Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7899754 | Journal of Non-Crystalline Solids | 2018 | 8 Pages |
Abstract
The viscosity of titanium slag has a crucial effect on the separation efficiency from metallic iron, the foaming extent of slag, and the kinetics of smelting reactions. Properties of slag depend on its microstructures essentially. Molten FeO-TiO2 system was investigated through molecular dynamics simulations to characterize its structural and transport properties at 1973â¯K. With FeO content increasing from 5 to 50%, CNTi-O decreases from 6.02 to 5.87, CNO-Ti decreases from 2.95 to 1.89, and the structural strength of the FeO-TiO2 system is hence reduced. [TiO6] octahedron is only one stable structural unit and is distorted in molten FeO-TiO2 system. [TiO6] octahedrons are connected by two ways: edge-sharing Ti-Ti and corner-sharing Ti-Ti. The edge-sharing Ti-Ti has stronger combining capacity than the corner-sharing Ti-Ti. The structural strength and viscosity of FeO-TiO2 system will be reduced by the transformation from Ti-O-Ti to Fe-O-Ti, which is resulted from the addition of FeO. Furthermore, the self-diffusion coefficients of Fe2+, Ti4+, and O2- follow the order: Fe2+â¯>â¯Ti4+â¯>â¯O2â. With FeO content increasing from 5 to 50%, the viscosity of molten FeO-TiO2 system decreases from 0.1272 to 0.0232â¯Pa·s. The results will contribute to understand and predict the macroscopic properties of high-temperature titanium slag.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Helin Fan, Dengfu Chen, Peng Liu, Huamei Duan, Yunwei Huang, Mujun Long, Tao Liu,