高锰高铝钢用引流砂烧结反应行为及元素迁移机理

During the steelmaking process of high Mn – high Al steel grades, the low ladle free opening rate caused by the serious sintering of ladle filler sands becomes one of the most important technical problems. Fundamental studies on the sintering of ladle filler sands therefore are urgently required for those steel grades. In order to improve their ladle free opening rate, the present study focuses on the control of the serious sintering of chromite-based filler sands by adding some alumina and zirconium silicate grains into the sands. In the present study, the effect of the alumina and zirconium silicate grains on the sintering behavior of chromite-based filler sands would be investigated, and the reaction mechanism between different sand grains needs to be revealed. Meanwhile, the interaction between the liquid steel and ladle filler sands would be systematically studied, and the influences of the dissolved elements and their contents on the sintering behavior of chromite-based sands would be described. The interfacial reaction mechanism between these elements in steel and the multiphase grains (or sintering products) in the newly-proposed sands would also be further revealed. Besides, the transfer behavior of these elements in the multiphase grains and the sintering products needs to be understood, and its effect on the sintering behavior in between these grains requires to be clarified as well. Based on the study results of the reaction behavior and element transfer during the sintering of filler sands, a direction would be pointed out for the development of the new filler materials used for high Mn – high Al steel grades. This would present its significance in the stable and continuous production of those steel grades in industry.

高锰高铝钢冶炼过程中因引流砂过度烧结而导致浇注钢包自动开浇率低的问题，已成为影响此类钢种稳定生产的难点之一。针对高锰高铝钢用引流砂基础研究相对匮乏的现状，本项目提出将相对稳定的氧化铝和硅酸锆作为新基质进行添加，以此来抑制铬质引流砂的过度烧结，提升高锰高铝钢连铸过程的自动开浇率。通过研究揭示添加氧化铝/硅酸锆对铬质引流砂烧结行为的影响规律，探明氧化铝/硅酸锆与引流砂中基体颗粒间的界面反应行为机理；通过系统研究高锰高铝钢液与引流砂的相互作用行为，揭示钢中元素及含量对铬质引流砂烧结行为的影响规律，以及与新型引流砂颗粒和烧结产物的界面反应机理，阐明各元素在多相颗粒或烧结产物中的迁移行为及其对砂中颗粒间烧结的影响规律。基于引流砂烧结行为及元素迁移机理研究，指明高锰高铝钢专用引流砂的研制方向，对高锰高铝钢实现稳定工业化生产具有重要意义。

高锰高铝钢冶炼过程中因引流砂过度烧结而导致浇注钢包自动开浇率低的问题，已成为影响此类钢种稳定生产的难点之一。针对高锰高铝钢用引流砂基础研究相对匮乏的现状，本项目将氧化铝和硅酸锆作为新基质进行添加到铬质引流砂中，考察其在高锰高铝钢作用下的烧结行为，揭示了硅酸锆和氧化铝与引流砂颗粒间的界面反应行为机理，阐明了钢中元素及含量对新型引流砂颗粒和烧结产物的界面反应机理。研究发现，锆质引流砂（硅酸锆）在无钢液作用下展现出良好的烧结性能，在传统铬质引流砂中额外加入硅酸锆，反而会恶化引流砂的烧结性能。氧化铝和铬铁矿的混合引流砂可以有效抑制钢液中Mn和Al对引流砂的作用，明显减弱引流砂的烧结。研究成果为高锰高铝钢专用引流砂的研制提供了方向，对高锰高铝钢实现稳定工业化生产具有重要意义。项目执行过程中发表学术论文8篇（其中SCI收录5篇），申请和授权发明专利6项，参加学术会议10次（国际会议2次）。