Effect of Al₂O₃ on the Composition and Microstructures of Crystal Products of CaO-Fe₂O₃ Melt

As one of major burdens of blast furnace,the metallurgical performance of high basicity iron ore sinter is highly related to the ironmaking process in blast furnace..In this study,the effect of Al₂O₃ on the composition and microstructures of crystal products of CaO-Fe₂O₃ melt was investigated by changing the Al₂O₃content in CaO-Fe₂O₃ melt.It was found out that the CaFe₂O₄ decreased with increasing Al₂O₃ content.When Al₂O₃ content reached 3%,Ca₂Fe₂O₅ and Fe-rich calcium ferrite crystallized from melt and their content increased with increasing Al₂O₃ content.The microstructure of Fe-rich calcium ferrite became thinner with increasing Al₂O₃ content.The viscosity of CaO-Fe₂O₃ melt was also increased with increasing Al₂O₃content.When the Al₂O₃ content exceeded 5%,the crystallization of calcium ferrite was depressed significantly.