Kinetics of silica sorption and clay dissolution reactions at 1 and 670 atm

Details Kinetics of silica sorption and clay dissolution reactions at 1 and 670 atm Kinetics of silica sorption and clay dissolution reactions at 1 and 670 atm

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..135d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 1, pp.135-141

Physics

Scientific paper

Rates of reactions between clay minerals and silica-spiked seawater and the effect of pressure on the direction, extent and rate of such reactions have been studied. Kinetic behavior of short-term, clay-silica reaction indicates that diffusion is the rate controlling process in both clay dissolution and clay reconstitution reactions. Rate constants of these reactions are of the order of 10 -13 moles/ sec cm 2 . No significant pressure effect on the rate of clay dissolution was observed. Estimates of diffusion coefficient of silicic acid for clay dissolution and silica sorption reactions indicate that the true value lies within the range, 10 -13 -10 -17 cm 2 /sec, thus reflecting the semicrystalline or amorphous nature of the reaction product through which diffusion is occurring.

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