Thermodynamic considerations on manganese equilibria between liquid iron and FetO-MnO-MOx (MOx=PO2.5, SiO2, AlO1.5, MgO, CaO) slags.

Suito, Hideaki; Inoue, Ryo

doi:10.2355/isijinternational1966.24.301

Cited by 46 publications

(32 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mn ϩ (FeO) ϭ (MnO) ϩ Fe (l ) [1] [10] ⌬GЊ ϭ Ϫ31,730 ϩ 14.18T (cal/mole) 1 The equilibrium constant for this reaction can be written as Using the available thermodynamic data for the ⌬GЊ 1 , it is possible to write the value of K 1 as a function of the Chipman et al [2] FeO-MnO (CaO ϩ SiO 2 ϩ MgO) Ͻ 6 pct log k Mn ϭ Ϫ3.09 6760 T Fisher and Fleisher [3] FeO-MnO log k ' Mn ϭ Ϫ3.375 7110 T Caryll and Ward [4] log k ' Mn ϭ Ϫ2.76 6086 T…”

Section: A Manganese Equilibriummentioning

confidence: 99%

Thermodynamics of MnO, FeO, and phosphorus in steelmaking slags with high MnO contents

Morales

Fruehan

1997

Metall Mater Trans B

View full text Add to dashboard Cite

The thermodynamics of manganese oxide and iron oxide and the phosphate capacity of CaO-SiO 2 -MnO-Fe t O-P 2 O 5 -MgO sat slags with high MnO contents relevant to the smelting of MnO ores in steelmaking were investigated. Previous data were limited to about 5 pct MnO, whereas in this study MnO contents up to 25 pct were studied. The activity of MnO showed positive deviation from ideal behavior and increased with basicity, while that of Fe t O decreased with basicity. This is reflected in that the manganese distribution ratio at a given Fe t O content decreases with basicity and high Mn in the metal is favored by high basicity. CaF 2 additions up to 4 pct did not affect the activities of MnO and Fe t O. The activity coefficient of P 2 O 5 decreases and the phosphate capacity increases with basicity. There was not adverse effect of high MnO contents on the dephosphorizing abilities of the slags.

show abstract

Section: A Manganese Equilibriummentioning

confidence: 99%

Thermodynamics of MnO, FeO, and phosphorus in steelmaking slags with high MnO contents

Morales

Fruehan

1997

Metall Mater Trans B

View full text Add to dashboard Cite

show abstract

“…The oxygen potential of slags is usually described by activity a Fe t O of iron oxides Fe t O relative to pure matter as a standard state, while the oxygen potential of iron-based melts is usually repre- In terms of the proposed [5,22] dephosphorization mechanism in Section II, a dynamic metal film beneath the slag-metal interface with high oxygen potential and low carbon content like molten steel can be formed based on the (Fe t O)-[O] equilibrium during the hot metal dephosphorization process. Thus, two methods should be applied to determine activity a P 2 O 5 of P 2 O 5 in the CaO-based slags: one is based on the slag-metal [33][34][35] t Fe …”

Section: Cao Sio 2 Mgo Feo Fementioning

confidence: 99%

Critical Assessment of P2O5 Activity Coefficients in CaO-based Slags during Dephosphorization Process of Iron-based Melts

Yang

Chai

et al. 2016

Metall Mater Trans B

View full text Add to dashboard Cite

According to the experimental results of hot metal dephosphorization by CaO-based slags at a commercial-scale hot metal pretreatment station, activity a P 2 O 5 of P 2 O 5 in the CaO-based slags has been determined using the calculated comprehensive mass action concentration N Fe t O of iron oxides by the ion and molecule coexistence theory (IMCT) for representing the reaction ability of Fe t O, i.e., activity of a Fe t O . The collected ten models from the literature for predicting activity coefficient c P 2 O 5 of P 2 O 5 in CaO-based slags have been evaluated based on the determined activity a P 2 O 5 of P 2 O 5 by the IMCT as the criterion. The collected ten models of activity coefficient c P 2 O 5 of P 2 O 5 in CaO-based slags can be described in the form of a linear function as log c P 2 O 5 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 temperature effect and other unmentioned or acquiescent thermodynamic factors, and slope c 1 is regressed by the experimental results. Thus, a general approach for obtaining good prediction results of activity a P 2 O 5 of P 2 O 5 in CaO-based slags is proposed by revising the constant term in intercept c 0 for the collected ten models. The better models with an ideal revising possibility or flexibility in the collected ten models have been selected and recommended.

show abstract

“…[12], ésta da lugar a la formación de MnO. Cantidades elevadas de MnO producen un desplazamiento de la reacción de eliminación del manganeso hacia la izquierda; es decir, hacia la formación del manganeso en el acero [10], incrementando la concentración final de manganeso; por otra parte, concentraciones elevadas de azufre necesitan incrementar la concentración inicial de cal para su eliminación, situación que perjudica la concentración final de manganeso. Elevadas temperaturas iniciales del arrabio perjudican la eliminación del manganeso.…”

Section: Influencia Del Arrabiounclassified

“…(FeO) + Mn <^ (MnO) + Fe [10] La eliminación del manganeso se caracteriza porque al principio su tendencia a la escorificación es elevada (8), ya que la masa de la escoria y su contenido de FeO aumenta rápidamente. Hacia la mitad del afino, el FeO disminuye en la escoria y la temperatura se estabiliza, dando lugar a una reversión del manganeso a la fase metal.…”

Section: Influencia Del Patrón De Sopladounclassified

Procesos de conversión de acero y efecto de variables en convertidores tipo L.B.E.

Blanco¹,

Vega²,

Dı́az³

1995

REVMETAL

View full text Add to dashboard Cite

Se analiza la eficacia de los procesos de transformación en convertidores en condiciones de trabajo determinadas, para deducir relaciones aplicables al control basadas en la modificación de cantidades y composiciones de las materias primas. Se plantean ecuaciones empíricas para determinar la composición final del acero como función de los aditivos y de las concentraciones iniciales del arrabio tratado, así como el patrón de soplado de oxígeno. Las relaciones obtenidas establecen las dependencias entre cada una de las variables consideradas y, por tanto, permiten determinar estrategias de operación para obtener aceros con unas calidades finales dadas.Palabras clave: Acero. Convertidor. Modelo estadístico. Control. Resumen Steel conversión processes and effect of the variables in L.B.E. converters AbstractIn order to determine control equations based on qualitative and quantitative changes of the raw materials, an analysis of the efficiency of the steel production process was carried out in converters under specified operation conditions. Empirical equations to obtain the final composition of the steel as a function of the additives, the initial concentrations of the hot metal and the blowing oxygen pattems are established. The resulting relationships depend on the considered variables and therefore could be used to determine operational strategies in order to obtain steels of a certain quality.

show abstract

Thermodynamic considerations on manganese equilibria between liquid iron and FetO-MnO-MOx (MOx=PO2.5, SiO2, AlO1.5, MgO, CaO) slags.

Cited by 46 publications

References 9 publications

Thermodynamics of MnO, FeO, and phosphorus in steelmaking slags with high MnO contents

Thermodynamics of MnO, FeO, and phosphorus in steelmaking slags with high MnO contents

Critical Assessment of P2O5 Activity Coefficients in CaO-based Slags during Dephosphorization Process of Iron-based Melts

Procesos de conversión de acero y efecto de variables en convertidores tipo L.B.E.

Contact Info

Product

Resources

About