Phase Relation of CaO-Al2O3-FetO-P2O5 Slag and Phosphorus Distribution between This Slag and Liquid Iron

Abstract

Amount of steelmaking slag emission is increasing due to strong demand for high quality steel. Development of slag and process that call remove impurity at high efficiency is required to decrease slag discharge volume. Phosphorus is a typical impurity in steel and it can be removed by slag with high CaO and FetO activity. CaO-FetO-P2O5 system has two liquid phase region that has CaO and FetO high activity. It was confirmed that CaO-MgO-FetO-P2O5 two liquid phase slag can remove phosphorus at high efficient in the previous work. The phase relation and ability of phosphorus removal by CaO-Al2O3-FetO-P2O5 system was investigated in the present work.