Results 291 to 300 of about 16,338 (322)
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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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Selective Recovery of Uranium and Thorium Ions from Dilute Aqueous Solutions by Animal Biopolymers
Biological Trace Element Research, 2002Selective actinide ion recovery from dilute, aqueous, multication waste streams is an important problem. The recovery of uranium (U) and thorium (Th) by various animal biopolymers was examined. Of four species of biopolymers tested, a high uptake of uranium and thorium was found in hen eggshell membrane (ESM) and silk proteins, with the maximum uranium
Shin-ichi, Ishikawa +3 more
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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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Laboratory Development of the Acid Thorex Process For Recovery of Thorium Reactor Fuel
Nuclear Science and Engineering, 1961The Acid Thorex process has been developed on a laboratory scale for recovery of uranium and thorium from spent fuel solutions.
R. H. Rainey, J. G. Moore
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Ion exchange on modified cellulose. II. Recovery of thorium from monazite using cellulose phosphate
Journal of Applied Chemistry, 1959AbstractA process for the recovery of thorium from monazite has been developed using cellulose phosphate as a selective cation‐exchange material. The ore is broken down with sulphuric acid and the leach liquor passed through columns of cellulose phosphate where thorium is preferentially adsorbed, and from which it is subsequently eluted with 10 ...
A. J. Head +3 more
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