转炉渣组成对石灰石分解温度和活化能的影响  

Influence of converter slag on decomposition temperature and activity energy of limestone

作　　者：鲁华[1,2] 毛文文 李晨晓[1,2] 李宏[1,2] LU Hua MAO Wenwen LI Chenxiao LI Hong(State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing 100083, China Metallurgical and Ecological Engineer School, University of Science and Technology Beijing, Beijing 100083, China)

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：《炼钢》2017年第1期24-33,共10页Steelmaking

摘　　要：针对转炉使用石灰石替代石灰炼钢造渣速度加快的现象,研究首先将FeO_x、SiO_2以及按照一定配比烧制成的预熔渣与CaCO_3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大大降低CaCO_3的分解温度,提升石灰石的分解速度,并且多元预熔渣的促进效果强于单一炉渣组分。通过Flynn-Wall-Ozawa法计算不同混合体系中CaCO_3的分解活化能,结果发现炉渣组分能够降低其分解反应的活化能。将混合体系在管式炉煅烧后经X射线衍射分析后发现,CaCO_3的分解产物能够与炉渣组分结合生成氧化物或者固溶体,降低CaO的活度。最后通过热重-示差扫描量热法(TG-DSC)考察比较活性石灰和石灰石与预熔渣的化渣能力,试验结果表明二者化渣能力差别不大。During the process of converter steelmaking,the speed of slag-making would not get slower,even more quickly when using limestone instead of lime for slagging. Because limestone was surrounded by converter slag,and FeOx,SiO2 and pre-melted slag were mixed with CaCO3 according to the certain proportion to simulate the environment of limestone in the converter slag. TG-DTA results showed that Fe Ox and SiO2 could reduce the decomposition temperature of CaCO3. Multiple slag components acting together had further reducing effects than their individual impacts. CaCO3 decomposition activation energy was calculated by Flynn-Wall-Ozawa method under different conditions. XRD results found that converter slag components would be combined with decomposition product of limestone and generated solid solution or oxide,which reduced the activity of CaO and the decomposition temperature of CaCO3. In the end,active lime and limestone were mixed with pre-melted slag,and TG-DSC results showed that there was only a little difference of slag ability between two forms of lime.

关 键 词：石灰石 转炉炉渣 热分析 分解温度 活化能 XRD 活度 

分 类 号：TF713[冶金工程—钢铁冶金]