Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors
Two processes applying green solvents for recovering rare earth elements (REEs) from different types of aluminate phosphors are demonstrated in this report. For magnesium aluminate-type phosphors, a pretreatment with peroxide calcination was implemented first, and then followed by a supercritical fl...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/3/287 |
| _version_ | 1797541803698683904 |
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| author | Clive H. Yen Rui Cheong |
| author_facet | Clive H. Yen Rui Cheong |
| author_sort | Clive H. Yen |
| collection | DOAJ |
| description | Two processes applying green solvents for recovering rare earth elements (REEs) from different types of aluminate phosphors are demonstrated in this report. For magnesium aluminate-type phosphors, a pretreatment with peroxide calcination was implemented first, and then followed by a supercritical fluid extraction (SFE) process. Supercritical carbon dioxide (sc-CO<sub>2</sub>) provides an effective and green medium for extracting REEs from dry materials. With the addition of a complex agent, tri-n-butyl phosphate-nitric acid complex, highly efficient and selective extraction of REEs using supercritical carbon dioxide can be achieved. The highest extraction efficiency was 92% for europium from the europium doped barium magnesium aluminate phosphor (BAM), whereas the highest extraction selectivity was more than 99% for the REEs combined from the trichromatic phosphor. On the other hand, for strontium aluminate type phosphors, a direct acid leaching process is suggested. It was found out that acetic acid, which is considerably green, could have high recovery rate for dysprosium (>99%) and europium (~83%) from this strontium aluminate phosphor materials. Nevertheless, both green processes showed promising results and could have high potential for industrial applications. |
| first_indexed | 2024-03-10T13:20:55Z |
| format | Article |
| id | doaj.art-098a1fbc3bc4408a8bd8265ad12525d4 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T13:20:55Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-098a1fbc3bc4408a8bd8265ad12525d42023-11-21T09:58:18ZengMDPI AGMinerals2075-163X2021-03-0111328710.3390/min11030287Application of Green Solvents for Rare Earth Element Recovery from Aluminate PhosphorsClive H. Yen0Rui Cheong1Department of Cosmetic Science, Providence University, Taichung City 43301, TaiwanDepartment of Cosmetic Science, Providence University, Taichung City 43301, TaiwanTwo processes applying green solvents for recovering rare earth elements (REEs) from different types of aluminate phosphors are demonstrated in this report. For magnesium aluminate-type phosphors, a pretreatment with peroxide calcination was implemented first, and then followed by a supercritical fluid extraction (SFE) process. Supercritical carbon dioxide (sc-CO<sub>2</sub>) provides an effective and green medium for extracting REEs from dry materials. With the addition of a complex agent, tri-n-butyl phosphate-nitric acid complex, highly efficient and selective extraction of REEs using supercritical carbon dioxide can be achieved. The highest extraction efficiency was 92% for europium from the europium doped barium magnesium aluminate phosphor (BAM), whereas the highest extraction selectivity was more than 99% for the REEs combined from the trichromatic phosphor. On the other hand, for strontium aluminate type phosphors, a direct acid leaching process is suggested. It was found out that acetic acid, which is considerably green, could have high recovery rate for dysprosium (>99%) and europium (~83%) from this strontium aluminate phosphor materials. Nevertheless, both green processes showed promising results and could have high potential for industrial applications.https://www.mdpi.com/2075-163X/11/3/287rare earth elementsphosphorssupercritical carbon dioxidealuminateacid leaching |
| spellingShingle | Clive H. Yen Rui Cheong Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors Minerals rare earth elements phosphors supercritical carbon dioxide aluminate acid leaching |
| title | Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors |
| title_full | Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors |
| title_fullStr | Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors |
| title_full_unstemmed | Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors |
| title_short | Application of Green Solvents for Rare Earth Element Recovery from Aluminate Phosphors |
| title_sort | application of green solvents for rare earth element recovery from aluminate phosphors |
| topic | rare earth elements phosphors supercritical carbon dioxide aluminate acid leaching |
| url | https://www.mdpi.com/2075-163X/11/3/287 |
| work_keys_str_mv | AT clivehyen applicationofgreensolventsforrareearthelementrecoveryfromaluminatephosphors AT ruicheong applicationofgreensolventsforrareearthelementrecoveryfromaluminatephosphors |