METHOD FOR SEPARATING BISMUTH FROM PLATINUM GROUP ELEMENT
Document Type and Number:
Japanese Patent JP3959990
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.
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May 25, 2007
July 02, 2001
SUMITOMO METAL MINING CO LTD
C22B7/00; C22B11/00; C22B3/26; C22B30/06; C22B7/00; C22B11/00; C22B3/00; C22B30/00; (IPC1-7): C22B11/00; C22B3/26; C22B7/00; C22B30/06