Title:
METHOD FOR SEPARATING BISMUTH FROM PLATINUM GROUP ELEMENT
Document Type and Number:
Japanese Patent JP3959990
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for extracting and separating bismuth from a platinum group element in a high yield, in which the complete separation has been conventionally difficult, through selectively extracting only bismuth without extracting a platinum group element together, with the use of an extractant which can be industrially usable in a large quantity domestically.
SOLUTION: The method for selectively extracting bismuth into an organic phase is performed by continuing mixing a solution containing a compound of the platinum group element and a soluble or hardly soluble bismuth compound in a dissolved or suspended state, with a strong acid extractant, while controlling pH to 3 or higher, for more than 20 minutes. The above mixing is continued preferably until the time when the bismuth compound, which has precipitated in a process of controlling pH to 3 or higher, dissolves completely. The strong acid extractant is preferably O, O'-bis(2-ethylhexyl)phosphoric acid, and the pH is controlled preferably with addition of sodium hydrogen carbonate.
More Like This:
Inventors:
Satoshi Asano
Toshiki Watanabe
Toshiki Watanabe
Application Number:
JP2001200327A
Publication Date:
August 15, 2007
Filing Date:
July 02, 2001
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
C22B7/00; C22B11/00; C22B3/26; C22B30/06; (IPC1-7): C22B11/00; C22B3/26; C22B7/00; C22B30/06
Attorney, Agent or Firm:
Masao Yamamoto