Thermodynamics and Kinetics of Hot Metal Dephosphorization by CaO based Slag Containing CaF&lt;SUB&gt;2&lt;/SUB&gt;

Kawai, Yoshihiro; Nakamura, Hideo; Kawakami, Kiminari; Toyoda, Takeharu; Ishizaka, Akira; Ebisawa, Tsutomu

doi:10.2355/tetsutohagane1955.69.15_1755

Cited by 11 publications

(12 citation statements)

References 3 publications

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“…Masaki MIYATA, 1) * Teppei TAMURA 2) and Yoshihiko HIGUCHI August 2, 2017) Phosphorus in steel is detrimental element for mechanical properties and dephosphorization treatment of hot iron is necessary to produce high-grade steel products. However, it is difficult to perform dephosphorization treatment to attain lower phosphorus content using CaO-SiO 2 -FeO flux without fluorite of which use is limited owing to stringent environmental regulations.…”

Section: Development Of Hot Metal Dephosphorization With Lime Powder mentioning

confidence: 99%

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Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

2017

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Section: Development Of Hot Metal Dephosphorization With Lime Powder mentioning

confidence: 99%

“…Dephosphorization treatment using CaO-SiO 2 -FeO flux has been studied by many researchers [1][2][3][4][5] and fluorite is found an excellent slagging promotion agent. However, its use is currently limited owing to stringent environmental regulations.…”

Section: Introductionmentioning

confidence: 99%

Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

2017

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“…Most models from the literature [2,3,10,13,19,20,21,23,33,37,40,55,57,65,67,69,70] were developed for molten steel dephosphorization by CaO-based slags, while only two models by Kawai et al [26] as well as by Lee and Fruehan [74] were established for hot metal dephosphorization by CaObased slags. As thermodynamic models, the collected 16 models of k P or L P were established under the condition of the slag-metal equilibrium over various temperature ranges.…”

Section: ½4mentioning

confidence: 99%

“…Only several models among the collected 16 models of k P or L P , rather than the entire 16 models, had primarily been evaluated by Yang et al [81][82][83] based on the experimental data of L P for molten steel dephosphorization by the CaO-based slags. In this contribution, the collected 16 models of k P or L P from the literature [2,3,10,13,19,20,21,23,26,33,37,40,55,57,65,67,69,70,74] have critically been evaluated based on the measured [84] results of hot metal dephosphorization at a commercial-scale hot metal pretreatment station as well as the recently proposed dephosphorization mechanism [84] of hot metal by CaO slags. This implies that the reported [84] experimental data of hot metal dephosphorization are applied as a basis to evaluate the collected 16 models of k P or L P .…”

Section: ½4mentioning

confidence: 99%

“…Thus, most prediction models of L P in the literature [2,3,10,13,19,20,21,23,26,33,37,40,55,57,65,67,71,72,74] were expressed in various forms of equilibrium quotient or apparent equilibrium constant k P of dephosphorization reaction in Eq. [ Obviously, iron oxide content (pct Fe t O) or total iron content (pct TAEFe) in slags or oxygen content [pct O] in iron-based melts can be applied by researchers to represent the oxidization ability of slags or metallic melts in denominators of various forms of k P in Eq.…”

Section: Introductionmentioning

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Critical Evaluation of Prediction Models for Phosphorus Partition between CaO-based Slags and Iron-based Melts during Dephosphorization Processes

Yang

Chai

et al. 2016

Metall Mater Trans B

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According to the experimental results of hot metal dephosphorization by CaO-based slags at a commercial-scale hot metal pretreatment station, the collected 16 models of equilibrium quotient k P or phosphorus partition L P between CaO-based slags and iron-based melts from the literature have been evaluated. The collected 16 models for predicting equilibrium quotient k P can be transferred to predict phosphorus partition L P . The predicted results by the collected 16 models cannot be applied to be criteria for evaluating k P or L P due to various forms or definitions of k P or L P . Thus, the measured phosphorus content [pct P] in a hot metal bath at the end point of the dephosphorization pretreatment process is applied to be the fixed criteria for evaluating the collected 16 models. The collected 16 models can be described in the form of linear functions as y ¼ c 0 þ c 1 x, in which independent variable x represents the chemical composition of slags, intercept c 0 including the constant term depicts the temperature effect and other unmentioned or acquiescent thermodynamic factors, and slope c 1 is regressed by the experimental results of k P or L P . Thus, a general approach to developing the thermodynamic model for predicting equilibrium quotient k P or phosphorus partition L P or [pct P] in iron-based melts during the dephosphorization process is proposed by revising the constant term in intercept c 0 for the summarized 15 models except for Suito's model (M3). The better models with an ideal revising possibility or flexibility among the collected 16 models have been selected and recommended. Compared with the predicted result by the revised 15 models and Suito's model (M3), the developed IMCT-L P model coupled with the proposed dephosphorization mechanism by the present authors can be applied to accurately predict phosphorus partition L P with the lowest mean deviation d L P of log L P as 2.33, as well as to predict [pct P] in a hot metal bath with the smallest mean deviation d ½%P of [pct P] as 12.31.

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Activities of Fe_xO in complex slags used during the final stages of external dephosphorization of hot metal

Iwase

Yamada

Akizuki

et al. 1984

Archiv für das Eisenhüttenwesen

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Measurements of the activities of FexO in complex slags during the final stages of external dephosphorization by using a disposable electrochemical oxygen probe. Positive deviations of the FexO activities from the Raoult law. Iso‐activity curves drawn on the “ternary” diagram, (CaO + MgO + MnO + CaF2) + FexO + (SiO2 + P2O5) at 1673 K. Calculations of the activities of P2O5 in complex slags with an assumption of thermodynamic equilibrium between slags and hot metal. Beneficial effect of CaF2 in the slags with respect to lowering of the P2O5 activity.

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Thermodynamics and Kinetics of Hot Metal Dephosphorization by CaO based Slag Containing CaF<SUB>2</SUB>

Cited by 11 publications

References 3 publications

Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

Critical Evaluation of Prediction Models for Phosphorus Partition between CaO-based Slags and Iron-based Melts during Dephosphorization Processes

Activities of Fe_xO in complex slags used during the final stages of external dephosphorization of hot metal

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Thermodynamics and Kinetics of Hot Metal Dephosphorization by CaO based Slag Containing CaF<SUB>2</SUB>

Cited by 11 publications

References 3 publications

Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

Development of Hot Metal Dephosphorization with Lime Powder Top Blowing: Part 2. High Blowing Rate

Critical Evaluation of Prediction Models for Phosphorus Partition between CaO-based Slags and Iron-based Melts during Dephosphorization Processes

Activities of FexO in complex slags used during the final stages of external dephosphorization of hot metal

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Activities of Fe_xO in complex slags used during the final stages of external dephosphorization of hot metal