Activity determinator for the automatic measurements of the chemical potentials of FeO in metallurgical slags

Ogura, Tsugio; Fujiwara, Ryuji; Mochizuki, R.; Kawamoto, Yasutoshi; Oishi, Takao; Iwase, M.

doi:10.1007/bf02649665

Cited by 37 publications

(34 citation statements)

References 6 publications

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“…17) It is well known the oxygen sensors containing zirconia based solid electrolyte are utilized extensively throughout the steelmaking process [18][19][20][21][22] and several investigators have also explored the use of zirconia probes to measure the activity of FeO x within the slag phase. [23][24][25][26][27][28] In these applications, the cells are operated in an equilibrium mode and the open circuit voltage (OCV) is measured. In other applications, a dynamic mode of operation is employed and the close circuit current or voltage is measured as a function of time.…”

Section: Effect Of Applied Voltage On Electroreduction With Controllementioning

confidence: 99%

Effect of Applied Voltage on Electroreduction with Controlled Oxygen Flow of Molten Slag Containing FeO at 1723 K

et al. 2015

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Section: Effect Of Applied Voltage On Electroreduction With Controllementioning

confidence: 99%

Effect of Applied Voltage on Electroreduction with Controlled Oxygen Flow of Molten Slag Containing FeO at 1723 K

et al. 2015

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“…In this study, the mass action concentration of iron oxides Fe t O, i.e., N Fe t O , is recommended to present slag oxidization ability. The IMCT [21][22][23][24][25][26][27][28] proposed that all iron oxides in metallurgical slags are composed of ion couple (Fe In order to examine the reliability of the IMCT-Ni model developed in the present study based on the ion and molecule coexistence theory, the calculated mass action concentrations of iron oxides N Fe t O in CaO-FeO-Fe 2 O 3 slags, 32,59,60) CaO-SiO 2 -FeO-Fe 2 O 3 slags, 33,38,[61][62][63][64][65][66] CaO-SiO 2 -FeOFe2O3-Al2O3 slags, 34) CaO-SiO2-FeO-Fe2O3-MgO slags, 35,67) CaO-SiO2-MgO-FeO-Fe2O3-MnO slags, 36) CaO-SiO2-MgO-FeO-P2O5 slags, 37) MgO-FeO-Fe2O3-P2O5 slags, 38) CaO-FeO-Fe2O3-P2O5 slags 39) and CaO-SiO2-MgO-FeO-Fe 2 O 3 -MnO-Al 2 O 3 -P 2 O 5 slags 40) were compared with all available measured Fe t O activities a Fe t O, measured at different temperatures reported in various literatures by different investigators, respectively. The experimental techniques employed by these investigators for FetO activity measurements in different slags were summarized in Table 2.…”

Section: Definition Of Mass Action Concentration For Iron Oxides Fe Tmentioning

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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“…Al 2 O 3 -MgO sat -Fe t O slags with low FeO content (Ͻ10 wt pct FeO) is limited. [2,[12][13][14][15][16][17] Special reference should be made to the work of Iwase and co-workers, who measured the activ-II. LITERATURE REVIEW ity of FeO in a number of slags using an electromotive force (EMF) technique; their work is summaried by Ogura…”

Section: Introductionmentioning

confidence: 99%

Measurement of FeO activity and solubility of MgO in smelting slags

Liu

Fruehan

Morales

et al. 2001

Metall Mater Trans B

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In bath smelting, the FeO activity of the slag must be known to predict the equilibrium of slag-metal reactions and for effective control of the rate of reduction in the system. Also, knowledge of the solubility of MgO in these slags is useful for reducing refractory consumption. A series of measurements of the FeO activity in simulated bath smelting slags (CaO-SiO 2 -Al 2 O 3 -MgO sat -FeO) were conducted by the electromotive force (EMF) technique. The influence of the slag composition on the relationship between the FeO activity coefficient and FeO content was studied. It has been found that the measured FeO activity coefficient decreases with increasing FeO content in the slag and increases slightly with increasing slag basicity, which is defined as (CaO ϩ MgO)/(SiO 2 ϩ Al 2 O 3 ) on a mole fraction basis.The measured values of the FeO activity coefficient are in reasonable agreement with previously published data. The solubility of MgO was also measured and found to range from 16 to 30 pct and decrease with increasing basicity.

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Activity determinator for the automatic measurements of the chemical potentials of FeO in metallurgical slags

Cited by 37 publications

References 6 publications

Effect of Applied Voltage on Electroreduction with Controlled Oxygen Flow of Molten Slag Containing FeO at 1723 K

Effect of Applied Voltage on Electroreduction with Controlled Oxygen Flow of Molten Slag Containing FeO at 1723 K

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

Measurement of FeO activity and solubility of MgO in smelting slags

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