Sulphide capacity of CaO-SiO₂-Al₂O₃-MgO-TiO₂-Fe_tO slag with high titanium and high FeO content based on HIsmelt process

ABSTRACT

The sulphide capacities of CaO-SiO₂-Al₂O₃-MgO-TiO₂-Fe_tO slags with high titanium and Fe_tO were measured by gas-slag equilibration technique to reveal the effect of slag composition and temperature on the sulphide capacities of slags. The results showed that sulphide capacities enhanced with the increase of temperature, basicity, Fe_tO, and MgO contents, TiO₂ content increased first and then decreased in the range of 10 wt-% to 20 wt-%; the influence became negligible as the TiO₂ content exceeded 25 wt-%. MgO significantly increased the sulphide capacities of slag in the range of 6 wt-% to 8 wt-%, continued to increase the MgO content, and the increasing trend of Log C_S became slowly; Fe_tO content increased from 3 wt-% to 9 wt-%, sulphide capacities increased slowly, increased dramatically in the range of 9 wt-% to 15 wt-%. Meanwhile, comparing the optical basicity models found Zhang and Tsao’s models are close to the experimentally determined values.

KEYWORDS:

• Gas-slag equilibrium technique
• sulphide capacity
• optical basicity
• HIsmelt process
• vanadium titanium magnetite

Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 51674122) and the High-end Iron and Steel Metallurgy Joint Fund Project of Hebei Natural Science Foundation (NO. E2020209208).

Disclosure statement

The authors declare no potential conflict of interest.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number No.51674122]; Hebei Natural Science Foundation [grant number No.E2020209208]; Chengde Science and Technology Plan Project [grant number: 202205B060].