Abstract
A general model describing simultaneous independent reactions between one fluid reactant and two solid reactants is presented. Such reaction systems are attracting much attention in the areas of oil shale retorting, reduction of mixed metal oxides with a reducing gas, leaching of mixed minerals, and roasting of mixed sulfides. The model has been formulated in general terms so as to allow the incorporation of specific details of an actual system. The law of additive reaction times previously developed for single fluid-solid reactions and found useful for the analysis of the reaction between one solid and two fluid reactants has been applied to the reaction system under consideration. It has yielded a useful approximate solution, which obviates the necessity for repeated numerical solution of a second-order differential equation with split boundary conditions and removes the possibility of encountering the numerical stiffness problem.
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