The present research work deals with the effective utilization of hematite ore containing goethite, kaolinite and gibbsite loss-on-ignition (LOI) phases in pellet making without deteriorating product pellet properties by optimizing the induration cycle especially drying and preheating of pellets. Adequate drying and preheating of pellets before sintering is of prime importance to sustain the desired properties of pellets. Green pellets of + 8 to − 16 mm size were prepared in a laboratory disc pelletizer and indurated by varying drying and preheating temperatures in a laboratory Raising Hearth Furnace (RHF). Produced pellets were assessed for physical and metallurgical properties. Improvement in drying and preheating temperature simultaneously helped in mitigating fired pellets’ property deterioration. Drying at 300 °C and preheating at 750 °C helped in the maximum removal of matrix LOI from the pellets before firing and enabled the production of pellets of desired properties. Laboratory scale findings successfully implemented at existing 4.2 MTPA capacity pellet plant of JSW Steel Ltd. Vijayanagar and high LOI iron ores (IOs) utilised which resulted in reduction of average monthly pellet fines generation by ~2 wt. %.

目前的研究工作是通过优化硬化周期，特别是球团的干燥和预热，在不降低产品球团性能的情况下，有效利用含有针铁矿、高岭石和三水铝石烧失量 (LOI) 相的赤铁矿。在烧结前充分干燥和预热颗粒对于维持颗粒的所需性能至关重要。在实验室圆盘造粒机中制备 + 8 至 - 16 mm 大小的生球团，并通过在实验室竖炉 (RHF) 中改变干燥和预热温度进行硬化。对生产的球团进行物理和冶金性能评估。同时提高干燥和预热温度有助于减轻烧制颗粒的性能劣化。在 300 °C 干燥和在 750 °C 预热有助于在烧制前最大限度地从颗粒中去除基质 LOI，并能够生产具有所需性能的颗粒。在 JSW Steel Ltd. Vijayanagar 现有的 4.2 MTPA 产能球团厂成功实施实验室规模研究结果，并利用高 LOI 铁矿石 (IO)，导致平均每月球团细粉产量减少约 2 wt. %。