Effect of K and Na on reduction swelling performance of oxidized roasted briquettes

The presence of potassium oxide (K2O) and sodium oxide (Na2O) causes high reduction swelling of pellets of Bayan Obo iron concentrate during reduction and thus affects the permeability of blast gases during blast furnace operations. The influencing mechanism of K2O and Na2O on the swelling behavior...

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Autores principales:	Song Wei, Luo Guo-Ping, Sun Chen-Chen, Zhang Jing, Zhu Jian-Guo
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	australian ore briquettes k2o and na2o reduction swelling crystal structure Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
Acceso en línea:	https://doaj.org/article/bad70acc8d9c4eed91086f3f0064d764
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spelling	oai:doaj.org-article:bad70acc8d9c4eed91086f3f0064d7642021-12-05T14:10:50ZEffect of K and Na on reduction swelling performance of oxidized roasted briquettes2191-032410.1515/htmp-2020-0091https://doaj.org/article/bad70acc8d9c4eed91086f3f0064d7642021-07-01T00:00:00Zhttps://doi.org/10.1515/htmp-2020-0091https://doaj.org/toc/2191-0324The presence of potassium oxide (K2O) and sodium oxide (Na2O) causes high reduction swelling of pellets of Bayan Obo iron concentrate during reduction and thus affects the permeability of blast gases during blast furnace operations. The influencing mechanism of K2O and Na2O on the swelling behavior of reduction reactions (1) Fe2O3 → Fe3O4, (2) Fe3O4 → FexO, and (3) FexO → Fe was researched by adding (K2O + Na2O) to Australian fine ore briquettes. The mineral composition and structure of the briquettes, as well as the reduction swelling after the three reactions coupled with the morphology and lattice parameters of the reduced products, were studied. From the results, the swelling index with 0.6% (K2O + Na2O) added was 8.52%, 7.91%, and 33.81%, respectively, and without were 12.36%, 3.27%, and 12.61%, respectively, for the three reactions. The swelling index of the first reaction (Fe2O3 → Fe3O4) is reduced because alkali metal suppresses crystal cracking. The swelling mainly occurs at the third stage (FexO → Fe), because K2O and Na2O enhance the oriented growth of iron whiskers, as well as make them smaller. Crystal transformation does not occur at the second stage (Fe3O4 → FexO) and the reduction swelling is small, but the swelling index of the briquettes with added with K2O and Na2O increases (7.91% compared to 3.27%). The main reason is that the alkali metal reduces the melting point of the slag phase and promotes the cascade crystallization of FeO. Therefore, the abnormal swelling of briquettes caused by K and Na is mainly caused by the growth of iron whiskers at the third stage.Song WeiLuo Guo-PingSun Chen-ChenZhang JingZhu Jian-GuoDe Gruyterarticleaustralian orebriquettesk2o and na2oreduction swellingcrystal structureTechnologyTChemical technologyTP1-1185Chemicals: Manufacture, use, etc.TP200-248ENHigh Temperature Materials and Processes, Vol 40, Iss 1, Pp 241-252 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	australian ore briquettes k2o and na2o reduction swelling crystal structure Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
spellingShingle	australian ore briquettes k2o and na2o reduction swelling crystal structure Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248 Song Wei Luo Guo-Ping Sun Chen-Chen Zhang Jing Zhu Jian-Guo Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
description	The presence of potassium oxide (K2O) and sodium oxide (Na2O) causes high reduction swelling of pellets of Bayan Obo iron concentrate during reduction and thus affects the permeability of blast gases during blast furnace operations. The influencing mechanism of K2O and Na2O on the swelling behavior of reduction reactions (1) Fe2O3 → Fe3O4, (2) Fe3O4 → FexO, and (3) FexO → Fe was researched by adding (K2O + Na2O) to Australian fine ore briquettes. The mineral composition and structure of the briquettes, as well as the reduction swelling after the three reactions coupled with the morphology and lattice parameters of the reduced products, were studied. From the results, the swelling index with 0.6% (K2O + Na2O) added was 8.52%, 7.91%, and 33.81%, respectively, and without were 12.36%, 3.27%, and 12.61%, respectively, for the three reactions. The swelling index of the first reaction (Fe2O3 → Fe3O4) is reduced because alkali metal suppresses crystal cracking. The swelling mainly occurs at the third stage (FexO → Fe), because K2O and Na2O enhance the oriented growth of iron whiskers, as well as make them smaller. Crystal transformation does not occur at the second stage (Fe3O4 → FexO) and the reduction swelling is small, but the swelling index of the briquettes with added with K2O and Na2O increases (7.91% compared to 3.27%). The main reason is that the alkali metal reduces the melting point of the slag phase and promotes the cascade crystallization of FeO. Therefore, the abnormal swelling of briquettes caused by K and Na is mainly caused by the growth of iron whiskers at the third stage.
format	article
author	Song Wei Luo Guo-Ping Sun Chen-Chen Zhang Jing Zhu Jian-Guo
author_facet	Song Wei Luo Guo-Ping Sun Chen-Chen Zhang Jing Zhu Jian-Guo
author_sort	Song Wei
title	Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
title_short	Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
title_full	Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
title_fullStr	Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
title_full_unstemmed	Effect of K and Na on reduction swelling performance of oxidized roasted briquettes
title_sort	effect of k and na on reduction swelling performance of oxidized roasted briquettes
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/bad70acc8d9c4eed91086f3f0064d764
work_keys_str_mv	AT songwei effectofkandnaonreductionswellingperformanceofoxidizedroastedbriquettes AT luoguoping effectofkandnaonreductionswellingperformanceofoxidizedroastedbriquettes AT sunchenchen effectofkandnaonreductionswellingperformanceofoxidizedroastedbriquettes AT zhangjing effectofkandnaonreductionswellingperformanceofoxidizedroastedbriquettes AT zhujianguo effectofkandnaonreductionswellingperformanceofoxidizedroastedbriquettes
_version_	1718371685979127808

Effect of K and Na on reduction swelling performance of oxidized roasted briquettes

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