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clay minerals uranium

Geochemistry of clay minerals for uranium exploration in ...

Clay mineralogy studies of ore rocks versus barren rocks in the Grants mineral belt, New Mexico, show that some combination of chlorite (rosette form), illite, mixed-layer illite-montmorillonite, (±Mg-montmorillonite) are penecontemporaneous with uranium minerals in trend ore; these same clay minerals plus kaolinite are related to the roll-type ore near the main redox front of the …DISSOLUTION OF CLAY MINERALS AND REDOX …M) was used to measure acid-promoted clay mineral dissolution in a stronger acid. Control reactors were maintained under ambient pressure conditions (P T = 1.0 bar, N 2:H 2 = 95:5%). For three types of unaltered clay minerals in three different brines, very little dissolution occurred, showing these clay minerals are stable under high pressure CO 2

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INTERACTIONS BETWEEN URANIUM OXIDES AND THE …

2019-9-13 · INTERACTIONS BETWEEN URANIUM OXIDES AND THE CLAY MINERALS INTRODUCTION Uranium is ubiquitous in nature, originating primarily in igneous rocks, but subsequently ending up in soils, coal, and a variety of sedimentary rocks such as shales, sandstones, and phosphate rocks. As an incompatible element, uranium in magma is …Sorption of uranium(VI) on clays and clay minerals ...Request PDF | Sorption of uranium(VI) on clays and clay minerals | A review, with 28 refs., of the literature data concerning the adsorption of U from aq. solns. on natural and modified clays at ...

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INTERACTIONS BETWEEN URANIUM OXIDES AND THE …

2019-9-13 · INTERACTIONS BETWEEN URANIUM OXIDES AND THE CLAY MINERALS INTRODUCTION Uranium is ubiquitous in nature, originating primarily in igneous rocks, but subsequently ending up in soils, coal, and a variety of sedimentary rocks such as shales, sandstones, and phosphate rocks. As an incompatible element, uranium in magma is …PROGRESS IN URANIUM ADSORPTION BY CLAY …Clay mineral adsorption uranium mainly exists in sandstone-type uranium deposits. By comparing ores which contain more clay mineral with ores which contain fewer or less, it is found that the ores which contain moreclay minerals have the higheruranium content. Theadsorption capacityof clay minerals of uranium is different. Through the study to the three minerals, it comes a co …

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Clay Minerals and Metal Oxides Can Change How Uranium ...

Clay Minerals and Metal Oxides Can Change How Uranium Travels Through Sediments The molecular form of reduced uranium in the subsurface is affected by common sediment constituents. The mobility of uranium in the subsurface depends strongly on its oxidation state, with U(IV) being significantly less soluble than U(VI). However, solubility also depends on the …Sorption of uranium(VI) on clays and clay minerals ...Request PDF | Sorption of uranium(VI) on clays and clay minerals | A review, with 28 refs., of the literature data concerning the adsorption of U from aq. solns. on natural and modified clays at ...

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Clay minerals in sandstone uranium deposits : radwaste ...

Clay minerals play an important role in the genesis of uranium deposits in sandstones. They incorporate the rare earths (REE), U, Sb, Th, Cs, Rb, Sr, Y, Ba, and even small amounts of chalcophiles. These minerals possess analog elements for талу of the radwaste fission products as well as actinides and some actinide daughters.Clay mineralogy and isotope geochemistry of the …However, the delineation of clay rich zones is important, since clay minerals in alteration zones surrounding uranium deposits are reported to constitute natural geological barriers to uranium ...

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Clay minerals in sandstone uranium deposits : radwaste ...

Clay minerals play an important role in the genesis of uranium deposits in sandstones. They incorporate the rare earths (REE), U, Sb, Th, Cs, Rb, Sr, Y, Ba, and even small amounts of chalcophiles. These minerals possess analog elements for талу of the radwaste fission products as well as actinides and some actinide daughters. In sandstone uranium deposits, clay …PROGRESS IN URANIUM ADSORPTION BY CLAY …Clay mineral adsorption uranium mainly exists in sandstone-type uranium deposits. By comparing ores which contain more clay mineral with ores which contain fewer or less, it is found that the ores which contain moreclay minerals have the higheruranium content. Theadsorption capacityof clay minerals of uranium is different. Through the study to the three minerals, it comes a co …

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(PDF) Sorption of uranium(VI) at the clay mineral-water ...

Uranium adsorption onto clay minerals is pH-dependent, being higher at neutral to high pH but lower at acidic pH (Bachmaf & Merkel, 2011). This adsorption behavior explains the lower concentration ...Geochemistry of clay minerals for uranium exploration in ...Clay mineralogy studies of ore rocks versus barren rocks in the Grants mineral belt, New Mexico, show that some combination of chlorite (rosette form), illite, mixed-layer illite-montmorillonite, (±Mg-montmorillonite) are penecontemporaneous with uranium minerals in trend ore; these same clay minerals plus kaolinite are related to the roll-type ore near the main redox front of the …

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Surrogate Model for Multi-Component Diffusion of …

2021-1-15 · In the literature, sorption of uranium on Opalinus Clay is commonly modeled using only the clay minerals illite and montmorillonite [32,33,34,35]. We followed that approach and assessed the effect of various mineral compositions on the resulting diffusion length (Scenario MC 2 …Minerals | Special Issue : Geology of Uranium Deposits2021-5-21 · A significant amount of uranium was associated with pyrites, clay minerals and carbonaceous debris organic matter, either coexisted with hydrocarbon fluids. There are at least two stages mineralization events, stage I is related to sedimentary organic matter (syngenetic pre-enrichment stage), and stage II is related to mobile hydrocarbon fluids ...

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Sorption of uranium(VI) at the clay mineral–water ...

2010-10-11 · Batch experiments were conducted to study the sorption of uranium on selected clay minerals (KGa-1b and KGa-2 reference kaolinite, SWy-2 and STx-1b reference montmorillonite, and IBECO natural bentonite) as a function of pH (4–9) and 0.001, 0.01, and 0.025 M NaCl in equilibrium with the CO2 partial pressure of the atmosphere. Uranium concentrations were …INTERACTIONS BETWEEN URANIUM OXIDES AND THE …2019-9-13 · INTERACTIONS BETWEEN URANIUM OXIDES AND THE CLAY MINERALS INTRODUCTION Uranium is ubiquitous in nature, originating primarily in igneous rocks, but subsequently ending up in soils, coal, and a variety of sedimentary rocks such as shales, sandstones, and phosphate rocks. As an incompatible element, uranium in magma is …

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

2022-2-12 · Most of the uranium and thorium will probably reside within resistant trace detrital minerals such as zircon, monazite, apatite and xenotime, although some may also be associated with disseminated iron oxides and sorbed on clay minerals (cf. …Characteristics of sandstone-type uranium mineralization …2021-12-23 · The uranium deposits in the northeastern Ordos Basin are closely related to clay minerals and coal seam both in space and genesis, and the generation of kaolinite in the Zhiluo Formation is controlled by the coal seam of the Yan''an Formation. Through ...

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Redox-driven dissolution of clay minerals by uranium …

2014-9-15 · Clay minerals dissolve in strong acid, such as > 1 M H 2 SO 4 or HCl, under high temperature (70 to 95 °C) for several hours (Okada et al., 2006, Steudel et al., 2009). In addition to acid-promoted dissolution, Fe(III)-rich clay minerals are subject to redox-promoted dissolution.Clay minerals in two south Texas roll-type uranium ...2010-11-29 · The abundance and distribution of clay minerals across uranium deposits, therefore, may reflect, in part, chemical conditions of uranium deposition. Clay-mineral assemblages associated with uranium deposits have been most thoroughly studied in samples from the Jurassic Morrison Formation in the area

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Synchrotron X-radiation Study of Illitic Clays from the ...

2019-1-4 · the clay matrix surrounding these minerals. Analyses revealed that the clay matrix could contain from 3 to 16% U0 2 (Percival, 1989). However, it was difficult to determine whether U is present as isomorphic substitution in the clay mineral lattice, adsorbed onto the illite surface or within the interlayer, or if U occurs as micro-disseminated ...Minerals | Special Issue : Geology of Uranium Deposits2021-5-21 · A significant amount of uranium was associated with pyrites, clay minerals and carbonaceous debris organic matter, either coexisted with hydrocarbon fluids. There are at least two stages mineralization events, stage I is related to sedimentary organic matter (syngenetic pre-enrichment stage), and stage II is related to mobile hydrocarbon fluids ...

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Redox-driven dissolution of clay minerals by uranium …

Redox-driven dissolution of clay minerals by uranium under high ... Increased acidity of brine due to CO 2 injection could lead to mineral dissolution of cap rock and well seals and mobilization of contaminants (e.g., U, Pb, As). In this study we examined the dissolution of nontronite NAu-2, an Fe(III)-rich clay mineral, and partially ...Fe and Mg isotopic compositions of clay minerals from …2020-3-24 · Fe and Mg isotopic compositions of clay minerals from the environs of the McArthur River uranium deposit, Saskatchewan, Canada by Andrés Acevedo A thesis submitted to the Graduate Program in the ... River uranium deposit Zone 4 in the Athabasca Basin are the main focus of this project. Iron

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Determination of Uranium, Thorium and Potassium ...

2021-10-3 · Therefor the clay type Montmorillonite Illite have less uranium concentration (average = 1.48 ppm) while the Montmorillonite clay has higher values of uranium contents (average = 2.035 ppm) in the studied Hawaz sandstone formation in the concession NC115 Murzuq basin. Table (2): Clay types of Hawaz intervals and average of the uraniumGamma log - SEG Wiki2018-1-4 · Unlike Potassium and Thorium, Uranium is not associated with clay minerals and thus occurs irregularly in shales. To summarize, a shale is typically associated with a high radioactivity made up primarily by Thorium, to a lesser …

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Clay Minerals and Metal Oxides Change How Uranium Travels ...

We have recently been studying the absorption of uranium on clay-like minerals (for example, montmorillonite, vermiculite and halloysite) to investigate …Geochemistry of clay minerals for uranium exploration in ...Clay mineralogy studies of ore rocks versus barren rocks in the Grants mineral belt, New Mexico, show that some combination of chlorite (rosette form), illite, mixed-layer illite-montmorillonite, (±Mg-montmorillonite) are penecontemporaneous with uranium minerals in trend ore; these same clay minerals plus kaolinite are related to the roll-type ore near the main redox front of the …

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Adsorption of Uranium on Clay Minerals

Adsorption of Uranium on Clay Minerals. IN the conventional sulphuric acid leaching of low-grade uranium ores, using 50-200 1b. acid per ton of ore, considerable amounts of uranium may remain in the leach residues, especially with secondary ores where the uranium is in the hexavalent form and should be readily soluble.Geochemistry of clay minerals for uranium exploration in ...Clay mineralogy studies of ore rocks versus barren rocks in the Grants mineral belt, New Mexico, show that some combination of chlorite (rosette form), illite, mixed-layer illite-montmorillonite, (±Mg-montmorillonite) are penecontemporaneous with uranium minerals in trend ore; these same clay minerals plus kaolinite are related to the roll-type ore near the main redox front of the …

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Clay minerals in sandstone uranium deposits : radwaste ...

Clay minerals play an important role in the genesis of uranium deposits in sandstones. They incorporate the rare earths (REE), U, Sb, Th, Cs, Rb, Sr, Y, Ba, and even small amounts of chalcophiles. These minerals possess analog elements for талу of the radwaste fission products as well as actinides and some actinide daughters.Uranium migration through the Swiss Opalinus Clay …2021-11-9 · veloping the clay minerals and thus can potentially influence the diffusive transport of uranium. Hence, two identical sce-narios only differing in the value for the stability constant of the Ca2UO2 3/3 complex were applied in order to quan-tify and compare the migration lengths of uranium on the

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Clay Alteration Associated with Proterozoic Unconformity ...

2005-5-1 · Clay minerals associated with the unconformity-type uranium deposits of the East Alligator Rivers uranium field have been used to determine the spatial distribution of hydrothermal alteration and the conditions of uranium deposition within the altered basement underlying the Kombolgie unconformity. Alteration develops a similar pattern at ...Fe and Mg isotopic compositions of clay minerals from …2020-3-24 · Fe and Mg isotopic compositions of clay minerals from the environs of the McArthur River uranium deposit, Saskatchewan, Canada by Andrés Acevedo A thesis submitted to the Graduate Program in the ... River uranium deposit Zone 4 in the Athabasca Basin are the main focus of this project. Iron

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Uranium Sorption on Clay Minerals

Uranium(VI) removal by clay minerals is influenced by a large number of factors including: type of clay mineral, pH, ionic strength, partial pressure of CO 2, load of the sorbent, total amount of U present, and the presence of arsenate and other inorganic ligands such as sulfate, carbonate, and phosphate. Both sulfate and carbonate reduced uranium(PDF) Sorption of uranium(VI) at the clay mineral-water ...Uranium adsorption onto clay minerals is pH-dependent, being higher at neutral to high pH but lower at acidic pH (Bachmaf & Merkel, 2011). This adsorption behavior explains the lower concentration ...

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Retrograde alteration of clay minerals in uranium deposits ...

1991-4-5 · The development of late-stage kaolinite, lowering of δD-values in all clay minerals in fractures near the ore zones, loss of K 2 O and decreasing K Ar ages with increasing water contents in illite are indicative of retrograde alteration of clay minerals due to influx of late-stage meteoric water in the Athabasca Basin. Recent proposals that ...Sorption of uranium(VI) at the clay mineral–water ...2010-10-11 · Batch experiments were conducted to study the sorption of uranium on selected clay minerals (KGa-1b and KGa-2 reference kaolinite, SWy-2 and STx-1b reference montmorillonite, and IBECO natural bentonite) as a function of pH (4–9) and 0.001, 0.01, and 0.025 M NaCl in equilibrium with the CO2 partial pressure of the atmosphere. Uranium concentrations were …

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Adsorption of Uranium on Clay Minerals

Adsorption of Uranium on Clay Minerals. IN the conventional sulphuric acid leaching of low-grade uranium ores, using 50-200 1b. acid per ton of ore, considerable amounts of uranium may remain in the leach residues, especially with secondary ores where the uranium is in the hexavalent form and should be readily soluble.Sorption of uranium(VI) on clays and clay minerals ...Request PDF | Sorption of uranium(VI) on clays and clay minerals | A review, with 28 refs., of the literature data concerning the adsorption of U from aq. solns. on natural and modified clays at ...

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Uranium Sorption on Clay Minerals

Uranium(VI) removal by clay minerals is influenced by a large number of factors including: type of clay mineral, pH, ionic strength, partial pressure of CO 2, load of the sorbent, total amount of U present, and the presence of arsenate and other inorganic ligands such as sulfate, carbonate, and phosphate. Both sulfate and carbonate reduced uraniumUranium speciation in 0.01 M NaCl, RU = 100 lg L-1, Pco 2 ...Batch experiments were conducted to study the sorption of uranium on selected clay minerals (KGa-1b and KGa-2 reference kaolinite, SWy-2 and STx-1b reference montmorillonite, and IBECO natural ...

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Clay Minerals and Metal Oxides Change How Uranium …

2017-9-7 · The threshold uranium(IV) surface coverage above which uraninite formation begins was determined to be significantly lower for montmorillonite than for iron or titanium oxides, suggesting that metal oxides may play a more important role than clay minerals in stabilizing the non-uraninite species observed in natural sediments.Clay Minerals and Metal Oxides Can Change How Uranium ...Clay Minerals and Metal Oxides Can Change How Uranium Travels Through Sediments The molecular form of reduced uranium in the subsurface is affected by common sediment constituents. The mobility of uranium in the subsurface depends strongly on its oxidation state, with U(IV) being significantly less soluble than U(VI). However, solubility also depends on the …

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