CaO-SiO<sub>2</sub>-FeO-MgO体系钢渣的氧化改质动力学研究

doi:10.11896/j.issn.1005-023X.2018.04.029

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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.

Key words： spinel steel slag oxidation thermodynamics kinetics

Published: 25 February 2018

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	Articles by authors
	JIANG Liang
	BAO Yiwang
	CHEN Yuhong
	YANG Qixing
	XUE Tong
	LIU Guiqun
	HAN Fenglan

Cite this article:

JIANG Liang,BAO Yiwang,CHEN Yuhong, et al. Kinetics of the Oxidation Modification Process of CaO-SiO₂-FeO-MgO Slag[J]. Materials Reports, 2018, 32(4): 650-656.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.04.029 OR http://www.mater-rep.com/EN/Y2018/V32/I4/650

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