METHOD AND APPARATUS FOR PRODUCING CALCIUM FLUORIDE

METHOD AND APPARATUS FOR PRODUCING CALCIUM FLUORIDE

PROBLEM TO BE SOLVED: To provided a method for producing, from drain water containing hydrosilicofluoric acid, calcium fluoride having a particle size and high purity suitable as a material for producing hydrofluoric acid.SOLUTION: A method for producing calcium fluoride using hydrosilicofluoric aci...

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Bibliographische Detailangaben
Hauptverfasser: AKAMATSU YOSHINORI, TOKUNAGA ATSUSHI, MIYAZAKI TATSUO, IDE TOSHIHISA
Format: Patent
Sprache:eng
Schlagworte:
AMMONIA
CHEMISTRY
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
CYANOGEN
INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Zusammenfassung:PROBLEM TO BE SOLVED: To provided a method for producing, from drain water containing hydrosilicofluoric acid, calcium fluoride having a particle size and high purity suitable as a material for producing hydrofluoric acid.SOLUTION: A method for producing calcium fluoride using hydrosilicofluoric acid-containing water includes: a step [1] of reacting the hydrosilicofluoric acid-containing water with an ammonium compound and producing a first reaction product that includes insoluble silica and an ammonium fluoride aqueous solution; a step [2] of separating the insoluble silica from the first reaction product; a step [3] of reacting the first reaction product from which the insoluble silica has been separated, with calcium carbonate and producing a second reaction product that includes calcium fluoride and an ammonium carbonate aqueous solution; and a step [4] of separating the ammonium carbonate aqueous solution from the second reaction product.