基于Gamma粒度分布的电炉渣钙浸出动力学模型  

Kinetic model of calcium leaching for steelmaking slag based on Gamma particle size distribution

作　　者：张慧宁[1] 赖朝彬[1] 芦永明[2] 徐安军[3] 贺东风[3] 田乃媛[3] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]中国钢研科技集团有限公司冶金自动化研究设计院混合流程工业自动化系统及装备技术国家重点实验室,北京100071 [3]北京科技大学冶金与生态工程学院高效钢铁冶金国家重点实验室,北京100083

出　　处：《钢铁》2015年第5期81-87,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51304053);江西理工大学博士启动基金资助项目(jxxjbs14004)

摘　　要：为了研究电炉渣吸收CO2时电炉渣粒度分布对钙浸出率及过程控速的影响,以平均颗粒尺寸为20μm,不同偏离系数(CV)的电炉渣为研究对象,建立了电炉渣在0.05 mol/L醋酸溶液中的浸出动力学模型,并利用Mathematica8.0对模型进行了求解,并通过试验验证了模型的准确性。仿真结果表明,电炉渣在浸出70 min时,钙浸出率基本稳定,在浸出前70 min,浸出反应速率随着偏离系数的增大而增大,70 min后则随着偏离系数的增大而减小。随着电炉渣偏离系数的增大,电炉渣浸出过程受到化学反应控速越来越弱,而受到扩散控速先变强后变弱,在CV=0.7时扩散控速最强。通过试验数据与仿真结果对比,证明所建立的基于Gamma粒度分布的电炉渣钙浸出率动力学模型能较好的反映电炉渣在醋酸溶液中的浸出过程。In order to discuss the effect of particle size distribution on calcium leaching rate and controlling step of reac-tion process when EAF slag is utilized for CO2 sequestration. Kinetic model is established for EAF slag leaching in 0.05 mol/L acetic acid solution,taking with an average size of 20μm,different coefficient variation （CV ） EAF slag as the ob-ject,and the model is solved with software Mathematica8.0,which is verified by experiments. The calculated results show that the calcium leaching rate keeps stable for 70 min,when coefficient variation increases,the reaction rate increas-es before 70 min,and turns down after that. The chemical reaction controlling for leaching process becomes worse,in correspondingly,diffusion controlling firstly turns better then worse,and has the best value for CV=0.7 .It can be con-cluded that by comparison with experimental results,kinetic model for calcium leaching based on Gamma particle size distribution can describe the process of EAF slag leaching in acetic acid solution.

关 键 词：电炉渣 Gamma粒度分布 偏离系数 钙浸出率 动力学模型 

分 类 号：TF827.1[冶金工程—有色金属冶金]