METHOD FOR PRODUCING PERRHENIC ACID AQUEOUS SOLUTION FROM CRUDE RHENIUM SULFIDE

摘要

PROBLEM TO BE SOLVED: To provide a method capable of producing high-purity perrhenic acid from a crude rhenium sulfide containing mercury by a dry process.SOLUTION: There is provided a method for producing a perrhenic acid aqueous solution which comprises: 1) a step of subjecting crude rhenium sulfide containing mercury to first burning in the presence of an oxygen-containing gas to generate rhenium oxide and a sulfur oxide and gasifying and discharging mercury and the sulfur oxide to obtain the rhenium oxide as a burning residue; 2) a step of subjecting the burning residue to second burning in the presence of an oxygen-containing gas to collect the gasified rhenium oxide; 3) a step of cooling and solidifying the gasified rhenium oxide or a step of obtaining a perrhenic acid aqueous solution by dissolving the gasified rhenium oxide in water while cooling with water; and 4) a step of obtaining the perrhenic acid aqueous solution by dissolving the solidified rhenium oxide in water, or heating and gasifying the solidified rhenium oxide and followed by dissolving in water, when the rhenium oxide is solidified.