Method for producing aqueous solution of perrhenic acid from rhenium sulfide
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United States of America Patent
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Apr 25, 2017
Grant Date -
Apr 23, 2015
app pub date -
May 24, 2013
filing date -
Dec 28, 2012
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Abstract
A method allowing production of high-purity perrhenic acid from rhenium sulfide by applying pyrometallurgical process is provided. A method for producing an aqueous solution of perrhenic acid, comprising: 1) a step for performing a first roasting process of rhenium sulfide under an oxygen-containing gas to generate rhenium oxide and sulfur oxide, the sulfur oxide being gasified for discharge and the rhenium oxide being obtained as a roasted residue; 2) a step for performing a second roasting process of the roasted residue under an oxygen-containing gas to collect gasified rhenium oxide; 3) a step for cooling and solidifying the gasified rhenium oxide, or a step for dissolving the gasified rhenium oxide into water while water-cooling to obtain the aqueous solution of perrhenic acid; and 4) in case where the rhenium oxide is solidified, a step for dissolving the solidified rhenium oxide into water, or heating and gasifying the solidified rhenium oxide and then dissolving the gasified rhenium oxide into water, to obtain the aqueous solution of perrhenic acid.
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