Effect of basicity on the reduction swelling properties of iron ore briquettes

The influence mechanism of basicity on the reduction swelling index (RSI) of iron ore briquettes was investigated using the SEM analysis and Factsage 7.3 thermodynamic calculations based on the addition of pure CaO to Bayan Obo iron concentrate. The results revealed that the solid solution of Ca2+ i...

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Autores principales:	Zhang Guo-Cheng, Luo Guo-Ping, Jia Peng-Fei, Wang Yi-Ci, Chai Yi-Fan
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bayan obo iron concentrate briquettes basicity reduction swelling index Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
Acceso en línea:	https://doaj.org/article/bcd095bc530345a7b95b5b961cf20da2
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id	oai:doaj.org-article:bcd095bc530345a7b95b5b961cf20da2
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spelling	oai:doaj.org-article:bcd095bc530345a7b95b5b961cf20da22021-12-05T14:10:50ZEffect of basicity on the reduction swelling properties of iron ore briquettes2191-032410.1515/htmp-2021-0027https://doaj.org/article/bcd095bc530345a7b95b5b961cf20da22021-06-01T00:00:00Zhttps://doi.org/10.1515/htmp-2021-0027https://doaj.org/toc/2191-0324The influence mechanism of basicity on the reduction swelling index (RSI) of iron ore briquettes was investigated using the SEM analysis and Factsage 7.3 thermodynamic calculations based on the addition of pure CaO to Bayan Obo iron concentrate. The results revealed that the solid solution of Ca2+ in the FeO lattice increased with the basicity of the briquettes, whereas the diffusion channels of Fe2+ ions increased during the reduction process from FeO to Fe and resulted in the formation of a great number of slender and anisotropic iron whiskers, which consequently increased the RSI. Furthermore, the melting point of the slag phase decreased as the CaO content increased; this reduced its ability to resist the reduction swelling of iron oxides. When the basicity was increased from 0.3 to 0.8, the RSI reached a maximum of 69.85%. However, due to the saturated solid solution of Ca2+ in FeO lattice, as the basicity further increased from 0.8 to 1.2, excess CaO melting into the slag phase promoted the precipitation of spinel minerals with high melting points and difficult reduction properties. Thus, the diffusion of Fe2+ and the growth of the iron whiskers were hindered, and the RSI was reduced.Zhang Guo-ChengLuo Guo-PingJia Peng-FeiWang Yi-CiChai Yi-FanDe Gruyterarticlebayan obo iron concentratebriquettesbasicityreduction swelling indexTechnologyTChemical technologyTP1-1185Chemicals: Manufacture, use, etc.TP200-248ENHigh Temperature Materials and Processes, Vol 40, Iss 1, Pp 193-203 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bayan obo iron concentrate briquettes basicity reduction swelling index Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
spellingShingle	bayan obo iron concentrate briquettes basicity reduction swelling index Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248 Zhang Guo-Cheng Luo Guo-Ping Jia Peng-Fei Wang Yi-Ci Chai Yi-Fan Effect of basicity on the reduction swelling properties of iron ore briquettes
description	The influence mechanism of basicity on the reduction swelling index (RSI) of iron ore briquettes was investigated using the SEM analysis and Factsage 7.3 thermodynamic calculations based on the addition of pure CaO to Bayan Obo iron concentrate. The results revealed that the solid solution of Ca2+ in the FeO lattice increased with the basicity of the briquettes, whereas the diffusion channels of Fe2+ ions increased during the reduction process from FeO to Fe and resulted in the formation of a great number of slender and anisotropic iron whiskers, which consequently increased the RSI. Furthermore, the melting point of the slag phase decreased as the CaO content increased; this reduced its ability to resist the reduction swelling of iron oxides. When the basicity was increased from 0.3 to 0.8, the RSI reached a maximum of 69.85%. However, due to the saturated solid solution of Ca2+ in FeO lattice, as the basicity further increased from 0.8 to 1.2, excess CaO melting into the slag phase promoted the precipitation of spinel minerals with high melting points and difficult reduction properties. Thus, the diffusion of Fe2+ and the growth of the iron whiskers were hindered, and the RSI was reduced.
format	article
author	Zhang Guo-Cheng Luo Guo-Ping Jia Peng-Fei Wang Yi-Ci Chai Yi-Fan
author_facet	Zhang Guo-Cheng Luo Guo-Ping Jia Peng-Fei Wang Yi-Ci Chai Yi-Fan
author_sort	Zhang Guo-Cheng
title	Effect of basicity on the reduction swelling properties of iron ore briquettes
title_short	Effect of basicity on the reduction swelling properties of iron ore briquettes
title_full	Effect of basicity on the reduction swelling properties of iron ore briquettes
title_fullStr	Effect of basicity on the reduction swelling properties of iron ore briquettes
title_full_unstemmed	Effect of basicity on the reduction swelling properties of iron ore briquettes
title_sort	effect of basicity on the reduction swelling properties of iron ore briquettes
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/bcd095bc530345a7b95b5b961cf20da2
work_keys_str_mv	AT zhangguocheng effectofbasicityonthereductionswellingpropertiesofironorebriquettes AT luoguoping effectofbasicityonthereductionswellingpropertiesofironorebriquettes AT jiapengfei effectofbasicityonthereductionswellingpropertiesofironorebriquettes AT wangyici effectofbasicityonthereductionswellingpropertiesofironorebriquettes AT chaiyifan effectofbasicityonthereductionswellingpropertiesofironorebriquettes
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Effect of basicity on the reduction swelling properties of iron ore briquettes

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