高铝铁矿和高锰铁矿共还原行为的研究

发布时间：2018-05-29 02:47

本文选题：高铝铁矿 + 高锰铁矿　；参考：《材料与冶金学报》2017年01期

【摘要】：高铝铁矿和高锰铁矿是两种储量丰富但又极难分选的铁矿资源,实现铁、锰、铝的高效综合利用具有重要意义.本文研究了这两种铁矿石工艺矿物学,考查了单矿种及两者的混合矿种的直接还原行为及还原过程中的矿物组成演变,揭示了相应的还原机理.结果表明:高铝铁矿难还原,其机理为经还原后仅部分铁氧化物转化为金属铁,其余的铁与铝、硅矿物形成难还原的铁橄榄石和铁尖晶石;高锰铁矿易还原,其中的铁氧化物大部分被还原成金属铁,锰氧化物与铝、硅矿物结合形成锰尖晶石和锰橄榄石,促进了铁氧化物的还原.而且在相同还原条件下,高锰铁矿球团金属化率比高铝铁矿高30个百分点,前者还原性明显优于后者.两种矿进行共还原,当高锰铁矿配比达到60%时,球团金属化率就可大于90%.锰氧化物的存在对高铝铁矿石中铁氧化物的还原具有显著的促进作用.
[Abstract]:High alumina iron ore and high manganese iron ore are two kinds of iron ore resources which are rich in reserves but difficult to separate. It is of great significance to realize the efficient comprehensive utilization of iron, manganese and aluminum. In this paper, the mineralogy of these two iron ore processes is studied. The direct reduction behavior and the mineral composition evolution during the reduction process of single ore and their mixture are investigated, and the corresponding reduction mechanism is revealed. The results show that the mechanism of refractory reduction of high alumina iron ore is that only part of iron oxide is transformed into metal iron after reduction, and other iron and aluminum minerals form iron-olivine and ferric spinel which are difficult to be reduced, and high manganese iron ore is easy to be reduced. Most of the iron oxides were reduced to metal iron, manganese oxides combined with aluminum and silicon minerals to form manganese spinel and manganese olivine, which promoted the reduction of iron oxides. Under the same reduction conditions, the metallization rate of high manganese ore pellets is 30% higher than that of high alumina iron ore, and the former is obviously superior to the latter. When the ratio of high manganese iron ore reaches 60, the pellet metallization rate can be greater than 90. The existence of manganese oxide can promote the reduction of iron oxide in high alumina iron ore.
【作者单位】：中南大学资源加工与生物工程学院;武汉科技大学资源与环境工程学院;
【基金】：科技部支撑计划项目(2013BAB03B04);科技部火炬计划项目(2011GH561685) 湖南省2011协同创新计划资助项目
【分类号】：TD951

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