Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System
Na2CO3/NaHCO3 mixtures with different oxidants were used to leach uranium in the lignite which was obtained from Lincang, Yunnan province. The experimental results showed that the optimal solid/liquid ratio and CO32-/HCO3- ratio for uranium leaching were 1 : 20 (g/mL) and 2 : 1, respectively. With t...
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| Format: | Article |
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Wiley
2017-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2017/7130971 |
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| author | Y. Ning Y. Li Y. Zhang P. Tang |
| author_facet | Y. Ning Y. Li Y. Zhang P. Tang |
| author_sort | Y. Ning |
| collection | DOAJ |
| description | Na2CO3/NaHCO3 mixtures with different oxidants were used to leach uranium in the lignite which was obtained from Lincang, Yunnan province. The experimental results showed that the optimal solid/liquid ratio and CO32-/HCO3- ratio for uranium leaching were 1 : 20 (g/mL) and 2 : 1, respectively. With the increase of carbon concentration from 0.1 mol/L to 1.1 mol/L, the leaching efficiency of uranium increased from 14.64% to 42.39% after 6 h leaching. The oxidants could significantly enhance the uranium leaching efficiency, which was up to 72.23% by injecting O2 at 1.5 L/min after 12 h leaching. The oxidative leaching process of uranium from the lignite was better fitted to the pseudo-second-order reaction model. The sequential extraction results illustrated that the oxidants could effectively enhance the leaching of organic matter bound uranium in the lignite, which was decreased from 76.86 mg/kg to 9.00 mg/kg by injecting O2. The infrared spectrum analysis demonstrated that the corresponding transmittance at about 3197 cm−1 was prominently reduced after the oxidative leaching, which intimated that the phenolic and alcoholic hydroxyl might be the main functional groups combined with uranium in the lignite. |
| format | Article |
| id | doaj-art-bb1493a9c5cd4682b3a502e86d99d23c |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
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| series | Geofluids |
| spelling | doaj-art-bb1493a9c5cd4682b3a502e86d99d23c2025-02-03T01:10:17ZengWileyGeofluids1468-81151468-81232017-01-01201710.1155/2017/71309717130971Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- SystemY. Ning0Y. Li1Y. Zhang2P. Tang3School of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaSchool of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaSchool of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaSchool of Environmental Studies, China University of Geosciences, Wuhan 430074, ChinaNa2CO3/NaHCO3 mixtures with different oxidants were used to leach uranium in the lignite which was obtained from Lincang, Yunnan province. The experimental results showed that the optimal solid/liquid ratio and CO32-/HCO3- ratio for uranium leaching were 1 : 20 (g/mL) and 2 : 1, respectively. With the increase of carbon concentration from 0.1 mol/L to 1.1 mol/L, the leaching efficiency of uranium increased from 14.64% to 42.39% after 6 h leaching. The oxidants could significantly enhance the uranium leaching efficiency, which was up to 72.23% by injecting O2 at 1.5 L/min after 12 h leaching. The oxidative leaching process of uranium from the lignite was better fitted to the pseudo-second-order reaction model. The sequential extraction results illustrated that the oxidants could effectively enhance the leaching of organic matter bound uranium in the lignite, which was decreased from 76.86 mg/kg to 9.00 mg/kg by injecting O2. The infrared spectrum analysis demonstrated that the corresponding transmittance at about 3197 cm−1 was prominently reduced after the oxidative leaching, which intimated that the phenolic and alcoholic hydroxyl might be the main functional groups combined with uranium in the lignite.http://dx.doi.org/10.1155/2017/7130971 |
| spellingShingle | Y. Ning Y. Li Y. Zhang P. Tang Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System Geofluids |
| title | Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System |
| title_full | Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System |
| title_fullStr | Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System |
| title_full_unstemmed | Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System |
| title_short | Study on the Oxidative Leaching of Uranium from the Lignite in the CO32-/HCO3- System |
| title_sort | study on the oxidative leaching of uranium from the lignite in the co32 hco3 system |
| url | http://dx.doi.org/10.1155/2017/7130971 |
| work_keys_str_mv | AT yning studyontheoxidativeleachingofuraniumfromtheligniteintheco32hco3system AT yli studyontheoxidativeleachingofuraniumfromtheligniteintheco32hco3system AT yzhang studyontheoxidativeleachingofuraniumfromtheligniteintheco32hco3system AT ptang studyontheoxidativeleachingofuraniumfromtheligniteintheco32hco3system |