Title: Process for extraction of noble metal from anode mud by method of controlling potential
Application Number: 85106670 Application Date: 1985.08.31
Publication Number: 1009335 Publication Date: 1987.03.11
Approval Pub. Date: Granted Pub. Date: 1989.03.08
International Classifi-cation: C22B7/00,C22B11/04
Applicant(s) Name: Kunming Noble Metal Inst., China Nonferrous Metal Address:
Inventor(s) Name: Ruan Mengling
Attorney & Agent: HE TONGPEI
Abstract:
     According to the process of the invention, first put the material into the medium HCL and NaCl, and ten NaCLO is put in above mentioned medium at 75-85 deg.C to control the redox potential of the system within the range of 400-460 mv under which conditions the noble metal is selectively leached out. The leached residue containing noble metal, according to its characteristics, is leached out again within the range of 600-650 mv; or after the leached residue having been solved, the noble metal in the solution is reduced and precipitated respectively, so that the crude metal having more than 95% purity and noble metal's concentrate ore are obtd. Its recovery ratio is more than 98%. The process of the invention is mainly used for separating of extracted, beneficiated and refined noble metal from the base metal in the smelting process of the noble metal.
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