Preparation of highly pure copper oxide from waste etchant
AssigneeMyung Jin Chemical Co., Ltd.
InventorsKyu Bum Seo, Young Sun Uh, Young Hee Kim, Jung Yoon Han, Sun Jin Kim, Myung Hun Kim
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Abstract
A method for recycling copper oxide includes: a first step in which a sodium hydroxide aqueous solution is added to acidic copper chloride waste etchant produced in the PCB industry, to obtain copper hydroxide slurry; and a second step in which the slurry obtained in the first step is heated and sintered to thereby prepare a needle-form copper oxide. Since copper oxide has a purity of more than 99.0 wt % and the needle-form crystal morphology, so that it has an excellent filtering ability and homogeneous particle size distribution.
Claims3
A method for preparing copper oxide, comprising the following steps of:
- a) adding an aqueous sodium hydroxide solution to an acidic copper chloride waste etchant at a temperature of 10-30° C., to obtain copper hydroxide slurry;
- b) aging the obtained copper hydroxide slurry at a temperature of 50-100° C., to obtain copper oxide in needle form having a purity of more than 99.0 wt %;
- and
- c) sintering the obtained copper oxide at a temperature of 100-400° C.
Dependencies are inferred from the claim text.