THERMODYNAMIC AND KINETIC INVESTIGATION OF IRON SILICATE REDUCTION WITH DIFFERENT REDUCING AGENTS
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2022-01-01
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Abstract
The thermodynamics and kinetics of the reduction of iron silicate (fayalite), generated as a result of flotation processes in the production of copper concentrates, were studied. Three reducing agents were used - coke, charcoal, and graphite, in ratios to the stoichiometrically calculated amounts of reducer: 1: 1.5; 1: 2; 1: 2.5. The free Gibbs energy in the temperature range from 973 K to 1040 K was determined experimentally and the corresponding equations for 4G = f(T) were derived. The kinetic parameters were determined using thermogravimetric and differential methods at temperatures up to 1273 K. The results showed that the reduction process using coke went through three stages, and using charcoal - two stages. The reactions that took place were of the first order. Carbonated reduction of iron silicate occurred in the kinetic region. The highest values of the apparent activation energy were obtained as 67.83 kJ mol-1 when using coke (1257 K), and when using graphite - 60.29 kJ mol-1 at 1318 K. The lowest values of the activating energy 36 kJ mol-1 were observed with a charcoal reducer in the temperature range 966-1573 K.