基于床层传热的皮江法炼镁过程优化  

Optimization of Mg Production by Pidgeon Process Based on Heat Transfer in the Bed

作　　者：傅大学[1,2,3] 狄跃忠 王耀武[1,2] FU Da-xue;DI Yue-zhong;WANG Yao-wu(Key Laboratory for Ecological Utilization of Multimetallic Mineral(Ministry of Education),Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Fujian Changting Golden Dragon Rare-Earth Co.,Ltd.,Longyan 366300,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819 [3]福建省长汀金龙稀土有限公司,福建龙岩366300

出　　处：《东北大学学报（自然科学版）》2024年第4期523-529,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(21878045);中央高校基本科研业务费专项资金资助项目(N2225019);辽宁省自然科学基金资助项目(2022-MS-106);中国博士后科学基金资助项目(2022M710701)。

摘　　要：球团在还原罐内传热导致的温度梯度是限制皮江法还原反应的关键因素.本文采用数值方法研究了球团尺寸、装料方式、还原罐外壁温度等因素对床层温度分布、还原率分布的影响.结果表明:在球团直径为22.3 mm、还原时间相同时能够获得最大的还原率;生产过程中应尽量提高还原罐外壁温度;床层中心区域温度低,还原反应速率慢,反应滞后;通过中心留空的方法能够有效缩短还原周期,提高原料利用率;以单位体积、单位时间镁的产量为依据,对于内径为270 mm的还原罐,当中心留空区域的直径小于27 mm时,可获得最大生产效率.The temperature gradient in pellets bed caused by heat transfer is a key factor which limits the reduction reaction in the Pidgeon process.In this paper,the effects of some factors,such as pellet size,charging pattern,temperature of the outer wall of the retort on the temperature distribution and reduction ratio distribution in the bed are studied with numerical method.The results show that the maximum reduction rate can be obtained when the pellet diameter is 22.3 mm and the reduction time is the same.The temperature of the outer wall of the retort should be increased as much as possible in the production process.The closer to the central area of the bed,the lower is the temperature,and the lower is the reduction ratio,and reduction reaction lage.The method by making an empty central region can effectively shorten the reduction cycle and improve the utilization ratio of raw materials.The optimal size of the empty central region is less than 27 mm diameter based on Mg yield per unit volume and unit time by taking operation time and reduction time into consideration for the retort with inner diameter 270 mm.

关 键 词：镁 皮江法 真空硅热还原 数值仿真 传热 

分 类 号：TF822[冶金工程—有色金属冶金]