Preparation of highly pure copper oxide from waste etchant
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United States of America Patent
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Nov 18, 2003
Grant Date -
Dec 13, 2001
app pub date -
Jan 24, 2001
filing date -
May 30, 2000
priority date (Note) -
Expired
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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.
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