Change in Phosphorus Partition during Blowing in a Commercial BOF

Basu, Somnath; Lahiri, A.; Seetharaman, Seshadri; Halder, J

doi:10.2355/isijinternational.47.766

Cited by 33 publications

(32 citation statements)

References 6 publications

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“…[30] Accordingly, the FeO concentration and the basicity (CaO/SiO 2 , mass pct ratio) were varied within the ranges of 10 to 30 mass pct, and 1.2 to 3.5, respectively. Table II shows the chemical composition and the activities of FeO (a FeO ) and oxygen (h O ) for the samples equilibrated at 1873 K. The concentrations of CaO, SiO 2 , FeO, P 2 O 5 , and MgO are considered in mass percent, and the oxygen concentration in steel is expressed in parts per million (by mass).…”

Section: Resultsmentioning

confidence: 99%

Activity of Iron Oxide in Steelmaking Slag

Basu

Lahiri

Seetharaman

2008

Metall Mater Trans B

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Most refining reactions in steelmaking involve oxidation of impurity element(s). The product(s) of oxidation either dissolve in the slag or escape as gaseous phase. The activities of oxygen in the metal (h O ), and that of ''FeO'' in slag (a FeO ), are major factors controlling these chemical reactions. The activities of oxygen and ''FeO'' are thermodynamically related, provided equilibrium distribution of oxygen between the slag and the metal is attained. This enables direct estimation of one parameter from the other. A thorough knowledge of the variation in activity of FeO, and factors affecting the same, is therefore of great importance in the process metallurgy of steelmaking. The present work experimentally measures the activity of FeO in steelmaking slags and attempts to develop a correlation for estimation of c(FeO) as a function of temperature and chemical composition of the slag.

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Section: Resultsmentioning

confidence: 99%

Activity of Iron Oxide in Steelmaking Slag

Basu

Lahiri

Seetharaman

2008

Metall Mater Trans B

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“…[5a] through [5g] and [6] is composed of the applied thermodynamic model for calculating the mass action concentrations N i of structural units or ion couples in CaO-SiO 2 -MgO-FeO-Fe 2 O 3 -MnO-Al 2 O 3 -P 2 O 5 slags equilibrated or reacted with molten steel during calculation. The calculated P n i in 100-g slags during a top-bottom combined blown converter steelmaking process for 27 heats is also summarized in Table I, respectively.…”

Section: Industrial Testsmentioning

confidence: 99%

“…As an important function of converter steelmaking process, the oxidizing dephosphorization of hot metal or molten steel, has been investigated by many researchers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] since the 1940s, [1,2,9] and many phosphorous distribution ratio prediction models [9][10][11][12][13][14][15][16] have been developed based on some empirical regressions of the measured data, such as Healy's model, [10] Suito's three models, [11,12] Sommerville's model, [9,13] and Balajiva's model. [14] However, the phosphorous distribution ratio models [9][10][11][12][13][14][15][16] are not enough and scarce from the view point of dephosphorization reactions based on metallurgical physicochemistry.…”

Section: Introductionmentioning

confidence: 99%

A Thermodynamic Model of Phosphorus Distribution Ratio between CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags and Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

Yang

Duan

Shi

et al. 2011

Metall Mater Trans B

123

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A thermodynamic model for calculating the phosphorus distribution ratio between top-bottom combined blown converter steelmaking slags and molten steel has been developed by coupling with a developed thermodynamic model for calculating mass action concentrations of structural units in the slags, i.e., CaO-SiO 2 -MgO-FeO-Fe 2 O 3 -MnO-Al 2 O 3 -P 2 O 5 slags, based on the ion and molecule coexistence theory (IMCT). Not only the total phosphorus distribution ratio but also the respective phosphorus distribution ratio among four basic oxides as components, i.e., CaO, MgO, FeO, and MnO, in the slags and molten steel can be predicted theoretically by the developed IMCT phosphorus distribution ratio prediction model after knowing the oxygen activity of molten steel at the slag-metal interface or the Fe t O activity in the slags and the related mass action concentrations of structural units or ion couples in the slags. The calculated mass action concentrations of structural units or ion couples in the slags equilibrated or reacted with molten steel show that the calculated equilibrium mole numbers or mass action concentrations of structural units or ion couples, rather than the mass percentage of components, can present the reaction ability of the components in the slags. The predicted total phosphorus distribution ratio by the developed IMCT model shows a reliable agreement with the measured phosphorus distribution ratio by using the calculated mass action concentrations of iron oxides as presentation of slag oxidation ability. Meanwhile, the developed thermodynamic model for calculating the phosphorus distribution ratio can determine quantitatively the respective dephosphorization contribution ratio of Fe t O, CaO + Fe t O, MgO + Fe t O, and MnO + Fe t O in the slags. A significant difference of dephosphorization ability among Fe t O, CaO + Fe t O, MgO + Fe t O, and MnO + Fe t O has been found as approximately 0.0 pct, 99.996 pct, 0.0 pct, and 0.0 pct during a combined blown converter steelmaking process, respectively. There is a great gradient of oxygen activity of molten steel at the slag-metal interface and in a metal bath when carbon content in a metal bath is larger than 0.036 pct. The phosphorus in molten steel beneath the slag-metal interface can be extracted effectively by the comprehensive effect of CaO and Fe t O in slags to form 3CaOAEP 2 O 5 and 4CaOAEP 2 O 5 until the carbon content is less than 0.036 pct during a top-bottom combined blown steelmaking process.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Many studies have been carried out to measure phosphorous distribution between various slags and hot metal since the 1940 s. 1,2,9) However, the measurement of phosphorous distribution between molten slag and hot metal is costly and difficult 11,12) in the operation. It is therefore very necessary to develop a reliable model for predicting phosphorous distribution between molten slag and hot metal.…”

Section: Introductionmentioning

confidence: 99%

Retraction: Representation of Dephosphorization Ability for CaO–Containing Slags Based on the Ion and Molecule Coexistence Theory

Li¹,

Zhang²

2014

ISIJ Int.

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A thermodynamic model for calculating phosphorous distribution between several slag systems and hot metal has been developed by coupling with a developed thermodynamic model for calculating mass action concentrations of iron oxides based on the ion and molecule coexistence theory (IMCT). The calculated mass action concentrations of iron oxides in the several CaO-containing slags can be applied to represent reaction ability of iron oxides, like classic concept of activity. The developed thermodynamic model for calculating phosphorus distribution can quantitatively calculate the respective contribution of free components, and the sum of the respective contribution of free components. The comparison of the calculated total phosphorous distribution with all available measured phosphorous distribution reported in literatures shows that the agreement between the calculated total phosphorous distribution and measured phosphorous distribution is good. This reliable agreement indicates that the IMCT-LP model can be successfully applied to predict the phosphorous distribution for CaO-FeO-Fe2O3-P2O5 slags, CaO-SiO2-FeOFe2O3-P2O5 slags, CaO-SiO2-FeO-Fe2O3-Al2O3-P2O5 slags, CaO-SiO2-FeO-MgO-P2O5 slags, CaO-SiO2-FeO-Fe2O3-MgO-P2O5 slags and CaO-SiO2-MgO-FeO-Fe2O3-MnO-P2O5 slags in a temperature range from 1 823 K to 1 973 K.

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Change in Phosphorus Partition during Blowing in a Commercial BOF

Cited by 33 publications

References 6 publications

Activity of Iron Oxide in Steelmaking Slag

Activity of Iron Oxide in Steelmaking Slag

A Thermodynamic Model of Phosphorus Distribution Ratio between CaO-SiO2-MgO-FeO-Fe2O3-MnO-Al2O3-P2O5 Slags and Molten Steel during a Top–Bottom Combined Blown Converter Steelmaking Process Based on the Ion and Molecule Coexistence Theory

Retraction: Representation of Dephosphorization Ability for CaO–Containing Slags Based on the Ion and Molecule Coexistence Theory

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