炼钢温度条件下石灰石颗粒的热爆裂行为研究  

The explosion behavior of limestone particles during calcination at steelmaking temperature

作　　者：胡彬[1] 李建立[1] 李静[1] 白莎[1] 蔡金林[1] 薛正良[1] HU Bin LI Jianli LI Jing BAI Sha CAI Jinlin XUE Zhengliang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉科技大学钢铁冶金及资源综合利用教育部重点实验室,湖北武汉430081

出　　处：《炼钢》2017年第1期34-38,共5页Steelmaking

基　　金：国家自然科学基金资助项目(51374160)

摘　　要：随着节能减排和环保要求的提高,石灰石作为造渣剂和冷却剂可直接应用于转炉炼钢。研究在高温(1 350~1 500℃)下是否存在因快速升温而使石灰石产生爆裂及因石灰石高速分解引起熔池喷溅具有重要意义。在实验室条件下,研究了煅烧温度、煅烧时间和颗粒粒径对石灰石颗粒热爆裂行为的影响。研究结果表明煅烧温度和时间对样品的热爆性影响较大,而固体粒径的影响相对较小。随着煅烧温度和时间增加,固体样品表面裂纹明显增多并破碎成小颗粒。结合固体颗粒因快速升温造成内部温度梯度引起的热应力和碳酸钙分解产物CO_2向外扩散压力,对煅烧温度、时间和粒径影响石灰石爆裂性的机理进行了简要分析。Under the situation of the stricter policy of energy conservation and emission reduction,and the national awareness to environment protection,the limestone could be used as the slag-making materials and coolant,directly charged into the converter steelmaking furnace. It owns important significance to investigate the effect of rapid heating of limestone at 1 350- 1 500 ℃ on the spalling behavior of limestone particles and the spatter of molten melts. The influences of calcination temperature,heating time and particle size on the explosion behavior were conducted through a 25 k W carbon-tube furnace in the laboratory. And the results showed that the temperature and heating time had significant effects on the explosion of solid samples,while the influence of particle size was not obvious. When the temperature and calcination time increased,the cracks on the surface of samples obviously became more and bigger,and the solid particles were probably broken into smaller parts. Based on the thermal stress caused by temperature gradient due to rapid heating and the escape pressure of CO2 from the carbonate decomposition,the corresponding mechanisms were also discussed briefly.

关 键 词：石灰石 热爆裂 超高温 转炉炼钢 煅烧 

分 类 号：TF713[冶金工程—钢铁冶金]