| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for recovering metals which is capable of easily separating even waste materials, such as grinding swarf, polishing swarf of Cu-W and Ma alloys mingled with abrasive gains, easily separating and recovering Cu and W, Mo with good purity, and drastically reducing a recovering cost, is cost effective, is capable of recovering Cu and W, Mo without requiring a general long refining stage for W and Mo and allows industrialization with simple equipment without requiring acid resistant devices, pollution control equipment, etc. SOLUTION: This method has a dissolution stage for obtaining an aq. soln. by dissolving the waste materials contg. at least one kind among the Cu-W composite materials and the Cu-Mo composite materials in a solvent soln. and a precipitation stage for precipitating Cu, Mo or W from the aq. soln. The dissolution stage dissolves the waste materials by using an ammonia soln. contg. bivalent Cu ammonia complex ions as the solvent soln. in the state that oxygen is sufficiently supplied to the ammonia soln.</p> |
