Behaviour of manganese oxides during magnetising reduction of Baharia iron ore by CO-CO2 gas mixture

被引:25
作者
El-Geassy, AA [1 ]
Nasr, MI [1 ]
Yousef, MA [1 ]
Khedr, MH [1 ]
Bahgat, M [1 ]
机构
[1] Cent Met Res & Dev Inst, Cairo, Egypt
关键词
Carbon dioxide - Carbon monoxide - Cleaning - Grain size and shape - Magnetic separation - Manganese compounds - Oxides - Reaction kinetics - X ray analysis;
D O I
10.1179/030192300677417
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
High manganese containing iron ore samples were isothermally reduced with a CO-CO2 gas mixture at 600-1000 degrees C. The course of reduction was followed by a weight loss technique. The influence of reducing gas composition and temperature on the reduction kinetics was investigated. The different phases formed during reduction were identified by X-ray phase analysis, while their structures were microscopically examined. The reduced samples were magnetically tested by means of a Davis tube tester. The effect of grain size, drum speed, and cleaning conditions on the efficiency of magnetic separation was studied using a Box-Mag wet low intensity magnetic separator. The separation efficiency was determined by analysing total iron, manganese, and acid insoluble contents in both magnetic and non-magnetic fractions. Best testing results were obtained on separation of the sample reduced with 80CO-20CO(2) (vol,-%) at 800 degrees C. The optimum grain size for magnetic separation is below 0.15 mm while that of the drum speed is 100 rev min(-1). The cleaning of the magnetic fraction increases the iron content and decreases the manganese and acid insoluble contents.
引用
收藏
页码:117 / 122
页数:6
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