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

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  • UETSUKI Toru
    Department of Inorganic Materials, Faculty of Industrial Arts, Kyoto Technical University
  • TANAKA Kaichiro
    Department of Inorganic Materials, Faculty of Industrial Arts, Kyoto Technical University
  • NAKAZAWA Yasuro
    Department of Inorganic Materials, Faculty of Industrial Arts, Kyoto Technical University

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  • ジルコンの解離におよぼす酸化物微量添加の影響
  • ジルコン ノ カイリ ニ オヨボス サンカブツ ビリョウ テンカ ノ エイキョウ

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Abstract

The dissociation of zircon and effects of the minor addition of 19 oxides on its dissociation were systematically investigated by X-ray quantitative analysis.<br>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.<br>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.<br>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.

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