METHOD OF PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY

METHOD OF PRODUCING GYPSUM HAVING EXCELLENT FILTERABILITY

PROBLEM TO BE SOLVED: To provide a method of using phosphorous ore for producing wet phosphoric acid in the dihydrate-hemihydrate process, and to provide a method of correctly predicting added amounts of silica substances such as diatomaceous earth and fluorine compounds. SOLUTION: In the method of...

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Bibliographische Detailangaben
Hauptverfasser: AMANO SHOZO, HARADA FUMIE, HATSUJI HISAKAZU, HATSUDA NOBORU
Format: Patent
Sprache:eng
Schlagworte:
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
LIME, MAGNESIA
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method of using phosphorous ore for producing wet phosphoric acid in the dihydrate-hemihydrate process, and to provide a method of correctly predicting added amounts of silica substances such as diatomaceous earth and fluorine compounds. SOLUTION: In the method of producing wet phosphoric acid in a dihydrate- hemihydrate process, by adding fluorine compounds to phosphorous ore gypsum having excellent filterability can be obtained. Further, in the method, the content of silica insoluble in mixed acid from the total silica in the phosphorous ore is regarded as the content of active silica, and the amount of fluorine compounds to be added and, the amount of silicon compounds to be added are correctly predicted. COPYRIGHT: (C)2003,JPO