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- W96562401 abstract "The dissolution rate of synthetic gibbsite (Alcoa) was measured at pH 3 and 80 C as a function of solution saturation state and NaCl concentration. The experiments were conducted using well-stirred flow-through reaction vessels. Previous work in the laboratory has demonstrated a highly nonlinear dependence of the dissolution and precipitation rate of gibbsite, albite and kaolinite on solution saturation state (i.e., the Gibbs free energy of reaction - [Delta]G). Addition of NaCl to the input solution increases the ionic strength and therefore causes higher degrees of undersaturation due to the change in the activity coefficients. This effect was accounted for by calculating [Delta]G using activity coefficients based on the extended Debye-Huckel equation. Dissolution rates were measured using solutions with NaCl and without NaCl and the rates were then compared at the same [Delta]G. The effect of NaCl on the [Delta]G-functional dependence of the gibbsite dissolution rate can now be analyzed over the entire [Delta]G range of solution undersaturation, from near-equilibrium to far from equilibrium conditions. Preliminary results indicate that NaCl has different effects at different degrees of undersaturation. For example addition of NaCl to highly undersaturated solutions inhibits the rate of the overall dissolution reaction." @default.
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- W96562401 date "1992-01-01" @default.
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- W96562401 title "Effect of NaCl on gibbsite dissolution rate at pH 3 and 80[degree]C" @default.
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