东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (4): 522-526.DOI: 10.12068/j.issn.1005-3026.2016.04.015

• 材料与冶金 • 上一篇    下一篇

冰晶石熔盐介质中铝热还原-熔盐电解二氧化硅

刘爱民， 管晋钊， 谢开钰， 石忠宁   

  1. (东北大学 冶金学院， 辽宁 沈阳110819)
  • 收稿日期:2015-02-09 修回日期:2015-02-09 出版日期:2016-04-15 发布日期:2016-04-05
  • 通讯作者: 刘爱民
  • 作者简介:刘爱民(1990 -)，男，湖南衡阳人，东北大学博士研究生； 石忠宁(1975-)，男，广西都安人，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( 51322406); 教育部新世纪优秀人才支持计划项目(NCET-13-0107); 中央高校基本科研业务费专项资金资助项目( N140205001， L1502014).

Aluminothermic Reduction-Molten Salt Electrolysis of Silica in Cryolite Melts

LIU Ai-min， GUAN Jin-zhao， XIE Kai-yu， SHI Zhong-ning   

  1. School of Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2015-02-09 Revised:2015-02-09 Online:2016-04-15 Published:2016-04-05
  • Contact: SHI Zhong-ning
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摘要： 讨论了铝热还原二氧化硅的热力学条件，热力学计算结果表明铝热还原二氧化硅的反应在热力学上可行.差示扫描量热法分析结果表明，铝热还原二氧化硅反应的表观活化能为697.5kJ/mol，反应级数为3.7.在冰晶石熔盐介质中铝热还原二氧化硅，可得到含8.56%硅的铝硅合金及富氧化铝的冰晶石熔盐；使用惰性阳极电解分离后的富氧化铝的冰晶石熔盐，可得到含94.01%铝的铝硅合金及氧气，硅的回收率为83.43%.

关键词: 铝热还原, 熔盐电解, 二氧化硅, 冰晶石, 铝硅合金

Abstract: The thermodynamic conditions for the aluminothermic reduction of the silica were discussed. The thermodynamic calculation results showed that reducing silica by aluminum is thermodynamically feasible. The kinetic analysis by non-isothermal differential scanning calorimetry indicated that the apparent activation energy was 697.5kJ/mol， while the reaction order was 3.7. Al-Si alloy including 8.56%silicon and the alumina-rich cryolite were obtained by the aluminothermic reduction of silica in cryolite molten salt medium. Al-Si alloys contained 94.01%aluminum and oxygen were produced using the alumina-rich cryolite molten salts separated by the inert anode， and the recovery rate of silicon was 83.43%.

Key words: aluminothermic reduction, molten salt electrolysis, silica, cryolite, Al-Si alloy

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