Abstract
During the hydrothermal treatment of a bentonite in the presence of potassium solutions a release of protons, silica and other elements was observed. It is suggested that these products arise as a consequence of the beginning of the transformation of smectite into illite. After the short time of the treatment, 21 days, it is not possible to detect any layer of neoformed mica, but this quantity can be indirectly determined from the stoiquiometric reaction of transformation smectite-to-illite through the number of moles of hydrogen ion released to the solution. Under the assumption that the transformation is a first order reaction, the time needed for the complete destruction of smectite was also calculated. In the range of 100°C smectite resists more than eighty thousand years before being transformed into illite. These results are in agreement with other described in the literature.
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