工艺参数对硅热法炼镁过程的影响机理  

Influence mechanism of technology parameters on silicothermic reduction process

作　　者：张超 宋建勋 车玉思 何季麟 ZHANG Chao;SONG Jian-xun;CHE Yu-si;HE Ji-lin(School of Thermal Engineering,Shandong Jianzhu University,Jinan 250101,China;School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]山东建筑大学热能工程学院,济南250101 [2]郑州大学材料科学与工程学院,郑州450001

出　　处：《中国有色金属学报》2021年第5期1347-1357,共11页The Chinese Journal of Nonferrous Metals

基　　金：安徽省自然科学基金资助项目(1808085QE152);安徽高校自然科学研究项目(KJ20190048);国家自然科学基金资助项目(51804277,92062223)

摘　　要：配硅比和煅白水化活性度是影响硅热法炼镁生产效率的显著因素,现有文献主要研究这些因素对总体还原过程的影响作用,不能准确反映工艺参数深层次的影响机理。本工作采用动力学实验的方法获得工艺参数对硅热法炼镁化学反应动力学的影响规律,分别建立包含配硅比(MSi)和煅白水化活性度(γ)的化学反应动力学模型,与传热模型结合后采用数值模拟的方法计算还原过程中的实时产镁速率和最终产镁量。虽然动力学数据表明还原率随配硅比和煅白水化活性度的增加而升高,但工业生产过程中并不总是表现出这种规律,因其还受到传热因素制约。当原料和粗镁价格随市场波动时,本工作可以指导生产厂家合理调整相关工艺参数。Silicon stoichiometry and hydration activity of calcined dolomite are significant determinants of silicothermic magnesium production efficiency.However,current literatures focus on discussing effects of these factors on the whole reduction process,and they can not accurately reflect the deeper influence mechanism.The influences of technical parameters on the detailed kinetic were studied experimentally,and the kinetic models include process parameters were proposed,then these models were combined with heat transfer model to calculate magnesium reduction and generation rate during the production process by using numerical calculation.Although kinetic experiments show that the magnesium reduction increases with silicon stoichiometry and hydration activity of calcined dolomite,the patterns may differ in the industrial production,because the process is also affected by heat transfer.This study can guide manufacturers to adjust technical parameters and reduce the production costs when the prices of raw materials and magnesium fluctuate with the market supply and demand.

关 键 词：镁 硅热法 反应动力学 动力学模型 传热 数值模拟 

分 类 号：TQ151.8[化学工程—电化学工业]