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

来源：

IRONMAKING & STEELMAKING | 2000年 / 27卷 / 02期

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

页码：117 / 122

页数：6