硅热法炼镁增产提质的原理探索与应用  

Principle exploration and application of simultaneous achieving production and quality of magnesium in silicothermic reduction process

作　　者：郑芮 杨博 王安[1,2,3] 刘博宇[1,2,3] 王鹏飞 单智伟[1,2,3] ZHENG Rui;YANG Bo;WANG An;LIU Bo-yu;WANG Peng-fei;SHAN Zhi-wei(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China;Engineering Research Center for Magnesium-based New Materials,Xi’an Jiaotong University,Xi’an 710049,China;Department of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Guoke Magnesium Technology(Henan),Co.,Ltd.,Luoyang 471000,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]西安交通大学陕西省镁基新材料工程研究中心,西安710049 [3]西安交通大学材料科学与工程学院,西安710049 [4]国科镁业科技(河南)有限公司,洛阳471000

出　　处：《中国有色金属学报》2023年第7期2347-2355,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52031011);陕西省科技厅资助项目(2021GXLH-Z-015)。

摘　　要：在硅热法炼镁工艺中,还原罐和结晶器的工作原理导致罐口附近一定存在大梯度降温区,但关于还原罐罐口附近温度场对料镁比(料球和所产镁的质量比)影响的研究鲜见报道。本文设计并搭建了能定位测温的近生产条件的实验装置,测量发现罐口附近的低温区导致料球反应率降低,料镁比提高。为了提升罐口附近温度,本文设计了一个阻止热量散失的装置。结果表明:使用阻热装置后,罐口附近温度显著提升,并使料镁比从6.3降至5.95;同时该装置还可使粗镁纯度从不足国标Mg9980升至Mg9995A,兼具通过梯度冷凝去除杂质的功效。In the process of primary magnesium production by silicothermic reduction,a cooling zone with large gradient always exists near the retort outlet due to the setup of a necessary cooling system between the retort and crystallizer.However,few studies pay attention to influences of the temperature field near the retort outlet on the reaction rate,which can be reflected by the mass ratio of pellet and magnesium,a key parameter concerned by the primary magnesium industry.Here,by designing and building up an experimental retort that can mimic the actual production conditions and allows accurate temperature measurement at specific positions,we found that,the temperature near the retort outlet is low enough to lead to a significant reduction of reaction rate thus a higher mass ratio of pellet and magnesium.In order to suppress such a large temperature drop and raise the temperature,we designed a device to prevent heat loss near the retort outlet.With the usage of such device,the temperature near the retort outlet significantly increases compared to the control groups.As a result,the mass ratio of pellet and magnesium decreases from 6.3 to 5.95.Moreover,the purity level of the produced crude magnesium improves from less than Mg9980(GB/T 3499—2011)to Mg9995A,which is attributed to the gradient condensation of impurities on this device.The industrial application of our design and its principle are expected to simultaneously improve the production and quality of primary magnesium made by silicothermic reduction,which can further benefit the entire magnesium industry.

关 键 词：硅热法 料镁比 罐口温度 产量 纯度 

分 类 号：TF822[冶金工程—有色金属冶金]