuit board manufacture plant, comprising: a decomposition step of charging from an exit of the wastewater treatment system of the circuit board plant more than 2 parts of weight of acidic copper-containing etching process effluent, less than 1 part of weight of copper-containing slurry, and less than 1 part of weight of waste mixture of acidic copper-containing photolithography effluent and acidic frame etching effluent into a stirring unit to obtain decomposition products, wherein the acidic copper-containing etching process effluent, the copper-containing slurry and the waste mixture discharged from the exit of the wastewater treatment system are used as a stock to be treated, the decomposition step includes the decomposition of polymers contained in the copper-containing slurry by acids in the acidic effluents, and the decomposition products includes a decomposition suspension containing suspended particles and copper ions; a crystallization step utilizing a temperature of at least 80° C. and a pH not smaller than 9 of reacting alkaline hydroxide with the decomposition products to obtain a crystallization solution; and a pressure filtering step of pressure filtering the crystallization solution to obtain a solid including copper oxide or hydroxide and filtrate.