Showa Denko K.k.

Eizi Ando

Tadashi Hiraiwa

Kunihiro Miyazaki

Mullite of high purity is obtained by neutralizing an aqueous solution containing a basic aluminum salt and colloidal silica thereby causing formation of a precipitate in the aqueous solution, and subsequently heating the precipitate.

Method for production of mullite of high purity

From a composition of a fine powder and water, a fine powder minimally susceptible of agglomeration is obtained by a method which comprises adding to the composition of a fine powder and water a water-insoluble organic solvent at least in an amount enough for consequently forming an azeotropic composition with respect to the amount of the water involved, converting the resulting mixed liquid into a W/O type emulsion, and removing the water and the organic solvent from the emulsion.

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Shiojiri, Japan

Eizi Ando