Chemical processes for recovery and purification of high …
A new processing scheme was developed using an anion exchange column run in a cycling mode with HNO3 media as the primary uranium purification process. …
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A new processing scheme was developed using an anion exchange column run in a cycling mode with HNO3 media as the primary uranium purification process. …
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uranium for ion exchange sites. Common examples are vanadate, molybdate, chloride, and nitrate. 2. Substances fouling ion exchange resins: compounds which form inert deposits or salts inside and/or on the surface of ion exchange resins. Such deposits are not removed by common treatment and require special care.
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The product was sonicated, washed, and dried for further use. CC/γ–MnO 2 is assembled into a Zn–MnO 2 cathode electrode, and the charge–discharge cycle is performed to obtain CC/γ–MnO 2 –OVs. The experimental process and formation mechanism are shown in Fig. S1-S3 (Supporting Information). 2.4. Synthesis of CC/γ …
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Uranium redox chromatographies were carried out in order to study uranium isotope separation based on chemical process. Hexavalent uranium ions were first adsorbed in the anion-exchange resin ...
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The feasibility of uranium removal using MnO 2 /OPC was tested by varying MnO 2 loading amount, pH, ionic strength, uranium initial concentration and …
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Ion exchange has traditionally been employed for water purification and the removal of metal contaminants from dilute waste streams. More recently, its use in removing trace metallic impurities ...
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The order of U(VI) removal in the UV/FA process was as follows: FA (HCOOH) > CA > L-TA > D-TA > AA > MA. ... membranes for uranium removal from aqueous solution. Prog Nucl Energy 94:93–100. Article CAS Google Scholar Reinoso-Maset E, Ly J (2016) Study of uranium(VI) and radium(II) sorption at trace level on …
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In the ion exchange process, ion exchange between two phases occurs. When a resin (a cross-linked polymer network consisting of electrostatically bound ions) meets a workable alternative metallic compounds of the same charge, ion exchange may occur, the extent of which can be determined by the ion concentration in the solution.
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Orange peel is an important resource in view of its low-cost and universal nature. A novel material (MnO 2 /orange peel carbon, MnO 2 /OPC) was yielded via a single step involving activation and in situ deposit. The feasibility of uranium removal using MnO 2 /OPC was tested by varying MnO 2 loading amount, pH, ionic strength, …
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Mine waters from gold and sometimes coal mining contain low but potentially harmful levels of uranium. These are not easily removed by conventional treatment technologies such as lime precipitation. The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be …
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Ion exchange has traditionally been employed for the purification of water and the removal of metal contaminants from dilute waste streams. More recently, its use in removing trace metallic impurities from hydrometallurgical process streams (with typical background metal concentrations of 50–100 g/L) has increased substantially.
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The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be state-of-the …
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An innovative MnO/Ti 3 C 2 MXene heterostructure, consisting of three-dimensional (3D) MnO nanosheet array directly assembled on two-dimensional (2D) Ti 3 C 2 MXene nanosheets, was synthesized via a simple hydrothermal-annealing strategy for uranium elimination. This unique 3D/2D heterostructure derived substantially high …
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Several novel processes have been developed for the recovery of uranium from wet-process phosphoric acid. Experimental measurements have been made on the batch extraction of uranium from phosphoric acid solutions using various chelating ion-exchange resins (RSPO, Diaion-CRP200, Diphonix, Purolite S940, Duolite ES467, and …
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The chloride (Cl) ion of the salt molecule is utilized by the anion exchange site, the sodium (Na) ion passes right through the resin bed and does not affect the process. Operational Guidelines The anion …
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Uranium leaching is the process by which the uranium is extracted from the raw ore by reacting the material with acid or base. Fig. 2 shows a general process flow for the uranium extraction process. Prior to the …
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The composite of ion exchangers (MnO 2 –ZrO 2) with polyacrylonitrile (MnO 2 –ZrO 2-PAN) was produced by dissolving the MnO 2 –ZrO 2 powder in dimethyl sulfoxide (DMSO) which involved 4% (w ...
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The use of ion exchange resins for the recovery of uranium from water sources in especially mine water circuits is commonplace and can be considered to be state-of-the …
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Our CIF ® (continuous ionic filtration) technology can be used to reduce or remove uranium, using a strong base anion exchange resin to target uranium ions. The process uses physical filtration alongside ion exchange, which has the added benefit of removing other impurities in the feed water, and delivering higher removal efficiencies than …
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Methods based on ion exchange resins using sulphuric acid and ammonium sulphate, controlled redox potential methodology using hydrogen peroxide for separation of traces of uranium from iron have been reported [6–8] As per the reported method uranium and iron mixture was loaded on the anion exchanger in 0.2N H 2 SO 4 …
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The water then proceeds to the uranium ion exchange section. The ion exchange configuration is shown in figure 8. There are two lead columns, one in operation and one on standby/regeneration. The aim is to reduce the uranium concentration below 20 µg/ℓ. The lead columns contain 100 ℓ of Lewatit MonoPlus S6368 resin and operate at 20
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The hydrated manganese dioxide (HMO) was synthesized by hydrothermal process using MnSO4 and KMnO4. The adsorption of HMO for Th(IV) and U(VI) were …
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The column could be used for at least four adsorption-desorption cycles using 0.1 mol·L −1 NaHCO 3 solution as the elution. After desorption and regeneration with deionized water, MOCZ could be reused to adsorb uranium (VI) at a comparable capacity. Compared to raw zeolite, MOCZ showed better capacity for uranium (VI) removal.
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The results reveal that the ion exchange process of ion exchange fibers is monolayer adsorption. In the Freundlich model, when the adsorption process was difficult, the equilibrium constant n is smaller than 0.5, and when the adsorption was easy to perform, the constant n was in the range of 2–10 . The result, that equilibrium constant …
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Mesoporous MnO2/SBA-15 composites were prepared via a simple route using KMnO4 and MnCl2 as Mn sources for the first time and were explored as a synergetic adsorbent …
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The BDST model was used to study the influence of bed height on the adsorption of uranium (VI). Desorption of uranium (VI) in the MOCZ column was …
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Uranium removal strategies primarily involve adsorption [7], chemical precipitation [20], ion exchange [21,22], membrane filtration [22,23], photocatalysis [24–28], and …
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Process flow schematic for radium removal by adsorption onto preformed MnO2 Alternatively, BaCl 2 may be ... Ion-Exchange Resins for Uranium Removal Type 1, macroporous, SBA Cl-1.0 resin, polystystrene-DVB ... Use preformed MnO2 or MnO2-coated filter media. MnO2 50-95% Adsorption
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Wang et al. synthesized α–MnO 2 @polydopamine nanocomposites (α–MnO 2 @PDAs) by coating α–MnO 2 nanowires with polydopamine for U(VI) removal from solution. [19]. [19]. Despite its benefits, nanosized MnO 2 –based particles are easy to agglomerate in the process of adsorption due to high surface energy [20].
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PDF | On Nov 13, 2019, S H Ahmed and others published Sulphuric acid leaching of uranium ore using MnO 2 as an oxidizing agent | Find, read and cite all the research you need on ResearchGate
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