ABSTRACT

Blast furnaces (BF) ferrous burden consist of sinter (>50%) with rest being pellets and lump ore. Good sinter quality is necessary for efficient BF operation which depends on iron ore quality and its gangue. In gangue, alumina has a strong influence that adversely affects product quality and productivity. To address those effects this study presents a two-stage method. It involves the development of a novel low temperature melting synthetic flux i.e. Iron Rich Calcium Ferrite (IRCF) at Stage-1 and its addition in high alumina sinter feed at stage-II. Microstructural and dilatometry studies show that IRCF encourages the formation of silico-ferrite of calcium and aluminum (SFCA-1). The IRCF addition (6% max) in the high alumina (3.1%) sinter feed improves the Tumble index by 4.7 points, lowers the Abrasion index by 2.7 points, and decreases the return fines by 4.4%. Moreover, the Reduction degradation index (RDI) was also improved by 7.9 points.

摘要

高炉 (BF) 铁料由烧结矿 (>50%) 组成，其余为球团矿和块矿。高炉的高效运行需要良好的烧结质量，这取决于铁矿石质量及其脉石。在脉石中，氧化铝具有很强的影响，对产品质量和生产率产生不利影响。为了解决这些影响，本研究提出了一个两阶段的方法。它涉及在第 1 阶段开发一种新型低温熔化合成熔剂，即富铁钙铁氧体 (IRCF)，并在第 II 阶段将其添加到高铝烧结料中。微观结构和膨胀学研究表明，IRCF 促进钙和铝 (SFCA-1) 硅铁酸盐的形成。在高铝 (3.1%) 烧结进料中添加 IRCF（最大 6%）将翻滚指数提高了 4.7 个点，将磨损指数降低了 2.7 个点，并将退货罚款减少 4.4%。此外，还原退化指数（RDI）也提高了7.9分。