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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第6期    总第250期    2015年6月

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文章编号:1672-7207(2015)06-1989-10
Fe-Cr-Ni-O体系碳还原产物热力学计算及实验分析
刘洋,张延玲,郭文明,贾昕磊

(北京科技大学 钢铁冶金新技术国家重点实验室,北京,100083)

摘 要: 对Fe-Cr-Ni-O体系碳还原产物的组成与特性进行探讨。首先对不同温度及碳氧摩尔比条件下Fe-Cr-Ni-O体系碳还原产物进行热力学分析,然后对Fe-Cr-Ni-O体系及模拟不锈钢粉尘进行等温碳还原实验,并对还原产物进行系统分析。研究结果表明:升高温度有利于体系中各金属氧化物的还原及合金相的生成;当碳氧摩尔比(nC:nO)小于1.0时,体系中金属氧化物尤其是Cr2O3的还原不完全;当碳氧摩尔比大于1.0时,还原产物中容易出现金属碳化物。当碳氧摩尔比为1.0时,渣铁分离效果较好。此外,温度主要影响反应后期的失氧速率,而碳氧摩尔比主要影响样品的最终失氧率,但温度与碳氧摩尔比对反应前期的影响均不大;推断前期主要发生NiO和Fe2O3的还原,而后期主要发生Cr2O3的还原。

 

关键字: Fe-Cr-Ni-O体系;碳;还原产物;合金;金属碳化物

Thermodynamic calculation and experimental analysis of the carbothermal reduction products of Fe-Cr-Ni-O system
LIU Yang, ZHANG Yanling, GUO Wenming, JIA Xinlei

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

Abstract:The composition and characteristics for the carbothermal reduction products of Fe-Cr-Ni-O system were studied. Thermodynamic analysis of the carbothermal reduction products of Fe-Cr-Ni-O system were carried out firstly. Then the carbothermal reduction products of Fe-Cr-Ni-O system and simulative stainless steel dust were investigated through isothermal reduction experiments. The results show that higher temperature is beneficial to both the reduction of metal oxides and the generation of alloys, and the reduction of metal oxides (Cr2O3 particularly) is not complete at nC:nO (the initial molar ratio of C to O in the sample) <1.0, while the metal carbides are easy to appear at nC:nO>1.0. The separation of alloy and slag in the reduction products is good at nC:nO=1.0. Temperature mainly affects the oxygen loss rate in the later stage and nC:nO mainly affects the final reduction degree, while the effect of temperature and nC:nO ratio are not obvious in the early stage. It is speculated that the reduction of NiO and Fe2O3 happens in the early stage while the reduction of Cr2O3 occurs in the later stage.

 

Key words: Fe-Cr-Ni-O system; carbon; reduction products; alloy; metal carbides

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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