| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which, in grinding in a high pH range, the viscosity of pigment slurry can be reduced with a smaller amount of a dispersant and causticized light calcium carbonate is efficiently wet-ground. SOLUTION: In the method for wet-grinding aggregated light calcium carbonate obtained in a causticizing step in a pulp making process by a sulfate method or soda method, the light calcium carbonate is slurried and the wet grinding is carried out in a slurry temperature range of 65-85°C so that the B type viscosity (60 rpm) of slurry of 73% concentration at a slurry temperature of 60°C is reduced to≤2,000 mPa s. COPYRIGHT: (C)2009,JPO&INPIT
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