Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross
The aluminum dross generated during the aluminum alloy processing and regeneration process contains a large amount of harmful highly reactive aluminum nitride and salts, which can cause environmental pollution. A novel method for preparing calcium aluminate by dry calcification of aluminum dross is...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423015806 |
| _version_ | 1827867603063799808 |
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| author | Mingzhuang Xie Han Lv Fengqin Liu Hongliang Zhao |
| author_facet | Mingzhuang Xie Han Lv Fengqin Liu Hongliang Zhao |
| author_sort | Mingzhuang Xie |
| collection | DOAJ |
| description | The aluminum dross generated during the aluminum alloy processing and regeneration process contains a large amount of harmful highly reactive aluminum nitride and salts, which can cause environmental pollution. A novel method for preparing calcium aluminate by dry calcification of aluminum dross is proposed in this paper to extract valuable aluminum resources while achieving efficient detoxification. Detection methods such as XRD, XRF, and standard dissolution procedures have been applied to characterize the phase transition and reaction behavior of the aluminum extraction process. The results indicate that calcium additives can react with aluminum components in aluminum dross to generate 12CaO·7Al2O3 (C12A7), which is soluble in sodium carbonate solution, thereby separating it from other impurities. Under the optimal roasting conditions, the leaching rate of alumina is 87.89%, and the removal rate of nitrogen, chlorine, and soluble fluorine elements exceeds 99%.Excessive sodium carbonate is required to ensure that the hydrolysis product of C12A7 is calcium carbonate, avoiding the formation of hydrated calcium aluminate precipitates. The optimal leaching conditions are sodium carbonate concentration of 80 g L−1, caustic soda concentration of 5 g L−1, liquid-solid ratio of 8 mL g−1, and leaching time of 30 min. The leaching reaction of calcium aluminate conforms to the unreacted core model controlled by internal diffusion, and the apparent activation energy of the reaction is 18.05 kJ mol−1. |
| first_indexed | 2024-03-12T15:19:49Z |
| format | Article |
| id | doaj.art-58d652f0b0d44a0b9927a998fba0e232 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-12T15:19:49Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-58d652f0b0d44a0b9927a998fba0e2322023-08-11T05:34:22ZengElsevierJournal of Materials Research and Technology2238-78542023-07-012560006010Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum drossMingzhuang Xie0Han Lv1Fengqin Liu2Hongliang Zhao3State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; Corresponding author. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China.State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; Corresponding author. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China.The aluminum dross generated during the aluminum alloy processing and regeneration process contains a large amount of harmful highly reactive aluminum nitride and salts, which can cause environmental pollution. A novel method for preparing calcium aluminate by dry calcification of aluminum dross is proposed in this paper to extract valuable aluminum resources while achieving efficient detoxification. Detection methods such as XRD, XRF, and standard dissolution procedures have been applied to characterize the phase transition and reaction behavior of the aluminum extraction process. The results indicate that calcium additives can react with aluminum components in aluminum dross to generate 12CaO·7Al2O3 (C12A7), which is soluble in sodium carbonate solution, thereby separating it from other impurities. Under the optimal roasting conditions, the leaching rate of alumina is 87.89%, and the removal rate of nitrogen, chlorine, and soluble fluorine elements exceeds 99%.Excessive sodium carbonate is required to ensure that the hydrolysis product of C12A7 is calcium carbonate, avoiding the formation of hydrated calcium aluminate precipitates. The optimal leaching conditions are sodium carbonate concentration of 80 g L−1, caustic soda concentration of 5 g L−1, liquid-solid ratio of 8 mL g−1, and leaching time of 30 min. The leaching reaction of calcium aluminate conforms to the unreacted core model controlled by internal diffusion, and the apparent activation energy of the reaction is 18.05 kJ mol−1.http://www.sciencedirect.com/science/article/pii/S2238785423015806Aluminum drossCalcification processCalcium aluminateDetoxification |
| spellingShingle | Mingzhuang Xie Han Lv Fengqin Liu Hongliang Zhao Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross Journal of Materials Research and Technology Aluminum dross Calcification process Calcium aluminate Detoxification |
| title | Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| title_full | Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| title_fullStr | Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| title_full_unstemmed | Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| title_short | Study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| title_sort | study on phase transformation and reaction behavior of alumina extraction process by calcification of aluminum dross |
| topic | Aluminum dross Calcification process Calcium aluminate Detoxification |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423015806 |
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