A compilation of constitution diagrams of uranium and thorium alloys is presented. The transformation and melting temperatures of the base metal are discussed, followed by the various alloys in alphabetical order. References are included on each alloy. ... AN EVALUATION OF THE PROPERTIES AND BEHAVIOR OF ZIRCONIUM-URANIUM …
Thorium is a naturally occurring, slightly radioactive element. It is widely distributed in nature with an average concentration of 10.5 ppm Th in the upper earth's crust. In general, thorium occurs in relatively small number in Th-enriched minerals: thorite, thorianite, monazite, bastnaesite, and thorogummite. However, the main world …
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 …
Hartmann, I, Nagy, J, and Jacobson, M. EXPLOSIVE CHARACTERISTICS OF TITANIUM, ZIRCONIUM, THORIUM, URANIUM AND THEIR HYDRIDES.United States: N. p., 1951. Web. doi:10. ...
In nature, uranium, thorium and zirconium are invariably associated with lanthanides and their mutual separation is of vital significance. Most of the natural sources of these elements are lean and elegant separation schemes are required to meet the stringent demands of purity and recovery.
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 …
Zirconium is found along the Kerala coast and in alluvial rocks of Ranchi and Hazaribagh districts of Jharkhand. Uranium. Uranium is a silvery-gray metallic radioactive chemical element. It is only naturally …
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.
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}, …
The method permits the determination of uranium when its concentration in the solution to be analysed is 0-002 /^g/ml and above.12 V0^+ is determined photometrically at pH 1-5-3-5 and U^ in 6-9MHC1.1.2 Zirconium Zirconium is determined under approximately the same conditions as thorium in 6-9M HC1.2 If a high sensitivity is not required, the ...
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
The determination of the uranium, thorium and zirconium in mixtures by spectrophotometry using multivariate calibration involves constructing calibration and …
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 …
Zirconium, chemical element, metal of Group 4 (IVb) of the periodic table, used as a structural material for nuclear reactors. ... The most important use of zirconium is in nuclear reactors for cladding fuel rods, for alloying with uranium, ... Zirconium reduces such refractory crucible materials as the oxides of magnesium, beryllium, and thorium.
A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium (VI), thorium and rare earths with Arsenazo III after …
Fig. 1 shows the absorption spectra in aqueous solution of the individual uranium, thorium, and zirconium complexes and Arsenazo III at 0.1 mol L −1 HCl. As this figure shows, there is a clear overlapping of the three spectra. This prevents the simultaneous determination of the uranium, thorium, and zirconium by direct UV–vis …
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.
Thorium and its compounds have been produced primarily as a by-product of the recovery of titanium, zirconium, tin, and rare earths from monazite, which contains 6–8.5 wt% thorium oxide. Only a small portion of the thorium produced is consumed. ... Uranium, thorium, and all other elements heavier than nickel result from the sudden …
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
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
journal article: spectrophotometric determination of zirconium, uranium, thorium, and rare earths with arsenazo iii after extractions with thenoyltrifluoroacetone and tri-n-octylamine.
Two uranium–thorium–zirconium hydride fuels of the overall chemical formulae (UTh 4 Zr 10)H 1.9 and (U 4 Th 2 Zr 9)H 1.5 have been fabricated in order to …
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.
Pure zirconium metal prepared by Van Arkel process and pure thorium metal in the form of pressed powder were obtained from Uranium Extraction Division (UED), …
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.
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 …
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 …
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
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 …
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