（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China 2. Hongxing Iron and Steel Co.， Ltd.， Jiusteel （Group） Co.， Ltd.， Jiayuguan 735100， Gansu， China）
Abstract：In order to further clarify the impact mechanism of MgO on the fluidity and melting property of low-alumina blast furnace slag， the viscosity， melting temperature，the change of liquid region of blast furnace slag and phase change of the slag during cooling process with different[w(MgO)]were studied based on the composition of Jiusteel blast furnace slag through viscosity experiment and the FactSage thermodynamic software. The results show that the slag viscosity and critical melting temperature decrease with the increase of [w(MgO)，]and[w(MgO)]is controlled within 8%， which can meet the requirements of the fluidity of Jiusteel blast furnace slag. The melting interval increases with the increase of[w(MgO).]The liquid phase zone is far away from CaO region and extends to the SiO2 and Al2O3 region. During the cooling process， the increase of[w(MgO)]is favorable for the formation of melilite， but inhibits the formation of wollastonite and pseudo wollastonite.The fluidity of slag at 1 350 ℃ is affected by the polymerization degree of slag structure and the solid phase content in slag. The fluidity of slag above 1 400 ℃ is mainly related to its structure. The melting temperature of low aluminum slag is also mainly determined by the degree of polymerization of the slag structure and the content of magnesium feldspar in the slag.
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