Decomposition Behavior of Limestone Powder in Converter Flue Gas: Effect of Fe-Oxide Dust on Calcium Ferrite Formation

IF 1.9 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

steel research international Pub Date : 2024-10-25 DOI:10.1002/srin.202400383

Xiaoqing Chen, Nan Wang, Jianan Zhou, Yi Wang

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Abstract

To improve the utilization level and energy conversion efficiency of converter flue gas, a novel technology is proposed for the online production of slagging and dephosphorization agent by utilizing the waste heat of converter flue gas. Herein, the effects of Fe-oxide dust in converter flue gas on the phase composition and microstructure of decomposed product and decomposition degree are investigated by high-temperature drop tube furnace experiment and thermogravimetric experiment to clarify the influencing mechanism of Fe-oxide dust on limestone powder decomposition. The results show that Ca₂Fe₂O₅ is formed during limestone decomposition in the flue gas with Fe-oxide dust, and the increase of Fe-oxide dust content promotes the decomposition reaction of limestone powder and formation of calcium ferrite. With the Fe-oxide dust content increasing from 10% to 30%, the decomposition degree increases from 80.1% to 96.2% and the proportion of Ca₂Fe₂O₅ increases from 6.35% to 35.90%. Moreover, FeO in the dust reacts with both CaCO₃ and CaO completely to form calcium ferrite with the presence of external oxygen gas in converter flue gas, whereas FeO has no significant effect on the decomposition of CaCO₃ in an inert atmosphere and no Ca₂Fe₂O₅ is formed.

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石灰石粉在转炉烟气中的分解行为：氧化铁粉尘对铁酸钙形成的影响

为提高转炉烟气的利用水平和能量转化效率，提出了利用转炉烟气余热在线生产结渣脱磷剂的新技术。本文通过高温降管炉实验和热重实验，研究了转炉烟气中氧化铁粉尘对分解产物物相组成、微观结构及分解程度的影响，阐明氧化铁粉尘对石灰石粉分解的影响机理。结果表明：氧化铁粉尘在烟气中分解石灰石时生成Ca2Fe2O5，氧化铁粉尘含量的增加促进了石灰石粉的分解反应和铁酸钙的生成。随着Fe-oxide粉尘含量从10%增加到30%，分解度从80.1%增加到96.2%，Ca2Fe2O5的比例从6.35%增加到35.90%。此外，在转炉烟气中有外氧存在的情况下，粉尘中的FeO与CaCO3和CaO完全反应生成铁酸钙，而FeO在惰性气氛下对CaCO3的分解没有显著影响，没有Ca2Fe2O5的生成。

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来源期刊

steel research international 工程技术-冶金工程

CiteScore

3.30

自引率

18.20%

发文量

319

审稿时长

1.9 months

期刊介绍： steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming