Oblon, Spivak, McClelland, Maier & Neustadt
Preparation method for zircon powder
 A preparation method for zircon powder, which comprises heating a feed powder mixture comprising: PA1 (1) silica and zirconia obtained by subjecting a liquid having a pH of not higher than 8 and containing silica and zirconia in a SiO.sub.2 /ZrO.sub.2 molar ratio of substantially 1/1, to liquid-removing treatment, and PA1 (2) zircon in an amount of at least 0.1% by weight based on the total amount of said silica and zirconia, at a heating rate of not higher than 5.degree. C./min from 1,200.degree. C. to a calcination temperature, and maintaining it at a calcination temperature of from 1,300.degree. to 1,700.degree. C. for from 1.0 to 24 hours. 
Tosoh Corporation
C C
C04B C01B
inventional inventional
Yoshitaka Hidehiko Takashi Toshiyuki
Kubota Kobayashi Mitamura Mori