In the preparation of the dolomite, the insufficient plasticity has been supplemented with high-viscosity clay by conventional methods, but the deterioration of quality can not be avoided by the impurities (iron, kaolin, etc.) contained in the high-viscosity clay. In addition, high-viscosity clay was severely depleted in resources and had a serious impact on the production of clay. It is an object of the present invention to develop a method of imparting viscosity to a clay having a low viscosity, and to produce a high-quality clay with a low-grade raw material.;Accordingly, the present invention comprises a method of 1) pulverizing clay having a low viscosity (Korean kaolin or the like) into fine particles and imparting an activity to impart viscosity, and 2) a method capable of crushing the clay with fine particles.
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