磨砕タルクのアルミニウム塩溶液下におけるカオリナイトおよびスメクタイトへの変換

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Talc has been known as a low reactive mineral under hydrothermal conditions in comparison with the other clays. However, it was expected that grinding treatment increase its reactivity by so-called mechanochemical effect. In the present study, naturally occurred talc from China was ground in vibrating mil to X-ray amorphous state. The ground talc was then treated hydrothermally with aluminum salts solution for various Al (in reaction systems)/Si (in ground talc) molecular ratios ranging from 0.1 to 2.0. The products were examined by means of X-ray diffractometry, thermal analysis, and infrared absorption spectroscopy. It was found that the ground talc is successively converted to trioctahedral smectite, dioctahedral smectite, and kaolinite with increasing the Al/Si ratios, by treatment with acidic alminum bearing solution such as AlCl_3, Al_2(SO_4)_3, and Al(NO_3)_3. Al_<24>O_<11>(OH)_<44>Cl_6 phase and alunite were also formed as the co-products in the way of AlCl_3 and Al_2(SO_4)_3 solution treatment, respectively. On the other hand, by the treatment with NaAlO_2, the ground talc changed to a trioctahedral smectite and an analcime at low Al/Si ratios, but a serpentine and a hydroxysodalite were formed at high Al/Si ratios. In these cases, the reaction was proceeded in basic condition, and the pH value was increased with increasing of the Al/Si ratios. It is concluded that grinding significantly increases the hydrothermal reactivity of talc and the hydrothermal products of the ground talc are controlled by the Si/Al ratio and pH value in reaction system.
日本粘土学会の論文
1999-03-31

磨砕タルクのアルミニウム塩溶液下におけるカオリナイトおよびスメクタイトへの変換

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