SPINDLE-LIKE LIGHT CALCIUM CARBONATE SLURRY AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a spindle-like light calcium carbonate slurry having low viscosity for both L-viscosity and H-viscosity regardless of a high solid concentration exceeding 70 wt.%, and to provide a method for producing it.;SOLUTION: This method for producing a spindle-like light calcium carbonate slurry comprises a wet-type dispersion treatment process of the spindle-like light calcium carbonate slurry having a solid concentration of 70 to 78 wt.% in which a pre-mixing of a system consisting of spindle-like light calcium carbonate and water mixed with a dispersant by a mixer makes a slurry having 0.5 to 1.5 μm media diameter and 25 to 250 mPa.s viscosity measured by B-type viscometer, and a milling by disk agitating type medium grinding mill is performed at a circumferential speed of the disk satisfying an inequality: 1.1×104 A1/2B-3/4C-1/2D-1≤V≤5.4×104A1/2B-3/4C-1/2D-1 (where A: a medium diameter [mm], B: a viscosity of pre-mixed slurry measured by B-type viscometer [mPa.s], C: a specific gravity of medium [-], D: a filling rate of medium [%], V: circumferential speed of disk [m/s]).;COPYRIGHT: (C)2002,JPO