METHOD FOR SEPARATING RHENIUM FROM SOLUTION CONTAINING PERRHENIC ACID

• Main Authors: TAKEDA KAZUNORI, KUBOTA NAOKI, KUDO TAKASHI, ASANO SATOSHI
• Format: Patent
• Language: English
• Published: 24.03.2011
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide an inexpensive method, even if the content of rhenium in raw material is remarkably varied, which can stably and efficiently separate rhenium. SOLUTION: In the method for separating rhenium from a solution containing one or more elements selected from copper, zinc, cadmium and arsenic, and perrhenic acid, the method comprises: a first stage 1 where alkali such as sodium hydroxide is added to the solution so as to produce precipitates, and the solution containing the precipitates is subjected to solid-liquid separation by a separation process such as filtration; a second stage 2 where acid such as sulfuric acid is added to a separated liquid obtained by the solid-liquid separation, and the concentration of the acid is regulated to a range satisfying the equivalent concentration of 1.0 to 4.0 normal; and a third stage 3 where a sulfurizing agent such as sodium hydrogensulfide is added to the regulation liquid obtained by the addition of the acid so as to produce sulfide precipitates, and the sulfide precipitations are separated from the liquid after the sulfurization. COPYRIGHT: (C)2011,JPO&INPIT