摘要
In recent years,composite pellet production with added reductant has been developed instead of traditional iron production.Composite pellets produced by the addition of appropriate proportions of reductant produce sponge iron in the reductant melting process at high temperatures.The elements created in the structure by pellet production directly affect the quality of the product obtained by determining the chemical composition and the appropriate reaction temperature.In this study,sponge iron ore concentrate(scale)and reductant(coke coal dust and sodium bentonite)were mixed at certain proportions to produce composite pellet samples;the effects of addition rate of the reductant material of sodium bentonite(1 wt%−4 wt%)and variation in reaction temperature(900−1200℃)on the metallization and compressive strength properties of the produced composite pellet samples were investigated.The analysis results show that the highest compressive strength is obtained from pellet samples produced with 3%sodium bentonite at 1100℃.Additionally,SEM-EDS analysis results of the samples show that the morphologic structure has much lower porosity rates compared to samples produced under the other conditions which makes the samples denser and increases the metallization properties.
近年来,添加还原剂的复合球体铁生产逐步代替传统的铁生产。在高温下,加入适当比例的还原剂,在其熔化过程中产生海绵铁。通过确定化学成分和适当的反应温度可以获得产品,而球体结构在生产中产生的元素直接影响产品的质量。本研究将海绵铁矿石精矿(等级)和还原剂(焦煤尘和膨润土钠)按一定比例混合制备复合球体样品,研究了膨润土钠还原剂的添加量(1wt%~4wt%)和反应温度变化(900~1200℃)对制备复合球体样品金属化和抗压强度性能的影响。分析结果表明,在1100℃下用3%膨润土钠制备的复核球体样品的抗压强度最高。此外,SEM-EDS分析结果表明,与其他条件下生产的样品相比,本研究制备的材料孔隙率要低得多,样品更致密,其金属化性能得到了提高。
