· The applicability of a radon emanation system to radium determination in NORM materials after acidic sample dissolution has been investigated by means of a closed recirculating air loop radon emanation system. After system calibration with radium (226Ra) standard solutions and phosphogypsum samples, the method has been successfully
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The dissolution and mobilization of U appear to be correlated to the dissolution of iron (Fe)- or aluminum (Al)-bearing minerals, with EDTA being more effective (with R 2 ≥ 0.89)
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Transformation of Fe-bearing minerals from Dongsheng sandstone-type uranium deposit, Ordos Basin, north-central China: Implications for ore genesis Liang Yue1,2,3,†, Yangquan Jiao1,2,*, Mostafa Fayek3, Liqun Wu1,2, Hui Rong1,2, and Huili Xie4 1Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of
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:Wensui Luo, Wensui Luo, Baohua GuPublish Year:2011
Uranium minerals are mainly coffinite, which are in xenomorphic, euhedral and hypautomorphic granular. Conclusions The metamorphic acidic volcanic rocks and
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: Joe Hiess, Daniel J. Condon, Noah McLean, Stephen R. NobleDai et al. observed pitchblende and coffinite and other uranium-bearing minerals filled in the cavity of inertinite in coal. Meanwhile, the observation of vitrinite indicated that
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· The process has transported uranium from the source rocks to the sedimentary basin in oxygenated uranium-bearing fluids, which then precipitated into the ore-bearing layers [18,25,26,27,28,29]. Consequently, provenance plays a key role in the formation of sandstone-type uranium deposits, as it provides the necessary uranium
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The characterization of uranium-bearing minerals by different remote sensing technologies is a challenging task due to the implications for the exploration or the protection of uranium deposits. In nature, uranium-rich mineral ores are often associated with phosphates. Fossil bones may contain almost 1% of uranium as a result of interaction with ground water or
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is commercially extracted from uranium-bearing minerals such as uraninite. Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 is the only naturally occurring fissile isotope, which makes it widely used in nuclear power
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· Pyrite is an abundant mineral throughout the uranium-bearing Middle Jurassic Zhiluo Formation, northern Ordos Basin. Three different morphologies of pyrite are identified: framboidal,
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Manuscript 1215507 accepted for Science Magazine, 13th February 2012. One sentence summary: 238U/235U ratios for U-bearing accessory minerals from a diverse suite. of terrestrial rocks indicate a >5‰ range with an average zircon value of 238U/235U =
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is commercially extracted from uranium-bearing minerals such as uraninite. Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 is the only naturally occurring fissile isotope,
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· A small amount of them are irregular granular and fine columnar around clastic quartz, debris and other mineral particles. Coffinite is the main output form of ore-bearing sandstone uranium minerals in Lenghu region (Fig. 6 b, 6c, 6d, 6e and 6f). Download : Fig. 6
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· In recent years, the close relationship between uranium and Ti-Fe oxides in the sandstone-type uranium deposits has been extensively recognized. However, the altered characteristics of ilmenite and its relationship with uranium enrichment still remain unclear. With this paper based on heavy-mineral sorting of uranium ore selected from
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Uranium is a radioactive metal with a high specific gravity which was discovered in 1789 by Martin Klaproth. It was named after the planet Uranus. Occurrence: Uranium is concentrated on the surface of the Earth since its atoms don’t fit into the crystal structure of the minerals in the mantle. It is as common as tin, tungsten and molybdenumin
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· Uranium can concentrate in about 200 mineral species (Burns and Finch 1999).A restricted number of these U-bearing minerals may occur in significant concentrations under specific geological conditions to form an ore deposit (Frondel and Fleischer 1955; Frondel 1958; Dahlkamp 1993; Finch and Murakami 1999; Edwards and
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· This study examines the oxidation and coordination of lead (Pb) in the uranium (U) minerals uraninite (UO 2 ), coffinite (USiO 4 ), and brannerite (UTi 2 O 6 ), and minerals that have U as a minor constituent, zircon (ZrSiO 4) and titanite (CaTiSiO 5 ). The characterization of Pb was conducted through a combination of micro-synchrotron X-ray
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· Studies are undertaken to characterize the uranium and thorium minerals of south-east Madagascar. Seven selected uranothorianite bearing pyroxenites samples from old abandoned uranium quarries in
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The Primene JM-T is the most applied primary amine to extract thorium, and the Alamine 336 is a tertiary amine that has been employed for uranium extraction from the REE-bearing minerals [58,61,62]. The N 1923 , i.e.,
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In spite of this, the independent uranium minerals such as pitchblende, coffinite, and uranite and some other uranium-bearing minerals are usually common in the sandstone uranium deposit. In addition, the uranium content in the ore body is obviously related to the organic carbon and sulfur contents, indicating that uranium may exist in an organic state.
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Uranium is the second most common actinide metal and is found in many minerals. It is used in nuclear fuels and nuclear weapons. It also is a source for creating other actinides, especially plutonium and neptunium. Uranium is also used in the production of high energy X-rays. Uranium compounds are used in photographic toner and as a yellow tint
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AN INVESTIGATION OF THE MINERALOGY, PETROGRAPHY AND PALEOBOTANY OF URANIUM- BEARING SHALES AND LIGNITES. (SCOPE A--SHALES). QUARTERLY PROGRESS REPORT FOR PERIOD OF APRIL 1, 1954 TO JUNE 30, 1954
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· We report high-precision 238U/235U measurements for a suite of uranium-bearing minerals from 58 samples representing a diverse range of lithologies. This data set exhibits a range in 238U/235U
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· The bulk uranium extraction (U%) and U concentration data for the respective U-bearing minerals undergoing bio and chemical leaching at 30 C and 48 C are shown in Fig. 1. At 30 °C, the concentration of U in chemical leaching for uraninite, pitchblende and coffinite was 0.36, 0.43 and 0.33 g/l in 28 days, which equals an U
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Douzhashan granite is an important uranium-bearing granite in Miaoershan uranium ore field, northeastern Guangxi. Based on mineralogical study, chlorites can be classified as two types: ripidolite and diabantite, and the alteration of U-riched accessory minerals is closely correlated to the ripidolite which formed in higher temperature. The major hosted
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· The primary uranium minerals at Olympic Dam are uraninite, brannerite, and coffinite (Roberts and Hudson, 1983; Ehrig et al., 2012).Although these each naturally contain uranium, their ability to retain daughter isotopes varies. Colloform uraninite (Fig. 1) is considered late-stage and typically contains <7 wt% Pb (Macmillan et al., 2016a).
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· BSR can also lower the pH of groundwater, which can dissolve phosphate-rich minerals, such as apatite, leading to the release of P [60,61] and its enrichment in U-bearing minerals [62,63]. The pitchblende in the DL deposit has relatively high P 2 O 5 contents (0.07–1.64 wt.%) which are consistent with those of the sandstone-type U
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:UraniumGeology · Paragenesis, mineral chemical and microtextural studies of uranium bearing minerals in the brecciated albitites U-ores from the Kitongo shear zone, Poli region, northern Cameroon May 2022
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The Primene JM-T is the most applied primary amine to extract thorium, and the Alamine 336 is a tertiary amine that has been employed for uranium extraction from the REE-bearing minerals [58,61,62]. The N 1923 , i.e., (C n H 2 n +1 ) 2 CHNH 2 ( n = 9–11), is an alternative primary amine for this process, which has been employed in Baotou and
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· Uranium-bearing carbonate minerals have traditionally been considered a source for aqueous uranium in high-uranium environments associated with mining or other waste contamination. However, it is less understood whether uranium-bearing carbonate minerals can also play a role in uranium(VI) attenuation in aquifers, where
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The stability and mobility of uranium (U) is a concern following its reductive precipitation or immobilization by techniques such as bioremediation at contaminated sites. In this study, the influences of complexing organic ligands such as citrate and ethylenediaminetetraacetate (EDTA) on the mobilization of U were investigated in both batch and column flow
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Trituradora de piedra vendida por proveedores certificados, como trituradoras de mandíbula/cono/impacto/móvil, etc.
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