{"title":"Decomposition Behavior of Limestone Powder in Converter Flue Gas: Effect of Fe-Oxide Dust on Calcium Ferrite Formation","authors":"Xiaoqing Chen, Nan Wang, Jianan Zhou, Yi Wang","doi":"10.1002/srin.202400383","DOIUrl":null,"url":null,"abstract":"<p>\nTo 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 Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> 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 Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> increases from 6.35% to 35.90%. Moreover, FeO in the dust reacts with both CaCO<sub>3</sub> 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 CaCO<sub>3</sub> in an inert atmosphere and no Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub> is formed.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 3","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"steel research international","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/srin.202400383","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
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.
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.
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