硼镁石与碳酸钙混合煅烧-还原提镁研究  

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

作　　者：彭建平[1] 王耀武[1] 朱钢立 冯乃祥[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第7期957-961,共5页Journal of Northeastern University(Natural Science)

基　　金：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)

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Ca O可置换出Mg3B2O6,Mg2B2O5中的Mg O,并且在还原过程中Ca12Al14O33的形成有利于Mg O的还原.煅烧温度过高会降低Mg O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mCa/ms=1.9配比混合,在90 MPa压力制团,在1100℃下煅烧120 min后,铝热还原的镁还原率可达85%以上,实现硼、镁有效分离.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 Mg O were replaced from Mg3B2O6 and Mg2B2O5 by Ca O during the calcination process of the mixtures. Moreover,the formation of Ca12Al14O33 favored the reduction of Mg O. 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 Mg O. The reduction ratio of Mg O was greater than 85% when the mixture with mCa/ ms= 1. 9 was formed at 90 MPa and then calcinated at 1 100 °C for 120 min.

关 键 词：还原 硼镁石 镁 碳酸钙 铝 

分 类 号：TF131.1[冶金工程—冶金物理化学]