| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing high-purity calcium carbonate having low content of strontium. SOLUTION: The method for manufacturing high-purity calcium carbonate includes: a process of bringing quick lime made by firing crystalline limestone into contact with water to produce slaked lime slurry; a process of separating an aqueous phase containing impurities in the slaked lime slurry from slaked lime; a process of dissolving the separated slaked lime into an aqueous solution of ammonium chloride and/or ammonium nitrate to remove a precipitate; and a process of bringing a carbonate or carbon dioxide gas into contact with filtrate obtained by removing the precipitate to deposit calcium carbonate. COPYRIGHT: (C)2011,JPO&INPIT |
