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Removal of thorium and uranium from aqueous solution by ...

Jul 03, 2019· 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 investigated by batch static adsorption experiments. The HMO and MnO2 were characterized by FT-IR, XRD and SEM. At the same time, the adsorption mechanism is discussed. The adsorption process was in line with the pseudo …

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Physical Chemistry of Metallurgical Processes

lium, uranium, thorium, titanium, zirconium, aluminum, and magnesium are pre-sented in Appendixes A.1–A.12, respectively. Appendixes B.1 and B.2 list the salient features of important sponge ironmaking and direct smelting reduction processes. Appendixes C.1 and C.2 provide the values for recommended physical constants and conversion factors.

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EXPLOSIVE CHARACTERISTICS OF TITANIUM, ZIRCONIUM, …

EXPLOSIVE CHARACTERISTICS OF TITANIUM, ZIRCONIUM, THORIUM, URANIUM AND THEIR HYDRIDES . BY IRVING HARTMANN, JOHN NAGY. AND MURRAY JACOBSOM »#««*#*«* Report of Investlgatioas 4835 QtOS^ UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman, Secretary BUREAU OF MINES J. J. Forbes, Director Work on manuscript completed September 1951.

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Recovery of uranium and thorium from zirconium oxychloride ...

Sep 03, 2011· A solvent extraction process is proposed to recover uranium and thorium from the crystal waste solutions of zirconium oxychloride. The extraction of iron from hydrochloride medium with P350, the extraction of uranium from hydrochloride with N235, and the extraction of thorium from the mixture solutions of nitric acid and the hydrochloric acid ...

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PROCESS FOR THE SEPARATION AND PURIFICATION OF …

Interferences are not caused by 1 g of uranium(VI), iron(II), aluminum, zinc, tin, or magnesium, 0.1 g of titanium or sulfate, and 1 mg of phosphate ions. Iron(III) must be reduced with tin(II) chloride. Interference from 0.1 g of thorium can be overcome by addition of about 5 mg of sulfate ion.

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Anion Exchange Separation of Zirconium, Titanium, Niobium ...

Separation of Titanium from Rare Earths, Beryllium, Niobium, Iron, Aluminum, Thorium, Magnesium, Manganese, and Other Elements by Cation Exchange Chromatography.. Analytical Chemistry 1963, …

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Fluorination of Rare Earth, Thorium and Uranium Oxides and ...

Monazite is a light rare earth phosphate which is difficult to process when using conventional chemical processes. It is considered to be one of the most important commercial sources of thorium and lanthanides. Using conventional chemicals to process monazite have caused severe environmental damage as has been demonstrated in the Baotou region, China.

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Separation of uranium and thorium from rare earths for ...

Jun 01, 2015· The extraction and separation of uranium, thorium and rare earths in HNO 3 solution with TBP will be discussed in the subsequent section. At present, all residues containing thorium are stored as radioactive wastes without further processing (Yu and Zhang, 1982, Su, 2014). 3. Uranium and thorium separation in some rare earth practices outside China

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Separation Of Vanadium And Tungsten From A Sodium

Analytical Methods for Certain Metals Including Cerium, Thorium, Molybdenum, Tungsten, Radium, Uranium, Vanadium, Titanium and Zirconium Chemical Analysis INIS Atomindex The Analytical Chemistry of Cobalt I. a Separation of Arsenic, Antimony and Vanadium from Tungsten; II. on the Complex Bismuthico Tungstates: A Thesis (Classic Reprint)

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Rapid fusion method for the determination of refractory ...

Feb 14, 2015· 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 sources.

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US6210461B1 - Continuous production of titanium, uranium ...

This invention provides improved production, continuous or batch, especially of metals which have been produced by versions of the Kroll and Ames processses. This list includes titanium, zirconium, hafnium, vanadium, niobium, tantalum, rhenium, molybdenum, tungsten, and uranium. It also offers a process for growing particular shapes of metallic crystals, e.g., needlelike.

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Determination of Uranium, Thorium, Plutonium, Americium ...

Jul 01, 1997· The determination of activities of thorium, uranium, plutonium, americium, and curium at very low levels has been performed by a new α liquid scintillation system (PERALS, name registered to Ordela, Inc.). The limit of detection has been determined for these nuclides with calculated values often lower than those obtained by other methods, like ICPMS/HP/Mistral, time-resolved laser-induced ...

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clean separation of one or more micrograms of thorium from at least 30 fflg of such elements as rare earths, zirconium, titanium, niobium, tantalum, scandium, and Iron with one iodate precipitation to allow an accurate determination of thorium with the thoron^mesotartaric acid system. The

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Selective separation of thorium from rare earths and ...

Jul 15, 2020· Separation of thorium and uranium in nitric acid solution using silica based anion exchange resin J. Chromatogr. A, 1466 ( 2016 ), pp. 37 - 41, 10.1016/j.chroma.2016.09.010

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Separation of Thorium by Anion Exchange | Analytical Chemistry

Separation of Thorium from Zirconium Carbide Waste by Liquid–Liquid Extraction Using Tri-n-octylamine Solvent after Selective Acid Leaching. Industrial & Engineering Chemistry Research 2020, 59 (47), 20866-20876.

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Analytical quality control in the production of

separation and preconcentration. Analysis of zircon The zircon concentrate for the production of ZrO2 is available from the beach sand beneficiation plants at Kerala. As a certain amount of contamination with titanium, thorium and silicon minerals may be expected in …

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SOME DATE ON THE ANALYSIS OF URANIUM, THORIUM, AND ...

@article{osti_4819329, title = {SOME DATE ON THE ANALYSIS OF URANIUM, THORIUM, AND ZIRCONIUM}, author = {Almassy, G and Oerdoegh, M and Schneer, A}, abstractNote = {Considering the physicochemical conditions for tributyl phosphate (TBP) uranium extraction, an optimum nitrate concentration of the aqueous phase is found, in which uranium separation by single extraction …

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(PDF) Separation and spectrophotometric determination of ...

Separation and spectrophotometric determination of very low levels of Cr(VI) in water samples by novel pyridine-functionalized mesoporous silica. ... Supercritical fluid extraction of uranium and thorium from solid matrices. By ANKITA PAL. A Review on Nuclear Forensic Methodology for Analysis of Nuclear Material of Unknown Origin.

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Spectrophotometric determination of zirconium, uranium ...

A method is described for the spectrophotometric determination of microgram amounts of zirconium, uranium(VI), thorium and rare earths with Arsenazo III after systematic separation by extraction. First zirconium is extracted into a xylene solution of thenoyltrifluoroacetone …

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Tantalite Beneficiation through Sequential Separation of ...

Acid Leaching Using H2SO4 on the other Hand Removed a Large Portion of Thorium and Uranium in these Samples. Analytical Results Indicated that 66(1) and 54.7(5)% of Total Fe and Ti Respectively, and ~ 2% each of Nb2O5 and Ta2O5 were Removed from Ferrotantalite Using the Magnetic Separation Method, while only 9.0(1) and 8.61(4)% of Total Fe2O3 ...

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Study on uranium recovery from tungsten residue ...

Feb 14, 2015· Alina A, Born HJ, Stärk H (1972) Separation of uranium, thorium and protactinium by extraction with tertiary amines from mixed media. Radiochim Acta 17:49–51. Google Scholar 42. Schrötterová D, Nekovář P, Mrnka M (1992) Extractive separation of uranium and zirconium sulfates by amines. Solvent Extr Ion Exch 10:231–241

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Ion-exchange separation and spectrophotometric ...

Aug 01, 1974· In order to establish the effectiveness of the separation of thorium, zirconium and uranium(VI) from each other, as well as from common rock matrices, a mock solution containing sodium, potassium, magnesium, calcium, aluminum, titanium(IV) and iron(III) was prepared, to which known amounts of thorium, zirconium and uranium(VI) were added; this ...

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TENORM: Hard Rock Metal Mining | Radiation Protection | US EPA

May 19, 2021· Titanium Ore. Uranium, thorium, and radium commonly occur in titanium ore, and monazite is found in sands from which the titanium is extracted. When titanium is extracted from the Earth, the related materials, such as mineral sludges, dusts and sands from the titanium extraction process, may contain radioactivity.

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TENORM: Gold, Silver, Zircon and Titanium Mining Wastes ...

Nov 02, 2016· The uranium and thorium atoms and their decay products are bound within the zircon crystal structure, substituting for a small number of zirconium atoms. In most other uranium-containing minerals, including uranium ores, the uranium atoms are not bound within the crystalline matrix but form part of the cementing material between the grains. The ...

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Recovery of uranium and thorium from zirconium oxychloride ...

Sep 03, 2011· 10%· From Figs. 1 and 2, the optimum separation conditions for Fe (III) from synthetic solutions containing the given metal ions are recognized as 30% P350 and 4.5 to 6.0 M HCl. Extraction of uranium from hydrochloric acid medium with N235. The phase volume ratio O/A and the 2-octanol concentration in the organic solutions have been kept at 1:1 and 10% (v/v), respectively.

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US8795611B2 - Method for purifying the uranium from a ...

A method with which uranium from a natural uranium concentrate may be purified, including a) extracting the uranium present as uranyl nitrate in an aqueous phase A1 resulting from the dissolution of the natural uranium concentrate in nitric acid, by means of an organic phase which contains an extractant in an organic diluent; b) washing the organic phase obtained at the end of step a), with an ...

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Separation of Thorium from Zirconium Carbide Waste by ...

Separation of thorium from zirconium carbide waste is reported. The waste typically contains zirconium, yttrium, uranium, and thorium, along with other impurities including rare earth elements (REEs), iron, calcium, aluminum, hafnium, and titanium. The first step in the separation was selective leaching of zirconium, uranium, and most other impurities with HNO3–HF, leaving thorium and …

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Separation of Uranium from Liquid Media - DuPont

Groundwater Remediation . Uranium is a natural element found in groundwater throughout the world and regulated in some countries. Uranium is usually present as the monovalent uranyl ionic complex (U 3 O 8-) at very low levels in groundwater and thus the most cost effective treatment is to remove the uranium with a highly selective ion exchange resin and then dispose of the uranium-loaded resin.

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