目前,世界85%以上的金属镁是在中国利用皮江法生产,尽管皮江法得到不断改进,仍属于高能耗、高排放的冶金工艺.针对皮江法的不足,东北大学提出集煅烧与还原于一体的炼镁方法,该方法采用预制球团为原料,煅烧和还原均在同一设备中完成的炼镁方法.新技术能够取消皮江法的回转窑煅烧工序,煅烧产生的CO2余热能够得到利用,且高浓度的CO2易于矿化捕集.本文汇总了该工艺的研究进展,包括球团预制、球团煅烧及球团的还原过程.实验结果表明:煅烧前后球团的抗压强度分别为76N和55N,在10Pa 真空条件下,1400℃还原1h,还原率为93.5%.
Magnesium produced by Pidgeon process in China accounts for 80% of the global yields.Although the Pidgeon process was modified and there was a big progress on energy efficient and environmental protection, it is still a high energy consumption and high emissions process.In order to solve these problems, a new technique of calcination-reduction integration process for magnesium production was proposed by the authors at Northeastern University China, in which the pre-prepared pellets were employed as the raw materials and both the calcination stage and the reduction stage wre carried out in one reactor.In the novel process, the rotary kiln for calcination used in Pidgeon process was canceled and the heat carried by CO2 produced from the decomposition of dolomite was utilized, thus the high concentration CO2 was captured.In the present paper the research progress of the process, including the preparation of pellets, its calcination and reduction were reported.The results indicated that the pellet strength before and after calcination reaches 76N and 55N, respectively.The reduction ratio reaches 93.5% at 1400℃ for 1h in a pressure of 10Pa.
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