Title:
A recovery method of a platinum group metal
Document Type and Number:
Japanese Patent JP6051112
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for efficiently recovering platinum group metals from a catalyst-containing wash coat by a simple low-energy and low environmental load treatment.SOLUTION: A method for recovering platinum group metals from a catalyst-containing wash coat includes: a first leaching step of leaching a catalyst-containing wash coat with a first leachate, which is an aqueous solution of an alkali or an inorganic acid, to obtain a leach residue; a second leaching step of leaching the leach residue with a second leachate containing concentrated hydrochloric acid to obtain a leaching pregnant solution; a pH adjustment step of adding a phosphate to the leaching pregnant solution and adjusting its pH to 6-7 using an alkali; and a bio-reduction step of reducing platinum group metal ions contained in the leaching pregnant solution using metal ion-reducing bacteria to precipitate platinum group metals.
Inventors:
Yasuhiro Konishi
Norizo Saito
Climbing
Norizo Saito
Climbing
Application Number:
JP2013118982A
Publication Date:
December 27, 2016
Filing Date:
June 05, 2013
Export Citation:
Assignee:
Osaka Prefectural University
Hidaka Fine Technologies Co., Ltd.
Hidaka Fine Technologies Co., Ltd.
International Classes:
C22B11/00; C12P3/00; C22B7/00
Domestic Patent References:
| JP2012107294A |
Attorney, Agent or Firm:
Fukami patent office
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