铝业高铁赤泥用作炼钢冷却剂/造渣剂/脱磷剂的应用基础研究

我国氧化铝工业的飞速发展带来大量赤泥产生。高铁赤泥含有丰富的铁资源，理应是钢铁企业的理想原材料，极少数企业应用于烧结/球团工序，消耗量非常有限。鉴于其强氧化性和高碱性特点，提出在炼钢过程使用高铁赤泥作为冷却剂/造渣剂/脱磷剂的工艺思路。转炉中加入高铁赤泥后与传统操作的最大不同是形成了CaO-SiO2-ΣFeO-Al2O3-Na2O(-MgO)渣系。主要内容：研究以上渣系的熔化流动性能及脱/固磷能力，掌握Al2O3、Na2O的交互影响机理，寻求最低FeO含量的优化参数；研究石灰在以上渣系中的溶解行为；研究以上渣系与Fe-C-Ti/Al/S熔体之间的多元多相反应机理，明晰高铁赤泥的使用对钢水洁净度的潜在影响以及对不同钢种的适用范围；通过热态模拟实验研究，并结合流程物料及能量平衡分析，探讨使用高铁赤泥后转炉的配料模式与成渣路线、造渣制度等之间的联动配合机制，形成可行的工艺技术原理示范。

A large amount of red mud has been being produced due to the rapid development of alumina industry in China. Since some red mud is rich in Fe resources, it reasonably should become the ideal raw materials of ironmaking and steelmaking industries. However, presently only a little red mud was used in sinter/ agglomeration procedure and the consuming amount is extremely limited, which is mainly caused by the serious vaporization of Na2O. Actually, the strong basic and oxidizing properties of highly Fe-bearing red mud are very useful in steelmaking process. In this research, a technical way was proposed during which the highly Fe-bearing red mud was used in BOF steelmaking process as cooling/fluxing/dephosphorization agents. For BOF operation, the biggest difference led by the application of red mud tends to be the formation of CaO-SiO2-?FeO-Al2O3-Na2O(-MgO) slag system instead of CaO-SiO2-?FeO. The main contents of this project include: to study the fluidity and dephosphozing ability of the slag above, and to get the interaction influencing mechanism of Al2O3 & Na2O, and find the optimized indexes for minimizing FeO content in slag; to investigate the dissolution behaviors of lime into the slag and the related kinetic information; to reveal the multiphase interacting mechanism between the slag above and Fe-C-Ti/Al/S melts in order to clarify the potential influence of red mud on the cleanness of steel; through thermal state experiments together with the help of mass and materials balance analysis, to study the burden pattern, slagging system, oxygen supplying and their combining principle in BOF process, and to form a technically practicable demonstration for the case of applying red mud in BOF process.