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Adsorption of Uranium (VI) from Aqueous Solutions by Amino ...

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 ... 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. We have recently been studying the absorption of uranium on clay-like minerals (for example, montmorillonite ...

Efficient uranium immobilization on red clay with phosphates

Radioactivity in minerals are caused by the inclusion of naturally-occurring radioactive elements in the mineral's composition. The degree of radioactivity is dependent on the concentration and isotope present in the mineral. For the most part, minerals that contain potassium (K), uranium (U), and thorium (Th) are radioactive. Mar 03, 2017· Uranium deposits are geochemical anomalies and, as such, geochemistry must be an integral part of the exploration repertoire. Uranium itself is commonly used as a direct indicator of its deposits and this may be deflected using many different media. Amplifying the footprint of a deposit is the purpose of using geochemistry in exploration, thereby enabling detection at depth or traced near the ...

Geology of Uranium Deposits - World Nuclear Association

The higher levels of radiation in shale are caused by absorption of thorium by clay minerals, the potassium content of clay minerals (principally illite), and uranium fixed by associated organic material. ... The gamma-ray log was recorded for an Upper Pennsylvanian section of limestones and shales from an exploration well in Wabaunsee County ... Publication type: Report: Publication Subtype: USGS Numbered Series: Title: Clay minerals in two South Texas roll-type uranium deposits: Series title: Open-File Report

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

322 Ames, McGarrah, and Walker Clays and Clay Minerals Table 1. Uranium Kd Values. ~ Soil Kd (ml/g) 1 --River sediment (clay, CaCO3, organic matter) 39 colloids and interfaces Article Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals Victoria Tobilko 1, Larysa Spasonova 1,*, Iryna Kovalchuk 1,2,*, Borys Kornilovych 1 and Yurij Kholodko 1 1 National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", 37 Peremogy Av., 03056 Kyiv, Ukraine; [email protected](V.T.); …

Adsorption of Uranium on Clay Minerals | Nature

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 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 CO2, load of the sorbent, total amount of U present, and the presence of arsenate and other inorganic ligands such as sulfate, carbonate, and phosphate.

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

The primary uranium ore mineral is uraninite (UO 2) (previously known as pitchblende).A range of other uranium minerals can be found in various deposits. These include carnotite, tyuyamunite, torbernite and autunite. The davidite-brannerite-absite type uranium titanates, and the euxenite-fergusonite-samarskite group are other uranium minerals.. A large variety of secondary uranium minerals are ... Redox-driven dissolution of clay minerals by uranium under high pressure CO 2 conditions Yan Liu, Fubo Luan, William D. Burgos⁎ Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16801-1408, United States

Article about "uranium in carbonate sedimentary rocks"

Uranium is also adsorbed by clay minerals; excessively high uranium content in shales indicates source rock (Baker Atlas, 1985). Rider (1996) stated that "uranium behaves as an independent constituent: it is not chemically combined in the principal molecules of rocks like potassium, but it is loosely associated with secondary components. 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

Release and retention of uranium during glass corrosion ...

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 minerals are also associated ... to adsorption by specific clay minerals. The present study is concerned with the adsorption of uranium by montmorillonites under various conditions. Goldsztaub and Wey (1955) and Nuss and Wey (1956) examined the adsorption of uranyl ions from nitrate and acetate solutions in the pH range 2.25-4.4 by H- …

Thermodynamic Controls on the Microbial Reduction of Iron ...

Sep 07, 2017· 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. Early geometallurgical investigations identified that certain clay minerals could be deleterious to the efficiency of the uranium recovery process. Accurate calculation of clay mineralogy from resource assays proved too difficult due to chemical similarities between co-existing kaolinite, smectite and magnesium carbonate minerals.

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