Title:
A manufacturing method of gold dust with high The bulk density
Document Type and Number:
Japanese Patent JP6011809
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing gold powder with a high bulk density, by improving handling efficiency of gold powder and equipment efficiency in a melting step, improving operation and equipment efficiency in a reduction step by preventing adhesion of gold to an inner wall of a reductive reaction tank or a mixer, and achieving efficient and economical production.SOLUTION: A method for manufacturing gold powder includes: bringing diethylene glycol dibutyl ether of an organic solvent into contact with a leached liquid made by leaching gold as tetrachloroauric acid ion so as to extract tetrachloroauric acid ion; washing the tetrachloroauric acid ion-containing organic solvent by hydrochloric acid; mixing the organic solvent after washing and an oxalic acid-containing aqueous solution to bring into contact with each other; and reducing the tetrachloroauric acid ion. When mixing the tetrachloroauric acid ion-containing organic solvent and the oxalic acid-containing aqueous solution to contact each other, a chloride ion concentration in the aqueous solution is adjusted to 60 g/L-90 g/L, and reduction processing is performed after back extracting the tetrachloroauric acid ion into the aqueous solution so as to generate the gold powder with a high bulk density.
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Inventors:
Yasushi Isshiki
Yoshiaki Manabe
Kazunori Tanizaki
Yoshiaki Manabe
Kazunori Tanizaki
Application Number:
JP2013248098A
Publication Date:
October 19, 2016
Filing Date:
November 29, 2013
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
B22F9/24; C22B11/00
Domestic Patent References:
| JP2001207223A | ||||
| JP9316561A | ||||
| JP2008231564A | ||||
| JP2004231675A | ||||
| JP2011001581A | ||||
| JP11335749A | ||||
| JP2011132552A |
Foreign References:
| US5942024 |
Attorney, Agent or Firm:
Yoshitaka Oshida