| abstract |
(57) [Summary] [Problem] Since most of porous materials have fixed particle shapes, pore sizes, etc., calcium carbonate is used as a base material of the porous material, and the fineness depends on the manufacturing conditions. An object of the present invention is to provide a spherical composite of plate-like calcium carbonate whose pore size and pore volume can be arbitrarily changed. A spherical composite of plate-like calcium carbonate and a basic calcium carbonate, a composite of basic calcium carbonate and calcium carbonate, a composite of basic calcium carbonate and calcium carbonate, wherein primary particles of calcium carbonate having a plate-like structure are spherically aggregated. A complex of calcium oxide, a complex of basic calcium carbonate and calcium hydroxide and calcium carbonate, and a spherical complex of plate-like calcium carbonate in which calcium carbonate is aggregated spherically are brought into contact with carbon dioxide under heating, and each substance is separated. It is an object to provide a spherical composite of plate-like calcium carbonate converted into calcium carbonate and a method for producing the same. |