|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Late News Poster Session
||N-21: Dephosphorization of Iron Ore Containing Phosphorus
||Hirokazu Konishi, Shuna Kushibe, Yuichiro Koizumi, Osamu Ishiyama, Kenichi Higuchi
|On-Site Speaker (Planned)
Iron ore grade becomes lower year by year. Especially, phosphorus as an impurity in Australian iron ore are increasing. In the steelmaking process, several methods of dephosphorization have been in practical use, such as distribution to the slag phase and vacuum degassing. However, the dissolved phosphorus cannot be completely removed, and it is finally dispersed uniformly in the solid phase. Trace amounts of phosphorus segregate in steel and induce crack. So, we investigated the dephosphorization of iron ore containing phosphorus. As the first step, partial pressure of P2 is estimated from equilibrium reaction of H2 and CO reduction of Ca3(PO4)2, FePO4, P4O10 under 1273 K. Secondly, dephosphorization was conducted at 973-1373 K under H2-CO2-N2 gases atmosphere. As a result, dephosphorization could be achieved. The ratio of dephosphorization at 1173 K for 6 h became 76%.
||Iron and Steel, Pyrometallurgy, Recycling and Secondary Recovery