Désulfuration de l'acier en poche : synthèse des résultats théoriques et industriels

Riboud, Pénélope; Vassé, R.

doi:10.1051/metal/198582110801

Cited by 14 publications

(3 citation statements)

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“…Desulphurisation requires working with a liquid slag, close to lime saturation, and at low contents in oxides easily reducible by the aluminium from the metal. This is shown by the partition coefficient curves between slag and liquid metal in Figure 11 [11]. To obtain reproducible results in industrial conditions, it is, consequently, essential to control well the slag composition.…”

Section: Steel Desulphurisationmentioning

confidence: 99%

A review: influence of refractories on steel quality

Poirier

2015

Metall. Res. Technol.

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-Chemistry and inclusion control are two of the main keys to the production of quality steel products. The refractory materials have a direct influence on the quality of elaborate grades at different levels: (i) The control of solute elements such as carbon, sulphur, nitrogen, hydrogen, oxygen. (ii) The prevention of non-metallic inclusions. A good knowledge of the metal-slag-refractory products interactions is consequently necessary in order to have a better control of elaboration procedures. Among all the points brought up, we could mention all the developments that will limit the contribution of refractory products in clogging phenomena, carbon pick up and atmospheric re-oxidation, in conjunction with efforts of the metallurgists to produce clean steels.

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Section: Steel Desulphurisationmentioning

confidence: 99%

A review: influence of refractories on steel quality

Poirier

2015

Metall. Res. Technol.

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“…After hot metal pretreatment, it is possible to desulphurize in the secondary refining. In the case of primary refining, oxidizing refining, de-S is not efficient (Riboud and Vasse, 1985;Torres, 2017). RH degasser is one of the reactors frequently used during secondary metallurgy and can perform desulphurization, since high basicity slags and low oxygen potential, required for steel desulphurization, can be achieved (Silva et al, 2021).…”

Section: Thymol Mass Transfer In An Oil-aqueous Solution Systemmentioning

confidence: 99%

Steel desulfurization on RH degasser: physical and mathematical modeling

et al. 2022

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Due to the high-quality steel demand, especially for ultra-low Sulfur steel, RH desulfurization has been practiced. Based on this, mathematical and physical modeling have been applied to study steel desulfurization by reagent addition in the RH degasser vacuum chamber. The main result of cold modeling, using water and oil emulating steel and slag, respectively, was to assess the influence of density difference between the continuous and disperse phases on oil droplet behavior. It is shown that its flow tends to be more restricted near the down snorkel when the density difference increases. Moreover, these results provide the basis for CFD modeling validation, which enabled the determination of slag drop residence time inside steel on RH and the average value of the rate of dissipation of turbulent kinetic energy inside the RH ladle. These two parameters were used to develop a kinetic model, which reaches a good agreement with industrial trial results available in literature. The optimum desulfurization degree of 31.44% was achieved for a gas flow rate of 90 Nm 3 /h, according to the kinetic model. This value can be useful in some steel grade production, where the required S content is less than 10 ppm. Even in common steel grade production, if some punctual chemical adjustment is necessary, this technique is also useful. The main kinetic parameter for steel desulfurization is the steel circulation rate. For best results, it should be reduced in the desulfurization stage, and after that, the normal operation can be resumed, so that the production cycle is not affected.

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“…In numerous natural and industrial processes, chemical reaction is strongly coupled with a fluid flow. In the steel industry, during the secondary metallurgy step, the adjustment of liquid steel composition at high temperature in a ladle involves several chemical reactions between steel and slag [1]. Chemical reactions can be broken down into three stages: transport by convection of reactive species within the liquid phase toward the interface, transport by molecular diffusion through the concentration boundary layer and finally chemical reaction at the interface.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical modelling of mass transfer in a refining ladle

Joubert

Gardin

Popinet

et al. 2022

Metall. Res. Technol.

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Mass transfer between liquid steel and slag is an important physical phenomenon during secondary metallurgy for prediction of the chemical reaction rate and adjustment of liquid steel composition. We study this phenomenon at ambient temperature with a water experiment and perform Direct Numerical Simulations, aiming to reproduce an argon-gas bottom-blown ladle. First, we measure the evolution of the time-averaged open-eye area as a function of the air flow rate. Both simulation and experiment agree relatively well and are close to other water experiments in the literature. Secondly, the mass transfer of thymol between water and oil is investigated. The experimental results show that two mass transfer regimes can be observed. The regime change coincides with atomization of the oil layer resulting in the continuous formation of oil droplets in the water whenever the air flow rate rises above a critical value. The numerical results for the mass-transfer rate or Sherwood number are obtained at small Schmidt numbers and are then extrapolated to the experimental Schmidt number of 1480. A good agreement with experiment is observed although with large error bars. The Sherwood numbers at the two largest simulated flow rates show a steep increase.

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Désulfuration de l'acier en poche : synthèse des résultats théoriques et industriels

Cited by 14 publications

References 0 publications

A review: influence of refractories on steel quality

A review: influence of refractories on steel quality

Steel desulfurization on RH degasser: physical and mathematical modeling

Experimental and numerical modelling of mass transfer in a refining ladle

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