Title:
タングステン酸ナトリウム溶液の精製方法
Document Type and Number:
Japanese Patent JP5538953
Kind Code:
B2
Abstract:
To provide a purification method by which molybdenum in an alkali tungstate solution is efficiently removed through a simple treatment process.
The method for purifying an alkali tungstate solution comprises adjusting the pH of a sodium tungstate solution to 7-9.5 by diaphragm electrolysis using a cation exchange membrane, or adjusting the pH of the alkali tungstate solution to 7-9.5 by adding sulfuric acid or acetic acid in place of the diaphragm electrolysis, adding a sulfide and a copper compound to the solution after the pH adjustment to thereby form a molybdenum-containing precipitate, and separating the precipitate by solid-liquid separation to thereby achieve molybdenum removal.
COPYRIGHT: (C)2011,JPO&INPIT
Inventors:
Kenji Nishimura
Junji Abe
Yuko Ishigo
Junji Abe
Yuko Ishigo
Application Number:
JP2010042043A
Publication Date:
July 02, 2014
Filing Date:
February 26, 2010
Export Citation:
Assignee:
Mitsubishi Materials Corporation
Nippon Shinkin Co., Ltd.
Nippon Shinkin Co., Ltd.
International Classes:
C01G41/00; B01J49/00; C02F1/42; C02F1/62
Domestic Patent References:
| JP50124814A | ||||
| JP2000117269A | ||||
| JP57166315A | ||||
| JP2000514030A | ||||
| JP2008150251A | ||||
| JP2008169449A |
Foreign References:
| US3173754 | ||||
| US4115513 | ||||
| CN1084576A |
Attorney, Agent or Firm:
Hiroshi Chiba