SOLID STATE REDUCTION OF CHROMITE IN HIGH CARBON FERROCHROMIUM-CHROMITE COMPOSITE PELLETS

Abstract: In this paper solid state reduction of high carbon ferrochromium-chromite composite pellets in the temperature range of ۹۰۰-۱۳۵۰°C was investigated. A two stage reduction mechanism is proposed. The first stage is likely to be controlled by the chemical reaction with activation energy of ۱۲۷.۲kJ/mol. In the second stage, solid state diffusion of carbon through the reaction product layer is suggested to be rate controlling. The activation energy of this stage was calculated to be ۹۳.۱kJ/mol. The reduction process was found to be favored by high temperatures as well as high vacuum. The results also show that pre-milling of initial mixture has a negative effect on the reduction degree.

کلیدواژه ها:

Reaction Kinetics ، Solid State Reduction ، Ferrochromium ، Activation Energy.