Combined Effect of SiO2 and O2 on the Crystallization Behavior of Modified Ti-Bearing Blast Furnace Slag

Jiqing Han; Jiahao Zhang; Jing Zhang; Xiao Chen; Li Zhang; Ganfeng Tu

doi:10.1021/acsomega.0c00014

Combined Effect of SiO₂ and O₂ on the Crystallization Behavior of Modified Ti-Bearing Blast Furnace Slag

ACS Omega. 2020 Apr 6;5(15):8619-8628. doi: 10.1021/acsomega.0c00014. eCollection 2020 Apr 21.

Authors

Jiqing Han¹, Jiahao Zhang¹, Jing Zhang¹, Xiao Chen², Li Zhang¹, Ganfeng Tu¹

Affiliations

¹ School of Metallurgy, Northeastern University, Shenyang 110819, China.
² School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.

Abstract

FactSage simulation, X-ray diffraction (XRD), and scanning electron microscopy (SEM) coupled to energy-dispersive spectroscopy (EDS) analyses were performed to explore the combined influence of SiO₂ and O₂ on the crystallization behavior of modified Ti-bearing blast furnace slag. The results of FactSage simulation showed that an increase in the added amount of SiO₂ was beneficial to the conversion of Ti-bearing minerals into simple titanium oxides. An increase in oxidation time was conducive to the transformation of low-valent titanium oxides to tetravalent titanium oxide. Therefore, Ti components were precipitated only in the form of rutile under the optimal added amount of SiO₂ (40 g) and the optimum oxidation time (126 s). The results of XRD and SEM analyses were well in agreement with the results of FactSage simulation. Moreover, the mechanism of formation of rutile and glassy phases was discussed.