Millions of tons of red mud produced as a by-product of the alumina industry by Bayer process not only threatens the environment but also causes waste of secondary resources. To recover iron from red mud, the technology of reduction roasting-magnetic separation to treat high-iron red mud was developed; however, it was difficult to upgrade by separating iron and alumina. In this paper, the effects of high-manganese iron ore on the direct reduction process of high-iron red mud were investigated through various tests such as reduction temperature, reduction time, C/Fe mass ratio, and addition amount of high-manganese iron ore. The results showed that the metallization rate of the direct reduction of high-iron red mud reaches 84.07% roasting at 1150 °C, 150 min and C/Fe mass ratio of 2.0. By synergistic reducing with 60% high-manganese iron ore, the metallization rate increased to 93.52%. The results of phase and microstructure evolution analysis showed that adding high-manganese iron ore, the content of ilmenite, hercynite and fayalite were reduced, and pyrophanite, galaxite and tephroite were formed, indicating that MnO, one of the reduction products of high-manganese iron ore, can react with ilmenite, hercynite and fayalite to generate pyrophanite, galaxite and tephroite in the reduction process, and further dissociated FeO, which was conducive to the reduction of high-iron red mud.

拜耳法氧化铝工业副产品产生的数百万吨赤泥不仅对环境构成威胁，而且造成二次资源的浪费。为从赤泥中回收铁，开发了还原焙烧-磁选处理高铁赤泥的技术；然而，很难通过分离铁和氧化铝来升级。本文通过还原温度、还原时间、C/Fe质量比、高锰铁添加量等多种试验研究了高锰铁矿对高铁赤泥直接还原工艺的影响。矿石。结果表明，在1150℃、150min、C/Fe质量比为2.0的条件下，直接还原高铁赤泥的金属化率达到84.07%。通过与60%高锰铁矿协同还原，金属化率提高到93.52%。物相和微观结构演化分析结果表明，加入高锰铁矿后，钛铁矿、菱铁矿和铁橄榄石的含量降低，形成了焦闪石、方铅矿和温黄铁矿，说明高锰矿的还原产物之一MnO铁矿石在还原过程中可与钛铁矿、菱铁矿和铁橄榄石反应生成焦磷铁矿、方解石和云铁矿，并进一步离解FeO，有利于高铁赤泥的还原。