Method for preparing Big size particle and Easy soluble ultra pure copper oxide from waste etchant

摘要

invention PCB etching processes in the generation of acid etching waste liquid and waste liquid used for the alkali etching to the high-purity copper oxide relates to a process for preparing the plating dissolution rate is very quick and removal of impurities from the bath can be done completely, and it is possible to obtain a high-purity copper oxide that consists of large particles with excellent flowability second not contain fine particles. The present invention includes a first step to obtain a copper oxide and the first intermediate dehydration product from alkali etching waste liquid; Copper oxide second phase to the first intermediate dehydration product was dissolved in an acidic copper oxide etch waste solution to obtain a second intermediate; And a third step of generating an initial solution of soda ash and copper oxide copper oxide which acts as an intermediate nucleation nucleation incorporating a second intermediate; Determining the nuclear copper oxide intermediate solution, and the fourth step was added to the second solution of soda ash and acid etching waste fluid at the same time to form a copper oxide intermediate of the large particles; To precipitate the copper oxide intermediate of the large particles, in the sixth step, eluting / removal of impurities and dehydration using ultrasound; And a seventh step of vacuum drying and firing at a predetermined temperature; By using an ultrasonic eighth step of removing the impurities remaining in the particles eluted therein;. Is characterized by comprising a ;