| 摘要 |
<p>A novel method is proposed for concurrently producing a metallic copper powder and a valuable chloride of a metal other than copper, e.g., manganese, zinc, cobalt, nickel and tin, from a depleted aqueous etching solution containing copper (II) chloride as discharged from the etching process in the manufacture of copper-foiled printed circuit boards. The inventive method also contributes to solve the problem for the disposal of such a waste solution without causing the troubles in connection with environmental pollution. The inventive method comprises the steps of: treating the waste solution with an active carbon so as to remove organic impurities; admixing the solution with a powder, granules or flakes of the above mentioned metal so as to precipitate the copper value in the metallic form, instead, giving an aqueous solution of the chloride of the added metal; and separating the copper metal powder and the chloride solution.</p> |
