Effects of the Minor Additions of Various Oxides on the Dissociation of Zircon

• Published in: Journal of the Ceramic Association, Japan Vol. 80; no. 928; pp. 489 - 497
• Main Authors: UETSUKI, Toru, TANAKA, Kaichiro, NAKAZAWA, Yasuro
• Format: Journal Article
• Language: English; Japanese
• Published: The Ceramic Society of Japan 1972
• ISSN: 0009-0255; 1884-2127
• DOI: 10.2109/jcersj1950.80.928_489

The dissociation of zircon and effects of the minor addition of 19 oxides on its dissociation were systematically investigated by X-ray quantitative analysis. The crystal content of milled fine zircon sand was decreased by treatment with alkaline solution and acid, but its content was increased by heat treatment at 1200°C. The refined effect of zircon was also recognized as to the content of zirconia which crystallized by heat treatment above 1700°C. The decomposition of zircon has to be considered as the precondition of dissociation because the decreased content of zircon crystal has not been suited to crystallized zirconia content. Effects of the minor additions of various oxides on the temperature of dissociation of zircon were related to reaction between added oxide and silica. When the zircon added 2mol% oxide was treated at 1600°C or 1700°C for one hour, the degree of dissociation of zircon was related to the network-modifying ability or network-forming ability of cation of added oxide.