含铁粉尘碳酸化反应随机孔隙模型构建与解析  

Construction and analysis of random pore model for ferrous dust carbonation reaction

作　　者：张志霞 胡长庆 刘文会 Zhang Zhixia;Hu Changqing;Liu Wenhni(College of Chemistry and Material Engineering, Liupanshui Normal University, Liupanshui 553000, Guizhou;a. College of Metallurgy and Energy;b. College of Qian＇an, North China of Scienee and Technology, Tangshan, 063210, Hebei)

机构地区：[1]六盘水师范学院化学与材料工程学院,贵州六盘水553000 [2]华北理工大学冶金与能源学院,河北唐山063210 [3]华北理工大学迁安学院,河北唐山063210

出　　处：《烧结球团》2018年第3期47-51,共5页Sintering and Pelletizing

基　　金：国家自然科学基金项目(№51074061)

摘　　要：碳酸化球团是含铁粉尘再资源化利用的绿色工艺,碳酸化反应过程中球团孔结构变化是影响反应速率和球团性能的重要因素。本文通过热重实验得到不同条件下,含铁粉尘碳酸化球团转化率与时间关系,并测定产物的平均孔径、比表面积等参数,由此构建随机孔隙模型,分析结构参数和无量纲模数对转化率和反应速率的影响。结果表明:结构参数ω增加,转化率提高;当ω=3.51时,反应速率为最大值;初始比表面积S0存在最佳值;齐勒模数φ、施密特数Sh增加,转化率提高;毕涡数β增加,转化率下降。The carbonation process should be considered as a ＂green＂ process of ferrous dust recycling. The change of pellet pore structure during carbonation process is of great importance to the reaction rate and pellet performance. The relationship between time and conversion rate of ferrous dust carbonation pellet under different conditions were obtained through thermal gravity （TG） experiments. The parameters of carbonation products, such as average pore diameter and specific surface area etc. were measured, and then the random pore model was constructed to analyze the effect of structure parameters and non- dimensional modulus on the conversion rate and reaction rate. The results show that, with the increase of structure parameter to, the CaO conversion rate increases, and the carbonation reaction rate reaches the maximum when to is 3.51 ; There is an optimum value of specific surface area So ; With the increase of modulus φ and modulus Sh, the CaO conversion rate increases, and with the increase of modulus β, the CaO conversion rate reduces.

关 键 词：含铁粉尘 碳酸化反应 随机孔隙模型 转化率 

分 类 号：TF046.6[冶金工程—冶金物理化学]