摘要
皮江法炼镁工艺中,掌握镁蒸气流动和结晶规律是获得高质量结晶镁的关键。针对这一问题,研究了复式竖罐内镁蒸气从还原反应区流动到结晶区过程中的流动规律,并通过引入高温稀薄气体中流导的概念给出了镁蒸气流动过程阻力计算方法,推导出镁蒸气流动阻力与还原罐内径、运动距离以及压强之间的关系式。结果表明:镁蒸气的结晶过程不仅受温度和压强影响,还与结晶器的内径相关,适当减小结晶器内径可获得致密度较高的结晶镁;镁蒸气从复式竖罐中的反应区流动到结晶区,镁蒸气的总压降约为150 Pa,还原反应区平均压强数量级在百帕以上;镁冶炼初期,部分料球温度低于600℃时,镁蒸气以“凝华-升华”的方式在反应区层移,随着料球整体温度升高到600℃以上,镁蒸气流动阻力减小,能够顺利进入结晶器结晶。
In the Pidgeon magnesium smelting process,magnesium vapor flow and crystallization are the key issues in obtaining high-quality crystalline magnesium.In this study,the flow characteristic of magnesium vapor in the compound vertical retort from the reduction reaction zone to the crystallization zone was examined.The calculation method of flow resistance was given by introducing the concept of conductance in high-temperature rarefied gas.The relationship between flow resistance and the retort inner diameter,retort size,vapor pressure was deduced.It is shown that the crystallization process of magnesium vapor was not only affected by temperature and pressure,but also related to the diameter of the crystallizer.Appropriately reducing the inner diameter of the crystallizer can obtain crystalline magnesium with higher density.The total pressure loss of magnesium vapor in the compound vertical retort from the reaction zone to crystallization zone was about 150 Pa,and the average working pressure in the reaction zone was higher than two order of magnitude.In the early stage of magnesium smelting,when the temperature of part of the pellets was lower than 600℃,the magnesium vapor moved in the reaction zone in a“condensationsublimation”manner.As the temperature of the overall pellet rised above 600℃,the flow resistance of magnesium vapor decreased,and it could smoothly enter the crystallizer for crystallization.
作者
陈毛
张少军
李荣斌
南俊杰
刘金辉
杨沛胥
CHEN Mao;ZHANG Shaojun;LI Rongbin;NAN Junjie;LIU Jinhui;YANG Peixu(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2023年第4期88-93,共6页
Journal of Zhengzhou University（Engineering Science）
基金
国家重点研发计划项目(2019YFC1908403)
中国博士后科学基金资助项目(2020M682337)
中央高校基本科研业务费专项资金资助项目(2302018FRF-TP-18-095A1)。
关键词
镁冶炼
镁蒸气
竖罐
硅热法
流动阻力
magnesium smelting
magnesium vapor
vertical retort
silicothermic process
flow resistance
作者简介
通信作者:李荣斌(1983-),男,山西运城人,北京科技大学副教授,博士,主要从事有色金属冶金的研究,E-mail:lirongbin@ustb.edu.cn。
