Abstract
AbstractThe results of an experimental program to test the applicability of the grain‐cell model to complex gas‐solid reactions are presented. The hydrogen reduction of solid cobalt sulfide (CO9/8S) in the presence of calcium oxide was chosen for study. Powders of both solids were mixed in a molar ratio of 3.0 (CaO:Co9/8S), compressed into pellet form, then reduced by hydrogen in the temperature range 600‐800°C. The experimental results at different operating conditions were compared with the grain‐cell model, using the Thiele type modulus (H) as an adjustable parameter. In the presence of excess calcium oxide, the structural‐kinetic parameter (γ) was essentially zero, and (H) was found to be the effective parameter, controlling reduction rates. Good agreement between experimental results and model was obtained.
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