Title:
金の溶媒抽出
Document Type and Number:
Japanese Patent JP6408609
Kind Code:
B2
Abstract:
The present invention provides a method of extracting gold from pregnant leach solution (PLS) obtained from leaching of gold, comprising the steps of: (a) extracting the PLS with an organic extractant comprising an organic diester and an organic long-chain alcohol to obtain a first organic phase comprising gold; (b) stripping gold from the first organic phase with a first water to obtain a first aqueous raffinate comprising gold and a first depleted organic phase; (c) adding HCl and NaCl into the first aqueous raffinate to increase its acid content to at least 8 g/L and chloride content to at least 30 g/L to obtain a first aqueous solution comprising gold; (d) extracting the first aqueous solution with an organic extractant comprising an organic diester and an organic long-chain alcohol to obtain a second organic phase comprising gold; (e) stripping gold from the second organic phase with a second water solution to obtain a second aqueous raffinate comprising gold and a second depleted organic phase; (f) optionally repeating steps (c) to (e) one or more times to obtain a final aqueous raffinate comprising gold.
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Inventors:
Haa Palainen, Mika
Karonen, Janne
Karonen, Janne
Application Number:
JP2016570827A
Publication Date:
October 17, 2018
Filing Date:
June 04, 2015
Export Citation:
Assignee:
OUTOTEC (FINLAND) OY
International Classes:
C22B11/00; B01D11/04; C22B3/26
Domestic Patent References:
| JP2013534969A | ||||
| JP2012532989A | ||||
| JP2011513583A | ||||
| JP61272328A | ||||
| JP2006233317A | ||||
| JP58060619A |
Foreign References:
| US20140363356 |
Attorney, Agent or Firm:
Aiwa Patent Business Corporation
Takao Katori
Koichi Kikuchi
Takao Katori
Koichi Kikuchi