A novel procedure for processing the xenotime mineral concentrate of southwestern Sinai (55.4% RE2O3 and 0.9% U3O8) has been studied. This procedure is based on leaching of uranium and rare earths from the xenotime concentrate using ferric sulfate solution by hydrolytic leaching with ferric ion, wherein ferric iron is precipitated to generate acid for the leaching step. The obtained slurry is washed by water and sulfuric acid. The relevant conditions of the ferric ion leaching of the concentrate and the washing step have been optimized. From the obtained sulfate liquor, rare earths are directly precipitated as oxalates. Uranium is extracted from the REE-free sulfate solution using ion exchange resin Amberlite IRA-400. Highly pure oxide products of the two interesting metal values, REEs and U, have properly been prepared.

Xenotime Ferric Sulfate Sulfuric Acid Uranium Rare Earths Ion Exchange Resin

Xie F, Zhang TA, Dreisinger D, Doyle F, Miner. Eng., 56, 10 (2014)
Jordens A, Cheng YP, Waters KE, Miner. Eng., 41, 97 (2013)
Zhu ZW, Pranolo Y, Cheng CY, Miner. Eng., 77, 185 (2015)
Gupta CK, Krishnamurthy N, Extractive metallurgy of rare earths, CRC Press, Bhabha Atomic Research Centre, Mumbai, India (2004).
Fawzy MM, El Hady SM, Bakry AR, Al Shami AS, Egypt J. Appl. Sci., 30(11), 480 (2015)
Gupta CK, Krishnamurthy N, Int. Mater. Rev., 37(1), 197 (1992)
Viyayalakshmi R, Mishra SL, Singh H, Gupta CK, Hydrometallurgy, 61(2), 75 (2001)
Alex P, Suri AK, Gupta CK, Hydrometallurgy, 50(3), 331 (1998)
El Hady SM, Bakry AR, Al Shami AS, Fawzy MM, Hydrometallurgy, 163, 115 (2016)
Lever FM, Payne JB, Advances in Extractive Metallurgy, London, the Institution of Mining and Metallurgy, 789 (1968).
Ring RJ, Hydrometallurgy, 6, 89 (1980)
Venter R, Boylett M, Hydrometallurgy Conference 2009, the Southern African Institute of Mining and Metallurgy (2009).
Bowell RJ, Grogan J, Hutton-Ashkenny M, Brough C, Penman K, Sapsford DJ, Miner. Eng., 24(12), 1305 (2011)
Costine A, Nikoloski AN, Da Costa M, Chong KF, Hackl R, Miner. Eng., 53, 84 (2013)
Ram R, Charalambous FA, McMaster S, Pownceby MI, Tardio J, Bhargava SK, Miner. Eng., 5051, 83 (2013)
Bhargava SK, Ram R, Pownceby M, Grocott S, Ring B, Tardio J, Jones L, Hydrometallurgy, 151, 10 (2015)
Miller PC, Spencer RM, Pub. No. WO2013173855 A1 (2013).
Vuorinen A, Hiltunen P, Tuovinen O, Hydrometallurgy, 15(3), 297 (1986)
McKay AD, Meiitis Y, AGSO-Geoscience Australia, Mineral Resources Report 1, ISBN 064247161 (2001), (http://www.ga.gov.au/ image_cache/GA9508.pdf).
Dutrizac JE, Hydrometallurgy, 73, 11 (2004)
Abaa SI, J. Mineralium Deposita, 26(1), 34 (1991)
Finch RJ, Ewing RC, Nuclear Materials J., 190, 133 (1992)
Dardir AM, Ph. D., Thesis, Faculty of Science, Ain Shams University, Cairo, Egypt (1997).
Dutrizac JE, Chen TT, Hydrometallurgy, 98, 128 (2009)
Sperr JA, Solberg TN, Becker SW, Econ. Geol. J., 76(8) (1981)
Dutrizac JE, Riveros PA, Canadian Institute of Mining, Metallurgy and Petroleum, Montreal, Canada, 967 (2006).
Roger B, Herbert J, Clay Clay Min., 45(2), 261 (1997)
Merczenko Z, Balcerzak M, Separation, preconcentration and spectrophotometry in inorganic analysis, Elsevier, 341 (2000).
Davies W, Gray W, Talanta, 11(8), 1203 (1964)