Probabilistic and fractal approaches to deriving rate equations for heterogeneous oxide dissolution processes

Author： Izotov A.   Gorichev I.   Pankratov D.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 0020-1685

Source： Inorganic Materials, Vol.46, Iss.6, 2010-06, pp. : 660-667

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Abstract

Generalized equations of heterogeneous kinetics are derived which can be used to calculate kinetic parameters of oxide dissolution. Main rate equations are obtained, and their applicability to iron(III) oxide dissolution in sulfuric acid solutions is examined. The dependences of the specific dissolution rate on acid concentration, pH, and temperature are found. Kinetic curves represented as plots of α against t/t 0.5 (where α is the fraction of oxide dissolved at time t and t/t 0.5 is the time needed to dissolve 50% of the sample) are shown to be invariant to the kinetic parameters and the model of dissolution.

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