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journal article: spectrophotometric determination of zirconium, uranium, thorium, and rare earths with arsenazo iii after extractions with thenoyltrifluoroacetone and tri-n-octylamine.
Zircon, scientifically known as zirconium silicate (ZrSiO4), is a naturally occurring mineral found in the Earth's crust. It is a dense, hard, and durable mineral that typically appears as small, reddish-brown to grayish crystals. Zircon contains the elements zirconium and silicon, along with trace amounts of other elements such as hafnium, …
A solvent extraction process is proposed to recover uranium and thorium from the crystal waste solutions of zirconium oxychloride. The extraction of iron from hydrochloride medium with P350, the extraction of uranium from hydrochloride with N235, and the extraction of thorium from the mixture solutions of nitric acid and the …
The mineral zircon (zirconium silicate) generally occurs in nature as a crystal. Most of the naturally occurring radioactive material (NORM) found in zircon is uranium and thorium, which is created …
The thoriumto-uranium ratios ranged from 1.5 to 20.9, with an average value of 5.1. Zirconium determinations on some of the bauxites gave values ranging from 0.02 to 0.65% zirconium, and averaging 0.09% zirconium. The thorium, uranium, and zirconium contents of the bauxites were related to the type of source rock.
In this work, the adsorption of uranium(VI) and thorium(IV) onto naturally occurring nanokaolinite from their aqueous solutions was studied for the first time. Nanokaolinite was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy …
All isotopes of thorium are radioactive and, as a consequence of it being fertile, thorium is important in the nuclear fuel cycle. The polymeric hydrolysis species that have been reported for thorium are somewhat different to those identified for zirconium and hafnium, although thorium does form the Th 4 (OH) 8 8+ species.
SOME THERMODYNAMIC ASPECTS OF MOLTEN SALTS: HALIDES OF URANIUM, ZIRCONIUM, THORIUM, AND CERIUM IN ALKALI HALIDE EUTECTICS * @article{Inman1960SOMETA, title={SOME THERMODYNAMIC ASPECTS OF MOLTEN SALTS: HALIDES OF URANIUM, ZIRCONIUM, THORIUM, AND CERIUM IN ALKALI …
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium (VI), thorium and rare earths with Arsenazo III after …
Thorium abundance is three times that of uranium in the Earth's crust (Adams and Richardson, 1960; Korna et al., 2014; Asokan et al., 2020), it is usually mined from monazite, a phosphate mineral, …
A rapid, simple and non-destructive method was developed for the determination of thorium, uranium by gamma ray spectrometry (high purity Ge detector) in thorium–uranium mixture. Using the calibration curves, thorium and uranium were analyzed in synthetic samples with RSD ~2 %. Inter element effect suggested that 583 …
abstract . The thorium oxide fuel cycle has been a viable technology option since the beginning of the nuclear era. By placing (Th, U)O2 in a zirconium matrix, the resulting cermet nuclear fuel properties create a strong negative void reactivity coefficient, which is especially appealing for boiling water reactor applications.
For example, zirconium, thorium, and uranium dusts have extremely low ignition temperatures [as low as 20°C (68°F)] and minimum ignition energies lower than any material classified in any of the Class I or Class II groups. (2) Group F.
The determination of the uranium, thorium and zirconium in mixtures by spectrophotometry using multivariate calibration involves constructing calibration and …
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium(VI), thorium and rare earths with Arsenazo III after systematic separation by extraction. First zirconium is extracted into a xylene solution of thenoyltrifluoroacetone (TTA) from about 4 M hydrochloric acid.
Two uranium–thorium–zirconium hydrides, (UTh 4 Zr 10)H 1.9 and (U 4 Th 2 Zr 9)H 1.5, have been fabricated and characterized. Fabrication involved arc melting of the constituent pure metals to form homogenous alloys, followed by hydriding at elevated temperatures in a hydrogen gas environment. The compounds were characterized by X …
DOI: 10.1016/0039-9140(61)80164-1 Corpus ID: 53332068; Analytical use of arsenazo III: Determination of thorium, zirconium, uranium and rare earth elements @article{Savvin1961AnalyticalUO, title={Analytical use of arsenazo III: Determination of thorium, zirconium, uranium and rare earth elements}, author={S. B. Savvin}, …
Soil samples are fused with sodium hydroxide at 600 °C in zirconium crucibles to enable complete dissolution of the sample. Uranium and thorium are separated on stacked TEVA and TRU extraction chromatographic resin cartridges, prior to isotopic measurements by alpha spectrometry on cerium fluoride microprecipitation …
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium(VI), thorium and rare earths with Arsenazo III after systematic separation by extraction. First zirconium is extracted into a xylene solution of thenoyltrifluoroacetone (TTA) from about 4M hydrochloric acid. Uranium(VI) is then …
The mobility of zirconium and identification of secondary Zr-bearing phases in bauxite from Pocos de Caldas, Minas Gerais, Brazil; a mass-balance and X-ray absorption spectroscopic study The Canadian Mineralogist
Uranium is incorporated in the crystal in trace amounts (zero to several thousand parts per million) by replacing zirconium, which has a similar ionic radius and equal valence (+4). Other important trace elements are hafnium (1 %), thorium, yttrium, phosphorus, and the heavy rare earth elements.
O.N. Carlson, Some Studies on the Uranium-Thorium-Zirconium Ternary Alloy System, USAEC Report AECU-3206, 1950. G.G. Bentle, Study of the Thorium Alloy Systems, Proceedings of the UN International Conference on the Peaceful Uses of Atomic Energy (Geneva), 1958, Vol 6, p 61-156 J.R. Murray, The Uranium-Thorium System …
In nature, uranium, thorium and zirconium are invariably associated with lanthanides and their mutual separation is of vital signi fi cance. Most of the natural sources of
radioactive material) is mostly used for minerals and other materials with above-average uranium and thorium concentrations. Importantly, the radioactive nature of zircon has not changed, but the way in ... Zirconium dioxide 37 10 000 -100 000 Zirconium dioxide Y-doped 6 7 100 -1000
The combination of the thorium fuel cycle and zirconium matrix cermets has enabled a new core design for a simplified boiling water reactor (SBWR). Core …
Uranium is incorporated in the crystal in trace amounts (zero to several thousand parts per million) by replacing zirconium, which has a similar ionic radius and equal valence (+4). Other important trace …
machining techniques and procedures for uranium, graphite, titanium, zirconium, thorium, tantalum, beryllium, bismuth, lithium, and stellite Technical Report · Tue Nov 04 00:00:00 EST 1952 OSTI ID: 1003990
Uranium and thorium are naturally occurring, radioactive heavy metals with unusual properties. The energy generated by the natural breakdown of radioactive elements is immense and can be used in nuclear reactors. ... In these deposits, thorium is usually associated with other commodities such as rare earths, zirconium, niobium, tantalum …
Eudialyte-group minerals are of scientific interest as important concentrators of rare elements (mainly Zr and REE) in agpaitic alkaline rocks and a potential source of REE, Zr, Hf, Nb, and Ta for industrial use. Extraction of uranium(VI), thorium(IV), zirconium(IV), hafnium(IV), titanium(IV), and scandium(III) by a binary extractant based …
It is well known that sulfuric acid is the most common acid used for leaching and decomposition of ores and concentrates. One prime example, monazite ore, is a yellow to reddish-brown natural phosphate of the rare earths, mainly the cerium and lanthanum elements, usually with some uranium and thorium.