| 摘要 |
<p>An extraction process for recovering precious metal and optionally valuable non-precious metal from base metal-containing material including recovery and reuse of a primary liquid reactant, which comprises treating the material with a primary liquid reactant capable of dissolving the base metal and optionally the non-precious metal but not the precious metal to a significant extent, forming a precious metal residue and a metal-containing used primary liquid reactant, separating the used primary liquid reactant from the residue, converting part of the used primary liquid reactant into a gaseous precursor for recycling and causing the precursor to contact liquid converting it to the primary liquid reactant, and treating the residue with a secondary liquid reactant to dissolve the precious metal. The precious metal may be gold, silver or a platinum group metal. The non-precious valuable metal may be cobalt, molybdenum, nickel, vanadium, tungsten, titanium, zirconium or manganese. The base metal may be iron, lead, copper, zinc or tin.</p> |
