Author/Authors :
Ataie، A. نويسنده , , HESHMATI-MANESH، S. نويسنده , , Sheibani، S. نويسنده Department of Metallurgy and Materials Science Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran , , Khayati، G. R. نويسنده Department of Metallurgy and Materials Science Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran , , Firozbakht، Y. نويسنده , , Sargheini، J. نويسنده ,
Abstract :
In this paper solid state reduction of high carbon ferrochromium-chromite composite
pellets in the temperature range of 900-1350°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 127.2kJ/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 93.1kJ/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.
