Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method
The thermodynamics of manganese oxide in high-MnO-containing slags was investigated using the chemical equilibrium method in the temperature range of 1623 to 1723 K. MnO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slags were brought into equilibrium with molten si...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/11/8/1190 |
| _version_ | 1797522939965341696 |
|---|---|
| author | Elizaveta Cheremisina Xu Gao Shigeru Ueda Shin-ya Kitamura Ryo Yamashina Johannes Schenk |
| author_facet | Elizaveta Cheremisina Xu Gao Shigeru Ueda Shin-ya Kitamura Ryo Yamashina Johannes Schenk |
| author_sort | Elizaveta Cheremisina |
| collection | DOAJ |
| description | The thermodynamics of manganese oxide in high-MnO-containing slags was investigated using the chemical equilibrium method in the temperature range of 1623 to 1723 K. MnO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slags were brought into equilibrium with molten silver (Ag) under controlled CO/CO<sub>2</sub> gas atmosphere. The equilibrium Mn concentration in the silver was measured by ICP-AES (inductively coupled plasma atomic emission spectroscopy) analysis after the experiment. Slag samples were analyzed by EPMA (electron probe microanalyzer) analysis. The obtained activity <i>a</i><sub>MnO</sub> and activity coefficient <i>γ</i><sub>MnO</sub> were derived as a function of the slag composition and temperature. The activity coefficient of MnO within the investigated slag system increased with an increasing MnO/SiO<sub>2</sub> ratio. The derived temperature dependence of the activity coefficient and partition ratio of Mn between the metal and the slag was strongly influenced by the slag composition. The thermodynamic assessment of the activity and activity coefficient of MnO was carried out by applying the regular solution model (RSM) on the basis of interaction energies of the cations and with FactSage<sup>TM</sup> 7.3. The theoretical calculations were compared with the experimentally derived values. |
| first_indexed | 2024-03-10T08:36:27Z |
| format | Article |
| id | doaj.art-bf102d164f1b4648b2140437bda8abee |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T08:36:27Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-bf102d164f1b4648b2140437bda8abee2023-11-22T08:40:48ZengMDPI AGMetals2075-47012021-07-01118119010.3390/met11081190Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium MethodElizaveta Cheremisina0Xu Gao1Shigeru Ueda2Shin-ya Kitamura3Ryo Yamashina4Johannes Schenk5K1-MET GmbH, 4020 Linz, AustriaSchool of Metallurgical and Ecological Engineering, University of Science & Technology Beijing, Haidian Distinct, Beijing 100083, ChinaInstitute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, JapanInstitute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, JapanNippon Steel, Tokyo 102-8688, JapanDepartment Metallurgy, Montanuniversität Leoben, 8700 Leoben, AustriaThe thermodynamics of manganese oxide in high-MnO-containing slags was investigated using the chemical equilibrium method in the temperature range of 1623 to 1723 K. MnO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> slags were brought into equilibrium with molten silver (Ag) under controlled CO/CO<sub>2</sub> gas atmosphere. The equilibrium Mn concentration in the silver was measured by ICP-AES (inductively coupled plasma atomic emission spectroscopy) analysis after the experiment. Slag samples were analyzed by EPMA (electron probe microanalyzer) analysis. The obtained activity <i>a</i><sub>MnO</sub> and activity coefficient <i>γ</i><sub>MnO</sub> were derived as a function of the slag composition and temperature. The activity coefficient of MnO within the investigated slag system increased with an increasing MnO/SiO<sub>2</sub> ratio. The derived temperature dependence of the activity coefficient and partition ratio of Mn between the metal and the slag was strongly influenced by the slag composition. The thermodynamic assessment of the activity and activity coefficient of MnO was carried out by applying the regular solution model (RSM) on the basis of interaction energies of the cations and with FactSage<sup>TM</sup> 7.3. The theoretical calculations were compared with the experimentally derived values.https://www.mdpi.com/2075-4701/11/8/1190MnO activitychemical equilibriumselective reductionactivity coefficient of MnOmanganese distributionregular solution model |
| spellingShingle | Elizaveta Cheremisina Xu Gao Shigeru Ueda Shin-ya Kitamura Ryo Yamashina Johannes Schenk Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method Metals MnO activity chemical equilibrium selective reduction activity coefficient of MnO manganese distribution regular solution model |
| title | Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method |
| title_full | Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method |
| title_fullStr | Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method |
| title_full_unstemmed | Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method |
| title_short | Experimental Determination of the MnO Activity Coefficient in High-Manganese Slags Using the Chemical Equilibrium Method |
| title_sort | experimental determination of the mno activity coefficient in high manganese slags using the chemical equilibrium method |
| topic | MnO activity chemical equilibrium selective reduction activity coefficient of MnO manganese distribution regular solution model |
| url | https://www.mdpi.com/2075-4701/11/8/1190 |
| work_keys_str_mv | AT elizavetacheremisina experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod AT xugao experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod AT shigeruueda experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod AT shinyakitamura experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod AT ryoyamashina experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod AT johannesschenk experimentaldeterminationofthemnoactivitycoefficientinhighmanganeseslagsusingthechemicalequilibriummethod |