Flake-like composition and flake-like composition production method

A process for producing a flake shaped composition material, the process comprising the steps of:

• i) heating a raw material containing waste material generated from a coal-fueled thermal power plant to a temperature of 1300° C. or higher in a heating chamber of a furnace, wherein the heating chamber comprises a tubular lumen penetrating through the furnace;
• and
• ii) causing said heated raw material to drip downwardly from the tubular lumen of the heating chamber and solidify into spherical material;
• and
• iii) subsequently, pulverizing said spherical material into flake shaped particles, wherein in said raw material, a total content of SiO2 and Al2O3 in said raw material is between 46% by mass and 62% by mass, a content of SiO2 is 33 to 52% by mass, and a content of Al2O3 is 8 to 13% by mass.