| 摘要 |
<p>PURPOSE:To dissolve zinc at a high rate and to efficiently recover zinc by bringing a metallic zinc-contg. material into contact with aq. ammonia, etc., and blowing oxygen into the soln. in the presence of an ammine copper complex to selectively dissolve zinc which is recovered. CONSTITUTION:A zinc-contg. material is brought into contact with an aq. soln. contg. ammonia and ammonium carbonate. In this case, an oxygen-contg. gas is blown into the soln. in the presence of an ammine copper (II) complex to selectively dissolve zinc into the soln. as an ammine zinc complex. Metallic zinc is added to the soln., and the precipitate is separated to provide a refined aq. soln. The ammine zinc complex in the soln. is then decomposed to precipitate basic zinc carbonate, and high-purity zinc is recovered.</p> |
