Asahi Glass Company, Limited

Kohzo Sakai

Atsushi Hayashi

Toshihiro Ishino

Kiyoharu Kuwabara

Kozo Ojiri

A high zirconia fused refractory product consisting essentially of the following constituents analytically, on a weight basis:

High zirconia fused refractory product

Titanium dioxide component is removed from a mineral containing titanium dioxide component which is difficult to be separated by the conventional electrostatic separation. In the electrostatic separation from the mineral containing titanium dioxide component, the mineral is pretreated by a heat-treatment in an atmosphere of reducing, neutral or inert gas or a mixture thereof so as to change the electrostatic property of titanium dioxide and separating by an electrostatic separation.

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Tokyo, Japan

Kohzo Sakai