球团预制-硅热还原炼镁还原罐内传热

doi:10.12068/j.issn.1005-3026.2018.05.008

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (5): 643-648.DOI: 10.12068/j.issn.1005-3026.2018.05.008

球团预制-硅热还原炼镁还原罐内传热

傅大学^1,2，张廷安^1,2，豆志河^1,2，关录奎^1,2

(1. 东北大学冶金学院，辽宁沈阳110819; 2. 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)

收稿日期:2017-01-06 修回日期:2017-01-06 出版日期:2018-05-15 发布日期:2018-05-25
通讯作者: 傅大学
作者简介:傅大学(1986-)，男，辽宁沈阳人，东北大学讲师，博士; 张廷安(1960-)，男，河南周口人，东北大学教授，博士生导师；豆志河(1978-)，男，河南周口人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(U1508217， 51504058， 51404054); 中央高校基本科研业务费专项资金资助项目(N162504003， N140204013); 辽宁省博士启动基金资助项目(201601003); 辽宁省教育厅项目(LZ2014021).

Heat Transfer in a Retort for Mg-Extraction by Pre-prepared Pellet Silicothermic Process

FU Da-xue^1,2， ZHANG Ting-an^1,2， DOU Zhi-he^1,2， GUAN Lu-kui^1,2

1. School of Metallurgy， Northeastern University， Shenyang 110819， China; 2. Key Laboratory for Ecological Utilization of Multimetallic Mineral

Received:2017-01-06 Revised:2017-01-06 Online:2018-05-15 Published:2018-05-25
Contact: ZHANG Ting-an
About author:-
Supported by:
-

摘要/Abstract

摘要： 为了解决皮江法还原罐内传热慢的问题，提出将白云石粉、硅铁、萤石混合，加入黏结剂先造球再煅烧，煅烧后的热球团直接用于还原的炼镁新技术.采用数值方法研究预制球团在还原罐内的传热规律.结果表明:提高硅铁添加量、增加球团直径、减小床层密度均有利于热量向还原罐内部传递;将边界温度由1473K提高至1498K，还原罐中心区域达到1473K的时间由300min缩短至178min;当还原罐直径为300mm时，对于直径为25mm的预制球团，还原罐中心点加热至1473K的时间为90min，而对于皮江法球团则需要288min.

关键词: 还原罐内传热, 预制球团, 皮江法, 镁冶金

Abstract: A novel method of feed preparation for silicothermic process was proposed in order to solve low efficiency of heat transfer in Pidgeon process. In this method， dolomite and ferrosilicon were mixed to produce pellets and then were calcined. The pre-prepared pellets were charged into the retorts for Mg extraction at once after calcinations. Heat transfer in a retort for the novel process was investigated by a numerical method. The results show that a better heat transfer can be obtained by increasing the amount of Si-Fe addition， pellet diameter or decreasing the packed bed density. The time for heating the center of the retort into 1473K decreases from 300min to 178min， after increasing the boundary temperature from 1473K to 1498K. In a retort of 300mm diameter， the heating time is 90min for the center of the retort charged by pre-prepared pellets of 25mm diameter reaching 1473K， compared with that of 288min in Pidgeon process.

Key words: heat transfer in a retort, pre-prepared pellets, Pidgeon process, magnesium production

中图分类号:

TF822

傅大学，张廷安，豆志河，关录奎. 球团预制-硅热还原炼镁还原罐内传热[J]. 东北大学学报:自然科学版, 2018, 39(5): 643-648.

FU Da-xue， ZHANG Ting-an， DOU Zhi-he， GUAN Lu-kui. Heat Transfer in a Retort for Mg-Extraction by Pre-prepared Pellet Silicothermic Process[J]. Journal of Northeastern University Natural Science, 2018, 39(5): 643-648.

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[11]傅大学，张廷安，豆志河，等.炼镁用预制球团填充层的有效导热系数研究［J］.材料与冶金学报，2016，15(4):260-266.(Fu Da-xue，Zhang Ting-an，Dou Zhi-he，et al.Effective thermal conductivity of pre-prepared pellet packed bed for magnesium extraction by silicothermic process ［J］.Journal of Materials and Metallurgy，2016，15(4):260-266.)(上接第632页)始组织有利于晶界特征分布的优化，特殊晶界比例得到明显提高.高比例的∑3晶界是晶界优化的基础，同时可以产生较多的∑9晶界和∑27晶界，有助于阻断大角度晶界的连通性，形成较大尺寸的晶粒团簇组织.2) 二次退火工艺可以明显提高材料的特殊晶界比例，产生更多∑9和∑27晶界，从而可以有效地阻断大角度晶界的连通性，实现晶界特征分布优化的结果.对比一次退火组织可以看出，非共格孪晶的产生，是阻断晶界连通性的关键因素.

球团预制-硅热还原炼镁还原罐内传热

Heat Transfer in a Retort for Mg-Extraction by Pre-prepared Pellet Silicothermic Process

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