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-SiO 2 -Al 2 O 3 -MgO-TiO 2 -Fe t O slags with high titanium and Fe t O 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 t O, and MgO contents, TiO 2 content increased first and then decreased in the range of 10 wt-% to 20 wt-%; the influence became negligible as the TiO 2 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 t O 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.

Analysing the HIsmelt process for smelting vanadium–titanium magnetite

“…Carbon emissions from the blast furnace process account for 80% of the total emissions from the steel industry, making carbon reduction from these emissions an important target [4]. Compared to traditional blast furnace ironmaking processes, in a HIsmelt process, iron-containing materials below 6 mm can be used directly, and coal powder with a grain diameter below 3 mm can be injected as a reducing agent into the smelting reduction vessel (SRV) furnace [5][6][7]. The HIsmelt process can eliminate the sintering, pelletizing, and coking processes, thereby significantly reducing the emissions of pollutants and carbon during ironmaking.…”