Abstract
A procedure for selective recovery of uranium from a hydrous oxide cake produced after alkali breakdown of Rosetta monazite mineral concentrate was proposed. This procedure was based on using urea as a leaching and chelating agent. The proposed procedure involved selective leaching of uranium (98%) using 150 g/L urea within 5 h agitation time, 400 rpm agitation speed at 25 °C and solid/liquid (S/L) ratio of 1/4 (weight/volume), leaving behind thorium (Th) and rare earth elements (REEs) content. Kinetics of leaching process as well as reaction mechanism between urea and uranium has been discussed. The results show that the predominant dissolution mechanism of uranium was chemically controlled and the apparent activation energy was 45.103 kJ/mole. The work was then shifted to separate Th selectively from the combined Th–REEs hydroxide cake via alkali dissolution of Th using a mixed weight of 3/1 Na2CO3/NaHCO3 in a total concentration of 150 g/L. Finally, a tentative flow-sheet for selective recovery of U, Th and REEs from the studied hydrous oxide cake was presented.
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References
Gupta CK, Mukherjee TK (1990) Hydrometallurgy in extraction process. Lib Congress 1:90–1561 (ISBN 0-8493-6804. Printed by United States)
Alex P, Suri AK, Gupta CK (1998) Processing of xenotime concentrate. Hydrometallurgy 50:331–338
Xie F, An Zhang T, Dreisinger D, Doyle F (2014) A critical review on solvent extraction of rare earths from aqueous solutions. Miner Eng 56:10–28
Brisson VL, Zhuang WQ, Alvarez-Cohen L (2016) Bioleaching of rare earth elements from monazite sand. Biotechnol Bioeng 113:339–348
Gupta CK, Krishnamurthy N (2005) Extractive metallurgy of rare earths. CRC Press, NY
De Rohden C, Seine N, Peltier M (1950) Treatment of monazite. US 2783125A
Hart K, Levins DM (1988) Management of wastes from the processing of rare earth minerals [online]. In: Chemeca 88 (16th: 1988: Sydney, NSW). Chemeca 88: Australia’s Bicentennial International Conference for the Process Industries; Preprints of Papers. Barton, ACT: Institution of Engineers, Australia, 1988: 82–88. National conference publication (Institution of Engineers, Australia); no. 88/16. https://search.informit.com.au/documentSummary;dn=844874222508066;res=IELENG>. Accessed 08 Mar 18 (ISBN: 0858254093)
Amer TE, El-Sheikh EM, Gado MA, Abu-Khoziem HA, Zaki SA (2018) Selective recovery of lanthanides, uranium and thorium from Rosetta monazite mineral concentrate. Sep Sci Technol 53(10):1522–1530
Amer TE, Abdella WM, Wahab GM, El-Sheikh EM (2013) A suggested alternative procedure for processing of monazite mineral concentrate. Int J Miner Process 125:106–111
Gentile PS, Talley LH, Collopy TJ (1959) The chemistry of uranyl nitrate–hydroxide–urea systems. J Inorg Nucl Chem 10(1–2):110–113
Manchanda VK, Pathak PN (2004) Amides and diamides as promising extractants in the back end of the nuclear fuel cycle: an overview. Sep Purif Technol 35:85–103
Jr Siddall (1960) Effects of structure of N,N-disubstituted amides on the extraction of actinide and zirconium nitrates and of nitric acid. J Phys Chem 64:1863–1866
Tian Y, Fu J, Zhang Y, Cao K, Bai C, Wang D, Li S, Xue Y, Ma L, Zheng C (2015) Ligand-exchange mechanism: new insight into solid-phase extraction of uranium based on a combined experimental and theoretical study. Phys Chem Chem Phys 17:7214–7223
Gentile JR, Roden AH, Klein RD (1972) An analysis-of-variance model for the intrasubject replication design. J Appl Behav Anal 5:193–198
Nichols P, Bylaska EJ, Schenter GK, de Jong W (2008) Equatorial and apical solvent shells of the UO2 2+ ion. J Chem Phys A 128:124507
Shamov GA, Schreckenbach G (2005) Density functional studies of actinyl aquo complexes studied using small-core effective core potentials and a scalar four-component relativistic method. J Phys Chem A 109(48):10961–10974
Nguyen-Trung C, Palmer DA, Begun GM, Peiffert C, Mesmer RE (2000) Aqueous uranyl complexes 1. raman spectroscopic study of the hydrolysis of uranyl(VI) in solutions of trifluoro methane sulfonic acid and/or tetra-methyl ammonium Hydroxide at 25 °C and 0.1 Mpa. J Sol Chem 29:101–129
Clark DL, Conradson SD, Donohoe RJ, Keogh DW, Morris DE, Palmer PD, Rogers RD, Tait CD (1999) Chemical speciation of the uranyl ion under highly alkaline conditions. Synthesis, structures, and oxo ligand exchange dynamics. Inorg Chem 38(7):1456–1466
Tsushima S, Rossberg A, Ikeda A, Muller K, Scheinost AC (2007) Stoichiometry and structure of uranyl(VI) hydroxo dimer and trimer complexes in aqueous solution. Inorg Chem 46(25):10819–10826
Oda Y, Aoshima A (2002) Ab initio quantum chemical study on charge distribution and molecular structure of uranyl (VI) species with Raman Frequency. J Nucl Sci Technol 39(6):647–654
Soderholm L, Skanthakumar S, Neuefeind J (2005) Determination of actinide speciation in solution using high-energy X-ray scattering. Anal Bioanal Chem 383(1):48–55
Wahlgren U, Moll H, Grenthe I, Schimmelpfennig B, Maron L, Vallet V, Gropen O (1999) Structure of uranium(VI) in strong alkaline solutions: a combined theoretical and experimental investigation. J Phys Chem A 103(41):8257–8264
Neuefeind J, Soderholm L, Skanthakumar S (2004) Experimental coordination environment of uranyl(VI) in aqueous solution. J Phys Chem A 108(14):2733–2739
El-Sheikh EM, Ali SA, Ghazala RA, Abdelwarith A, Salem F (2015) Leaching characteristics of uranium and copper from their mineralization in the carbonate rich latosol of Abu Thor locality, SW Sinai, Egypt. Isotop Radiat Res 47(2):231–246
Merczenko Z (1986) Separation and spectrophotometric determination of elements. Harwood, New York, p 708
Mathew KJ, Bürger S, Ogt SV, Mason PM, Narayanan UI (2009) Uranium assay determination using Davies and Gray titration Proceedings of The Eighth International Conference on Methods and Applications of Radio analytical Chemistry (Marc VIII) Kailua-Kona, Hawaii, 5
Osman AA (2014) Investigation of uranium binding forms in environmentally relevant waters and bio-fluids. Ph.D, thesis, im Institut für Ressourcenökologie, Helmholtz-Zentrum Dresden-Rossendorf e.V. angefertigt, p 120
Levenspiel O (1999) Chemical reaction engineering. Wiley, New York, Chichester, Weinheim, Brisbane, Toronto, p 684
Crundwell FK (2013) The dissolution and leaching of minerals. Mechanisms, myths and misunderstandings. Hydrometallurgy 139:132–148
Harris JO, Robson AH (1948) Structure of urea. Nature 161:98
Venkatesan VK, Suryanarayana CV (1956) Conductance and other physical properties of urea solutions. J Phys Chem 60:775–776
Van Staveren CJ, Fenton DE, Reinhoudt DN, Van Eerden J, Harkema S (1987) Complexation of Urea and UO2 2+ in a Schiff Base Macrocycle: a Mimic of an Enzyme Binding Site. J Am Chem Soc 109:3456–3458
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Amer, T.A., El-Sheikh, E.M., Hassanin, M.A. et al. Processing of Monazite Mineral Concentrate for Selective Recovery of Uranium. Chemistry Africa 2, 123–134 (2019). https://doi.org/10.1007/s42250-018-00037-8
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DOI: https://doi.org/10.1007/s42250-018-00037-8