Abstract Low grade iron-bearing manganese ore is a potential solid waste resource. In this study, an innovative technology of suspension reductive roasting and magnetic separation (SRMS) was used to treat the iron-bearing manganese ore for comprehensive recovery of iron and manganese. The phase transformation of minerals in roasting process was systematically investigated by X-ray diffraction analyzer (XRD) and high-resolution transmission electronic microscope (HRTEM). The results show under the optimum conditions of reduction temperature 680 °C, reduction time 30 min, CO concentration 20% and particle size −0.9 mm, iron concentrate with iron grade 67.38% and iron recovery 87.14% and manganese concentrate with manganese grade 30.51% and manganese recovery 87.02% were obtained respectively. Magnetite converted from hematite was enriched in the concentrate of magnetic separation, while manganosite transformed from pyrolusite and braunite was enriched in the tailings of magnetic separation. SRMS can achieve full component utilization of iron-bearing manganese without residues.

中文翻译：

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从低品位含铁锰矿中全组分回收铁和锰的创新技术

摘要 低品位含铁锰矿是一种潜在的固体废物资源。本研究采用悬浮还原焙烧磁选（SRMS）创新技术处理含铁锰矿，实现铁锰综合回收。采用X射线衍射仪(XRD)和高分辨透射电子显微镜(HRTEM)系统研究了矿物在焙烧过程中的相变。结果表明，在还原温度680℃、还原时间30min、CO浓度20%、粒径-0.9 mm的最佳条件下，铁品位67.38%、铁回收率87.14%、锰品位30.51%的锰精矿和锰回收率分别为87.02%。赤铁矿转化的磁铁矿在磁选精矿中富集，而软锰矿和布劳恩石转化的锰铁矿在磁选尾矿中富集。SRMS可以实现含铁锰的全成分利用，无残留。