Reducing agents and double-layered iron ore pellets

In the present investigation, an attempt has been made to study the effect of reducing agents (coke, Non-coking coal, Char, Charcoal, etc.) on the red uction behaviour of double-layered pellets consisting of a core of iron ore and reducing agent mixture within a shell of iron ore. The reduction tests were conducted under isothermal condition in the temperature range 1000-12 00 degrees C. The variables (parameters) studied were the reduction tempera ture, carbon/iron oxide ratio of the core, and reduction time. The experime nts were statistically designed such that the effect of each variable and i nteractional effect of each variable can be quantitatively assessed and com pared. The results show highest degree of reduction with non-coking coal fo llowed by charcoal, char, coke-fines. Among these three parameters, reducti on time has the strongest effect when charcoal and non-coking coal are used as reducing agents, whereas in the case of coke and char, reduction temper ature has the strongest effect. C:Fe2O3 ratio of core has the least effect in all four types of carbonaceous core double-layered pellets. (C) 2000 Pub lished by Elsevier Science B.V. All rights reserved.