Abstract
Montmorillonite was synthesized by hydration of sodium, magnesium aluminosilicate glass under hydrothermal pressure of 100 MPa. The water/solid ratio of starting mixtures was varied in the range 0.155 to 2.17. If complete conversion from glass to montmorillonite is assumed, the ratios correspond to 4(OH) and nH 2 O, n=5 to 80, for Na 0.66 (Mg,Al) 4 (Si,Al) 8 O 20 (OH) 4 .nH 2 O. The synthesis temperature ranged from 250 to 475°C. Run products were analyzed by X-ray diffraction. Yield of montmorillonite and its crystallinity increased drastically at the water/solid ratio of 0.310 (i.e.n=10) but were saturated in more water-rich conditions
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