カネマイトからの粘土鉱物の水熱合成

概要

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In order to develop the method of synthesizing novel layered materials having the effective usage in industry, kanemite, one of the hydrous sodium polysilicate, was converted to some clay minerals. Kanemite was treated hydrothermally with aluminum and magnesium salts solution for various Al or Mg(in reaction system)/Si(in kanemite)molecular ratios ranging from 0.1 to 2.0 at 200 and 250℃ for 1 to 10 days under saturated vapor pressures. The products were examined by means of X-ray diffractometry, thermal analysis, and transmission electron microscopy. By treatment with basic Magnesium carbonate kanemite changed to trioctahedral smectite and serpentine with increasing Mg/Si ratio. On the other hand, only kaolinite, having 1:1 structure, was formed by reaction with AlCl_3 solution and 2:1 type mineral of trioctahedral smectite and talc are formed by MgCl_2 solution. These results are different from previous studies that the 1:1 type and 2:1 type clay minerals had been formed in the high and low ratios of Al or Mg/Si in the reaction system, respectively. There is some possibility, however, that the pH of the solution and/or the structure of the starting material affected the process of hydrothermal reaction.
日本粘土学会の論文
2001-07-31