Distribution Ratios of Phosphorus Between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 Slags and Carbon-Saturated Iron

Li, Fengshan; Li, Xianpeng; Yang, Shufeng; Zhang, Yanling

doi:10.1007/s11663-017-1023-8

Cited by 26 publications

(24 citation statements)

References 20 publications

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“…Al2O3 consumed the free O 2− to form 5 4 [AlO] − -tetrahedron, which decreased free O 2− concentration and weakened the However, this trend did not hold for the data shown in Figure 4b, which suggests that the temperature has no significant effect on logL S when the slag compositions vary significantly. Despite the different requirements of temperature, a similar tendency was observed in the research [16] on the phosphorus distribution ratio between the CaO-FeO-SiO 2 -Al 2 O 3 -Na 2 O-TiO 2 slag and the carbon-saturated iron, which suggests that the phosphorus distribution ratio showed much greater dependency on the slag composition, such as on basicity rather than on temperature. Together, these results indicate that, for hot metal pretreatment, slag compositions tend to have significant effects on the desulfurization/dephosphorization efficiency.…”

Section: Effect Of Basicitysupporting

confidence: 72%

“…A comparison between However, a different tendency was observed in the case of hot metal dephosphorization. The results of hot metal dephosphorization by Li [16] showed that, when changing various factors, such as temperature and slag compositions, the distribution ratio of phosphorus between the slag and iron-saturated iron (L P ) increased significantly with the increase of Na 2 O content. This was mainly because hot metal dephosphorization was carried out in an oxidizing atmosphere, and Na 2 O in the slag was hard to be reduced to metal Na.…”

Section: Regression Analysis Of Loglsmentioning

confidence: 99%

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Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Zhang

2018

Metals

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To explore the feasibility of hot metal desulfurization using red mud, the sulfur distribution ratio (LS) between CaO-SiO2-Al2O3-Na2O-TiO2 slag and carbon-saturated iron is evaluated in this paper. First, the theoretical liquid areas of the CaO-SiO2-Al2O3 (-Na2O-TiO2) slag are discussed and the fluxing effects of Al2O3, Na2O, and TiO2 are confirmed. Then, LS is measured via slag-metal equilibrium experiments. The experimental results show that LS significantly increases with the increase of temperature, basicity, and Na2O content, whereas it decreases with the increase of Al2O3 and TiO2 content. Na2O in the slag will volatilize with high temperatures and reducing conditions. Furthermore, based on experimental data for the sulfur distribution ratio between CaO-SiO2-Al2O3-Na2O-TiO2 slag and the carbon-saturated iron, the following fitting formula is obtained: log L S = 45.584 Λ + 10568.406 − 17184.041 Λ T − 8.529

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Section: Effect Of Basicitysupporting

confidence: 72%

Section: Regression Analysis Of Loglsmentioning

confidence: 99%

Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Zhang

2018

Metals

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“…considered the same temperature but different FeO content (15 -25%), Basu's and FactSage's results have similar Lp values. Urban[22] and Li[24] also found a similar trend, despite their Lp's values that were lower…”

mentioning

confidence: 53%

Evaluation of Phosphorus Partition in Steels Using Computational Thermodynamic and Comparison With Literature Data

Almeida¹,

Bielefeldt²,

Vilela³

2018

ABM Proceedings

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Phosphorus content control at steel plants is frequently a challenge. This element, in general, is undesirable for steel, due to its deleterious effect in steel properties. Phosphorus partition (Lp=%P (slag) /%P (steel)) is widely used to analyze the dephosphorization efficiency. The thermodynamic program FactSage is largely used in the analysis of steelmaking slags. This study aims not only to evaluate the accuracy of the program FactSage v. 7.2, but also the contribution of the thermodynamics in the dephosphorization phenomena. A study about how the phosphorus partition behaves in the program calculations was done. This study is divided in two parts: the first part is an analysis of the effects that the different slag oxides, basicity, FeO and Al 2 O 3 , have in the Lp; the second part is a comparison between the literature values of phosphorus distribution and the results found by the program calculation. As the program considers that the system is in thermodynamic equilibrium, all the literature chosen was considered in equilibrium by its authors. For the first part it was found that the results behaved as expected by the literature, in the second part, the comparison resulted in average/good determination coefficient, R 2 above 0.6, for literature data.

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“…However, CaO-based slags have a high melting point, and lower temperatures thermodynamically aid in the dephosphorization reaction. Therefore, CaF 2 and other fluxes are usually added to the molten slag to decrease its melting point and to enhance the kinetics of the dephosphorization process [3,4]. The melting properties of CaO-Fe 2 O 3 -Na 2 O-Al 2 O 3 -CaF 2 dephosphorization slag were measured using the hemisphere method.…”

Section: Introductionmentioning

confidence: 99%

Dephosphorization of hot metal using rare earth oxide-containing slags

Yang

et al. 2020

High Temperature Materials and Processes

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An innovative rare earth oxide-containing slag for hot metal dephosphorization was proposed, and the factors influencing the efficiency during the dephosphorization of hot metal using rare earth oxide-containing slags were also studied. An increase in the temperature up to 1,550°C is beneficial to the dephosphorization process, and the maximum degree of dephosphorization for slags containing 6 wt% rare earth oxides is 44.49%; further temperature increases would deteriorate the efficiency, and the degree of dephosphorization decreases to 37.38% at 1,600°C. An increase in the basicity of slags up to 3.0, and the rare earth oxide content up to 6 wt%, improves the dephosphorization efficiency; further increase in the basicity and rare earth oxide content, the efficiency has almost no change. It was also found that an increase in the quantity of slags is beneficial to the dephosphorization reaction.

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Distribution Ratios of Phosphorus Between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 Slags and Carbon-Saturated Iron

Cited by 26 publications

References 20 publications

Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Distribution Ratio of Sulfur between CaO-SiO2-Al2O3-Na2O-TiO2 Slag and Carbon-Saturated Iron

Evaluation of Phosphorus Partition in Steels Using Computational Thermodynamic and Comparison With Literature Data

Dephosphorization of hot metal using rare earth oxide-containing slags

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