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Optimization of Pellet Plant Straight Grate Induration Furnace Firing Cycle for High Alumina and High LOI Iron Ore Pellet
Transactions of the Indian Institute of Metals ( IF 1.5 ) Pub Date : 2022-08-18 , DOI: 10.1007/s12666-022-02707-1
T. Umadevi , K. S. Sridhara , M. Raju , P. Karthik , M. Basavaraja , Rameshwar Sah , Sangamesh Desai

Indian iron ores are suffering from high amounts of alumina and loss on ignition (LOI), which are deleterious constituents in both the pelletizing as well as iron making processes. Iron ore fines utilized in pellet making consist of alumina in the range of 3.20–3.35% and LOI in the range of 3.50–3.70%. Detailed palletization studies have been carried out on high alumina as well as high LOI pellets to improve the properties of the pellet for direct reduced iron making plant (DRI) by optimizing the straight grate induration furnace firing cycle. Preheated and fired pellets were tested for physical and metallurgical properties. Mineralogical studies were carried out using an optical microscope. From the laboratory studies, it was found that under optimum conditions, such as preheating temperature of 1000 °C and preheating time of 2.7 min, roasting temperature of 1300–1310 °C and roasting time of 14.5 min, the roasted pellet properties like tumbler index (T.I) of 94.2%, cold crushing strength (CCS) of 275 kg/p and reduction degradation index (RDI) of 8.5% were achieved due to better coating of slag phase around the hematite grains by improving the fluidity of the melt phase, This led to an increase in the pore density of the pellet by decreasing the bigger size pores. For high alumina and high LOI pellets, the residence time of the existing firing cycle should be increased by 3.7 min (from 39.9 to 43.2 min) and machine speed should be decreased by 0.23 m/min (from 2.91 to 2.68 m/min) to achieve better pellet properties which are suitable for DRI making.



中文翻译:

高铝高LOI铁矿球团直炉排烧结炉烧制周期优化

印度铁矿石正遭受大量氧化铝和烧失量 (LOI) 的困扰,这些都是球团和炼铁过程中的有害成分。球团制造中使用的铁矿石粉由 3.20-3.35% 范围内的氧化铝和 3.50-3.70% 范围内的 LOI 组成。已经对高氧化铝和高 LOI 球团进行了详细的堆垛研究,以通过优化直炉排烧结炉的烧制周期来改善直接还原炼铁厂 (DRI) 球团的性能。对预热和烧制的球团进行物理和冶金性能测试。使用光学显微镜进行矿物学研究。实验室研究发现,在最佳条件下,如预热温度为 1000 ℃,预热时间为 2.7 分钟,焙烧温度为 1300-1310 °C,焙烧时间为 14.5 分钟,焙烧球团特性如转鼓指数 (TI) 为 94.2%,冷压碎强度 (CCS) 为 275 kg/p,还原降解指数 (RDI) 为 8.5%由于通过改善熔体相的流动性而在赤铁矿晶粒周围更好地涂覆渣相,从而通过减小较大尺寸的孔而导致球团的孔密度增加。对于高铝和高 LOI 球团,现有烧制周期的停留时间应增加 3.7 分钟(从 39.9 至 43.2 分钟),机器速度应降低 0.23 米/分钟(从 2.91 至 2.68 米/分钟)至获得更适合直接还原铁制造的颗粒性能。由于通过改善熔体相的流动性在赤铁矿晶粒周围更好地包覆渣相,实现了 275 kg/p 的冷压碎强度 (CCS) 和 8.5% 的还原降解指数 (RDI),这导致了通过减小较大尺寸的孔来提高颗粒的孔密度。对于高铝和高 LOI 球团,现有烧制周期的停留时间应增加 3.7 分钟(从 39.9 至 43.2 分钟),机器速度应降低 0.23 米/分钟(从 2.91 至 2.68 米/分钟)至获得更适合直接还原铁制造的颗粒性能。由于通过改善熔体相的流动性在赤铁矿晶粒周围更好地包覆渣相,实现了 275 kg/p 的冷压碎强度 (CCS) 和 8.5% 的还原降解指数 (RDI),这导致了通过减小较大尺寸的孔来提高颗粒的孔密度。对于高铝和高 LOI 球团,现有烧制周期的停留时间应增加 3.7 分钟(从 39.9 至 43.2 分钟),机器速度应降低 0.23 米/分钟(从 2.91 至 2.68 米/分钟)至获得更适合直接还原铁制造的颗粒性能。这通过减小较大尺寸的孔导致颗粒的孔密度增加。对于高铝和高 LOI 球团,现有烧制周期的停留时间应增加 3.7 分钟(从 39.9 至 43.2 分钟),机器速度应降低 0.23 米/分钟(从 2.91 至 2.68 米/分钟)至获得更适合直接还原铁制造的颗粒性能。这通过减小较大尺寸的孔导致颗粒的孔密度增加。对于高铝和高 LOI 球团,现有烧制周期的停留时间应增加 3.7 分钟(从 39.9 至 43.2 分钟),机器速度应降低 0.23 米/分钟(从 2.91 至 2.68 米/分钟)至获得更适合直接还原铁制造的颗粒性能。

更新日期:2022-08-20
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