Study of SFCA and SFCA-I Phase in the Ternary Phase System of Iron Ore Pellets

Abstract

To get an effective makeover of available low-grade iron ore, the selection of additive with fixed composition is the key variable. Pellets thermal stability and effective reduction depend upon mineralogy, physio chemical characteristics which are governed by the basicity of pellets up to a certain extent. Basicity varies with gangue content present in the iron ore. Therefore to ascertain physio chemical characteristics, a deeper insight analysis is done, microstructure phase study within silico-ferrite of calcium and aluminium (SFCA) system was done. Phase relation of the intermediate phase is calcium ferrite formation which reacts further to form SFCA and SFCA-I. The Physio-chemical and physical properties especially strength is supported by SFCA-I. The grade of ore is also being the base of SFCA or SFCA-I. The ternary phase study gives an overview of the phase relation and thermal and compositional conditions for the formation of SFC phases. In the present study, SFCA/SFCA-I formation during firing at 12500C with pellets of varying basicity, 0.2-1.2 has been observed. The influence of the formation of SFCA/SFCA-I over physical properties is also considered and 0.6 basicity exhibits good pellet quality