一种研究烧结过程中铁矿粉高温特性的方法.pdfVIP

一种研究烧结过程中铁矿粉高温特性的方法 裴元东 赵志星 班丽丽 史学星 马泽军 （首钢技术研究院，北京 100043 ） 摘 要 高温激光共焦显微镜（CLSM ）能够动态观察熔化过程，目前在国内外的钢铁冶金研究中被广泛使用，但 主要集中在炼钢、材料方面。本文针对铁矿粉烧结过程，使用 CLSM 对烧结原料——铁矿粉的熔化固结过程进行 了研究。通过直接观察高温状态下铁矿粉与熔剂的反应，结合差热-热重测试，研究了铁矿粉的高温特性。在模拟 烧结温度制备条件下，矿粉试样在高温下呈现先收缩后扩展（扩散）的移动现象，收缩主要是由于固相烧结和矿粉 排出气孔造成的，分析和讨论了铁矿粉在烧结过程中液相形成、液相发展和液相固结的特性。 关键词 铁矿粉 烧结 高温特性 高温共焦显微镜 原位观察 热重-差热1 A Method of Studying High Temperature Properties of Iron Ore during Sintering Process Pei Yuandong Zhao Zhixing Ban Lili Shi Xuexing Ma Zejun (Shougang Research Institute of Technnology，Beijing ，100043) Abstract Confocal scanning laser microscope (CSLM) has been applied to carry out the in-situ observation of metallurgical phenomena world widely, especially in steelmaking and material treating process. In this paper, melting and solidifying characteristics of iron ore were observed with CLSM under simulated sintering temperature, and high temperature properties of iron ore during sintering process was clarified based on the in situ observation results and TG-DSC tests. Under simulating sintering profile, it can be found that iron ores take on shrinking firstly and then expanding phenomenon, and the shrinking phenomenon is due to solid phase sintering and exclusion of pore from ores. The forming, developing and solidifying of liquid phase were analyzed and discussed based on the experimental results. Key words iron ore, sintering, high temperature properties, confocal scanning laser microscope, in-situ observation, TG-DSC 1 引言 近年来，随着铁矿粉价格的不断上涨、优质铁矿粉资源的逐渐缺乏、钢铁企业盈利能力的持续下降，通 过优化烧结配矿、改善烧结矿质量等措施来降低铁前成本是很有必要的。 铁矿粉的高温特性，如同化性[1～2] 、液相流动性[3～4] 、熔融性[5～9]等，因对烧结矿的产品质量有显著的影 响，故受到了广泛研究，其在烧结优化配矿实践中发挥着重要的