Relationship Between Liquid Fluidity of Iron Ore and Generated Liquid Content During Sintering
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nd Yasuo Omori et al. first proposed this concept of fundamental sintering characteristics.[1,2] The fundamental characteristics of iron ore sintering are important in optimizing ore matching. The fluidity of sintering liquid phase is the fluidity of the liquid which is generated by the reaction of iron ore and CaO during sintering.[3-6] The fluidity of sintering liquid phase reflects the effective bonding range in the binder phase. Suitable fluidity of sintering liquid phase could ensure the solid–liquid contact area, thus can obtain sufficient consolidation strength. Generally, the higher the fluidity of sintering liquid phase is, the larger the scope of liquid-bonded materials is. Thus more the non-melt iron ore powder can be bonded, the consolidation of sinter improved. If the fluidity of sintering liquid phase is too low during sintering, the ability of liquid-phase bonding around material reduces, and part iron ore powder cannot be effectively bonded. The yield of sinter declines.[6-9] Different types of iron ore have different properties; therefore, their liquid fluidities during sintering are different.[10-15] The liquid fluidity during sintering can be controlled by appropriate ore matching. Wu et al. and Luo et al. have performed many studies of the basic JUN PENG, Associate Professor, LIE ZHANG, Master Student, and LI-XIA LIU and SHENG-LI AN, Professors, are with the School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Inner Mongolia, Baotou 014010, China. Contact e-mails: [email protected] and [email protected]. Manuscript submitted March 15, 2016. Article published online November 28, 2016. 538—VOLUME 48B, FEBRUARY 2017
characteristics of many single and mixed ores and have achieved good results in the optimization of sintering ore matching.[15-22] However, there have been few studies of the relationship between the fundamental sintering characteristics and the thermodynamic equilibrium phase in sintering. In this study, simulations of the liquid fluidity index experiments conducted by Wu et al. were carried out to clarify the relationship between the liquid fluidity index and thermodynamic equilibrium phases.
II. EXPERIMENT AND THERMODYNAMIC EQUILIBRIUM CALCULATION FOR IRON ORE DURING SINTERING A. Experiment Introduction The fluidity index of liquid phase measured experimental method is as follows: firstly, iron ore and CaO were mixed and compressed as a single Table I at 10 Mpa.[12,13] The tablet size is u8 mm95 mm. In sequence, the tablet was sent to an infrared heating furnace. The tablet was heated from room temperature to 873 K (600 °C) for 4 minutes, form 873 K (600 °C) to 1273 K (1000 °C) for 1 minutes, from 1273 K (1000 °C) to 1423 K (1150 °C) for 1.5 minutes, from 1423 K (1150 °C) to 1553 K (1280 °C) for 1 minute, and heat 4 minute at 1553 K (1280 °C). Then, the tablet cooled from 1553 K (1280 °C) to 1423 K (1150 °C) for 2 minutes, from 1423 K (1150 °C) to 1273 K (1000 °C) for 1.5 minutes, finally furnace cooling.[13] During experimental process, airflow with flux is 4L/min, nitrog
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