石灰石在转炉炉渣中分解行为的机理  

Mechanism of limestone decomposition under converter slag environment

作　　者：鲁华[1,2] 毛文文 李晨晓[1,2] 李宏[1,2] 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083

出　　处：《中国冶金》2016年第10期59-66,共8页China Metallurgy

基　　金：国家科技支撑计划资助项目(2012BAC27B02);国家自然科学基金资助项目(51334001)

摘　　要：针对转炉使用石灰石代替石灰炼钢造渣速度加快的现象,研究将FeOx、SiO2和MnOx按照一定的配比与CaCO3混合来模拟石灰石在转炉炉渣中的环境,通过热重-差热(TG-DTA)同步热分析试验探寻其分解规律。研究结果表明,炉渣组分能够明显降低石灰石的分解温度,提升石灰石的分解速度。将混合试样在管式炉煅烧后经X射线衍射分析后发现,CaCO3的分解产物能够与炉渣组分结合生成氧化物或者固溶体,从而降低CaO的活度。During the process of converter steelmaking,the slagging speed increased quickly when using limestone instead of lime for slagging.The CaCO3 was mixed with the FeOx,SiO2 and MnOxaccording to the certain proportion to simulate the environment of limestone in the converter slag.And the TG-DTA experiments was conducted to explore the limestone decomposition discipline,whose results showed that FeOx,SiO2 and MnOxcan reduce the decomposition temperature of CaCO3 and increase the decomposition rate of limestone.XRD results of the mixed specimen calcined in the tube furnace indicated that converter slag components can be combined with decomposition product of limestone and generate oxide or solid solution,which can reduce the activity of CaO.

关 键 词：石灰石 转炉炉渣 热分析 分解温度 XRD 活度 

分 类 号：TF713[冶金工程—钢铁冶金]