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为了降低还原铁粉生产成本并改善其性能,开展了利用攀西铁矿连续制备微合金铁粉的中试生产。通过严格控制直接还原铁料和一次铁粉的质量及稳定性,采取催化还原—磨选—精还原工艺流程,并在实践中不断优化流程,有效弥补了攀西低品位、高脉石铁矿对制备微合金铁粉品质及稳定性带来的不利影响。中试生产表明:在w(TFe)<60.0%、w(Si O2)>2.0%、w(Al2O3)>1.5%条件下,可以批量得到氢损小于0.20%、w(C)<0.020%、w(S)<0.030%、w(TFe)>98.5%、金属化率大于99.0%的微合金铁粉。同时,找到了降低有害元素对钢带炉炉型危害以及稳定还原气氛的方法,加工成本显著降低。
In order to reduce the production cost of reduced iron and improve its performance, pilot production of continuous preparation of microalloyed iron with Panxi iron ore has been carried out. By strictly controlling the quality and stability of direct reduced iron and primary iron, the process of catalytic reduction, grinding and fine reduction was adopted and the process was continuously optimized in practice, effectively compensating for the low grade and high veinstone iron ore in Panxi Adverse effect on the quality and stability of the prepared microalloyed iron powder. The pilot production showed that hydrogen loss less than 0.20%, w (C) <0.020% can be obtained in batches under conditions of TFe <60.0%, w (Si O2)> 2.0% and w w (S) <0.030%, w (TFe)> 98.5%, and the metallization rate is more than 99.0%. At the same time, we found a way to reduce the harmful elements on the furnace belt furnace type and stable reducing atmosphere, processing costs significantly reduced.