RECOVERING METHOD OF FLUORINE

PROBLEM TO BE SOLVED: To provide a recovering method of fluorine by which calcium fluoride having excellent filterability in membrane treatment and a comparatively large particle diameter can be produced. SOLUTION: Fluorine-dissolved aqueous solution is blended with calcium carbonate and /or calcium...

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Bibliographic Details
Main Author MORIYA NORIO
Format Patent
LanguageEnglish
Published 11.03.2004
Edition7
Subjects
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:PROBLEM TO BE SOLVED: To provide a recovering method of fluorine by which calcium fluoride having excellent filterability in membrane treatment and a comparatively large particle diameter can be produced. SOLUTION: Fluorine-dissolved aqueous solution is blended with calcium carbonate and /or calcium sulfate to produce calcium fluoride and thereby fluorine is recovered. By suitably choosing particle size of calcium carbonate and calcium sulfate in used, calcium fluoride of desired particle size can be produced. Thus, a calcium fluoride having a comparatively large particle diameter and excellent filterability can be produced and membrane treatment can be effectively performed to reduce concentration of fluorine contained in waste water or the like. COPYRIGHT: (C)2004,JPO
Bibliography:Application Number: JP20020239217