Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System
The present study investigated phase equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system experimentally using high-temperature equilibration, quenching, and electron probe X-ray microanalysis (EPMA). New thermodynamic information on the Na<s...
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MDPI AG
2021-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/12/2014 |
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| author | Baojun Zhao Kun Su Xiaodong Ma |
| author_facet | Baojun Zhao Kun Su Xiaodong Ma |
| author_sort | Baojun Zhao |
| collection | DOAJ |
| description | The present study investigated phase equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system experimentally using high-temperature equilibration, quenching, and electron probe X-ray microanalysis (EPMA). New thermodynamic information on the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system was derived based on the newly obtained experimental results and data from the literature. The primary phase fields of sodium metasilicate, sodium disilicate, and tridymite were determined along with the isotherms at 1073, 1173, and 1273 K. The solubilities of WO<sub>3</sub> in SiO<sub>2</sub>, Na<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>, and Na<sub>2</sub>SiO<sub>3</sub>, and the solubility of SiO<sub>2</sub> in Na<sub>2</sub>WO<sub>4</sub> were accurately measured using EPMA. Comparisons between the existing and newly constructed phase diagram were carried out and the differences are discussed. The phase equilibrium data will be beneficial to the future development of sustainable tungsten industries and thermodynamic modelling in WO<sub>3</sub> related systems. |
| first_indexed | 2024-03-10T03:33:53Z |
| format | Article |
| id | doaj.art-1395972d78d74268a91780f38c7a1f70 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:33:53Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-1395972d78d74268a91780f38c7a1f702023-11-23T09:34:16ZengMDPI AGMetals2075-47012021-12-011112201410.3390/met11122014Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> SystemBaojun Zhao0Kun Su1Xiaodong Ma2Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, ChinaSustainable Minerals Institute, University of Queensland, Brisbane 4072, AustraliaSustainable Minerals Institute, University of Queensland, Brisbane 4072, AustraliaThe present study investigated phase equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system experimentally using high-temperature equilibration, quenching, and electron probe X-ray microanalysis (EPMA). New thermodynamic information on the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system was derived based on the newly obtained experimental results and data from the literature. The primary phase fields of sodium metasilicate, sodium disilicate, and tridymite were determined along with the isotherms at 1073, 1173, and 1273 K. The solubilities of WO<sub>3</sub> in SiO<sub>2</sub>, Na<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>, and Na<sub>2</sub>SiO<sub>3</sub>, and the solubility of SiO<sub>2</sub> in Na<sub>2</sub>WO<sub>4</sub> were accurately measured using EPMA. Comparisons between the existing and newly constructed phase diagram were carried out and the differences are discussed. The phase equilibrium data will be beneficial to the future development of sustainable tungsten industries and thermodynamic modelling in WO<sub>3</sub> related systems.https://www.mdpi.com/2075-4701/11/12/2014phase equilibriathermodynamicsNa<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> systemliquidus temperaturepyrometallurgy |
| spellingShingle | Baojun Zhao Kun Su Xiaodong Ma Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System Metals phase equilibria thermodynamics Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system liquidus temperature pyrometallurgy |
| title | Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System |
| title_full | Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System |
| title_fullStr | Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System |
| title_full_unstemmed | Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System |
| title_short | Experimental Determination of Phase Equilibria in the Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> System |
| title_sort | experimental determination of phase equilibria in the na sub 2 sub o sio sub 2 sub wo sub 3 sub system |
| topic | phase equilibria thermodynamics Na<sub>2</sub>O-SiO<sub>2</sub>-WO<sub>3</sub> system liquidus temperature pyrometallurgy |
| url | https://www.mdpi.com/2075-4701/11/12/2014 |
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