Title:
PRECIOUS METAL POWDER PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/047542
Kind Code:
A1
Abstract:
The present invention provides a precious metal powder production method enabling the production of, at low cost, a highly pure and highly crystalline precious metal powder that has a narrow particle-size distribution. The present invention pertains to a precious metal powder production method comprising: a step for preparing an acidic aqueous solution of a calcium compound and at least one precious metal compound; a step for adding the acidic aqueous solution to a basic aqueous solution to form calcium hydroxide and an oxide, a hydroxide, or a mixture of a precious metal; a step for reducing the oxide, the hydroxide, or the mixture of the precious metal by using a reducing agent; and a step for separating, and applying heat on, a solid content containing a reductant of the precious metal.
Inventors:
YAMAZAKI TAKAHISA (JP)
NAGAOKA AKIO (JP)
NAGAOKA AKIO (JP)
Application Number:
PCT/JP2016/076777
Publication Date:
March 23, 2017
Filing Date:
September 12, 2016
Export Citation:
Assignee:
TANAKA PRECIOUS METAL IND (JP)
International Classes:
B22F9/24; B22F1/142; H01B13/00; B22F1/052
Foreign References:
| JPH10102109A | 1998-04-21 | |||
| JPH10183208A | 1998-07-14 | |||
| JP2006199982A | 2006-08-03 | |||
| JP2008095174A | 2008-04-24 | |||
| US20130202909A1 | 2013-08-08 |
Other References:
See also references of EP 3351324A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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