Numerical simulation of random binary solid leaching kinetics in which one component is selectively soluble were examined. The kinetics are supposed to be controlled by the dissolution rate of this component. Time power laws were observed near percolation threshold for the advance of the leaching front (x(m)similar to t(a) With a = 0.73 in three dimension (3D)) and for the amount of dissolved atoms (n(d)similar to t(b) With b = 0.43 in 3D). The exponents a and b are shown to be related to the fractal dimension d(f) and to the minimum path dimension d(m) of the percolation clusters: a = 1/d(m) and b = (d(f) + 1 - d)/d(m). Application to glass dissolution kinetics is discussed. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 12]
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