Studies on Decarburisation and Desiliconisation of Levitated Fe–C–Si Alloy Droplets

Widlund, Daniel; Sarma, Darbha Subraanranya; Jönsson, Pär G.

doi:10.2355/isijinternational.46.1149

Cited by 13 publications

(9 citation statements)

References 19 publications

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“…Widlund et al 45 Chemical rate is one order of magnitude larger than previously measured when the rate was controlled by liquid phase mass transfer. Re-examined the reaction constant measured by Fruehan et al 2004 Kim et al 46) C: 0.0019-3.3100 O: 0.0020-0.6170 S: 0.0026-0.018 N:0.003-0.0821…”

Section: 1999mentioning

confidence: 90%

“…Widlund et al 45) investigated the decarburization of Fe-4%C alloys containing silicon in the 0.3 to 0.7% range under a He + O 2 gas mixture. The results show that at high carbon content ( > 0.5%), the decarburization rate is not dependent on the carbon concentration in the liquid steel.…”

Section: (4)mentioning

confidence: 99%

“…However, the results are not always consistent and even contradict each other, particularly in the rate-limit step of the C-O reaction, i.e. carbon and/or oxygen diffusion in the liquid steel, 28,29,[34][35][36][37][38] gaseous diffusion in the gas phase, 30,31,[39][40][41][42][43][44][45] and interfacial reactions. 33,46) Moreover, in the literature it is constantly assumed that the CO absorption and desorption process are symmetrical, meaning the rate-limiting step of the two reactions is the same and the overall reaction rate is equivalent under the same experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

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CO Desorption and Absorption in Molten Steel: A Review

et al. 2021

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Previous work on the mechanism of carbon monoxide absorption and desorption from liquid steel/iron is reviewed. The experimental setup employed in these studies is summarized and the characteristics of each methodology are discussed and compared. The reaction kinetics, particularly the rate-limiting step of the CO gas-molten steel/iron reaction is analysed with respect to experimental parameters, comprising temperature, CO partial pressure in the gas mixture, gas flow rate, crucible materials, and carbon and oxygen content in the steel/iron. To further understand the CO absorption and desorption mechanisms in liquid steel, suggestions for future work are provided.

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Section: 1999mentioning

confidence: 90%

Section: (4)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO Desorption and Absorption in Molten Steel: A Review

et al. 2021

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“…The calculations were continued until the carbon concentration reached 1.0 wt% above which the rate controlling step is evident to be the gas phase mass transfer control. 1,4,[16][17][18] …”

Section: Methodsmentioning

confidence: 99%

“…A number of experimental investigations on decarburization characteristics of molten Fe-C alloys have been carried out by using a levitation melting technique, [1][2][3][4][5] and they reported the decarburization rate of iron droplets under different conditions (various oxidant gas, flow rate, reaction temperature controlled by temperature of droplets). Generally, in a BOF primary steelmaking process, the ratecontrolling step of decarburization is known to be the mass transfer in the gas phase as long as C concentration in liquid iron is high.…”

Section: Introductionmentioning

confidence: 99%

Decarburization of Molten Fe–C Droplet: Numerical Simulation and Experimental Validation

et al. 2014

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Decarburization of Fe-C droplet was investigated by fluid dynamics numerical simulation based on physical properties under gas phase mass transfer controlled regime. Fluid flow and species concentration fields around the droplet implementing a reaction of carbon with oxidant gas at the interface were calculated by a commercial CFD package which solves a set of transport equations. Overall decarburization rate of the molten Fe-C droplet was obtained by the simulation, and it was additionally validated by the present authors' own experiment using gas-liquid drop reaction in a levitation melting equipment. It was observed by the simulation that decarburization rate on the surface of a droplet was not homogeneous due to inhomogeneous gas distribution around the droplet. A new concept of local mass transfer coefficient ratio was proposed in the present study as a ratio of effective local mass transfer coefficient at a specific site over average mass transfer coefficient, as a function of θ (angle between direction of gas flow and direction to reaction site on the droplet surface from the droplet center) and dimensionless numbers regarding fluid flow:Furthermore, effect of distance between two droplets was investigated by the present numerical model for decarburization of multiple droplets. The local mass transfer coefficient was found to have a significant impact on decarburization rate of a droplet when the other droplet locates very close. Relation between decarburization rate of two droplets and distance between them were analyzed.

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