کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5779296 1634387 2017 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geochemical Characterization of U Tailings (Bois Noirs Limouzat, France)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Geochemical Characterization of U Tailings (Bois Noirs Limouzat, France)
چکیده انگلیسی
The uranium (U) mining site of Bois Noirs Limouzat located in the central France, produced 7,000 tons of U from 1959 to 1980. Tailings containing non extracted U and its radioactive progenies are currently stored under water in a basin extending over 18ha. To predict U (100-400 ppm) and 226Ra (10-70Bq.g-1) mobility, a detailed chemical, mineralogical and radiological characterization of the phases is required. For this, tailings sampling was performed to collect undisturbed samples close of in situ conditions. Preliminary characterizations evidenced good correlation between facies (to link with the extraction mode), granulometry, U concentration and 226Ra activity. U and 226Ra are concentrated in the silty-clay facies mainly as inherited monazites and neoformation of uranyl phosphates known for their low solubility. Clay minerals and Fe-oxi-hydroxides are also encountered and may play an important role in radionuclide trapping by sorption processes. These preliminary results confirm the immobilization of U and 226Ra within the tailings, even though, additional experiments are needed to determine the extent of U and 226Ra sorbed on Fe-oxi-hydroxides and on clay minerals.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Procedia Earth and Planetary Science - Volume 17, 2017, Pages 308-311
نویسندگان
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