东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (7): 957-961.DOI: 10.12068/j.issn.1005-3026.2015.07.010

• 材料与冶金 • 上一篇    下一篇

硼镁石与碳酸钙混合煅烧-还原提镁研究

彭建平， 王耀武， 朱钢立， 冯乃祥   

  1. (东北大学 材料与冶金学院， 辽宁 沈阳110819)
  • 收稿日期:2014-06-03 修回日期:2014-06-03 出版日期:2015-07-15 发布日期:2015-07-15
  • 通讯作者: 彭建平
  • 作者简介:彭建平(1979-)，男，四川中江人，东北大学讲师，博士； 冯乃祥(1944-)，男，河北丰润人，东北大学教授，博士生导师.
  • 基金资助:
    辽宁省镁质材料行业高新技术研发项目(MYF2011-34); 中央高校基本科研业务费专项资金资助项目(N100302009).

Study on Calcination of Szaibelyite and Calcium Carbonate Mixture for Magnesium Extraction

PENG Jian-ping， WANG Yao-wu， ZHU Gang-li， FENG Nai-xiang   

  1. School of Materials & Metallurgy， Northeastern University， Shenyang 110819， China.
  • Received:2014-06-03 Revised:2014-06-03 Online:2015-07-15 Published:2015-07-15
  • Contact: PENG Jian-ping
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摘要： 基于硼镁石与碳酸钙混合料的煅烧实验和真空铝热还原实验，研究了碳酸钙量、成型压力、煅烧条件对熟料物相、原料烧损率、镁还原率的影响.结果表明，添加碳酸钙，在煅烧过程中CaO可置换出Mg3B2O6，Mg2B2O5中的MgO，并且在还原过程中Ca12Al14O33的形成有利于MgO的还原.煅烧温度过高会降低MgO活性，不利于后续铝热还原.增大成型压力，有利于Ca3B2O6的形成.但成型压力过大，在相同煅烧条件下，矿石的烧损率较低，镁还原率较低.碳酸钙与硼镁石以m○Ca/m○s = 1.9配比混合，在90MPa压力制团，在1100℃下煅烧120min后，铝热还原的镁还原率可达85%以上，实现硼、镁有效分离.

关键词: 还原, 硼镁石, 镁, 碳酸钙, 铝

Abstract: Calcination of szaibelyite and calcium carbonate mixtures and extraction of magnesium from the calcined products by vacuum aluminothermic reduction were experimentally studied. The effects of calcium carbonate addition， forming pressure and calcination temperature on phases in the calcination products， the burning loss ratio of the mixtures and reduction ratio of magnesium oxide were discussed. The results indicated that most of the MgO were replaced from Mg3B2O6 and Mg2B2O5 by CaO during the calcination process of the mixtures. Moreover， the formation of Ca12Al14O33 favored the reduction of MgO. Although it was favorable for the formation of Ca3B2O6， higher forming pressure caused lower burning loss ratio of the mixture and lower reduction ratio of MgO. The reduction ratio of MgO was greater than 85% when the mixture with m○Ca/m○s = 1.9 was formed at 90MPa and then calcinated at 1100°C for 120min.

Key words: reduction, szaibelyite, magnesium, calcium carbonate, aluminum

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