The influence of SiO2 on bonding phase fluidity was studied by measuring the projected area of tablets prepared using mixtures of fine iron ore and chemical reagents after sintering. The microstructure of samples was ...The influence of SiO2 on bonding phase fluidity was studied by measuring the projected area of tablets prepared using mixtures of fine iron ore and chemical reagents after sintering. The microstructure of samples was observed by optical microscope and SEM. Moreover, the relationship between SiO2 and bonding phase fluidity and microstructure was analyzed by CaO-Fe2O3-SiO2 system 1 300℃ isothermal section diagram. The main experimental conditions are as follows： in the composition of the bonding phase,CaO is 10%, 15% ,and 20%; SiO2 is 2% and 6% ; sintering temperature is 1 250, 1 300 and 1 350 ℃ ; the sample cooling rate is quick. The results of the study show that.① The fluidity of the binding phase decreases with the increase of SiO2 content. Moreover,fluidity increases as the sintering temperature increases; however, when the CaO content is 10% （relatively low proportion）, the lifting temperature has limited effect on fluidity improvement. ② The hematite proportion of the microstructure increases as the SiO2 content increases. ③ When SiO2 content increases, the solid phase ratio in the bonding phase grows,while the liquid phase ratio diminishes. Moreover the extension of the SiO2 content in the liquid phase is larger than that in the solid phase.展开更多
文摘The influence of SiO2 on bonding phase fluidity was studied by measuring the projected area of tablets prepared using mixtures of fine iron ore and chemical reagents after sintering. The microstructure of samples was observed by optical microscope and SEM. Moreover, the relationship between SiO2 and bonding phase fluidity and microstructure was analyzed by CaO-Fe2O3-SiO2 system 1 300℃ isothermal section diagram. The main experimental conditions are as follows： in the composition of the bonding phase,CaO is 10%, 15% ,and 20%; SiO2 is 2% and 6% ; sintering temperature is 1 250, 1 300 and 1 350 ℃ ; the sample cooling rate is quick. The results of the study show that.① The fluidity of the binding phase decreases with the increase of SiO2 content. Moreover,fluidity increases as the sintering temperature increases; however, when the CaO content is 10% （relatively low proportion）, the lifting temperature has limited effect on fluidity improvement. ② The hematite proportion of the microstructure increases as the SiO2 content increases. ③ When SiO2 content increases, the solid phase ratio in the bonding phase grows,while the liquid phase ratio diminishes. Moreover the extension of the SiO2 content in the liquid phase is larger than that in the solid phase.
