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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| creator | AKAMATSU YOSHINORI TOKUNAGA ATSUSHI MIYAZAKI TATSUO IDE TOSHIHISA |
| description | 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. |
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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.</description><language>eng</language><subject>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</subject><creationdate>2013</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20131028&DB=EPODOC&CC=JP&NR=2013220956A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20131028&DB=EPODOC&CC=JP&NR=2013220956A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>AKAMATSU YOSHINORI</creatorcontrib><creatorcontrib>TOKUNAGA ATSUSHI</creatorcontrib><creatorcontrib>MIYAZAKI TATSUO</creatorcontrib><creatorcontrib>IDE TOSHIHISA</creatorcontrib><title>METHOD AND APPARATUS FOR PRODUCING CALCIUM FLUORIDE</title><description>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; 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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.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | 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 |
| title | METHOD AND APPARATUS FOR PRODUCING CALCIUM FLUORIDE |
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