Abstract
This study analyzes the influence of the slag composition on the extent of EAF hearth refractory wear and especially on the dephosphorization effectiveness (expressed as practical phosphorus distribution between slag and metal ?p). The statistical treatment of plant data from 24 campaigns of EAF was conducted. It was found that increase of %CaO, basicity, CaO/FeO ratio and decrease of %FeO are beneficial both for lining protection and phosphorus removal. FeO content must be optimized. Silica, alumina were low and improved the fluidity. Increasing of %MgO affected the wear positively, but ?p values negatively. Some negative factors could scatter the results.