METHOD FOR RECOVERING CALCIUM FLUORIDE FROM BY-PRODUCED MIXED SALT CONTAINING FLUORINE

PROBLEM TO BE SOLVED: To recover fluorine as calcium fluoride from a by-produced mixed salt containing sodium fluoride and/or potassium fluoride and to reutilize the recovered calcium fluoride as a raw material for producing hydrogen fluoride. SOLUTION: Fluorine in the by-produced mixed salt contain...

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Hauptverfasser:	KIKUYAMA HIROHISA, WAKI MASAHIDE, YAZAKI YOJI, AOKI KENJI, MIYAMOTO KAZUHIRO, IZUMI HIROTO, HASHIGUCHI SHINJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS INORGANIC CHEMISTRY METALLURGY
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To recover fluorine as calcium fluoride from a by-produced mixed salt containing sodium fluoride and/or potassium fluoride and to reutilize the recovered calcium fluoride as a raw material for producing hydrogen fluoride. SOLUTION: Fluorine in the by-produced mixed salt containing sodium fluoride and/or potassium fluoride is reacted with calcium sulfate and recovered as calcium fluoride. COPYRIGHT: (C)2004,JPO