METHOD FOR PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY
PROBLEM TO BE SOLVED: To utilize rock phosphate which could not be used in the conventional method for producing phosphoric acid by the wet process employing a dihydrate- hemihydrate process, and to provide a method for precisely estimating the amounts of diatomaceous earth and a fluorine-based comp...
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| creator | AMANO SHOZO HATSUJI HISAKAZU HATSUDA NOBORU |
| description | PROBLEM TO BE SOLVED: To utilize rock phosphate which could not be used in the conventional method for producing phosphoric acid by the wet process employing a dihydrate- hemihydrate process, and to provide a method for precisely estimating the amounts of diatomaceous earth and a fluorine-based compound to be added. SOLUTION: In the method for producing phosphoric acid by the wet process employing a dihydrate-hemihydrate process, rock phosphate which could not be used in the conventional process and apparatus is used by adding a fluorine- based compound and/or hemihydrate gypsum to produce gypsum having excellent filterability. Further, by a method where the value obtained by deducting the content of silica in an insoluble component of aqua resia from the total silica content in rock phosphate is regarded as the content of active silica, the amount of a fluorine-based compound to be added, and further the amount of siliceous material such as diatomaceous earth is correctly estimated. |
| format | Patent |
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SOLUTION: In the method for producing phosphoric acid by the wet process employing a dihydrate-hemihydrate process, rock phosphate which could not be used in the conventional process and apparatus is used by adding a fluorine- based compound and/or hemihydrate gypsum to produce gypsum having excellent filterability. Further, by a method where the value obtained by deducting the content of silica in an insoluble component of aqua resia from the total silica content in rock phosphate is regarded as the content of active silica, the amount of a fluorine-based compound to be added, and further the amount of siliceous material such as diatomaceous earth is correctly estimated.</description><edition>7</edition><language>eng</language><subject>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</subject><creationdate>2003</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=20030226&DB=EPODOC&CC=JP&NR=2003054944A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20030226&DB=EPODOC&CC=JP&NR=2003054944A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>AMANO SHOZO</creatorcontrib><creatorcontrib>HATSUJI HISAKAZU</creatorcontrib><creatorcontrib>HATSUDA NOBORU</creatorcontrib><title>METHOD FOR PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY</title><description>PROBLEM TO BE SOLVED: To utilize rock phosphate which could not be used in the conventional method for producing phosphoric acid by the wet process employing a dihydrate- hemihydrate process, and to provide a method for precisely estimating the amounts of diatomaceous earth and a fluorine-based compound to be added. SOLUTION: In the method for producing phosphoric acid by the wet process employing a dihydrate-hemihydrate process, rock phosphate which could not be used in the conventional process and apparatus is used by adding a fluorine- based compound and/or hemihydrate gypsum to produce gypsum having excellent filterability. Further, by a method where the value obtained by deducting the content of silica in an insoluble component of aqua resia from the total silica content in rock phosphate is regarded as the content of active silica, the amount of a fluorine-based compound to be added, and further the amount of siliceous material such as diatomaceous earth is correctly estimated.</description><subject>CHEMISTRY</subject><subject>COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS</subject><subject>COMPOUNDS THEREOF</subject><subject>INORGANIC CHEMISTRY</subject><subject>METALLURGY</subject><subject>NON-METALLIC ELEMENTS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2003</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLDydQ3x8HdRcPMPUggI8ncJdfb0c1dwjwwIDvVV8HAMA_FcI5xdfXxc_UIU3Dx9QlyDHJ08fTxDInkYWNMSc4pTeaE0N4OSm2uIs4duakF-fGpxQWJyal5qSbxXgJGBgbGBqYmliYmjMVGKACRhKcA</recordid><startdate>20030226</startdate><enddate>20030226</enddate><creator>AMANO SHOZO</creator><creator>HATSUJI HISAKAZU</creator><creator>HATSUDA NOBORU</creator><scope>EVB</scope></search><sort><creationdate>20030226</creationdate><title>METHOD FOR PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY</title><author>AMANO SHOZO ; HATSUJI HISAKAZU ; HATSUDA NOBORU</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2003054944A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2003</creationdate><topic>CHEMISTRY</topic><topic>COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS</topic><topic>COMPOUNDS THEREOF</topic><topic>INORGANIC CHEMISTRY</topic><topic>METALLURGY</topic><topic>NON-METALLIC ELEMENTS</topic><toplevel>online_resources</toplevel><creatorcontrib>AMANO SHOZO</creatorcontrib><creatorcontrib>HATSUJI HISAKAZU</creatorcontrib><creatorcontrib>HATSUDA NOBORU</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>AMANO SHOZO</au><au>HATSUJI HISAKAZU</au><au>HATSUDA NOBORU</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>METHOD FOR PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY</title><date>2003-02-26</date><risdate>2003</risdate><abstract>PROBLEM TO BE SOLVED: To utilize rock phosphate which could not be used in the conventional method for producing phosphoric acid by the wet process employing a dihydrate- hemihydrate process, and to provide a method for precisely estimating the amounts of diatomaceous earth and a fluorine-based compound to be added. SOLUTION: In the method for producing phosphoric acid by the wet process employing a dihydrate-hemihydrate process, rock phosphate which could not be used in the conventional process and apparatus is used by adding a fluorine- based compound and/or hemihydrate gypsum to produce gypsum having excellent filterability. Further, by a method where the value obtained by deducting the content of silica in an insoluble component of aqua resia from the total silica content in rock phosphate is regarded as the content of active silica, the amount of a fluorine-based compound to be added, and further the amount of siliceous material such as diatomaceous earth is correctly estimated.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| 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 |
| title | METHOD FOR PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY |
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