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Selective recovery of lanthanides, uranium and thorium from Rosetta monazite mineral concentrate
Separation Science and Technology, 2017An innovative procedure for the selective recovery of lanthanides using (NH4)2SO4 from hydrous oxide cake produced after the alkali breakdown of monazite mineral concentrate was proposed.
T. E. Amer +4 more
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Recovery of thorium (IV) from leached monazite solutions using counter-current extraction
International Journal of Mineral Processing, 2007Abstract A flow sheet was developed to recover thorium from Egyptian monazite sands. The results of a detailed investigation on the extraction and stripping of thorium in the hydrous oxide are obtained after alkaline dissolution followed by leaching with alkaline carbonate solutions.
A.M.I. Ali +3 more
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Immobilization and Recovery of Thorium, A Neptunium Surrogate, using Phase-Separated Glasses
MRS Proceedings, 1996ABSTRACTThe Savannah River Site has the majority of the United States' supply of neptunium currently stored in an acid solution in one of their canyon facilities. A program is being developed that could be utilized to ship this material, as glass, to Oak Ridge National Laboratory ...
T. F. Meaker +4 more
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Thorium and rare earth recovery in Canada: the first 30 years
Canadian Metallurgical Quarterly, 2013AbstractPioneering methods to recover thorium and rare earths as byproducts of uranium recovery were developed and applied in Elliot Lake, Ontario, during the 1960s. The district became a major supplier of these key elements from about 1960 until 1990 and at one stage supplied much of the world’s thorium and perhaps one third of its yttrium. This paper
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Journal of Radioanalytical and Nuclear Chemistry, 2003
A method is developed for the selective leaching of 233U from a thorium oxalate cake. The leaching capacity of ammonium carbonate and nitric acid have been investigated, showing that (NH4)2CO3 leads to higher recovery. The maximum leaching efficiency is obtained using 0.5% ammonium carbonate, with a minimal thorium pick-up. A uranium recovery of 94% is
P. Govindan +6 more
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A method is developed for the selective leaching of 233U from a thorium oxalate cake. The leaching capacity of ammonium carbonate and nitric acid have been investigated, showing that (NH4)2CO3 leads to higher recovery. The maximum leaching efficiency is obtained using 0.5% ammonium carbonate, with a minimal thorium pick-up. A uranium recovery of 94% is
P. Govindan +6 more
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Thorium Recovery from Choghart Mining Waste by Beneficiation Processes
JOM, 2023Morteza Akbari +2 more
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Anion-Exchange Recovery of Thorium from Uranium: Analytical and Preparation Aspects
Radiochemistry, 2003Recovery of thorium from U(VI) containing 20% 235U in 7 M HCl with AV-17-8 chs anionexchanger [GOST (State Standard) 20301-74] was studied using a Ge-Li detector. An 1 cm column in diam-eter with 40-cm resin bed height ensures complete thorium separation from 1 g of U sorbed on the resin.
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Recovery of Uranium and Thorium from Graphite Fuel Elements. I. Grind-Leach Process
Nuclear Science and Engineering, 1960A grind-leach method for the recovery of uranium from high-density graphite fuel elements containing greater than 5 weight per cent uranium has been developed on a laboratory scale as a head-end tr...
Mildred J. Bradley, Leslie M. Ferris
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Russian Journal of Inorganic Chemistry, 2019
The extraction capacities to f elements are studied in a series of bidentate organophosphoric reagents that contain deprotonatable phenol moieties. The dependence of metal [thorium(IV), lanthanum(III), neodymium(III), and holmium(III)] recovery as a function of nitric acid concentration is represented by curves with a maximum, typical of extraction by ...
N. E. Borisova +8 more
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The extraction capacities to f elements are studied in a series of bidentate organophosphoric reagents that contain deprotonatable phenol moieties. The dependence of metal [thorium(IV), lanthanum(III), neodymium(III), and holmium(III)] recovery as a function of nitric acid concentration is represented by curves with a maximum, typical of extraction by ...
N. E. Borisova +8 more
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