Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation
Dumping or disposal of fly ash causes environmental pollution and huge waste of valuable metals. In this work, carbothermic reduction of fly ash under normal pressure to produce Al-Si-Fe alloy, and thermal reduction of magnesia to produce magnesium in vacuum with Al-Si-Fe alloy were investigated. In...
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Technical Faculty, Bor
2021
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oai:doaj.org-article:f2df8d0a1d2f4d6095268e8fc33341fc2021-11-22T11:04:01ZThermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation1450-53392217-717510.2298/JMMB210118038Yhttps://doaj.org/article/f2df8d0a1d2f4d6095268e8fc33341fc2021-01-01T00:00:00Zhttp://www.doiserbia.nb.rs/img/doi/1450-5339/2021/1450-53392100038Y.pdfhttps://doaj.org/toc/1450-5339https://doaj.org/toc/2217-7175Dumping or disposal of fly ash causes environmental pollution and huge waste of valuable metals. In this work, carbothermic reduction of fly ash under normal pressure to produce Al-Si-Fe alloy, and thermal reduction of magnesia to produce magnesium in vacuum with Al-Si-Fe alloy were investigated. In addition, the surface morphology and composition of Al-Si-Fe alloy and magnesium were studied by means of SEM-EDS and XRD. Based on the thermodynamic analysis, it was found that AlN and SiO2 lowered down the reduction temperature of SiC and Al4C3, respectively. Increase of temperature and decrease of vacuum degree promotes the thermal reduction of magnesia. Results showed that the recovery rate ranked Fe, Si, and Al in a descending order. The evaporation loss of gaseous SiO and Al2O reduced the recovery of Si and Al. Al-Si-Fe alloy containing 33.12% Al, 48.73% Si, and 6.41% Fe is obtained under the optimal conditions. Magnesium with the content of 94.87% is prepared using the obtained Al-Si-Fe alloy as a reductant. The nucleation rate is less than the growth rate during the condensation of magnesium vapor.Yu Q.-C.Deng Y.Yin S.-B.Li Z.-Y.Technical Faculty, Borarticlecoal fly ashcarbothermic reductionaluminothermic reductional-si-fe alloymagnesiumMining engineering. MetallurgyTN1-997ENJournal of Mining and Metallurgy. Section B: Metallurgy, Vol 57, Iss 3, Pp 421-430 (2021) |
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DOAJ |
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| topic |
coal fly ash carbothermic reduction aluminothermic reduction al-si-fe alloy magnesium Mining engineering. Metallurgy TN1-997 |
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coal fly ash carbothermic reduction aluminothermic reduction al-si-fe alloy magnesium Mining engineering. Metallurgy TN1-997 Yu Q.-C. Deng Y. Yin S.-B. Li Z.-Y. Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| description |
Dumping or disposal of fly ash causes environmental pollution and huge waste of valuable metals. In this work, carbothermic reduction of fly ash under normal pressure to produce Al-Si-Fe alloy, and thermal reduction of magnesia to produce magnesium in vacuum with Al-Si-Fe alloy were investigated. In addition, the surface morphology and composition of Al-Si-Fe alloy and magnesium were studied by means of SEM-EDS and XRD. Based on the thermodynamic analysis, it was found that AlN and SiO2 lowered down the reduction temperature of SiC and Al4C3, respectively. Increase of temperature and decrease of vacuum degree promotes the thermal reduction of magnesia. Results showed that the recovery rate ranked Fe, Si, and Al in a descending order. The evaporation loss of gaseous SiO and Al2O reduced the recovery of Si and Al. Al-Si-Fe alloy containing 33.12% Al, 48.73% Si, and 6.41% Fe is obtained under the optimal conditions. Magnesium with the content of 94.87% is prepared using the obtained Al-Si-Fe alloy as a reductant. The nucleation rate is less than the growth rate during the condensation of magnesium vapor. |
| format |
article |
| author |
Yu Q.-C. Deng Y. Yin S.-B. Li Z.-Y. |
| author_facet |
Yu Q.-C. Deng Y. Yin S.-B. Li Z.-Y. |
| author_sort |
Yu Q.-C. |
| title |
Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| title_short |
Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| title_full |
Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| title_fullStr |
Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| title_full_unstemmed |
Thermal process for magnesium production with Al-Si-Fe from coal fly ash: Thermodynamics and experimental investigation |
| title_sort |
thermal process for magnesium production with al-si-fe from coal fly ash: thermodynamics and experimental investigation |
| publisher |
Technical Faculty, Bor |
| publishDate |
2021 |
| url |
https://doaj.org/article/f2df8d0a1d2f4d6095268e8fc33341fc |
| work_keys_str_mv |
AT yuqc thermalprocessformagnesiumproductionwithalsifefromcoalflyashthermodynamicsandexperimentalinvestigation AT dengy thermalprocessformagnesiumproductionwithalsifefromcoalflyashthermodynamicsandexperimentalinvestigation AT yinsb thermalprocessformagnesiumproductionwithalsifefromcoalflyashthermodynamicsandexperimentalinvestigation AT lizy thermalprocessformagnesiumproductionwithalsifefromcoalflyashthermodynamicsandexperimentalinvestigation |
| _version_ |
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