Study of high-temperature sintering properties and proportioning optimization of iron concentrates with different w(SiO2)
In this paper,the high-temperature sintering properties such as assimilation performance,liquid phase fluidity,sinter body bonding strength and calcium ferrite generation characteristics of four kinds of iron concentrates with different w(SiO2)from Xinyu Iron & Steel Group Co.,Ltd.were investigated.Based on the findings,the proper proportioning schemes of raw materials including the concentrates were determined to seek optimal sintering performance,with the consideration of on-site production demand.It was found that under the condition of a fixed basicity(1.95),with increasing w(SiO2)in the iron concentrate,the liquid phase generation temperature decreased.Additionally,the liquid phase generation quantity increased significantly,with improved liquid phase fluidity.However,with excessively high w(SiO2),the assimilation performance and the sinter body bonding strength declined.Regulating w(SiO2)would be crucial to the liquid-phase generation characteristics during the sintering process and to the quality of iron ore sinter.The sinter pot tests showed that as the w(SiO2)increased from 3.90％to 3.33％after optimizing the proportions of iron concentrates,the productivity,sinter yield and tumble index of the sinter product were increased by 0.25 t/(m2-h),5.91％and 8.12％,respectively.Meanwhile,the solid fuel consumption was decreased by 5.59 kg/t.The sintering indexes improved considerably.
iron concentratehigh temperature sintering performanceSiO2 contentliquid phaseore proportioning optimization
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