METHOD FOR MANUFACTURING HIGH PURITY CALCIUM CARBONATE

PROBLEM TO BE SOLVED: To provide a high purity calcium carbonate containing a small amount of strontium at low cost. SOLUTION: The method for manufacturing high purity calcium carbonate includes: the step of generating slaked lime slurry by contacting quick lime, having at most 200 sec. of an activa...

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Bibliographische Detailangaben
1. Verfasser:	TSUKADA KAZUHISA
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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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high purity calcium carbonate containing a small amount of strontium at low cost. SOLUTION: The method for manufacturing high purity calcium carbonate includes: the step of generating slaked lime slurry by contacting quick lime, having at most 200 sec. of an activation degree tu-80 of quick lime (particle diameter of under 3.35 mm) tested by the temperature release by slaking (DIN EN 459-2:2001) with water; the step of separating the water phase containing impurities and slaked lime in the slaked lime slurry; the step of removing precipitation by dissolving separated slaked lime in an aqueous solution of ammonium chloride and/or ammonium nitrate; and the step of precipitating calcium carbonate by contacting a filtrate liquid obtained by removing the precipitation with a carbonate salt or a carbon dioxide. COPYRIGHT: (C)2011,JPO&INPIT