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影响工业还原罐内铝热法炼镁过程还原效率的因素

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在工业还原罐内进行铝热还原炼镁试验,分析影响还原效率的因素.结果表明:结晶镁的氧化和燃烧以及原料混合不均匀是导致还原效率降低的主要原因;原料混合不均匀导致贫铝区和MgO剩余,促进生成12CaO·7Al2O3和CaO·Al2O3;对于富铝区域,MgO和CaO同时被还原,生成Mg2Ca相.辐射传热和化学反应吸热是影响还原速率的关键因素;提高加热温度能够迅速提高球团层的温度,进而使球团获得足够的反应速度;此外,球团中含镁量越高,需要的反应时间越长.
Factors affecting reduction efficiency in industrial retorts for Mg production by aluminothermic process
Industrial experiments were carried out for Mg production by aluminothermic process in industrial retorts and the factors affecting the reduction efficiency were analyzed.The results show that the main factors reducing the reduction ratio are oxidation and combustion of crystallized magnesium and uneven mixing of raw materials.The latter could result in raw material regions with low Al concentration and MgO redundance,which can promote the formation of 12CaO·7Al2O3 and CaO·Al2O3.For raw material regions with higher Al concentration,both MgO and CaO can be reduced to form the Mg2Ca phase.Radiation and chemical reaction heat are the key factors affecting the reaction rate.Increasing the heating temperature can rapidly increase the bed temperature and obtain sufficient reaction ratio.The higher the magnesium content in the pellets is,the longer the reduction time is required.

magnesium metallurgyvacuum aluminothermic reductionPidgeon processheat transfer

傅大学、王耀武、狄跃忠、彭建平、冯乃祥

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东北大学多金属共生矿生态化冶金教育部重点实验室,沈阳 110819

东北大学 冶金学院,沈阳 110819

镁冶金 真空铝热还原 皮江法 传热

国家重点研发计划国家自然科学基金国家自然科学基金中央高校基本科研业务费专项Natural Science Foundation of Liaoning Province,China

2021YFC290032052187804551504058N22250192022-MS-106

2024

10.1016/S1003-6326(24)66471-X

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(4)
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