TY - JOUR T2 - Journal of Mining and Metallurgy, Section B: Metallurgy TI - Effect of FeO content on melting characteristics and structure of nickel slag VL - 58 IS - 3 SP - 427 EP - 438 PY - 2022 DA - 27 October 2022 DO - 10.2298/JMMB220317024M UR - https://doi.org/10.2298/JMMB220317024M AU - Ma, Y.-T. AU - Yang, P. AU - Lu, B.-G Dou, Y.-L. AU - Tian, J.-K. AU - Guo, W.-B. AU - Zhang, Z.-Q. AU - Shen, Y.-Y. AD - a Ltd., Jinchang, State Key Laboratory of Comprehensive Utilization of Nickel-Cobalt Resources, Jin chuan Group Co., China; b Lanzhou University of Technology, School of Materials & Science, State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou, China; AB - Nickel smelting produces a large amount of nickel slag which contains a lot of Fe in the form of FeO. The effect of FeO content on the melting properties and structure of nickel slag is investigated by thermodynamic calculations and experiments, using the nickel slag of water quenching furnace as raw material, which is simplified to CaO-SiO2-FeO-MgO slag system. The results are as follows: with increasing FeO content, the precipitated primary phase changes from melilite to olivine. The liquidus temperature, softening temperature, hemispherical temperature, flow temperature, viscosity, and critical viscosity temperature of the slag system tend to decrease gradually, but the solid phase temperature tends to decrease first and then increase. The centre of the symmetric stretching vibration band of the [SiO4]4 tetrahedron -in the slag system shifts to the low wavenumber region. The mole fraction of O0 in the slag continuously decreases, and the mole fraction of O- and O2- increases. The complex silicon-oxygen tetrahedron structure gradually disintegrates and the structural unit tends to be simple. KW - CaO-SiO2-FeO-MgO slag system KW - Nickel slag KW - FeO content KW - Melting properties KW - Structure N1 - Correspondence Address: Y.-Y. Shen; b Lanzhou University of Technology, School of Materials & Science, State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou, China; email: shenyy@lut.edu.cn N1 - J. Min. Metall. Sect. B-Metall., 58 (3) (2022) 427-438. doi:10.2298/JMMB220317024M PB - Technical Faculty in Bor SN - 1450-5339 (ISSN) LA - English J2 - J. Min. Metall. Sect. B Metall. M3 - Article ER -