SELECTIVE PRECIPITATION OF METAL SULFIDES

摘要

A method for recovering zinc ions by selective sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that pre cipitates as metal sulfide at a pH lower than a pH at which zinc ions precip itate as zinc sulfide, the method comprising contacting the aqueous solution with a source of sulfide to precipitate the metal ions as the metal sulfide while avoiding the precipitation of the zinc sulfide thereby yielding the m etal sulfide precipitate and a solution comprising zinc ions, and contacting the solution comprising zinc ions with a source of sulfide ion in a concent ration sufficient to precipitate the zinc ions as the zinc sulfide.