A Kinetic Study on the Reduction of Tin Silicate with Carbon Monoxide Gas

Abstract

A kinetic study of the gaseous reduction of tin silicate with carbon monoxide was made by using the thermo balance over the temperature range from 650 to 850°C.
The reduction rate curves obtained were shown that there are two rate-determining steps.
The initial step is assumed to be the phase boundary reaction between tin silicate and carbon monoxide, this is then followed by the slow reduction that the diffusion of the reactants in the solids is the rate-determining step.
The addittion of CaO to the silicate in the range of 50-70% increased markedly the reduction rate and prolonged the initial reduction periods.
The apparent activation energies for the initial reduction period in the case of adittions of CaO 50% and 75% were 30.5 and 22.0 kcal/mole respectively.