Reduction behavior of lignite and coke fine containing composite pellets

Abstract

In the present investigation, an attempt has been made to study the reduction behavior of composite pellets consisting two different types of iron oxide fines (high and low grade) and coke or lignite fines as reducing agents. The reduction experiments were carried out under isothermal conditions and constant flow of nitrogen gas in the temperature range of 900 - 1100 C. The variables investigated are the reduction temperature, C-fix/Fe3O4 ratio, reduction time and reductant type. In the experiments carried out with Sivas Divrigi A head magnetite ores (high grade) at a temperature of 1100 degrees C, for 40 minutes and on the condition that C-fix/Fe3O4 ratio is 0.2, in which lignite and coke fines were used as reductant, degree of reduction was obtained as 91 % and 86 %, respectively. Whereas, in the experiments realized with Malatya-Hekimhan-Hasancelebi magnetite ores (low grade) on the same conditions by using lignite as the reductant, around 60 % degree of reduction was found.