Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Chen Xia0
Date of Patent
July 5, 2011
0Patent Application Number
122961590
Date Filed
April 5, 2007
0Patent Primary Examiner
Patent abstract
A method for recovering precious metals such as gold and silver from aqueous solution as solid is described The method includes mixing an aqueous solution (e.g, thiosulfate or thiocyanate lixiviant) containing precious metals with ferrous ions in the presence of an effective amount of hydroxide ions. The precious metal ions are reduced and co-precipitate with iron hydroxides and/or hydrated iron oxides The co-precipitate is collected and purified. De-oxygenation of the reaction solution is optional. The recover/method is fast, complete and clean.
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