Preparation of Reduced Iron Powder and Cement Raw Material from Red Mud Using Reduction Roasting with CaO

IF 2.5 3区材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY

Journal of Sustainable Metallurgy Pub Date : 2024-07-12 DOI:10.1007/s40831-024-00868-5

Fuqiang Zheng, Yuqi Zhao, Hongyang Wang, Bin Hu, Chen Liu

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Abstract

Reduction roasting‒magnetic separation was adopted to extract iron in red mud containing 47.45% Fe and 11.58% Al₂O₃. The process mineralogy and phase transformation of red mud during reduction roasting with CaO were studied using advanced mineral identification and characterization system, X-ray diffraction, scanning electron microscope, and energy-dispersive spectrometer. Results show that the main Fe-bearing minerals in red mud are hematite and alumogeothite, with corresponding contents of 47.99% and 37.81%, respectively. After reduction roasting with CaO, red mud is converted into metallic iron and Ca–Al compounds, and the iron grain size increases with roasting temperature. After roasting at 1175 °C for 60 min, the iron grain size reaches 18.85 μm. Under the conditions of grinding size of − 44 μm of 86.57%, and magnetic intensity of 1000 Gs, a concentrate with Fe grade of 90.14% and Fe recovery of 85.68% is obtained. Meanwhile, there are 40.01% of CaO and 23.96% of Al₂O₃ in magnetic tailing, which can be used as cement raw materials. This study lays the foundation for the resource utilization of red mud.

Graphical Abstract

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利用 CaO 还原焙烧从赤泥中制备还原铁粉和水泥原料

采用还原焙烧-磁选法提取含铁 47.45% 和 Al2O3 11.58% 的赤泥中的铁。利用先进的矿物鉴定和表征系统、X 射线衍射、扫描电子显微镜和能量色散光谱仪，研究了赤泥在氧化钙还原焙烧过程中的过程矿物学和相变。结果表明，赤泥中的主要含铁矿物是赤铁矿和赤铝矿，其含量分别为 47.99% 和 37.81%。用 CaO 还原焙烧后，赤泥转化为金属铁和 CaAl 化合物，铁的粒度随焙烧温度的升高而增大。在 1175 °C 下焙烧 60 分钟后，铁的粒度达到 18.85 μm。在磨矿粒度为 - 44 μm 的 86.57% 和磁强为 1000 Gs 的条件下，精矿的铁品位为 90.14%，铁回收率为 85.68%。同时，磁性尾矿中含有 40.01% 的 CaO 和 23.96% 的 Al2O3，可用作水泥原料。该研究为赤泥的资源化利用奠定了基础。图文摘要

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来源期刊

Journal of Sustainable Metallurgy Materials Science-Metals and Alloys

CiteScore

4.00

自引率

12.50%

发文量

151

期刊介绍： Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.