| 摘要 |
PROBLEM TO BE SOLVED: To provide a high quality crystalline limestone which is obtained from an impurity-containing slightly low-grade crystalline limestone present in plenty and can sophisticatedly be used as a filler for papermaking or the like, and to provide a production method therefor. SOLUTION: The production method comprises: pulverizing the low-grade crystalline limestone containing the minute amount of impurities; isolating the limestone particles from impurity particles to make slurry; adding to the slurry, the coarse particle of a low-purity limestone as a carrier which contains more impurities and whose surface is hydrophobicized by a surfactant or adding the coarse particle having a hydrophobic surface such as a resin to the slurry as a carrier; making adhere and agglomerating the impurity particle onto the surface of the carrier by stirring; and floatation-removing the carrier to separate and collect the extremely high-purity and high-quality crystalline limestone. COPYRIGHT: (C)2006,JPO&NCIPI
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