| 摘要 |
A method for preparing high-purity copper oxide from a waste etchant is provided to produce a porous copper oxide, in a simple manner, that contains a trace amount of chlorine and has high purity and excellent solubility in an acid. A method for preparing high-purity copper oxide containing a trace amount of chlorine from a waste etchant includes the steps of: (1) adding hydrogen peroxide to the waste etchant to oxidize Cu^(1+) ions into Cu^(2+) ions; (2) heating a sodium carbonate solution to 80-90 °C, keeping the temperature(80-90 °C) until the completion of the reaction, adding the resultant waste etchant of the step (1) to the sodium carbonate solution until pH attains a value between 7.5 and 8.0, aging the resultant for 10-20 minutes to produce an intermediate containing basic copper carbonate particles and copper oxide particles; (3) filtering, washing, and dehydrating the reaction solution, heating the resultant to 300-400 °C in an air supply condition to convert the basic copper carbonate particles into copper oxide particles; and (4) eluting the converted copper oxide particles with water to remove residual chlorine compounds. Further, a concentration of the sodium carbonate solution is 15 to 17 %(w/v).
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