Invention Grant
- Patent Title: Precious metal recovery from solution
- Patent Title (中): 贵金属从溶液中回收
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Application No.: US12296159Application Date: 2007-04-05
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Publication No.: US07972413B2Publication Date: 2011-07-05
- Inventor: Chen Xia
- Applicant: Chen Xia
- Applicant Address: CN
- Assignee: Metal Asia International Ltd.
- Current Assignee: Metal Asia International Ltd.
- Current Assignee Address: CN
- Agency: Rader, Fishman & Grauer PLLC
- International Application: PCT/CA2007/000566 WO 20070405
- International Announcement: WO2007/115399 WO 20071018
- Main IPC: C22B3/06
- IPC: C22B3/06 ; C22B11/00

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.
Public/Granted literature
- US20100025259A1 Precious Metal Recovery from Solution Public/Granted day:2010-02-04
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