A CaCO3 powder was coated with a chelate compound of aluminum and heated at 300°Cto prepare the AL2O3-coated CaCO3 powder. The apparent viscosity of the aqueous slurry with the AL2O3-coated CaCO3 powder was lower than that of the aqueous slurry with the uncoated CaCO3 powder. The hydrophilic property of the CaCO3 powder was improved by means of AL2O3-coating. The AL2O3-coated CaCO3 powder was homogeneously dispersed in water due to the hydrophilic property. The homogeneous dispersion of the AL2O3-coated CaCO3 powder decreased an amount of water restricted on the particle surface and improved the fluidity of the aqueous slurry.
