添加剂对钛精矿固相碳热还原强化作用的比较  

Comparison of the Effects of Different Additives on the Solid Phase Carbon Thermal Reduction of Ilmenite

作　　者：吕学伟[1] 张凯[1] 黄润[1] 宋兵[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《东北大学学报（自然科学版）》2013年第11期1601-1605,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51090383;51090382)

摘　　要：利用热重分析法研究了硅铁、硼砂、碳酸钠三种不同添加剂对钛精矿固相碳热还原行为的影响.对这三种添加剂的TG,DTG,DSC曲线进行分析,结果表明硅铁会使钛精矿在还原过程中的失重率减少;而碳酸钠和硼砂会使钛精矿在还原过程中的失重率增加.三种添加剂都可以使达到最大反应速率时的温度降低.碳酸钠和硼砂可以显著提高其最大反应速率,分别提高了0.13%/min和0.18%/min;硅铁使最大反应速率降低.其强化还原机理为硅铁为反应提供一定热量,提高了反应体系的温度;硼砂促进还原过程中反应物的传输;碳酸钠可以增强碳的气化反应.The effects of adding Fe-Si, Na2B407, Na2CO3 on the solid phase reduction behaviors of ilmenite were studied with the thermogravimetric analysis （TG）. From the analysis of the TG, DTG and DSC curves, the results showed that the mass loss ratio of the mixture of the ilmemite and coke during the reduction decreased by adding Fe-Si, while increased by adding Na2CO3 or Na2B407. All the three additives reduced the temperature at which the maximum reaction rate was obtained. The maximum mass loss rates of the reduction process both were increased with the addition of Na2CO3 or Na2B407 for 0. 13%/min and 0. 18%/min respectively; while the maximum mass loss rate decreased with the addition of Fe-Si. The mechanism of intensifying reduction of ilmenite were analyzed. The heat generated by the reaction of Si with Fe increases the temperature of reaction system. The mass transfer of the reactant during the reduction prcess is improved with the addition of Na2B407 due to its low melting temperature point, while the gasification reaction of C can be enhanced with the addition of Na2CO3.

关 键 词：钛精矿 添加剂 固相还原 热重法 失重率 

分 类 号：TF533.27[冶金工程—钢铁冶金]