东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (2): 233-236.DOI: -

• 论著 • 上一篇    下一篇

硼铁矿碳热还原过程中MgO的挥发

刘然;薛向欣;姜涛;王杏娟;   

  1. 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;河北理工大学冶金与能源学院 辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004;河北唐山063009
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-02-15 发布日期:2013-06-24
  • 通讯作者: Liu, R.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50374022)

Volatilization of MgO from ludwigite in carbothermal reduction process

Liu, Ran (1); Xue, Xiang-Xin (1); Jiang, Tao (1); Wang, Xing-Juan (2)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China; (2) School of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-02-15 Published:2013-06-24
  • Contact: Liu, R.
  • About author:-
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摘要： 在热力学分析的基础上,研究了碳热还原硼铁矿过程中MgO的还原挥发过程.结果表明,试样的总失重率随着温度的升高而增大,1 400~1 450℃时很快达到最大值,最大失重率为61.8%.MgO以镁蒸气的形式挥发而造成失重,试样中MgO最大失重率达到98.0%.挥发过程中又被重新氧化,一部分在炉管底部形成羽毛状的白色晶体,另一部分和硼、硅的挥发物一起在炉管口形成白色粉末,附着在炉管壁上.证明了碳热还原硼铁矿过程中MgO有挥发现象.

关键词: 硼铁矿, 碳热还原, 挥发, MgO, 热力学分析

Abstract: Thermodynamic analysis was made to study the reduction volatilization of MgO in ludwigite by way of carbothermal reduction. The experimental results showed that the total mass loss rate of samples increases with rising temperature, of which the maximum is 61.8 wt% in the range from 1400°C to 1450°C. Magnesia in ludwigite was reduced and volatilized as gaseous magnesium vapour in the process of carbothermal reduction, and its mass loss rate went up to 98.0%. Magnesium was reoxidated into magnesia in the process of volatilization, where part of the volatilized matter formed the white feather-like crystal deposited on the bottom of furnace tube and the rest formed white powder deposited at the opening of furnace tube and adhered to tube wall together with boride/silicon volatilized. It was proved that there is volatilization of MgO from ludwigite in the process of carbothermal reduction.

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