Precious metal recovery from solution

Details Precious metal recovery from solution Precious metal recovery from solution

2011-07-05

2011-07-05

Wyszomierski, George (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C075S741000

Reexamination Certificate

active

07972413

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.

REFERENCES:
patent: 4023961 (1977-05-01), Douglas et al.
patent: 4070182 (1978-01-01), Genik-Sas-Berezowsky et al.
patent: 4167481 (1979-09-01), Cremers et al.
patent: 4269622 (1981-05-01), Kerley
patent: 4369061 (1983-01-01), Kerley
patent: 4654078 (1987-03-01), Perez et al.
patent: 4654703 (1987-03-01), Viera
patent: 4913730 (1990-04-01), Deschenes et al.
patent: 5279803 (1994-01-01), Clough
patent: 5354359 (1994-10-01), Wan et al.
patent: 5389262 (1995-02-01), Guess
patent: 5536297 (1996-07-01), Marchbank et al.
patent: 5785736 (1998-07-01), Thomas et al.
patent: 5916534 (1999-06-01), Butler
patent: 6344068 (2002-02-01), Fleming et al.
patent: 6500231 (2002-12-01), Wan
patent: 6632264 (2003-10-01), Zhang et al.
patent: 6660059 (2003-12-01), Ji et al.
patent: 7004326 (2006-02-01), Dai et al.
patent: 2003/0154822 (2003-08-01), Hall et al.
patent: 2004/0115108 (2004-06-01), Hackl et al.
patent: 2004/0200207 (2004-10-01), McKelvey et al.
patent: 2004/0206207 (2004-10-01), Ji et al.
patent: 2004/0237721 (2004-12-01), Baghalha
patent: 2007/0014709 (2007-01-01), Moyes et al.
patent: 2010/0116092 (2010-05-01), Xia et al.
patent: 1818098 (2006-08-01), None
patent: WO2005/017215 (2005-02-01), None
patent: WO2007/098603 (2007-09-01), None
Aylmore and Muir, “Thiosulfate leaching of gold: A review”, Minerals Engineering, 14(2): 135-174 (2001).
Fleming, C.A., et al., “Recent advances in the development of an alternative . . . resin in pulp”, Minerals & Metallurgical Processing, 20(1): 1-9 (2003).
Klut, “The recovery of gold, silver and platinum residues”, Pharmazeutische Zeitung, 52:168 (1907)—English abstract.
Klut, “The recovery of gold, silver and platinum residues”, Pharmazeutische Zeitung, 52:168 (1907)—English translation.
Klut, “The recovery of gold, silver and platinum residues”, Pharmazeutische Zeitung, 52:168 (1907)—German paper.
Muir, D.M., et al., “Thiosulfate as an alternative to cyanide . . . impediments”, Mineral Pro. & Extractive Metallurgy (Trans. Inst. Min. Metall. C), 113: C2-C12 (Mar. 2004).
Nicol, M., et al., “Recovery of gold from thiosulfate solutions and . . . resins”, Cyanide: social, industrial and economic aspects, TMS, Warrendale, PA, 469-483 (2001).
Stanley, Norm, “Make your own chemicals: Recovery of gold”, www.sas.org/E-Bulletin/2003-10-31/labNotes2/body.html, (2003).
Wassink, B., et al., “Leaching of a gold ore using the hydrogen sulfide-bisulfide-sulfur system”, Met.Soc. CIM, Alberta: 225-241 (2005).
West-Sells, P.G., et al., “A novel thiosulfate leach process for the treatment of carbonaceous gold ores”, Met.Soc. CIM, Alberta: 209-223 (2005).
Xia, C., et al., “Iron sulfide minerals in thiosulfate-gold leaching: some problems and solutions”, Met.Soc. CIM, Alberta: 259-278 (2005).
Zhang, H., et al., “An electrochemical study of an alternative process . . . thiosulfate solutions”, Met.Soc. CIM, Alberta: 243-257 (2005).
International Search Report for corresponding PCT/CA2007/000566, Sep. 3, 2008.
Written Opinion of International Searching Authority for corresponding PCT/CA2007/000566 Sep. 3, 2008.
International Search Report for PCT/CA2007/000337 (Xia, et al.) Sep. 3, 2008.
International Perliminary Report on Patentability for PCT/CA2007/000337 (Xia, et al.), Sep. 3, 2008.

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