The hydrothermal transformation rate of kaolinite to muscovite/illite

Details The hydrothermal transformation rate of kaolinite to muscovite/illite The hydrothermal transformation rate of kaolinite to muscovite/illite

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2979c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 11, pp.2979-2990

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Scientific paper

Batch reactor experiments were performed to measure the rate of the reaction 1.5 kaolinite + K + = muscovite + H + + 1.5 water at temperatures ranging from 250 to 307°C. In these experiments, the rate of kaolinite conversion to muscovite/illite was monitored as the rate of production of H + . Runs were performed in small volume (50 mL) titanium hydrothermal reactors charged with well-crystallized Georgia kaolinite, Indian Ruby muscovite, and 25 mL of KCl solution (0.5-2.0 m). Both solids and solutions were monitored at specific intervals throughout each experiment. The determined rate law is where m k + + and m H + are the concentrations of potassium ion and hydrogen ion, k + and k - are the forward and reverse rate constants in kg m -2 sec -1 , A m is the total surface area of the muscovite in m 2 , and M is the mass of the solution in kg. The initial rate method was used to find k + , and k - was found by fitting data to an integrated rate equation. Temperature functions for the rate constants are In k + = 12.90 - ( 1.87 × 10 4 / T ), R 2 = 0.98, and In k - = 6.03 - ( 1.21 × 10 4 / T ), R 2 = 0.95. The activation energies ( E a ) for the forward and reverse reaction are 155 ± 15 kJ mol -1 and 101 ± 10 kJ mol -1 , respectively.

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