COSMO-RS method was used in screening 2106 ionic liquids as alternate solvents to volatile ndodecane used in PUREX. The distribution coefficients of uranylnitrate in ionic liquids/aqueous nitric acid biphasic system and the solubility of the ionic liquids in water were determined using COSMO-RS. Seventeen ionic liquids based on tetrafluoroborate BF 4 , were the most hydrophobic than others screened with hexamethylguanidiumtetrafluoroborate having the highest distribution coefficient. Their distribution coefficients were higher than that of the convention n-dodecane used for separation of uranium and plutonium from spent nuclear fuel but having more hydrophilicity than n-dodecane. This shows that ionic liquids can be used as alternate solvents in PUREX.
X-ray fluorescence (XRF) was evaluated as a technique that can facilitate identification of potential environmental hazards associated with mining and ore processing as well as provide quantitative evaluation of the economic potential intrinsic to a mineral deposit. Four different geological samples were analyzed using energy dispersive XRF to demonstrate the utility of the technique. The samples were obtained from Dutsen Wai, Birnin Gwari, Dan Sadau, and Talata Mafara, Nigeria. Wolframite, molybdenum, lead and copper ore were analyzed respectively. Wolframite ore contained 61.93% WO 3 , molybdenum ore contained 16.0% MoO 3 , lead ore contained 83.1% PbO, and copper ore contained 23.26% CuO.
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