CaO-SiO2-FeO-Cr2O3基炉渣冶金性能演变规律及调控机理研究

采用高炉-转炉流程冶炼高铬型钒钛磁铁矿时，将会得到钒/铬渣和含铬铁水（半钢）中间产品。当使用转炉进一步冶炼含铬半钢时，炉渣中的Cr2O3将使得转炉初期化渣慢、造渣困难、中后期喷溅及钢铁料损失严重。本项目以CaO-SiO2-FeO-Cr2O3基熔渣为研究对象，采用理论分析、数值模拟和高温实验相结合的研究方法，研究CaO-SiO2-FeO-Cr2O3基熔渣的凝固行为、熔体结构及黏度等物理化学性质，探明其流变特性的变化规律；研究石灰-熔渣界面结构的演变行为和Cr2O3对石灰-熔渣界面处Ca、Fe、P等元素分布规律的影响，明确促进石灰溶解和实现含铬铁水高效脱磷的调控机理；结合CaO-SiO2-FeO-Cr2O3渣的流变特性和表面性质，探索熔渣发泡性能的变化行为及调控措施，为转炉冶炼含铬铁水过程中熔渣冶金性能的调控机理提供理论参考。

When the vanadium titanium magnetite containing high chromium is smelted based on the BF-BOF process, the intermediate products, a vanadium/chromium slag and a semi-steel containing chromium, will be collected. Furthermore, when the converter is used to smelting the semi-steel, the Cr2O3 in the slag will cause the converter to melt the slag slowly in the early stage, make slag difficult, spray in the middle and later stage and loss the steel material seriously. This project will take the CaO-SiO2-FeO-Cr2O3 base slag as the object, and adopt the theoretical analysis, numerical simulation and high temperature experiment to study the solidification behavior, melt structure and viscosity of the CaO-SiO2-FeO-Cr2O3 system, in order to explore the changes of the rheological characteristics. The evolution behavior of the lime-slag interface structure and the influence of Cr2O3 on the distribution of Ca, Fe and P elements at lime-slag interface were investigated. Based on the rheological properties and surface properties of CaO-SiO2-FeO-Cr2O3 slag, the changing behavior and regulation measures of the foaming property of the slag were explored. The results can provide a theoretical reference for the regulation mechanism of metallurgical properties of the molten slag in the process of smelting semi-steel containing chromium in converter.