Self-magnetization reaction behavior and regulation of siderite
HAN Yuexin1,2,3, ZHOU Tingbo1,3, GAO Peng1,2,3, SUN Yongsheng1,2,3, LI Pengchao1,3
1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China; 2. National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang 110819, Liaoning, China; 3. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：China is rich in siderite resources, but the ore grade is low and the endowment is poor. Limited by traditional sorting technology and cost, the overall utilization rate is low. The product ferrous oxide after siderite decomposition is unstable, easy to be oxidized to magnetite by product CO2, and "self-magnetization" reaction occurs. The behavior and regulation of self-magnetization under air, N2 and CO2 atmosphere systems were systematically studied with siderite as the research object, and the influence of roasting temperature, roasting time and CO2 concentration on roasted products and sorting indexes was investigated. The phase transformation, magnetism and microstructure evolution of siderite during self magnetization roasting were investigated by means of XRD, VSM and SEM-EDS, and the reaction mechanism of self magnetization phase transformation of siderite was clarified. The results showed that siderite was transformed into hematite from the edges and cracks of the particles under air atmosphere, and there were a large number of cracks in the particles after roasting, the structure was loose, and the maximum specific magnetic susceptibility coefficient of roasted products was 1.90×10-5 m3/kg. Siderite formed wustite inside the particles under N2 atmosphere, and then transformed into magnetite, and the cracks continued to develop, and finally showed the form of wustite, magnetite and siderite mixed with each other, the particles were loose and porous, and the maximum specific magnetic susceptibility coefficient of roasting products was 47.98×10-5 m3/kg. Siderite is converted into magnetite from the edges and cracks of particles under CO2 atmosphere, and cracks are spread over the surface of particles after roasting, forming a porosity structure, and the maximum specific magnetic susceptibility coefficient of roasted products is 94.59×10-5 m3/kg. Under the conditions of the volume percent of CO2 of 15%, roasting temperature of 700 ℃ and roasting time of 20 min, iron concentrate grade of 59.50% and iron recovery rate of 85.23% can be obtained.
韩跃新, 周廷波, 高鹏, 孙永升, 李朋超. 菱铁矿自磁化反应行为及调控机理[J]. 钢铁, 2023, 58(9): 69-80.
HAN Yuexin, ZHOU Tingbo, GAO Peng, SUN Yongsheng, LI Pengchao. Self-magnetization reaction behavior and regulation of siderite[J]. Iron and Steel, 2023, 58(9): 69-80.
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2023, Vol. 58 
