Invention Grant
- Patent Title: Method for leaching gold
- Patent Title (中): 浸金方法
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Application No.: US11896747Application Date: 2007-09-05
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Publication No.: US07682420B2Publication Date: 2010-03-23
- Inventor: Yoshifumi Abe , Hiroshi Hosaka
- Applicant: Yoshifumi Abe , Hiroshi Hosaka
- Applicant Address: JP Tokyo
- Assignee: Nippon Mining & Metals Co., Ltd.
- Current Assignee: Nippon Mining & Metals Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2006-264423 20060928
- Main IPC: C22B11/06
- IPC: C22B11/06

Abstract:
In a method for leaching gold from copper sulfides, the sulfide ores are first subjected to leaching of copper, thereby producing a leaching residue having 7.9% or less of the copper content. This leaching residue is mixed with a leach liquor, which contains the chloride ion and ferric ion and has 1.9 or less of pH. Gold and copper can be effectively leached from the copper sulfide ores. Ordinarily used oxidizing reagents such as hydrogen peroxide or nitric acid are not used. The gold, copper and iron can, therefore, be leached in a single process and by using an identical leaching liquor. The rate of gold leaching reaction can be enhanced by the co-presence of either copper or bromide ion or both together with the chloride and iron ion.
Public/Granted literature
- US20080078269A1 Method for leaching gold Public/Granted day:2008-04-03
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