Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals
This paper deals a with the study of an innovative method for processing the Oman placer ores by alkaline leaching in ball mill autoclaves, where grinding and leaching of the refractory minerals take place simultaneously. This was followed by the selective separation of thorium and uranium from lant...
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| Format: | Article |
| Language: | fas |
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Nuclear Science and Technology Research Institute
2011-11-01
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| Series: | مجله علوم و فنون هسته‌ای |
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| Online Access: | https://jonsat.nstri.ir/article_413_b23d40f3c23fe0100ff4218d4a89db31.pdf |
| _version_ | 1797835045084332032 |
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| author | S A. Milani A Sam |
| author_facet | S A. Milani A Sam |
| author_sort | S A. Milani |
| collection | DOAJ |
| description | This paper deals a with the study of an innovative method for processing the Oman placer ores by alkaline leaching in ball mill autoclaves, where grinding and leaching of the refractory minerals take place simultaneously. This was followed by the selective separation of thorium and uranium from lanthanides by autoclave leaching of the hydroxide cake with ammonium carbonate-bicarbonate solutions. The introduced method is based on the fact that thorium and uranium form soluble carbonate complexes with ammonium carbonate, while lanthanides form sparingly soluble double carbonates. It was found that a complete alkaline leaching of Oman placer ores (98.0%) was attained at 150 and 175°C within 2.5 and 2h, respectively. Oman placer ores leaching was intensified and accelerated in a ball mill autoclaves as a result of the grinding action of steel balls, removal of the hydroxide layer covering ores grains and the continuous contact of fresh ore grains with alkaline solution. The study of selective carbonate processing of hydroxide cake with ammonium carbonate-bicarbonate solutions on autoclave under pressure revealed that the complete thorium recovery (97.5%) with uranium recovery (90.8%) and their separation from the lanthanides were attained at 70-80°C during 1-2h. The extraction of lanthanides in carbonate solution was low and did not exceed 4.6%. |
| first_indexed | 2024-04-09T14:48:07Z |
| format | Article |
| id | doaj.art-b702a192a1534c879524739fd4864bda |
| institution | Directory Open Access Journal |
| issn | 1735-1871 2676-5861 |
| language | fas |
| last_indexed | 2024-04-09T14:48:07Z |
| publishDate | 2011-11-01 |
| publisher | Nuclear Science and Technology Research Institute |
| record_format | Article |
| series | مجله علوم و فنون هسته‌ای |
| spelling | doaj.art-b702a192a1534c879524739fd4864bda2023-05-02T10:46:20ZfasNuclear Science and Technology Research Instituteمجله علوم و فنون هسته‌ای1735-18712676-58612011-11-013235967413Alkaline Autoclave Leaching of Refractory Uranium-Thorium MineralsS A. Milani0A Sam1پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایرانبخش مهندسی معدن، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، صندوق پستی: 7616914111، کرمان ـ ایرانThis paper deals a with the study of an innovative method for processing the Oman placer ores by alkaline leaching in ball mill autoclaves, where grinding and leaching of the refractory minerals take place simultaneously. This was followed by the selective separation of thorium and uranium from lanthanides by autoclave leaching of the hydroxide cake with ammonium carbonate-bicarbonate solutions. The introduced method is based on the fact that thorium and uranium form soluble carbonate complexes with ammonium carbonate, while lanthanides form sparingly soluble double carbonates. It was found that a complete alkaline leaching of Oman placer ores (98.0%) was attained at 150 and 175°C within 2.5 and 2h, respectively. Oman placer ores leaching was intensified and accelerated in a ball mill autoclaves as a result of the grinding action of steel balls, removal of the hydroxide layer covering ores grains and the continuous contact of fresh ore grains with alkaline solution. The study of selective carbonate processing of hydroxide cake with ammonium carbonate-bicarbonate solutions on autoclave under pressure revealed that the complete thorium recovery (97.5%) with uranium recovery (90.8%) and their separation from the lanthanides were attained at 70-80°C during 1-2h. The extraction of lanthanides in carbonate solution was low and did not exceed 4.6%.https://jonsat.nstri.ir/article_413_b23d40f3c23fe0100ff4218d4a89db31.pdfalkaline autoclave leachinguranium-thorium refractory mineralsball mill autoclaveoman placer |
| spellingShingle | S A. Milani A Sam Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals مجله علوم و فنون هسته‌ای alkaline autoclave leaching uranium-thorium refractory minerals ball mill autoclave oman placer |
| title | Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals |
| title_full | Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals |
| title_fullStr | Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals |
| title_full_unstemmed | Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals |
| title_short | Alkaline Autoclave Leaching of Refractory Uranium-Thorium Minerals |
| title_sort | alkaline autoclave leaching of refractory uranium thorium minerals |
| topic | alkaline autoclave leaching uranium-thorium refractory minerals ball mill autoclave oman placer |
| url | https://jonsat.nstri.ir/article_413_b23d40f3c23fe0100ff4218d4a89db31.pdf |
| work_keys_str_mv | AT samilani alkalineautoclaveleachingofrefractoryuraniumthoriumminerals AT asam alkalineautoclaveleachingofrefractoryuraniumthoriumminerals |