基于热力学计算的高炉高Al₂O₃渣系合理组成的解析

Research on the Reasonable Composition of High Al₂O₃ Slag in the Blast Furnace Based on Thermodynamic Calculation

摘要: 在高含量A12O3铁矿石使用量不断升高，高炉渣中A12O3含量超过传统炼铁15%极限值，从而影响炉渣的流动性和稳定性的背景下，本文采用理论的方法，考察了高含量A12O3铁矿石对炼铁炉料成分及炉终渣成分的影响，探讨了A12O3含量对炉渣性质影响的规律；并以CaO-SiO2-A12O3-MgO四元系终渣为研究对象，应用FactSage热力学软件理论解析综合炉料终渣中A12O3对其熔化温度和粘度的影响，并对其渣相组成进行优化，为深入研究高A12O3铁矿石条件下高铝渣改性方法提供理论基础和技术依据。

Abstract: Under the background of rising usage of high Al2O3 content iron ore, the Al2O3 content in the blast furnace slag has been over 15% of the limit that is given in the traditional iron making. Besides, both the stability and liquidity of the slag will be worse with high Al2O3 content. This paper, combining with the relevant research results at home and abroad, investigates the influence of the changed furnace burden composition with high Al2O3 content on the slag composition from the theoretical analysis. It also uses CaO-SiO2-A12O3-MgO as the research object and applies thermodynamic software FactSage to study the influence of Al2O3 inthe blast furnace slag on liquidus temperature and viscosity of the slag theoretically. All of these are intend to offer theoretical and technical basis for modification methods on which high Al2O3 iron ore is being used.