| 摘要 |
<p>PURPOSE:To recover copper oxide obtd. by treating waste liquor contg. copper as powdery metallic copper of high purity by putting a base metal in an aqueous sulfuric acid soln. contg. copper sulfate formed by reacting the copper oxide with sulfuric acid and by heating the soln. CONSTITUTION:Copper oxide obtd. by treating waste liquor such as a discharged copper plating bath of a pickling soln. used to pickle a copper wire is reacted with sulfuric acid while dissolving the oxide in an aqueous sulfuric acid soln. to form copper sulfate. An electrochemically base metal such as Fe, Al or Zn is put in the resulting aqueous sulfuric acid soln. contg. copper sulfate, and white fumes are generated from the soln. by boiling to deposit the copper sulfate as copper by reduction. Thus, powdery metallic copper of 99.90% high purity is obtd. Since empty Al cans or the like can be used as the metal for reduction, the running cost can be considerably reduced.</p> |
