| 摘要 |
A process of producing blue copper hydroxide, wherein copper metal is treated with an ammonium ion-containing aqueous solution with stirring and with a simultaneous introduction of an oxygen-containing gas and the reaction product is separated from the copper metal. A particulate, floatable copper (II) hydroxide is produced in that a material which contains copper metal is treated at a temperature of 0 DEG to 40 DEG with a solution which contains 0.1 to 10 g/l ammonium salt (calculated as NH4), 0 to 10 g/l ammonium hydroxide (calculated NH3) and, if desired, 0 to 5 g/l copper (II) salt and the resulting copper (II) hydroxide is separated.
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