蒋亮1, 2, 包亦望2, 陈宇红1, Yang Qixing1, 3, 薛同1, 刘贵群1, 韩凤兰1
1 北方民族大学材料科学与工程学院,银川 750021; 2 中国建筑材料科学研究总院绿色建材重点实验室,北京 100024; 3 Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå SE-971 87, Sweden;
Kinetics of the Oxidation Modification Process of CaO-SiO2-FeO-MgO Slag
JIANG Liang1, 2, BAO Yiwang2, CHEN Yuhong1, YANG Qixing1,3, XUE Tong1, LIU Guiqun1, HAN Fenglan1
1 School of Material Science and Engineering, North Minzu University, Yinchuan 750021; 2 China Building MaterialAcademy, Key State Laboratory of Green Building Materials, Beijing 100024; 3 Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Lule? University of Technology, Lule? SE-971 87, Sweden
Abstract: An investigation of mineralogical phases in industrial slag transferred from non-magnetic to magnetic substances was carried out in this study, aiming at extraction of superfluous wustite and stabilization of free lime and free periclase. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were employed to investigate the mineralogy and phase distribution. Wet magnetic separation was conducted to determine the recovery rate of iron. The thermodynamic and kine-tic calculations for the oxidation of steel slag in a CaO-SiO2-FeO-MgO system were also performed, and the results were compared with a CaO-SiO2-FeO system. XRD analysis and SEM-EDS observation confirmed the conversion from non-magnetic wustite to magnetite spinel (magnetite/magnesioferrite) after oxidation. Magnetic separation experiment indicated that the optimal oxidation temperature is 1 100 ℃, which coincided well with the thermodynamic calculations. The addition of periclase had a significant influence on the formation of spinel and leaded to the presence of spinel under a partial pressure of oxygen range log10($P_{o_{2}}$)=4.3 (correspon-ding to air). The oxidation process of steel slag could be divided into three steps: initial incubation, chemical reaction and diffusion.
基金资助: The Project 5 of Sweden CAMM2 (Centre of Advanced Mining and Metallurgy) Work Package 4, WP4(1563365); 宁夏国际合作项目(Grant No. 2013ZYH187); 宁夏科技支撑项目(2014ZYH50)
蒋亮, 包亦望, 陈宇红, Yang Qixing, 薛同, 刘贵群, 韩凤兰. CaO-SiO2-FeO-MgO体系钢渣的氧化改质动力学研究[J]. 《材料导报》期刊社, 2018, 32(4): 650-656.
JIANG Liang, BAO Yiwang, CHEN Yuhong, YANG Qixing, XUE Tong, LIU Guiqun, HAN Fenglan. Kinetics of the Oxidation Modification Process of CaO-SiO2-FeO-MgO Slag. Materials Reports, 2018, 32(4): 650-656.
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2018, Vol. 32 
