Effect of Na2O on the Reduction of Fe2O3 Compacts with CO/CO2

被引：8

作者：

Pan, Wen ^{[1
]}

Ma, Ze Jun ^{[1
]}

Zhao, Zhi Xing ^{[1
]}

Kim, Wan Ho ^{[2
]}

Min, Dong Joon ^{[2
]}

机构：

[1] Shougang Res Inst Technol, Beijing 100041, Peoples R China

[2] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2012年 / 43卷 / 06期

关键词：

MGO-DOPED FE2O3; CAO AND/OR MGO; IRON-OXIDE COMPACTS; CARBON-MONOXIDE; 1173-1473; K; DEGRADATION BEHAVIOR; STEPWISE REDUCTION; HEMATITE COMPACTS; GASEOUS REDUCTION; BLAST-FURNACE;

D O I：

10.1007/s11663-012-9738-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Compacts of Fe2O3 and Fe2O3 doped with varying amounts of Na2O were isothermally reduced at several temperatures, using CO/CO2 mixed gas in a vertical resistance furnace. To determine the effect of Na2O on the reduction of Fe2O3 compacts, the mass loss due to oxygen removal was continuously recorded, from which the reduction rate and rate constant were obtained. Na2O was found to retard the reduction of Fe2O3 compacts. The apparent activation energy (E (a)) of reaction and the mathematical relationship for pore gas diffusion suggested that the reduction behavior at the initial stages was controlled by a combination of pore gas diffusion and interfacial chemical reaction. At the intermediate and late stages of reduction, pore gas diffusion was the sole contributing factor. Morphological examination of the reduced compacts showed the formation of a liquid phase during the reduction process, which appeared to lower the rate of reaction. DOI: 10.1007/s11663-012-9738-z (C) The Minerals, Metals & Materials Society and ASM International 2012

引用

页码：1326 / 1337

页数：12

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