Research progress on sillico-ferrite of calcium and aluminum(SFCA)bonding phase in sintering process
The sintering process of iron ore is an essential part of the steelmaking process.Calcium ferrite,as the main bonding phase in sinter,significantly influences the sintering process and metallurgical properties of sinter.The research progress on the chemical composition,formation mechanism,reduction mechanism,and influence of gangue components of calcium ferrite and its complex system in the iron ore sintering process are reviewed.In sum-mary,the chemical composition of calcium ferrite is determined by the concentrations of Fe,Ca,Si,Al,and other elements present in the sinter.The sillico-ferrite of calcium and aluminum(SFCA)can be expressed by the general formula xFe2O3·ySiO2·zAl2O3·5CaO,where x+y+z=12;The formation mechanism of calcium ferrite is influenced by chemical reactions among gangue components and phase transformation processes under varying tem-perature and atmosphere conditions.Understanding the formation mechanism is crucial for effectively controlling the content of the bonding phase in the sinter;The reduction pathway of calcium ferrite is affected by the composition of the bonding phase,reduction temperature,and atmosphere.However,research on the reduction pathway of qua-ternary composite calcium ferrite is currently lacking.Studying the reduction mechanism is significant for improving the efficiency of iron ore smelting and reducing energy consumption;Gangue materials play a crucial role in the form-ing and reducing calcium ferrite.Elements such as SiO2,Al2O3,and MgO can alter the crystal structure of calcium ferrite and its formation and reduction mechanisms.Finally,based on the current research status of the calcium fer-rite bonding phase,future research directions are proposed.These include exploring effective extraction and compre-hensive utilization of valuable components during sintering,obtaining universal physicochemical data in calcium fer-rite,and investigating related areas.These efforts will contribute to further advancing the theory of iron ore sinte-ring.
ironmakingsinterbonding phasesillico-ferrite of calcium and aluminum(SFCA)research progress
NETL
NSTL
万方数据
