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Separation of Radioactive Elements from Rare Earth …

either monazite or xenotime, to produce a hydroxide cake containing the REE, thorium, uranium, and some other impurities, reactions 1 and 2 [31,33,35]. This step eliminates the re-precipitation of thorium phosphate resulting in the formation of hydroxide forms of the REE and thorium, which can be separated in the second leaching step [34,37,38],

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Recovery of uranium, thorium and rare earth from industrial residues

Many process routes for the separation of thorium and uranium from rare earth mining products have been presented in literature; however, the treatment of the …

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Thorium, uranium and rare earth elements content in …

Purification of rare gases and the measurement of low residual impurity levels J. Vac. Sci. Technol. 11, 347 (1974); 10.1116/1.1318616 ... Thorium, Uranium and Rare Earth Elements Content In ...

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Release behavior uranium and thorium in soil from a

The purpose of this study was to systematically analyze the leaching process of radionuclides from a decommissioned uranium tailings. About 40% of all forms of uranium are harmful to the environment. The particle size of soil are the main factors affecting the leaching amount. Uranium and thorium have migrated again under the …

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Analytical applications of arsenazo III—II: Determination of thorium

The particular analytical utility of arsenazo III is its capacity for forming especially stable complexes with certain elements. This permits determinations to be carried out in strongly acid media (for quinquevalent and quadrivalent elements—Pa, Np IV Th, Zr, Hf, U IV —up to 10M HCl or H 2 SO 4), which ensures good reproducibility, ease of working, and little …

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Separation of thorium, uranium, and rare earths from a strip …

This study systematically evaluated the separation performance of thorium, uranium, and rare earths when coal and coal byproduct were utilized as a non-traditional feedstock for rare earth production. ... The hydrometallurgical process of lanthanides thus inevitably brings about large amounts of residual solution and slags containing ...

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THORIUM AS NUCLEAR FUEL: WHAT, HOW AND WHEN?

There is no advantage in using thorium instead of depleted uranium as a fertile fuel matrix in fast breeder reactor (FBR) systems owing to a higher fast fission rate for 238U and the fission contribution from residual 235U in this material. Thorium-232 in the blanket can be advantageous in a mixed reactor scenario. India has

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CN101012502A

The invention discloses a separating method of enriched uranium and thorium composition and rare earth, which comprises the following steps: leaching slag; extracting; separating extracting phase, residual phase and insoluble solid; obtaining the product. CN101012502A - Method for separating enriched uranium, thorium mixture and rare earth from ...

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Separation of thorium from radioactive rare-earth waste

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 …

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Uranium from Rare Earths deposits

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Radioactive Waste From Uranium Mining and Milling | US EPA

Uranium is a naturally-occurring radioactive element that has been mined and used for its chemical properties for more than a thousand years. It is now primarily used as fuel for nuclear reactors that make electricity. Uranium can be recovered in two ways: by conventional mining of the rock (ore), or by using strong chemicals to dissolve uranium …

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Mineralogical Properties of a Refractory Tantalum-Niobium Slag …

By micro-mineralogical analysis and roasting experiments, the effect of uranium-thorium leaching from a refractory tantalum-niobium slag is investigated. The uranium and thorium content in the slag is 2.26 × 10 3 mg/kg and 7.84 × 10 3 mg/kg, which have large recovery value. As the surface area and pore size of the slag are very small, the ...

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Geochemical and Mineralogical Characterization of Uranium and Thorium

Description. New geochemical and mineralogical data from research conducted under the IAEA coordinated research project entitled Geochemical and Mineralogical Characterization of Uranium and Thorium Deposits has resulted in a better understanding of the genesis of uranium and thorium mineralization. This publication presents a …

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Separation of thorium, uranium, and rare earths from a strip …

To evaluate the separation performance of thorium and uranium from rare earths while using coal and coal byproducts as a feedstock, experimental testing was performed in detail in this study. A synthetic solution was prepared following the elemental composition of a strip solution that was produced from a pilot-scale rare earth plant.

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Monazite's Potential Role in the Critical Minerals Industry

India's deposits are particularly unique, containing a far larger volume of thorium than uranium and accounting for roughly 25 percent of global thorium reserves. Other countries with mineral sand ...

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Separation of thorium from radioactive rare-earth waste

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 …

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Removal of thorium and uranium from leach solutions of

A continuous counter-current extraction for the selective recovery of thorium (Th) and uranium (U) from the Yen Phu (Vietnam) rare earth concentrate leach solutions was systematically studied.

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Selective Extraction of Thorium from Rare Earth Elements Using …

A new absorbent, surface-oxidized wrinkled mesoporous carbon (WMC-O), has been prepared for the selective extraction of thorium ions from rare earth ions. …

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(PDF) Extraction of some strategic elements from thorium uranium

The activity of the bioproducts from Aspergillus ficuum and Pseudomonas aeruginosa for extraction of thorium (Th 4+), uranium (UO 2 2+) and rare earth elements (REEs) from thorium uranium concentrate was studied. P. aeruginosa produce element-...

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PRODUCTION OF RARE EARTH ELEMENTS FROM …

finding in the residual tin deposits [3]. Monazite contains more LREEs compared to HREEs that are associated together with NORM (Thorium and Uranium) in significant concentration. Monazite concentrate commonly contains 24.0 – 29.0% of phosphate (P 2 O 5), 55.0 – 60.0% rare earth metal oxides, 5.0 – 10.0% thorium oxide (ThO 2

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PYROMETALLURGICAL PROCESSING (Technical Report)

Other extractants, rare earths, and alkaline earths were also studied in extractions with this alloy. Relative to the problem of separating small amounts of uranium from thorium, the phases which exist in magnesium-rich magnesium-thorium-uranium alloys were determined. ... Under these conditions the residual thorium content in the magnesium …

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Metals | Free Full-Text | Separation of Radioactive Elements from Rare

Rare earth elements (REE), originally found in various low-grade deposits in the form of different minerals, are associated with gangues that have similar physicochemical properties. However, the production of REE is attractive due to their numerous applications in advanced materials and new technologies. The presence of the radioactive elements, …

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RECOVERY OF THORIUM, URANIUM, AND RARE

The coefficients for extraction of rare earths from thorium- and uranium-barren monazite liquors with primary amines (0.2 M) were less than 1but high enough to allow >98% extraction in three to four ideal extraction stages. At high rare earth loadings the phosphate content of the extract was-5-

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What's the Difference Between Thorium and Uranium Nuclear …

A three-phase plan to use thorium in a nuclear reactor could produce energy with less waste and more efficiently use the fuel as well.

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Solved A U-238 nucleus (mass = 238 units) decays, | Chegg

A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 × 107 m/s, determine the recoil speed of the thorium nucleus. Could you please explain a bit in depth? Thanks!

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OR/17/001 The distribution of natural radioactivity in rocks

Like uranium, thorium is a relatively rare element, with an average abundance in the Earth's crust in the range of 6–10 ppm, ... uranium is transported away in solution whereas thorium precipitates locally and is concentrated in residual deposits resulting in geochemical separation (Adams and Weaver, 1958). It forms very few primary ...

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US4446116A

A process for recovering tantalum and/or niobium metal compounds from an ore containing one or more compounds of said metal or metals and further containing uranium, thorium, radium, titanium, and rare earth metals, wherein in a first step (I) the crushed ore is decomposed with a 0.5 to 6-fold amount of 70 to 96 percent sulfuric acid at ...

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CHAPTER 5. POTENTIAL FOR HUMAN EXPOSURE

The principal source of thorium is monazite (phosphate of rare earth metals, usually with thorium), a mineral produced as a byproduct of mineral sands mined for titanium and zirconium. Thorium compounds are extracted from monazite by acid and alkali treatment processes (Hedrick 1985).

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Thorium

Thorium is much more abundant in nature than uranium. Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233). ... The most common source of thorium is the rare earth phosphate mineral, …

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Rare earth elements: A review of applications

Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact ... quartz-veins and greisens which host primary REE deposits in addition to placers and residual weathering deposits derived from primary deposits. ... Small concentrations of thorium and uranium are making monazite …

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