ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Solvent extraction of uranium and vanadium from carbonate leach solutions of ferruginous siltstone using cetylpyridinium carbonate in kerosene
Mohamed F. Cheira
Nuclear Materials Authority, Cairo, Egypt
Received: 9 October 2019 Accepted: 22 January 2020
The leachability of uranium and vanadium ions was conducted from ferruginous siltstone using carbonate ions. The optimum alkaline leaching parameters for dissolving about 92.92% U(VI), and 94.82% V(V) were 70 mg/L Na2CO3, 150 mg/L NaHCO3, 1:3 solid:liquid (S:L) ratio, and 150 rpm stirring rate, for 5 h leaching time at 50 °C. Uranium and vanadium ions were extracted from the carbonate leach liquor using the prepared cetylpyridinium carbonate [(CP)2CO3] in kerosene. The maximum extraction of U(VI) was gained using 0.012 M/L (CP)2CO3 and 5% (w/v) tridecyl alcohol (TDA) in kerosene from the carbonate leach solution assaying 413 mg/L U(VI) at pH 11 and 3:1 aqueous:organic (A:O) phase. Moreover, the maximum extraction of V(V) was achieved using 0.012 M/L (CP)2CO3 and 5% (w/v) TDA in kerosene from the carbonate leach solution containing 336 mg/L V(V) at pH9, and 3:1 A:O phase ratio. Vanadium ions were scrubbed from the uranium-loaded solvent and then it was followed by uranium stripping while vanadium ions were stripped from the vanadium-loaded solvent. McCabe–Thiele diagrams for U(VI) and V(V) extraction and stripping were constructed to determine the theoretical stages of extraction and stripping. Finally, the optimum conditions were applied to gain the sodium diuranate and ammonium vanadate cakes from carbonate leach liquor with the appropriate purities.
Keywords: Carbonate leaching; Uranium; Vanadium; Cetylpyridinium carbonate; Solvent extraction
Full paper is available at www.springerlink.com.
Chemical Papers 74 (7) 2247–2266 (2020)
Saturday, October 23, 2021