基于Gamma粒度分布的电炉渣钙浸出动力学模型

doi:10.13228/j.boyuan.issn0449-749x.20140582

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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20 μm，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。

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	张慧宁

关键词 ：电炉渣，Gamma粒度分布，偏离系数，钙浸出率，动力学模型

Abstract：In order to discuss the effect of particle size distribution on calcium leaching rate and controlling step of reaction 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 20 μm， different coefficient variation [(CV)] EAF slag as the object， 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 increases 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 concluded 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.

收稿日期: 2014-09-22 出版日期: 2015-04-28

引用本文:

张慧宁，赖朝彬，芦永明，徐安军，贺东风，田乃媛. 基于Gamma粒度分布的电炉渣钙浸出动力学模型[J]. 钢铁, 2015, 50(5): 81-87. ZHANG Hui-ning，LAI Chao-bin，LU Yong-ming，XU An-jun，HE Dong-feng，TIAN Nai-yuan. Kinetic model of calcium leaching for steelmaking slag based on Gamma particle size distribution. Iron and Steel, 2015, 50(5): 81-87.

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