Alkali reductive roasting of ilmenite ore

被引：64
作者：
ElTawil, SZ
Morsi, IM
Yehia, A
Francis, AA
机构：
[1] Central Metallurgical Research and, Development Inst, Helwan
来源：
CANADIAN METALLURGICAL QUARTERLY | 1996年 / 35卷 / 01期
关键词：
D O I：
10.1016/0008-4433(95)00039-9
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Reductive roasting of ilmenite ore by carbon in the presence of sodium carbonate was carried out at 1000-1200 degrees C for periods of up to 180 min. Additions of sodium carbonate of up to 30 wt% of the ore enhanced the reduction efficiency. The maximum metallization obtained at 1200 degrees C was about 85%, and the rest of the iron exists in the form of sodium-iron-titanates. The type of sodium compound formed in the final product depends on the roasting temperature. The reduction rate data under isothermal conditions were represented by a phase-boundary reaction model for conversions of up to 70 wt%. The apparent activation energy obtained is about 67 kJ/mol. Magnetic separation of roasted products gave different magnetic fractions having different Fe/TiO2 ratios (ranging from 2-3) as well as a non-magnetic fraction that was low in iron and suitable for titanium dioxide production.
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页码：31 / 37
页数：7
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