Microstructural Changes and Kinetics of Reduction of Hematite to Magnetite in CO/CO2 Gas Atmospheres

被引：12
|
作者：
Chen, Jiang [1 ]
Zhang, Ruihan [1 ]
Simmonds, Tegan [1 ]
Hayes, Peter C. [1 ]
机构：
[1] Univ Queensland, Pyromet Innovat Ctr PYROSEARCH, Brisbane, Qld 4072, Australia
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2019年 / 50卷 / 06期
基金：
澳大利亚研究理事会;
关键词：
LOW-TEMPERATURE REDUCTION; STRUCTURAL-CHANGES; GASEOUS REDUCTION; MECHANISMS; CRACKING; CRYSTALS; GROWTH;
D O I：
10.1007/s11663-019-01659-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructures of porous magnetite formed on gaseous reduction of dense hematite have been examined using high-resolution scanning electron microscopy. It has been shown that cellular pores are formed on reduction in the temperature range 573 K to 973 K (300 degrees C to 700 degrees C). Dendritic shaped gas pores are formed on reduction at temperatures between 1073 K and 1273 K (800 degrees C and 1000 degrees C). The apparent chemical reaction rate constant for the reduction of hematite to magnetite in CO/CO2 gas mixtures has been derived from measurements of product thickness against reaction time; the rate constant is described by the relation phi(CO) = 0.232exp(76,000/RT) mu m s(-1) atm(-1). (C) The Minerals, Metals & Materials Society and ASM International 2019
引用
收藏
页码：2612 / 2622
页数：11
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