Phosphate capacity of FeO-Fe2O3-CaO-P2O5 and FeO-Fe2O3-CaO-CaF2-P2O5 slags by levitation melting.

Shirota, Yoshiyasu; Katohgi, Ken; Klein, Karl; Engell, Hans‐Jürgen; Janke, Dieter

doi:10.2355/isijinternational1966.25.1132

Cited by 13 publications

(4 citation statements)

References 3 publications

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“…4,5,[10][11][12][13][97][98][99][100] It is generally accepted that it is controlled by a combination of both the metal and slag phases in highly stirred conditions. This oxygen potential can be represented as a balance between reactions (or equivalent slag metal reactions with oxygen in the gas phase) in Equations ( 56) and (57).…”

Section: Discussion Evaluation Of Published Phosphorus Partition Rela...mentioning

confidence: 99%

A review of phosphorus partition relations for use in basic oxygen steelmaking

Drain

Monaghan

Zhang

et al. 2017

Ironmaking & Steelmaking

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Phosphorus removal in basic oxygen steelmaking is a significant problem for integrated steelmakers. Phosphorus removal is required due to its deleterious effect on the mechanical properties of steel. However, this is progressively becoming more difficult due to the increasing phosphorus content of many iron ores. Many studies have investigated dephosphorisation and published empirical phosphorus partition (L P ) equations for a range of conditions. The structure of these equations has been used to develop a new partition relation that allows the effect of minor slag constituents such as TiO 2 , Al 2 O 3 and V 2 O 5 on steel dephosphorisation to be tested. Al 2 O 3 was found to have a weak negative effect on the measured L P , except at the lower oxygen potential range tested, where a positive correlation was observed. Increasing TiO 2 and V 2 O 5 contents were found to decrease the measured L P ; however, these correlations became less prevalent at the higher oxygen potential ranges tested. AbstractPhosphorus removal in basic oxygen steelmaking (BOS) is a significant problem for integrated steelmakers. Phosphorus removal is required due to its deleterious effect on the mechanical properties of steel. However, this is progressively becoming more difficult due to the increasing phosphorus content of many iron ores.Many studies have investigated dephosphorisation and published empirical phosphorus partition (L P ) equations for a range of conditions. The structure of these equations have been used to develop a new partition relation that allows the effect of minor slag constituents such as TiO 2 , Al 2 O 3 and V 2 O 5 on steel dephosphorisation to be tested. Al 2 O 3 was found to have a weak negative effect on the measured L P , except at the lower oxygen potential range tested, where a positive correlation was observed. Increasing TiO 2 and V 2 O 5 contents were found to decrease the measured L P , however these correlations became less prevalent at the higher oxygen potential ranges tested. Definitions and Nomenclature( ) = in slag solution [ ] = in liquid iron solution %i = mass % of i (%Fe t ) = mass% of total Fe in slag phase (%Fe t O) = mass% of total Fe in slag phase as FeO M i = molecular weight of oxide i R = universal gas constant, 8.314 JK -1 mol -1 N = mole fraction of oxide or ion = L P calculated by model � = L P calculated by linear regression line through results to the origin = optical basicity of slag Λ i = optical basicity of single oxide of species i T = Temperature in K 4

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Section: Discussion Evaluation Of Published Phosphorus Partition Rela...mentioning

confidence: 99%

A review of phosphorus partition relations for use in basic oxygen steelmaking

Drain

Monaghan

Zhang

et al. 2017

Ironmaking & Steelmaking

View full text Add to dashboard Cite

show abstract

“…Phase diagrams and thermodynamic properties data available for unary, binary and ternary P 2 O 5 -containing systems were critically evaluated and optimized to build up a reliable thermodynamic database. In order to describe the thermodynamic behavior of P 2 O 5 in slag, the Modified Quasichemical Model taking into [16,45,47,[51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70] and calculated L P values for binary, ternary and multicomponent slags using the present thermodynamic database. Brought to you by | University of Queensland -UQ Library Authenticated Download Date | 6/17/15 5:11 PM account the short-range-ordering of cations in molten slag is used explicitly in the present study.…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic Database of P2O5-containing Oxide Systems for the Dephosphorization Process in Steelmaking

Jung

Hudon

Kim

et al. 2013

High Temperature Materials and Processes

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The Na 2 O-MgO-CaO-FeO-Fe 2 O 3 -Al 2 O 3 -SiO 2 -P 2 O 5 system is a basic oxide system for the Basic Oxygen Furnace (BOF) process as well as the hot metal dephosphorization process. Numerous experimental investigations on this oxide system are being carried out to find out an advanced process route for P removal from molten iron. In spite of their industrial importance, however, phase equilibria in oxide systems containing P 2 O 5 have not been well investigated due to the complexity of their chemistry. No systematic thermodynamic modeling of these systems has been conducted to date, either. In order to meet the strong demands of steelmaking and other industries, new systematic thermodynamic modeling of the P 2 O 5 -containing oxide systems (Na 2 O-MgO-CaO-FeO-Fe 2 O 3 -Al 2 O 3 -SiO 2 -P 2 O 5 ) and key phase diagram experiments have been carried out over the past years. In the present study, the results of the thermodynamic modeling of unary, binary and ternary P 2 O 5 -containing systems and the applications of the thermodynamic database to the dephosphorization by multi-component slag in BOF process are presented in comparison with experimental data. All thermodynamic calculations were performed using FactSage thermodynamic software.

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“…However, the applied calculation method of the mole fraction x PO 3À 4 of PO 3À 4 by some researchers [35,48,50] based on ionic theory of slags by Flood, F/rland, and Grjotheim [95,96] is questionable because the denominator of mole fraction x PO 3À 4 of PO 3À 4 should be the sum of all cationic and anionic ions, rather than only the sum of anionic ions.…”

Section: Theoretical Relationship Among Various Expressions Of Phomentioning

confidence: 99%

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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Phosphate capacity of FeO-Fe2O3-CaO-P2O5 and FeO-Fe2O3-CaO-CaF2-P2O5 slags by levitation melting.

Cited by 13 publications

References 3 publications

A review of phosphorus partition relations for use in basic oxygen steelmaking

A review of phosphorus partition relations for use in basic oxygen steelmaking

Thermodynamic Database of P2O5-containing Oxide Systems for the Dephosphorization Process in Steelmaking

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

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