Manganese equilibrium between molten iron and MgO-saturated CaO-FetO-SiO2-MnO slags.

Suito, Hideaki; Inoue, Ryo

doi:10.2355/isijinternational1966.24.257

Cited by 45 publications

(75 citation statements)

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“…the molar fractions of cations multiplied by the number of oxygens in the respective component. The present work plotted together with the results obtained by Shim and Ban-ya 8) and Suito and Inoue 9) show similar tendency as shown in Fig. 7 although the steelmaking slag-related data have slightly lower MgO solubility.…”

Section: Correlation Of Mgo Solubility With Optical Basicitysupporting

confidence: 68%

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Solubility of MgO in New Ironmaking Process-typed Slags

Jung¹,

Min²,

Rhee³

2007

ISIJ Int.

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The solubilities of MgO obtained from the data obtained from equilibrium experiments between liquid CaO-SiO 2 -Al 2 O 3 -Fe t O-MnO slags and liquid silver and solid iron in the temperature range of 1 703 to 1 773 K in a CO/CO 2 gas mixture are analyzed in the current study. The solubilities of MgO decreased with increasing Fe t O content and the slag basicity, (mass% CaO)/(mass% SiO 2 ) in the slag basicity less than 2.0 and they were compared with the change of the MgO solubility with increasing MnO concentration in the slags. The present data were temperature-extrapolated to those at 1 873 K and compared with the previously reported MgO solubilities in steelmaking slags. The application of the optical basicity resulted in correlation of MgO solubility with COREX process-typed slag compositions.

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Section: Correlation Of Mgo Solubility With Optical Basicitysupporting

confidence: 68%

“…In Fig. 3 8,9) measured at 1 873 K, which can be easily explained considering that the general dissolution of solid phase into liquid slag is endothermic.…”

Section: Effect Of Slag Compositions On Mgo Solubilitymentioning

confidence: 99%

Solubility of MgO in New Ironmaking Process-typed Slags

Jung¹,

Min²,

Rhee³

2007

ISIJ Int.

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“…1-9.6) in open-hearth slags and indicated that MnO is a more basic constituent than FeO. Suito and Inoue 5) measured the manganese distribution between liquid iron and MgO-saturated CaO-SiO 2 -Fe t O-MnO slags (MnOϽ5.3 mass%) containing P 2 O 5 or S in the temperature range of 1 823-1 923 K. According to their results, the manganese distribution ratio was found to increase with an increase in SiO 2 content and decrease in temperature. Recently Morales and Fruehan 6) investigated the thermodynamics of manganese oxide and iron oxide of CaO-SiO 2 -Fe t O-MgO sat -MnO-P 2 O 5 slags with high MnO contents (MnOϽ25 mass%) relevant to the smelting of MnO ores in steelmaking.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties of Manganese Oxide in BOF Slags.

2002

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It is necessary to understand the thermodynamic properties of MnO in steelmaking slags for the smelting reduction of Mn ore in BOF process. Studies of the manganese distribution between CaO-SiO 2 -Fe t O-MnO slags and liquid silver in equilibrium with solid Fe in the temperature range of 1 623 to 1 723 K were carried out under a CO/CO 2 atmosphere.The Fe t O content in (32.4ϳ36.3)%CaO-(31.6ϳ44.0)%SiO 2 -(9.9ϳ24.1)%FeO-(0.4ϳ2.6)%Fe 2 O 3 -(8.9ϳ 10.8)%MnO slags was found to have a linear relationship with oxygen partial pressure. The values of Fe 3ϩ /Fe 2ϩ in the same slag system increase by increasing the Fe t O content. The Mn distribution ratio between slag and metal, (%MnO)/[%Mn] Fe-C sat , increases with FeO content in a linear relationship over the measured FeO concentration range (6.7-24.1 mass%). The Mn distribution ratio decreases with increasing CaF 2 , which is believed to have the effect of increasing the activities of MnO and FeO.Temperature dependence of equilibrium manganese distribution at p O 2 ϭ6.6ϫ10 Ϫ12 atm in the temperature range of 1 623 to 1 723 K can be expressed as follows:The relative partial heat of solution of MnO into (32.7ϳ39.1)%CaO-(32.7ϳ38.8)%SiO 2 -(10.2ϳ20.78)%FeO-(1.0ϳ2.4)%Fe 2 O 3 -(9.4ϳ10.8)%-MnO slags was estimated to be 198 kJ/mol.

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“…6. The results of Suito et al 38) and Morales et al 18) for ferromanganese slags are also plotted. There is considerable scatter in those data.…”

Section: Manganese Equilibriummentioning

confidence: 99%

“…However, g MnO increases as B the increases. According to modern slag theory, the reason is attributed to the preferential association of [38][39][40] suggest that the increase continues until a maximum B-value is reached, after which the value of g MnO remains constant. In order to prevent the oxidation loss of Mn from steel, a MnO must be maximized without increasing X MnO .…”

Section: Manganese Equilibriummentioning

confidence: 99%

Manganese and Chromium Distribution between CaO–SiO2–MgOsat.–CrO1.5–MnO Slags and Fe–Cr–Mn Stainless Steel

et al. 2008

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The Mn and Cr equilibria between a Mn rich stainless steelmaking slag (CaO-SiO 2 -MgO sat. -MnO-CrO 1.5 ) and Fe-Cr-Mn stainless steel were investigated in a temperature range from 1 823 to 1 873 K under Ar atmosphere. The partition ratios L Mn and L Cr between liquid slag and steel were determined as a function of slag composition and temperature. By combining the experimental results with thermodynamic calculations, it was found that, as basicity increases, L Mn decreases, while L Cr increases. The elevated basicity leads to a high MnO activity coefficient. On the other hand, the CrO 1.5 activity coefficient decreases with higher slag basicities. The influence of MnO and CrO 1.5 contents on the activity coefficients was also considered. It is concluded that in order to maximize Mn recovery during high Mn stainless steel production, a basic slag with a high MnO activity coefficient must be employed whereas high temperatures should be avoided.

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Manganese equilibrium between molten iron and MgO-saturated CaO-FetO-SiO2-MnO slags.

Cited by 45 publications

References 0 publications

Solubility of MgO in New Ironmaking Process-typed Slags

Solubility of MgO in New Ironmaking Process-typed Slags

Thermodynamic Properties of Manganese Oxide in BOF Slags.

Manganese and Chromium Distribution between CaO–SiO2–MgOsat.–CrO1.5–MnO Slags and Fe–Cr–Mn Stainless Steel

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