| 摘要 |
PROBLEM TO BE SOLVED: To provide a spherical composite body of plate-like calcium carbonate in which calcium carbonate is adopted as the base material of a porous substance, and the size and volume of fine pores can optionally be changed in accordance with production conditions in contrast to many porous substances where the shape of grains, the size of fine pores or the like are fixed. SOLUTION: In the starting material of the spherical composite body of the plate-like calcium carbonate, the primary grains of plate-like calcium carbonate are spherically flocculated. Alternatively, basic calcium carbonate, a composite of basic calcium carbonate and calcium carbonate, a composite of calcium carbonate and calcium hydroxide, or a composite of basic calcium carbonate, calcium hydroxide and calcium carbonate is adopted as the starting material. The starting material is brought into contact with carbon dioxide under heating, and individual substances are changed into calcium carbonate to obtain the spherical composite body of plate-like calcium carbonate.
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