Mizusawa Industrial Chemicals, Ltd.

Daisuke Kuse

Hitoshi Yamamoto

Masashi Hatano

Activated regular-shaped clay particles forming macropores therein, preserving fine structure of the dioctahedral smectite clay minerals, and having particle diameters controlled to lie within a range in which they exhibit excellent filtering property. The invention further provides method of producing activated regular-shaped clay particles comprising the steps of adjusting the particle size of the dioctahedral smectite clay minerals to possess a volume-based median diameter (D ) of from 1 to 10 &mgr;m as found by a laser diffraction method, mixing an acid-soluble or acid-decomposing inorganic compound to the milled product thereof, granulating the mixture into regular particles having a volume-based median diameter (D ) of from 10 to 60 &mgr;m as found by a laser diffraction method, and treating the regular-shaped particles with an acid while maintaining the particle shapes.

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Chuo-ku, Japan

Daisuke Kuse