Effect of dolomite on reduction swelling property of iron ore pellets

The effect of various dosages of dolomites on the reduction swelling property of iron ore pellets was studied. Experimental results show that the reduction swelling index(RSI) decreases from 13.35% to 4.0%, while the porosity of roasted pellets increases from 35% to 40% with increasing the dolomite dosage from 0 to 10.5%. Meanwhile, the content of magnesium ferrite with high melting temperature, as well as the stability of magnetite(Fe3 O4) in the roasted pellets, increases with increasing the magnesium oxide(MgO) content from dolomite. The reasons for the decrease of RSI rely on the absence of crystal transformation from Fe2 O3 to Fe3 O4, the increased porosity of roasted pellet, and the suppression of phase transition of 2CaO·SiO2 resulted from the incorporation of magnesium into calcium silicate.     

武钢一烧成本日日清系统在节能降耗中的应用

武钢一烧车间自主开发了一套成本日日清系统，并将其运用于烧结生产实践中。结果表明，通过对烧结能源介质实时跟踪与动态化管理，实现了2011年固体燃料、煤气、电力的平均消耗分别比目标值下降4．14kg／t、3．65MJ／t与4．70kwh／t的效果。     

精益管理在提高烧结矿产质量上的应用

武钢一烧车间将精益管理与烧结生产实践相结合,通过改善混合料的化学成分的稳定性和粒度组成,使烧结矿实物产质量得到显著提高,台时产量和烧结矿的转鼓强度分别达到492.13t/h和79.73%的良好水平,为高炉高产、低耗奠定了坚实的基础。