An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes
A novel technique was developed for the recovery of lithium and aluminum from coal fly ash using a combination of pre-desilication and an intensified acid leaching process. The main components of the high-aluminum fly ash were found to be Al2O3 and SiO2, and the Al/Si ratio increased from 1.0 to 1.5...
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| Format: | Article |
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MDPI AG
2017-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/7/7/272 |
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| author | Shenyong Li Shenjun Qin Lianwei Kang Jianjun Liu Jing Wang Yanheng Li |
| author_facet | Shenyong Li Shenjun Qin Lianwei Kang Jianjun Liu Jing Wang Yanheng Li |
| author_sort | Shenyong Li |
| collection | DOAJ |
| description | A novel technique was developed for the recovery of lithium and aluminum from coal fly ash using a combination of pre-desilication and an intensified acid leaching process. The main components of the high-aluminum fly ash were found to be Al2O3 and SiO2, and the Al/Si ratio increased from 1.0 to 1.5 after desiliconization. The lithium content of the coal fly ash met national recycling standards. The optimal acid leaching conditions, under which the leaching efficiencies of lithium and aluminum were 82.23% and 76.72%, respectively, were as follows: 6 mol/L HCl, 1:20 solid to liquid ratio, 120 °C and 4 h. During the hydrochloric acid pressure leaching process, spherical particles of desilicated fly ash were decomposed into flakes. Part of the mullite phase was dissolved, and most of the glass phase leached into the liquor. The generation of the silicates hindered lithium transport, which decreased the leaching rate of lithium. This work suggests that the preprocessing is a promising option for effective recovery of high-aluminum and fly ash-associated lithium. |
| first_indexed | 2024-04-12T13:44:09Z |
| format | Article |
| id | doaj.art-c030c0fde8f44d40af1fa29b130b6f4c |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-04-12T13:44:09Z |
| publishDate | 2017-07-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-c030c0fde8f44d40af1fa29b130b6f4c2022-12-22T03:30:45ZengMDPI AGMetals2075-47012017-07-017727210.3390/met7070272met7070272An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching ProcessesShenyong Li0Shenjun Qin1Lianwei Kang2Jianjun Liu3Jing Wang4Yanheng Li5Key Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaKey Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaKey Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaKey Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaKey Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaKey Laboratory for Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, ChinaA novel technique was developed for the recovery of lithium and aluminum from coal fly ash using a combination of pre-desilication and an intensified acid leaching process. The main components of the high-aluminum fly ash were found to be Al2O3 and SiO2, and the Al/Si ratio increased from 1.0 to 1.5 after desiliconization. The lithium content of the coal fly ash met national recycling standards. The optimal acid leaching conditions, under which the leaching efficiencies of lithium and aluminum were 82.23% and 76.72%, respectively, were as follows: 6 mol/L HCl, 1:20 solid to liquid ratio, 120 °C and 4 h. During the hydrochloric acid pressure leaching process, spherical particles of desilicated fly ash were decomposed into flakes. Part of the mullite phase was dissolved, and most of the glass phase leached into the liquor. The generation of the silicates hindered lithium transport, which decreased the leaching rate of lithium. This work suggests that the preprocessing is a promising option for effective recovery of high-aluminum and fly ash-associated lithium.https://www.mdpi.com/2075-4701/7/7/272coal fly ashpre-desilicationacid leachinglithiumhigh-aluminum |
| spellingShingle | Shenyong Li Shenjun Qin Lianwei Kang Jianjun Liu Jing Wang Yanheng Li An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes Metals coal fly ash pre-desilication acid leaching lithium high-aluminum |
| title | An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes |
| title_full | An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes |
| title_fullStr | An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes |
| title_full_unstemmed | An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes |
| title_short | An Efficient Approach for Lithium and Aluminum Recovery from Coal Fly Ash by Pre-Desilication and Intensified Acid Leaching Processes |
| title_sort | efficient approach for lithium and aluminum recovery from coal fly ash by pre desilication and intensified acid leaching processes |
| topic | coal fly ash pre-desilication acid leaching lithium high-aluminum |
| url | https://www.mdpi.com/2075-4701/7/7/272 |
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