1987 Volume 73 Issue 11 Pages 1512-1518
Chromium ore pellet containing carbonaceous material was reduced at various temperatures between 1 000 and 1 200°C in flowing N2-CH4 and N2-H2 atmospheres. Below 1 050°C the reduction rate in N2-CH4 atmosphere was much higher than that in N2-H2 atmosphere. From the consideration about the results of the present and previous works, it was reasoned that such a promoting effect of CH4 was attributed to the enhanced conversion of CO2 and H2O to CO and H2 with CH4 and fine carbon deposited from it. To the contrary, above 1 100°C the reduction was retarded in N2-CH4 atmosphere. This seemed to be attributed to the fact that in higher temperature range the deposited carbon hindered the mass transfer of gas species through the inside of pellet because it clogged to a large extent the pores, particularly in the peripheral zone of pellet.
