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›› 2009, Vol. 9 ›› Issue (6): 1137-1141.

• 过程与工艺 • 上一篇    下一篇

硅铁还原菱镁矿制镁的热力学分析与实验研究

高枫 冯乃祥 任保轶 孙怀宇   

  1. 沈阳化工学院 化工原理教研室 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学材料与冶金学院
  • 收稿日期:2009-07-09 修回日期:2009-09-08 出版日期:2009-12-20 发布日期:2009-12-20
  • 通讯作者: 高枫

Thermodynamic Analysis and Experimental Study on Reduction of Mg from Magnesite with Ferrosilicon

GAO Feng FENG Nai-xiang REN Bao-yi, SUN Huai-yu   

  1. Northeastern University Material and metallurgy Academy School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University School of Materials and Metallurgy, Northeastern University
  • Received:2009-07-09 Revised:2009-09-08 Online:2009-12-20 Published:2009-12-20
  • Contact: GAO Feng

摘要: 对硅铁还原氧化镁进行了热力学分析,计算出硅铁还原氧化镁的化学反应自由能和临界反应温度,表明造渣反应和真空条件可使临界反应温度由3846 K降到1358 K. 实验得出还原温度1473 K、10.13 Pa真空度、还原时间1 h及CaO/MgO摩尔比1.4时,镁还原率达94.42%,还原金属镁纯度达98.36%,渣团物相主要为Ca2SiO4和SiO2.

关键词: 氧化镁, 真空还原, 热力学分析, 还原温度, 还原时间

Abstract: Based on thermodynamic analysis, the Gibbs free energy and critical temperature of deoxidization of MgO with ferrosilicon were calculated. The analysis showed that the slagging reaction and vacuum could make critical temperature decrease from 3846 K to 1358 K below. Corresponding experimental result showed that Mg metal reduction rate of 94.42% was achieved under the conditions of reduction temperature 1200℃, 10.13 Pa vacuum, and reaction time 1 h in the reactor with a molar ratio of CaO to MgO of 1.4, and pure metallic magnesium (98.36%) was prepared, the main compounds in the slag were Ca2SiO4 and SiO2.

Key words: MgO, vacuum reduction, thermodynamic analysis, reduction temperature, reduction time

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