Development of a Novel Degassing Process Consisting with Single Large Immersion Snorkel and a Bottom Bubbling Ladle.

Kitamura, Shin Ya; Aoki, Hiroyuki; Miyamoto, Ken; Furuta, Hitoshi; Yamashita, Kozo; Yonezawa, Kimitoshi

doi:10.2355/isijinternational.40.455

Cited by 27 publications

(23 citation statements)

References 5 publications

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“…[1,5,7,29,32,34] The effective reaction zone volume for the decarburization at the rising Ar bubble and bath surface, V surf (kg/circulation cycle), was derived from the diffusion rate (mass transfer) of C from the bulk steel to the interface (bath and bubble surface), which is expressed as follows:…”

Section: Bath and Ar Bubble Surface Reactionsmentioning

confidence: 99%

A Kinetic Model for the Ruhrstahl Heraeus (RH) Degassing Process

Ende

Kim

Cho

et al. 2011

Metall Mater Trans B

119

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A kinetic model (effective equilibrium reaction zone model) was developed to simulate the decarburization reaction in the Ruhrstahl Heraeus (RH) degassing process. The model assumes that the chemical reactions reach equilibrium in the designated effective reaction volumes near the reaction interfaces. After the RH degassing process was divided into various reaction zones, the effective reaction volumes of each reaction zone were expressed as a function of the process conditions based on the physical descriptions of the reaction mechanisms. The influence of the chemical reaction between the RH slag and the RH steel to the decarburization phenomena was considered for the first time. The calculated C and O profiles by the present model are in good agreement with the industrial operation data for various steel compositions and process conditions. RH slag can serve as an oxygen reservoir to supply O during the RH decarburization process, which induces the observed deviation of the C and O contents from their ideal stoichiometric trajectory. The present model provides an efficient tool to understand the RH degassing process.

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Section: Bath and Ar Bubble Surface Reactionsmentioning

confidence: 99%

A Kinetic Model for the Ruhrstahl Heraeus (RH) Degassing Process

Ende

Kim

Cho

et al. 2011

Metall Mater Trans B

119

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“…The reaction mechanisms can be divided into the following three types; surface reaction, bubble reaction and inner reaction. The authors has already clarified that the surface reaction had a predominant role in the low carbon period [10]. By one of the authors, the ruling factor of the surface reaction was discussed and the importance of the plume eye area was stressed [10].…”

Section: Evatuation Of Reaction Rate At Bath Surface In Gas Liquid Symentioning

confidence: 99%

Fundamental Researches on the High-speed and High-efficiency Steelmaking Reaction

Kitamura

Shibata

Maruoka

2012

High Temperature Materials and Processes

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Traditionally, steelmaking reactions have been analyzed by thermodynamics. Recently, software packages that can be used to calculate the equilibrium conditions have improved greatly. In some cases, information obtained in this software is useful for analyzing the steelmaking reaction. On the other hand, in industrial operation, steelmaking reactions, i.e., decarburization, dephosphorization, desulfurization or nitrogen removal, do not reach the equilibrium condition. Therefore, the kinetic model is very important for gaining a theoretical understanding of the steelmaking reaction. In this paper, the following recent research activities were shown; 1) mass transfer of impurities between solid oxide and liquid slag, 2) simulation model of hot metal dephosphorization by multiphase slag, 3) evaluation of reaction rate at bath surface in gas-liquid reaction system and 4) condition for forming of metal emulsion by bottom bubbling.

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“…12) Kitamura et al showed that as a result of the gas bubbling into the molten steel the decarburization reaction is promoted at the perturbed metal surface by the argon bubble burst position; 13) based on this result, a simulation model of the industrial decarburization process (RH-type, 14) new type degassing: REDA 15) ) was created. The primary feature of this model is dividing the reaction site into three parts: the bath surface, the argon bubble surface, and the inner site where CO boiling occurs.…”

Section: Effect Of the Chromium Content And Argon Bubbling In The Carmentioning

confidence: 99%

Effect of the Chromium Content and Argon Bubbling in the Carbon Removal Rate from Low Carbon Liquid Steel under Reduced Pressure Condition

2016

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Development of a Novel Degassing Process Consisting with Single Large Immersion Snorkel and a Bottom Bubbling Ladle.

Cited by 27 publications

References 5 publications

A Kinetic Model for the Ruhrstahl Heraeus (RH) Degassing Process

A Kinetic Model for the Ruhrstahl Heraeus (RH) Degassing Process

Fundamental Researches on the High-speed and High-efficiency Steelmaking Reaction

Effect of the Chromium Content and Argon Bubbling in the Carbon Removal Rate from Low Carbon Liquid Steel under Reduced Pressure Condition

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