|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Materials Processing Fundamentals
||Considerations of Removing Arsenic from Molten Steel by Adding Rare Earth Elements
||Peng Yu, Wang Hongpo, Jiang Silu
|On-Site Speaker (Planned)
Cleanliness control in steel has always been a topic discussed by researchers. Many methods were used to remove residual elements from steel. Adding rare earth elements to molten steel is one of the potential ways. However, to remove arsenic from steel using lanthanum, many issues need considerations. The effects of steel-crucible reactions, vaporation, and slags on the removal of arsenic from the molten steel were investigated. The results show that using the alumina crucible is more conducive to removing arsenic from the molten steel by rare earth elements, because LaAlO3 can inhibit the further reactions between lanthanum and the crucible. Magnesia crucible, however, does not have similar effects. BN crucibles drop powders and decrease the cleanliness of steel. Besides, when the concentration of arsenic is low, arsenic can be barely removed by volatilizing under normal pressure. Futhermore, due to the existence of the interfacial tension, the molten slag is easy to separate from the molten steel and makes the fluidity of slag become worse. Although the molten slag can remove arsenic from the molten steel to some extent, it also have harmful effects in crucible-scale experiments.
||High-Temperature Materials, Magnetic Materials, Surface Modification and Coatings