METHOD FOR PRODUCING AQUEOUS SOLUTION OF PERRHENIC ACID FROM RHENIUM SULFIDE

WIPO Patent Application WO/2014/103398

A1

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 a first roasting is performed on rhenium sulfide in the presence of an oxygen-containing gas, generating rhenium oxide and sulfur oxide, and then gasifying and discharging the sulfur oxide to obtain rhenium oxide as a roasting residue; 2) a step in which a second roasting is performed on the roasting residue in the presence of an oxygen-containing gas, and gasified rhenium oxide is collected; 3) a step in which the gasified rhenium oxide is solidified by cooling, or a step in which an aqueous solution of perrhenic acid is obtained by dissolving the gasified rhenium oxide in water while cooling the gasified rhenium oxide; and 4) and a step in which, if the rhenium oxide was solidified, an aqueous solution of perrhenic acid is obtained either 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.

SUMIDA IKUNOBU (JP)
KAWANO YUJI (JP)
HAMAMOTO MAKOTO (JP)

PCT/JP2013/064517

July 03, 2014

May 24, 2013

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PAN PACIFIC COPPER CO LTD (JP)

C22B61/00; C01G47/00; C22B1/02; C22B3/44; C22B5/12

WO2011115660A2

2011-09-22

JP2012149285A

2012-08-09

AXIS Patent International (JP)
Axis international patent business corporation (JP)

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