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Fe/SiO 2 Ratio on the Properties, Microstructure and Fe-Containing Phases of Nickel Matte Smelting Slag
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2021-03-11 , DOI: 10.1007/s11663-021-02113-w
Guohua Wang , Yaru Cui , Jian Yang , Xiaoming Li , Shufeng Yang , Junxue Zhao , Hongliang Tang

Due to the poor separability and low reducibility of fayalite in iron extracting from smelting waste slag, the composition of the original slag was modified for the nickel matte smelting process. Based on molecular dynamics simulation, thermodynamic calculation and experimental analyses, the influence mechanism of Fe/SiO2 ratio on physicochemical properties, Fe-containing phases and microstructure of the CaO-modified nickel matte smelting slag was investigated, to improve the FeO activity in the final slag and facilitate the subsequent iron extraction process. The results show that the SiO44− is the main form of silicon-oxygen anions in the FexO-SiO2-CaO-MgO-“NiO” slags. As the Fe/SiO2 ratio increased from 1.0 to 1.6, the fraction of SiO44− (Q0) in 15 wt pct CaO-modified nickel matte smelting slag are remarkably improved, and the degree of polymerization of silicate network is reduced correspondingly. Besides, the CaO-modified nickel slags with the Fe/SiO2 ratios of 1.2 to 1.4 present appropriate melting temperature, viscosity characteristics and interfacial tension between slag and matte. It indicates that the modified nickel slags are suitable candidates for nickel flash matte smelting. The concentration of Mg1−xFexO in 15 wt pct CaO-modified nickel slag is improved with increase of Fe/SiO2 ratio, which is conducive to the iron extraction from the smelting residues subsequently.



中文翻译:

Fe / SiO 2比对镍哑熔渣性能,组织和含铁相的影响

由于从冶炼废渣中提取铁时重铁矿的可分离性差和还原性低,因此将原始矿渣的成分进行了改性,以用于哑光镍冶炼过程。通过分子动力学模拟,热力学计算和实验分析,研究了Fe / SiO 2配比对CaO改性镍哑熔渣的理化性质,含Fe相和微观结构的影响机理,以提高FeO在炉内的FeO活性。最终的渣,并有利于后续的铁提取过程。结果表明,SiO 4 4-是Fe x O-SiO 2 -CaO-MgO-“ NiO”渣中硅氧阴离子的主要形式。作为Fe / SiO 2比例从1.0增加到1.6,显着提高了15 wt%CaO改性的镍哑熔渣中SiO 4 4-Q 0)的比例,相应地降低了硅酸盐网络的聚合度。此外,Fe / SiO 2比为1.2至1.4的CaO改性镍渣具有合适的熔融温度,粘度特性和渣与毛面之间的界面张力。这表明改性的镍渣是镍闪蒸哑光熔炼的合适候选者。随着Fe / SiO 2含量的增加,15wt%CaO改性的镍渣中Mg 1- x Fe x O的浓度提高。 比例,这有利于随后从冶炼残渣中提取铁。

更新日期:2021-03-12
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