摘要
采用热天平减重法在氧气高炉气氛下进行烧结矿的还原实验,考察还原度RI和还原速率RI′的变化情况,并进行烧结矿还原动力学分析。结果表明:在氧气高炉气氛900℃下还原时,烧结矿的还原度RI高达98.2%;还原终了时间随还原温度的提高而缩短,由900℃时的117min缩短到1 100℃时的63min;氧气高炉气氛下,烧结矿还原的开始阶段由界面化学反应控速,还原约20min后转变为由界面化学反应和内扩散混合控速;氧气高炉气氛900～1100℃时,烧结矿还原反应开始阶段的表观活化能为38.30kJ/mol。
The reduction experiment of sinter has been taken in oxygen blast furnace atmosphere by thermal balance weight loss method.The changes of reduction RI and reduction rate RI′ have been examined,and then kinetics analysis of sinter reduction have been carried on.Results show the reduction of sinter is significantly improving in oxygen blast furnace atmosphere and the reduction RI measures up to 98.2% when the sinter is reducing at 900 ℃.With the reduction temperature increasing,the reduction rate of sinter speeds up significantly,and the end time of reduction is shorten from 117 min at 900 ℃ to 63min at 1 100 ℃.When sinter is reducing in oxygen blast furnace atmosphere,the reductive reaction is mainly controlled by the interface chemical reaction in the beginning,and then turn to hybrid controlled by both interface chemical reaction and internal diffusion about 20 min later.The apparent activation energy of reaction that sinter reducing in oxygen blast furnace atmosphere at 900 ~ 1 100 ℃ is 38.30 kJ/mol.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第11期67-74,共8页
Journal of Chongqing University
基金
国家重点基础研究发展计划(973)资助项目(2012CB720401)
国家科技支撑计划资助项目(2011BAC01B02)
关键词
高炉
烧结矿
还原
反应动力学
活化能
blast furnace
sinter
reduction
reaction kinetics
activation energy
