Title:
METHOD FOR PRODUCING AQUEOUS SOLUTION OF PERRHENIC ACID FROM RHENIUM SULFIDE
Document Type and Number:
WIPO Patent Application WO/2014/103397
Kind Code:
A1
Abstract:
Provided is a method that enables high-purity perrhenic acid to be produced from crude rhenium sulfide using a dry process. This method for producing an aqueous solution of perrhenic acid includes: 1) a step in which roasting is performed on rhenium sulfide in the presence of an oxygen-containing gas, and gasified rhenium oxide is collected; 2) a step in which the rhenium oxide is cooled and solidified, while keeping sulfur oxides associated with the gasified rhenium oxide in a gaseous state, and then the purity of the rhenium oxide is increased by performing solid-gas separation; and 3) a step in which an aqueous solution of perrhenic acid is obtained by dissolving the solidified rhenium oxide in water, or by dissolving the solidified rhenium oxide in water after heating and gasifying the solidified rhenium oxide.
Inventors:
SUMIDA IKUNOBU (JP)
KAWANO YUJI (JP)
HAMAMOTO MAKOTO (JP)
KAWANO YUJI (JP)
HAMAMOTO MAKOTO (JP)
Application Number:
PCT/JP2013/064516
Publication Date:
July 03, 2014
Filing Date:
May 24, 2013
Export Citation:
Assignee:
PAN PACIFIC COPPER CO LTD (JP)
International Classes:
C01G47/00; C22B1/02; C22B3/44; C22B5/12; C22B61/00
Domestic Patent References:
| WO2011115660A2 | 2011-09-22 |
Foreign References:
| JP2012149285A | 2012-08-09 |
Attorney, Agent or Firm:
AXIS Patent International (JP)
Axis international patent business corporation (JP)
Axis international patent business corporation (JP)
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