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为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,以石墨为还原剂,研究了还原温度、还原时间对低镁钒钛磁铁矿内配碳球团还原过程的影响,并进行了反应动力学研究,并采用扫描电镜-能谱仪(SEM-EDS)等分析方法对还原控制机制进行了分析。通过计算分析确定低镁钒钛磁铁矿还原过程限制性环节为O原子在产物层内的扩散,反应表观活化能为228.80 k J/mol。研究结果表明,低镁钒钛磁铁矿与攀西地区钒钛磁铁矿相比,易于还原。当还原温度超过1 200℃时,球团均能快速进行反应;延长还原反应时间,还原产生的金属铁从矿物颗粒外表面到内部依次析出,球团内部新生相界面逐渐清晰。
In order to exploit the low-Mg vanadium titanomagnetite resources in Chaoyang area of Liaoning and graphite as the reductant, the effects of reduction temperature and reduction time on the reduction process of carbon spheres with low Mg-vanadium titanomagnetism were studied and the reaction was carried out Kinetics, and the reduction control mechanism was analyzed by SEM-EDS and other analytical methods. Through calculation and analysis, it was confirmed that the limiting atom of the reduction of O atom in the low magnesium vanadium titanomagnetite was diffusion in the product layer, and the apparent activation energy was 228.80 kJ / mol. The results show that low magnesium vanadium titanomagnetite is easier to reduce than vanadium titanomagnetite in Panxi area. When the reduction temperature exceeds 1 200 ℃, the pellets can react rapidly. Extending the reduction reaction time, the metal iron produced by the reduction precipitates sequentially from the outer surface of the mineral particles to the interior, and the interface of the nascent phases in the pellets gradually becomes clear.