Use of computational thermodynamics software to determine the influence of CaO, FeO and SiO2 on hot metal dephosphorization efficiency

Silva, Caio Vaccari; Broseghini, Felipe Costa; Junca, Eduardo; Grillo, Felipe Fardin; Oliveira, José Roberto de

doi:10.1016/j.jmrt.2020.07.036

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…From this aspect, CaO with some SiO 2 impurities would be beneficial for the dephosphorisation of BOF crude steel, and it can reduce the cost of the dephosphorisation agent. Note that in the studies of Guo et al [29] and Silva et al [30], it was found that the effect of SiO 2 in the CaO-based flux was negative for dephosphorisation owing to lower basicity. Obviously, the present study has a different conclusion.…”

Section: Resultsmentioning

confidence: 96%

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Deng

Yan

Zhu

et al. 2021

Ironmaking & Steelmaking

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A dephosphorisation technology using CaO-based flux during the tapping process of basic oxygen furnace (BOF) converter was developed by metallurgists. In order to understand the dephosphorisation mechanism during this process, laboratory experiments were carried out using industrial BOF crude steel and some CaO-based fluxes. It was found that the dephosphorisation behaviour of CaO in BOF crude steel differs from that of the dephosphorisation processes of hot metal. Owing to the lack of liquid phase, the efficiency of dephosphorisation using pure CaO is relatively low. The formation of 2CaO•SiO 2 phase is also crucial, but the low Si content in BOF crude steel restricts the formation of 2CaO•SiO 2 -3CaO•P 2 O 5 (C 2 S-C 3 P), thus affects the dephosphorisation efficiency. Kinetically, suitable addition of SiO 2 and FeO x can accelerate the dissolution of the flux; and thermodynamically, the addition of SiO 2 is helpful for the formation of C 2 S-C 3 P, resulting in a better dephosphorisation efficiency.

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Section: Resultsmentioning

confidence: 96%

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Deng

Yan

Zhu

et al. 2021

Ironmaking & Steelmaking

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“…The value of G CO can be calculated according to the decarburization rate as presented in Equation (5). β is a fitting parameter, whose value is determined by the experimental results.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…[3,4] The dephosphorization of hot metal can be represented by Equation (1). [5] 2½P þ 5ðFeOÞ þ 3ðCaOÞ…”

Section: Introductionmentioning

confidence: 99%

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Dephosphorization Kinetics of Hot Metal at Low Slag Basicity and Low Temperature under the Different Fe₂O₃ Addition Amounts

Zhang,

Yang,

et al. 2024

steel research int.

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In this article, the influence of the Fe2O3 addition amount on the dephosphorization kinetics of hot metal at the low slag basicity (CaO/SiO2) of about 1.6 and low temperature of 1623 K is investigated with laboratorial experiments and the kinetic model. Si and P contents in the hot metal during the whole dephosphorization process, and the endpoint FeO content in the slag, show good agreements between the calculated results with the kinetic model and experimental results. The peak value of dephosphorization rate linearly increases from 8.35 × 10−5 to 4.52 × 10−4 mass% s−1 when the weight ratio of Fe2O3 is increased from 5 to 10/100 g hot metal. With the increase in Fe2O3 addition amount, the mass transfer coefficient in the hot metal phase (km) and that in the slag phase (ks) and dephosphorization rate constant (k) all increase. The value of km is found to be 4.34 times that of ks. During the dephosphorization process, the rate‐controlling step converts from the mass transfer in slag phase to the mass transfer in hot metal phase in less than 10 min. With the increase in Fe2O3 addition amount, the value of interfacial oxygen activity of increases from 0.0102 to 0.0201.

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“…Grillo et al (2013) also state that computational thermodynamics is a tool that allows the determination of these parameters, and also the prediction of which mixture will be more efficient in industrial processes. In the last years, some researchers developed models for predicting desulfurization efficiency using these parameters in desulfurization and dephosphorization mixtures for hot metal and steel (Broseghini et al, 2018;Pezzin et al, 2020;Silva et al, 2020).…”

Section: Metalurgia E Materiaismentioning

confidence: 99%

Development of a new parameter for predicting hot metal desulfurization efficiency

et al. 2021

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Over the last decades, the capability of a desulfurizing mixture to remove sulfur has been widely studied. The hot metal desulfurization efficiency represents the percentage of sulfur removed from the bath and the development of parameters that predict the process efficiency is fundamental for selecting the best desulfurization mixture without the need for experimental tests. Therefore, this research aims to develop a new parameter to predict the hot metal desulfurization mixture efficiency, which was called the desulfurization factor (F DeS ). Desulfurizing mixtures from CaO-Fluorspar and CaO-Sodalite systems were used for this purpose. The phases present in the heating of the mixtures at 1400°C as well as the liquid and solid percentage were determined by ThelmoCalc software. These data were used in the desulfurization factor construction. Experiments were carried out in an electric resistance furnace with mechanical stirring. Different mixtures from these systems were added in molten hot metal at 1400°C. Sampling was made to measure the sulfur content variation with time. It was possible to apply the desulfurization factor to the proposed mixtures and to determine the influence of the solid and liquid phases on the desulfurization efficiency.

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Use of computational thermodynamics software to determine the influence of CaO, FeO and SiO2 on hot metal dephosphorization efficiency

Cited by 7 publications

References 7 publications

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Dephosphorization Kinetics of Hot Metal at Low Slag Basicity and Low Temperature under the Different Fe₂O₃ Addition Amounts

Development of a new parameter for predicting hot metal desulfurization efficiency

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Use of computational thermodynamics software to determine the influence of CaO, FeO and SiO2 on hot metal dephosphorization efficiency

Cited by 7 publications

References 7 publications

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Dephosphorisation behaviour of BOF crude steel using CaO-based flux

Dephosphorization Kinetics of Hot Metal at Low Slag Basicity and Low Temperature under the Different Fe2O3 Addition Amounts

Development of a new parameter for predicting hot metal desulfurization efficiency

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Product

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Dephosphorization Kinetics of Hot Metal at Low Slag Basicity and Low Temperature under the Different Fe₂O₃ Addition Amounts