METHOD OF RECOVERING FLUORINE

PROBLEM TO BE SOLVED: To provide a method of efficiently recovering fluorine which can efficiently reduce the fluorine concentration of a fluorine-containing solution, can prevent the occurrence of problems such as clogging of piping, and also has been improved in handling property. SOLUTION: When r...

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Bibliographic Details
Main Author MORIYA NORIO
Format Patent
LanguageEnglish
Published 26.10.2006
Subjects
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:PROBLEM TO BE SOLVED: To provide a method of efficiently recovering fluorine which can efficiently reduce the fluorine concentration of a fluorine-containing solution, can prevent the occurrence of problems such as clogging of piping, and also has been improved in handling property. SOLUTION: When recovering fluorine in a fluorine-containing solution by generating calcium fluoride by mixing the fluorine-containing solution and gypsum, a dry gypsum dihydrate, of which the water content due to adhering water is 3.0% or lower, is used as the gypsum. As the fluorine-containing solution, a fluorine-containing drain generated in the process for manufacturing metallic tantalum or niobium powder, for instance, is cited. The average primary particle size of the gypsum is preferably 5-100 μm. COPYRIGHT: (C)2007,JPO&INPIT
Bibliography:Application Number: JP20050116939