Effects of Grinding on Hydrothermal Alternation of Tosudite Clay Mineral.

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  • 水熱条件下におけるトスダイトの変質に及ぽす磨砕効果
  • スイネツ ジョウケンカ ニ オケル トスダイト ノ ヘンシツ ニ オヨボス マ

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Abstract

Li-bearing tosudite has a regularly interstratified structure consisting of chlorite and smectite layers. Hydrothermal treatment of unground and ground Li-tosudite was carried out under 150°C to 250°C in a distilled water and various concentrations of NaOH solutions, and the reacted products were examined by XRD, ethylene gricol treatment and methylene blue absorption capacity.<BR>The final reacted products obtained from the both of unground and ground Li-tosudite were mainly analcime, and swelled Li-tosudite was also formed as a by-product. The formation temperature of analcime using ground Li-tosudite was low compared with that using unground Li-tosudite, and its temperature was also related to concentration of NaOH solution. The analcime formation temperature become low with increasing NaOH concentration in the both cases of unground and ground Li-tosudite.<BR>Heterogeneous substitution of interlayer cation (Na+) was considered to be occurred on the basis of different features of XRD profile after ethylene gricol treatment and under various relative humidity states.<BR>The interlayer structure of Li-tosudite was altered into complex interlayer structure of swelled Li-tosudite, and analcime was readily obtained as a final product from the unground Li-tosudite compared with the ground Li-tosudite. These facts suggest that the reacted products of hydrothermal treatment reflect an original crystal structure of the starting material.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 113 (9), 689-694, 1997

    The Mining and Materials Processing Institute of Japan

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