Low Temperature Reduction of Hematite in Red-Mud to Magnetite

被引:12
作者
Gostu, Sumedh [1 ]
Mishra, Brajendra [1 ]
Martins, Gerard P. [2 ]
机构
[1] Worcester Polytech Inst, Dept Mat Sci & Engn, Worcester, MA 01609 USA
[2] Colorado Sch Mines, Dept Met & Mat Engn, Golden, CO 80401 USA
来源
LIGHT METALS 2017 | 2017年
基金
美国国家科学基金会;
关键词
Red-mud; Reduction; Magnetite; Bauxite residue; IRON; SEPARATION;
D O I
10.1007/978-3-319-51541-0_10
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Red-mud, the residue generated from the Bayers processing of bauxite ore in Jamaica was subjected to a low temperature reduction process. Hematite (similar to 60 m%) was reduced to magnetite employing a gas based mixture of CO, CO2 and N-2 as a diluent. Extensive thermodynamic study was conducted to identify the stability region for magnetite. 'Optimal conditions' for the gas-phase reduction were determined to be: a processing temperature of 540 degrees C +/- 10 degrees C, partial pressures CO(g) and CO2(g) each of 0.070 atm (bar) +/- 0.001 atm (bar)/inert diluent-gas: N-2(g), for a conversion-time of 30 min. Mathematical model for reduction based on unidirectional diffusion is also formulated in this paper.
引用
收藏
页码:67 / 73
页数:7
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