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Effects of Ilmenite Ore on Phase Development of Hematite Ore Sinter
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2020-06-04 , DOI: 10.1007/s11663-020-01856-2 Edson Kugara Chiwandika , Sung-Mo Jung
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2020-06-04 , DOI: 10.1007/s11663-020-01856-2 Edson Kugara Chiwandika , Sung-Mo Jung
The effects of adding 5 to 25 wt pct of ilmenite ore to hematite ore sinter were investigated employing a horizontal tube furnace to clarify the phase development. The temperature was raised nonisothermally at 10 °C/min to 1150 °C in an Ar atmosphere. When the target temperature was reached, 1 L/min of air was injected to allow combustion of the carbon in the pellets. The development of the phases in the sinters was studied using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and electron probe microanalysis (EPMA). The tumbler index (TI) decreased with the increase in ilmenite addition up to 20 wt pct, which increases TiO2 (s) and Fe3O4 (s) content in the sinter blends. Addition of more than 2 wt pct TiO2 (s) to the sinter blends resulted in the formation of perovskite (CaO·TiO2), which affected the development of bonding phases. These changes deteriorated the reduction degradation index (RDI). The estimated melt formation temperature of the sinter blends increased with ilmenite addition up to 15 wt pct and decreased thereafter. An attempt was made to predict the development of phases in the ternary phase diagram of CaO-Fe2O3-TiO2. The reduction behavior of the sinter blends was affected by the type of the bonding phase.
中文翻译:
钛铁矿对赤铁矿烧结矿相发展的影响
使用水平管式炉研究了向赤铁矿烧结矿中添加 5 至 25 重量% 钛铁矿的影响,以澄清相的发展。在 Ar 气氛中,温度以 10 °C/min 的速度非等温升至 1150 °C。当达到目标温度时,以 1 L/min 的速度注入空气以允许颗粒中的碳燃烧。使用 X 射线衍射 (XRD)、能量色散 X 射线光谱 (EDS) 和电子探针微量分析 (EPMA) 研究了烧结体中相的发展。随着钛铁矿添加量增加至 20 wt%,转鼓指数 (TI) 降低,这会增加烧结混合物中 TiO2 (s) 和 Fe3O4 (s) 的含量。向烧结混合物中添加超过 2 wt% 的 TiO2 (s) 导致钙钛矿 (CaO·TiO2) 的形成,这影响了键合相的发展。这些变化使还原退化指数(RDI)恶化。烧结共混物的估计熔体形成温度随钛铁矿添加量增加至 15%(重量百分比),此后降低。尝试预测 CaO-Fe2O3-TiO2 三元相图中相的发展。烧结共混物的还原行为受结合相类型的影响。
更新日期:2020-06-04
中文翻译:
钛铁矿对赤铁矿烧结矿相发展的影响
使用水平管式炉研究了向赤铁矿烧结矿中添加 5 至 25 重量% 钛铁矿的影响,以澄清相的发展。在 Ar 气氛中,温度以 10 °C/min 的速度非等温升至 1150 °C。当达到目标温度时,以 1 L/min 的速度注入空气以允许颗粒中的碳燃烧。使用 X 射线衍射 (XRD)、能量色散 X 射线光谱 (EDS) 和电子探针微量分析 (EPMA) 研究了烧结体中相的发展。随着钛铁矿添加量增加至 20 wt%,转鼓指数 (TI) 降低,这会增加烧结混合物中 TiO2 (s) 和 Fe3O4 (s) 的含量。向烧结混合物中添加超过 2 wt% 的 TiO2 (s) 导致钙钛矿 (CaO·TiO2) 的形成,这影响了键合相的发展。这些变化使还原退化指数(RDI)恶化。烧结共混物的估计熔体形成温度随钛铁矿添加量增加至 15%(重量百分比),此后降低。尝试预测 CaO-Fe2O3-TiO2 三元相图中相的发展。烧结共混物的还原行为受结合相类型的影响。