Metallurgical reaction behavior of CO<sub>2</sub> as RH lifting gas

WEI Guang-sheng; HAN Bao-chen; ZHU Rong

doi:10.13374/j.issn2095-9389.2019.06.30.001

Volume 42 Issue 2

Feb. 2020

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WEI Guang-sheng, HAN Bao-chen, ZHU Rong. Metallurgical reaction behavior of CO2 as RH lifting gas[J]. Chinese Journal of Engineering, 2020, 42(2): 203-208. doi: 10.13374/j.issn2095-9389.2019.06.30.001

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WEI Guang-sheng, HAN Bao-chen, ZHU Rong. Metallurgical reaction behavior of CO₂ as RH lifting gas[J]. Chinese Journal of Engineering, 2020, 42(2): 203-208. doi: 10.13374/j.issn2095-9389.2019.06.30.001

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Metallurgical reaction behavior of CO₂ as RH lifting gas

doi: 10.13374/j.issn2095-9389.2019.06.30.001

WEI Guang-sheng^{1, 2},
HAN Bao-chen¹,
ZHU Rong^{1, 2
,
,}

1.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China

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Corresponding author: E-mail: zhurong12001@126.com
Received Date: 2019-06-30
Publish Date: 2020-02-01

Abstract

Abstract

Developing new technologies that can utilize CO₂ as a resource or reduce CO₂ emission is an urgent need in the iron and steel industry. The Ruhrstahl-Heraeus (RH) refining process can effectively remove gas and inclusions from molten steel by applying a high vacuum and intense circulation flow of the molten steel. Meanwhile, at the steelmaking temperature, CO₂ can react with carbon in the molten steel to generate CO bubbles, and this enhances the molten bath stirring strength. Therefore, a technology involving the use of CO₂ as the lifting gas in RH refining was proposed. To study the applicability of CO₂ in RH refining, the favorable conditions and limits of CO₂ decarburization under vacuum conditions were analyzed through thermodynamics. Meanwhile, an industrial test platform for CO₂ as RH lifting gas was set up, and the effects of CO₂/Ar as lifting gas on the refining process of molten steel were comparatively studied through industrial tests. The results show that if only the reaction between CO₂ and carbon is considered, CO₂ can still oxidize carbon elements when the carbon content is less than 1.8×10^?6. However, CO₂ selectively oxidizes carbon and aluminum in molten steel. When the aluminum content is below a certain level, CO₂ mainly participates in a decarburization reaction; otherwise, CO₂ will cause certain aluminum loss. Therefore, if the new process is adopted, the timing and amount of aluminum alloy addition should be considered. In addition, CO₂ can be used as RH lifting gas to obtain a dehydrogenation effect equivalent to or even better than that of Ar. Meanwhile, injecting the same amount of CO₂ did not cause a large temperature drop of molten steel; therefore, CO₂ has the potential to be used as RH lifting gas to complete refining.
- carbon dioxide,
- RH refining,
- decarburization reaction,
- dehydrogenation effect,
- temperature drop

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References(23)

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