The investigation on the middle period dephosphorization in 70t converter
An experimental test is carried out on the 70t converter in Masteel to study the law of middle period dephosphorization in the smelting period. It is found that the dephosphorization rate is slow in the early and middle period of smelting and the content of the final P in steel cannot reach the stan...
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De Gruyter
2020-11-01
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Series: | High Temperature Materials and Processes |
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Online Access: | https://doi.org/10.1515/htmp-2020-0094 |
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doaj-133e7062019147ceb428dfb40c1ec4c52021-09-06T19:19:58ZengDe GruyterHigh Temperature Materials and Processes0334-64552191-03242020-11-0139156757510.1515/htmp-2020-0094htmp-2020-0094The investigation on the middle period dephosphorization in 70t converterNanyang Deng0Haijun Wang1Haitao Ling2Jianjun Wang3School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243000, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243000, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243000, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243000, ChinaAn experimental test is carried out on the 70t converter in Masteel to study the law of middle period dephosphorization in the smelting period. It is found that the dephosphorization rate is slow in the early and middle period of smelting and the content of the final P in steel cannot reach the standard due to the low oxidation of slag. The content of the final P in steel can be controlled within 0.02% by adding ore to the molten bath in the middle period and raising the lance position. The experimental test shows that the dephosphorization can still be achieved by a large margin if appropriate slag conditions are maintained in the middle period when the C and O reactions are strong. By theoretical calculation, it is concluded that the slag content should be controlled between 15 and 23%, and the basicity of slag should be between 2.5 and 2.8 in the middle period of production. Through the observation of experimental slag by SEM, it is found that the limiting factor of dephosphorization in the middle period under the test conditions is that the dephosphorization speed is too slow due to the low oxidation, rather than the solidification of phosphorus.https://doi.org/10.1515/htmp-2020-0094converterdephosphorizationmiddle period slagslag phase |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nanyang Deng Haijun Wang Haitao Ling Jianjun Wang |
spellingShingle |
Nanyang Deng Haijun Wang Haitao Ling Jianjun Wang The investigation on the middle period dephosphorization in 70t converter High Temperature Materials and Processes converter dephosphorization middle period slag slag phase |
author_facet |
Nanyang Deng Haijun Wang Haitao Ling Jianjun Wang |
author_sort |
Nanyang Deng |
title |
The investigation on the middle period dephosphorization in 70t converter |
title_short |
The investigation on the middle period dephosphorization in 70t converter |
title_full |
The investigation on the middle period dephosphorization in 70t converter |
title_fullStr |
The investigation on the middle period dephosphorization in 70t converter |
title_full_unstemmed |
The investigation on the middle period dephosphorization in 70t converter |
title_sort |
investigation on the middle period dephosphorization in 70t converter |
publisher |
De Gruyter |
series |
High Temperature Materials and Processes |
issn |
0334-6455 2191-0324 |
publishDate |
2020-11-01 |
description |
An experimental test is carried out on the 70t converter in Masteel to study the law of middle period dephosphorization in the smelting period. It is found that the dephosphorization rate is slow in the early and middle period of smelting and the content of the final P in steel cannot reach the standard due to the low oxidation of slag. The content of the final P in steel can be controlled within 0.02% by adding ore to the molten bath in the middle period and raising the lance position. The experimental test shows that the dephosphorization can still be achieved by a large margin if appropriate slag conditions are maintained in the middle period when the C and O reactions are strong. By theoretical calculation, it is concluded that the slag content should be controlled between 15 and 23%, and the basicity of slag should be between 2.5 and 2.8 in the middle period of production. Through the observation of experimental slag by SEM, it is found that the limiting factor of dephosphorization in the middle period under the test conditions is that the dephosphorization speed is too slow due to the low oxidation, rather than the solidification of phosphorus. |
topic |
converter dephosphorization middle period slag slag phase |
url |
https://doi.org/10.1515/htmp-2020-0094 |
work_keys_str_mv |
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