Reducing MgO Content of Blast Furnace Slag

In order to improve technical and economic indexes of ironmaking (BF), metallurgical propertiesMetallurgical property of blast furnace slagBlast furnace slag with low (MgO) were studied systematically based on the laboratorial and industrial tests. The results showed the melting temperature of blast furnace slagBlast furnace slag with 4–7% MgO was lower than 1350 °C under the condition of low Al2O3 content. The viscosityViscosity of the slag met the requirement of blast furnace smelting when the temperature of slag was 1500 °C and the MgO contentMgO content was higher than 3%. The best basicityBasicity of the slag was about 1.245. In the industrial test, the MgO contentMgO content and the viscosityViscosity of the blast furnace slagBlast furnace slag were maintained in the ranges of 4.5–5.0% and 0.16–0.2 Pa s, respectively. The slag with low MgO had good desulfurizationDesulfurization capacity by regulating slag basicityBasicity.