This chapter is about the deposits and the mineral occurrences containing uranium, thorium and rare earth elements in Turkey. The data include exploration studies and the formation/origin and ...
Uranium is extracted from the pregnant solution as uranyl sulfate anionic complexes while all elements in cationic form pass into the sorption filtrate solution. Scandium, thorium and REE remain as cations under these conditions and these metals can be recovered downstream.
In the thorium–uranium fuel cycle, 232Th will produce fissional 233U and radioactive 232U simultaneously after irradiation. The selective separation of uranium from thorium-based spent fuel can enhance the utilization efficiency of nuclear fuel and promote the safety of nuclear energy utilization. In this work, a new type of unsymmetrical acidic …
An unmet challenge in the thorium-uranium fuel cycle is the efficient separation of uranium from thorium. Herein, two new tetradentate N,O-hybrid ligands, N,N′-diethyl-N,N′-di-p-tolyl-2,2′-bipyridine-6,6′-dicarboxamide (Et-Tol-BPDA) and N,N′-diethyl-N,N′-di-p-tolyl-2,2′-bipyrimidine-4,4′-dicarboxamide (Et-Tol-BPymDA), comprising …
It is especially a great source of scandium, which is the most valuable rare earth element among the group. ... By converting thorium to uranium, thorium can effectively replace uranium-based nuclear reactors and become an alternative to uranium sources (Xiong et al., 2020). Therefore, if the standards are met, thorium and uranium …
@article{osti_4166466, title = {A PROCESS FOR THE RECOVERY OF URANIUM AND SCANDIUM FROM URANIUM REFINERY RAFFINATES}, author = {Lang, G P and Kuhlman, C W and Ruehle, A E}, abstractNote = {A process for the removal of the residual uranium amd scandium from refinery raffinates based on an extraction with TBP, …
Rare earth (RE) elements is usually associated with radioactive thorium (Th) in nature. Here, we develop a new solid-phase extraction system for the separation of Th, and the effects of acidity, equilibrium time and cycle times on the adsorption performance of the resin were investigated. Kinetic studies show the extraction system has excellent …
The separation of uranium and thorium from rare earths is often a big concern in rare earth industry in order to reasonably manage the radioactive ... (except for scandium) is in the range of 6.8–8.0 in chloride and sulphate media and the precipitation pH decreases from light to heavy rare earths (Xu, 1995). Thorium precipitation from ...
Thorium boasts several advantages over the conventional nuclear fuel, uranium-235. Thorium can generate more fissile material (uranium-233) than it consumes while fuelling a water-cooled or molten-salt reactor.According to estimates, the Earth's upper crust contains an average of 10.5 parts per million (ppm) of thorium, compared …
As can be seen from Table I, mixtures contain- ing scandium and thorium/or uranium in widely varying ratios can be analyzed suc- cessfully. If thorium is present in sample mixtures along with weighable amounts of scandium, thorium should be elutcd with a magnesium nitrate solution greater than 2.5 M, otherwise it tends to break through in an ...
In the thorium–uranium fuel cycle, 232Th will produce fissional 233U and radioactive 232U simultaneously after irradiation. The selective separation of uranium …
E30 Cation-exchange Separation of Thorium(Zirconium), Scandium(Uranium) and Rare Earth with Arsenazo M as the Eluant CHENG JAI-KAI*, LI BU-HAI, TIAN SHI-ZHONG and LI YU-WU Laboratory of Analytical Chemistry, Department of Chem- istry, Wuhan University, Wuhan, China Strong inorganic acids [1,2] and …
The contents of scandium, uranium and thorium in the cakes, obtained after the sulphuric acid consumption of 0.3 g/g of dried red mud were: 0.004%; 0.0005% and 0.0045%, respectively, and for the sorption/sulphuric acid dissolution they were: 0.003%; 0.0001 %; and 0.0038%, respectively. It has been found 0.016- 0.014 0.012 G 0.01 . d …
DOI: 10.1016/j.seppur.2023.125028 Corpus ID: 261667037; Selective separation of radioactive thorium and uranium from scandium using N-heterocyclic carboxamide …
Keywords Scandium/thorium separation Uranium leach liquors Ion exchange Desorption Introduction A high diversity of scandium applications results in a high demand of this metal in the global ...
A simulated solution containing uranium (43.59 ppm), thorium (44.07 ppm), and scandium (3803.12 ppm) was prepared by dissolving the metallic nitrate in 1 M …
but this method cannot determine the content of uranium oxide in scandium oxide; GB/T 18114.2-2010 introduces the method for determining the content of thorium oxide in rare earth concentrate by ...
This method can be used for the accurate determination of trace Th and U in high Sc matrix samples, which provides an effective technical support for the preparation of high purity scandium oxide ...
By James Hamblin. May 20, 2014. Paris Gray, upstanding vice president of her about-to-graduate high-school class in Jonesboro, Georgia, was suspended last Friday when administrators figured out ...
This patent describes a method for separating scandium and thorium comprising the following steps: Step 1--adjusting a solution comprising scandium and thorium to an acid pH to form an acid solution having a pH of about 1.95; Step 2--contacting the acid solution from step 1 with a cation exchange resin, the cation …
The range for determining the thorium oxide content is 0.30–8.00%, which is not appropriate for determining trace thorium oxide, and the method cannot determine …
Scandium is a valuable strategic resource widely dispersed in nature and frequently coexists with other minerals, some of which contain radionuclides, particularly uranium and thorium. It is of great importance to remove these radioactive elements in a green and efficient manner to manufacture superior scandium products. The present …
Scandium is a valuable strategic resource widely dispersed in nature and frequently coexists with other minerals, some of which contain radionuclides, particularly uranium and thorium.
Thorium-230 (historical name is ionium) belongs to the radioactive family of uranium-238 (238U, 230Th, 226Ra, 210Pb). It is formed as a result of the α-decay of uranium-234, which has a half-life of ~2.5 × 105 years. As a result of the decay of 230Th (the half-life is more than 75 thousand years), 226Ra is formed.
An unmet challenge in the thorium-uranium fuel cycle is the efficient separation of uranium from thorium. Herein, two new tetradentate N,O-hybrid ligands, N,N′-diethyl-N,N′-di-p-tolyl-2,2′ …
Scandium is a valuable strategic resource widely dispersed in nature and frequently coexists with other minerals, some of which contain radionuclides, particularly uranium and thorium. It is of great importance to remove these radioactive elements in a green and efficient manner to manufacture superior scandium products.
Under optimum conditions, 95.3% of uranium and 70.7% of thorium were extracted with only a 3.6% loss of scandium after a single-stage extraction, and the other rare earth elements were scarcely ...
The removal of radioactive contaminants from aquifers is a matter of great concern. In this paper, coated copper-based nanoparticles (Cu-based NPs) were investigated as sorbent materials to remove uranium and thorium from low-level wastes, and especially from water, considering the influences of temperature, time, concentration, and pH.
According to a review study performed by Zhu et al. (2015), the removal of uranium and thorium from rare earths is typically achieved via solvent extraction or precipitation. In comparison to solvent extraction, precipitation takes advantage of different precipitation pH of thorium, uranium, and rare earths to achieve the separation.
Thorium is a radioactive element and is silver grey metal in its pure form. Its atomic weight is 90 and atomic mass unit is 232.0377. Melting point is 1750 °C, boiling temperature is 4785 °C and specific weight is 11.72 g/cm 3. Thorium has 13 radioactive isotopes from Th-223 to Th-235.
Increase of thorium concentration resulted in a decrease of scandium sorption by 26–65%. Tulsion CH 93 resin was chosen for Sc separation from uranium leach liquors. It was shown that 180 g L ...
separation of scandium from yttrium, rare earths, thorium, zirconium, uranium, and other elements by anion exchange chromatography in ammonium sulfate media
Semantic Scholar extracted view of "The heats of dissociation of the 8-quinolinol and substituted 8-quinolinol metal chelates of uranium (VI), thorium (IV) and scandium (III)" by G. R. Horton et al.
