Structural Characterization Multi-component SFCA (Silico-Ferrite Calcium Aluminum) Realized in the Actual Sintered Ore

The chemical analysis and structural evaluation for the multi-component calcium ferrites were carried out, focusing on the microstructural classifications 1H-ACF, 2H-CF and M-FCF used in the 'Development of environmentally friendly steelmaking process technology (COURSE 50)'. The synthesis was carried out with reference to the multi-component calcium ferrite compositions observed in 1H-ACF, 2H-CF and M-FCF. The crystal structure of 1H-ACF and 2H-CF is strongly influenced by the final temperature reached during sintering. And the crystalline phases observed in 1H-ACF and 2H-CF are SFCA and SFCA-I, with a small amount of SFCA-III. On the other hand, the structure of the SiO2-rich M-FCF was SFCA. The crystal structure of 2H-CF in "sinter 5" was evaluated by single-crystal X-ray diffraction analysis. The multicomponent calcium ferrites in the 2H-CF region of the actual sintered ores reflect the fact that SFCA, SFCA-I and SFCA-III are of the M14+6nO20+8n (M = Si, Fe, Al, Ca, Mg) polysomatic series, and are therefore either SFCA with structural defects or SFCA-I. In the 2H-CF region, SFCA-III, rich in Fe2O3 and poor in MgO, was also found and the model structural composition was Ca6.66Fe39.43Al3.28Mg2.63O72, with the MgO component playing an important role in the formation of spinel sheets. SFCA-III, described in detail for the first time in this report, is richer in Fe2O3 than those of SFCA and SFCA-I, suggesting an interesting active role as a new component operating in a more reducing environment with Fe2+ present.