利用攀西铁矿制备微合金铁粉的中试生产

Pilot-scale preparation production of micro-alloy iron powder using Panxi iron ore

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。

To reduce the production cost of reduced iron powder and improve its performance,the pilot scale production was carried out to continuously prepare micro-alloy iron powder using Panxi iron ore. By strictly controlling the quality and stability of the direct reduction iron and the first reduction iron powder,adopting the catalytic reduction process of grinding separation-fine reduction,and constantly optimizing the process in practice,the adverse effects of low grade and high gangue content in Panxi iron ore on the quality and stability of micro-alloy iron powder were effectively remedied. The results of pilot scale production practice showed that under the condition of w（TFe） 〈 60. 0 %,w（Si O2） 〉 2. 0 % and w（Al2O3） 〉1. 5 %,the micro-alloy iron powder with the hydrogen loss less than 0. 20 %,w（C） 〈 0. 020 %,w（S）〈 0. 030 %,w（TFe） 〉 98. 5 % and the metallization rate bigger than 99. 0 % could be produced on batch. At the same time,the methods to reduce the damage of the harmful elements on steel belt furnace profile and stabilize reduction atmosphere were found. The production cost was decreased significantly.