基于多组分交互作用规律的钒钛烧结矿物相重构及液相行为机理研究

Usually the softening and dropping behavior of iron ore is divided into reduction, softening, melting, dripping four processes，and every process is studied separately。In fact,the softening and dropping behavior of iron ore is the process that the liquid phase generating from solid phase and the solid phase continuously transforming to the liquid phase. So, reduction, softening, melting, dripping should be regarded as associated entirety to study as a whole. The softening,melting and dropping mechanism of vanadium-titanium sinter is systematacially and integrallty analyzed by means of metallurgical physical chemistry, process mineralogy and image analysis, combining with modern test technology. Firstly, the interaction law of multi-components such as CaO, TiO2, FeO, SiO2 et al in the reduction process of vanadium-titanium sinter is studied ,according to the reaction thermodynamics; and then, the mechanism of the liquid behavior in the process of softening and dripping of vanadium-titanium sinter is studied , including the complete process of liquid generating, developing, dripping; Finally, the mechanism of the mineral phase reconstruction in the process of softening and dripping of vanadium-titanium sinter is studied , including the migration of vanadium titanium element, carburization reaction ,iron and slag melting separation. Eventually hope to explain difference of softening and dripping between vanadium-titanium sinter and ordinary sinter, provide theoretical foundation and technical support for blast furnace stably, efficiently, reasonably smelting vanadium-titanium sinter.

通常铁矿石软熔滴落行为分成还原、软化、熔融、滴落四个过程分别研究，而实际上铁矿石软熔滴落过程是从固相中生成液相，固相不断向液相转变的过程。因此，应将还原、软化、熔融、滴落视为前后联系的统一整体加以研究。本课题借鉴国外先进的实验手段与思路，采用冶金物理化学、工艺矿物学、图像分析和现代测试技术相结合的研究方法，系统、完整的分析钒钛烧结矿软熔滴落行为机理。首先根据反应热力学研究钒钛烧结矿还原过程中等CaO、TiO2 、FeO、SiO2组分的交互作用规律；然后研究钒钛烧结矿软熔滴落过程中液相行为机理，包括液相生成、发展、滴落的完整过程；最后研究钒钛烧结矿软熔滴落过程中物相重构机制，包括钒钛元素的迁移，渗碳反应及渣铁的熔化分离。 最终解释钒钛烧结矿与普通烧结矿软熔滴落行为存在差异的原因, 为高炉稳定、高效、合理地冶炼钒钛烧结矿提供理论基础和技术支撑。

通常铁矿石软熔滴落行为分成还原、软化、熔融、滴落四个过程分别研究，而实际上铁矿石软熔滴落过程是从固相中生成液相，固相不断向液相转变的过程。本项目试图将还原、软化、熔融、滴落视为前后联系的统一整体加以研究，系统、完整的分析钒钛烧结矿软熔滴落行为机理。本项目首先对钒钛烧结矿和普通烧结矿进行了系统的对比研究，证实钒钛烧结矿和普通烧结矿在冶金性能方面存在显著差异；然后同借助多种检测手段，研究钒钛烧结矿还原过程中发生的微观结构，物相组成变化，完善钒钛烧结矿还原反应机理和元素迁移规律；并利用热力学计算软件factsage研究钒钛烧结矿液相生成过程，分析液相生成量与料柱变形量和压差变化值的关系，揭示钒钛烧结矿软化、熔融行为机理；最后利用粘度测定仪对碱度、FeO 含量和 TiO2 含量对含钛高炉初渣粘度进行了研究，揭示烧结矿滴落行为机理。通过以上研究能够为高炉稳定、高效、合理地冶炼钒钛烧结矿提供理论基础和技术支撑。基本完成了研究内容，实现了研究目标。通过本项目发表学术论文6篇，会议论文1篇，培养硕士研究生2名，指导3名本科生完成大学生创新创业项目1项。项目投入直接经费20万元，支出18.718万元，各项支出基本与预算相符，剩余经费1.282万元，剩余经费计划用于本项目的后续研究。