Dictyonema black shale and Triassic sandstones as potential sources of uranium
| Autor: | Stanisław Wołkowicz, Grażyna Zakrzewska-Kołtuniewicz, Ewelina Chajduk, Katarzyna Kiegiel, Bożena Danko, Agnieszka Miśkiewicz, Anna Abramowska, Paweł Biełuszka, Dorota Gajda |
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| Rok vydání: | 2015 |
| Předmět: |
inorganic chemicals
Nuclear and High Energy Physics biology Chemistry Science technology industry and agriculture Geochemistry chemistry.chemical_element Uranium Condensed Matter Physics biology.organism_classification complex mixtures Nuclear Energy and Engineering Safety Risk Reliability and Quality Dictyonema Waste Management and Disposal Instrumentation Oil shale uranium ores · leaching · extraction · ion exchange chromatography · precipitation Nuclear chemistry |
| Zdroj: | Nukleonika, Vol 60, Iss 3, Pp 515-522 (2015) |
| ISSN: | 0029-5922 |
| DOI: | 10.1515/nuka-2015-0096 |
| Popis: | The main objective of the present study was an assessment of the possibility of uranium recovery from domestic resources in Poland. In the first stage uranium was leached from the ground uranium ore by using acidic (sulfuric acid or hydrochloric acid) or alkaline (carbonate) solutions. The leaching efficiencies of uranium were dependent on the type of ore and it reached 81% for Dictyonemic shales and almost 100% for sandstones. The novel leaching routes, with the application of the helical membrane contactor equipped with rotating part were tested. The obtained postleaching solutions were concentrated and purified using solvent extraction or ion exchange chromatography. New methods of solvent extraction, as well as hybrid processes for separation and purification of the product, were studied. Extraction with the use of membrane capillary contactors that has many advantages above conventional methods was also proposed as an alternative purification method. The final product U3O8 could be obtained by the precipitation of ‘yellow cake’, followed by calcination step. The results of precipitation of ammonium diuranate and uranium peroxide from diluted uranium solution were presented |
| Databáze: | OpenAIRE |
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