Title:
TANTALUM RECOVERY METHOD
Document Type and Number:
WIPO Patent Application WO/2012/132962
Kind Code:
A1
Abstract:
A tantalum recovery method which with which it is possible to recover tantalum from waste containing relatively large quantities of copper and tungsten, such as discarded boards, including printed circuit boards in particular. Therein, magnetic separation is carried out, and tantalum-containing waste obtained by separating tantalum-containing substances in tantalum-containing waste is subjected to acid treatment in an oxidizing atmosphere, then subsequently subjected to roasting and alkali treatment, thereby reducing the copper and tungsten contained in the tantalum-containing waste, and making it possible to recover high-purity tantalum.
Inventors:
AOKI TATSUYA (JP)
MATSUZAKI KENJI (JP)
MATSUZAKI KENJI (JP)
Application Number:
PCT/JP2012/056869
Publication Date:
October 04, 2012
Filing Date:
March 16, 2012
Export Citation:
Assignee:
MITSUI MINING & SMELTING CO (JP)
AOKI TATSUYA (JP)
MATSUZAKI KENJI (JP)
AOKI TATSUYA (JP)
MATSUZAKI KENJI (JP)
International Classes:
C22B34/24; B09B3/00; B09B5/00; C22B1/00; C22B1/02; C22B3/04; C22B7/00
Domestic Patent References:
| WO2011125510A1 | 2011-10-13 |
Foreign References:
| JPH02302100A | 1990-12-14 | |||
| JP2010214352A | 2010-09-30 | |||
| JPS6475632A | 1989-03-22 | |||
| JP2000007338A | 2000-01-11 | |||
| JP2004002927A | 2004-01-08 | |||
| JP2004224619A | 2004-08-12 | |||
| JP2009221514A | 2009-10-01 |
Attorney, Agent or Firm:
TANAKA AND OKAZAKI (JP)
Patent business corporation Tanaka and Okazaki and associates (JP)
Patent business corporation Tanaka and Okazaki and associates (JP)
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