• Mass‐transfer mechanisms for Wiley Online Library

    Jei-Kwon Moon Chong-Hun Jung Eil-Hee Lee Byung-Chul Lee Adsorptive separation of rhenium and rhodium in nitric acid solution using a column packed with an extractant impregnated resin Korean Journal of Chemical Engineering 10.1007/s 23 6 () (2006).

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  • Extraction of rhenium (VII) by tetraoctylammonium bromide

    Jun 01 2011 · Extraction of rhenium by the salts of QAB is carried out in alkaline medium to separate rhenium from molybdenum. However re-extraction of rhenium from the organic phase containing QAB is difï¬ cult and involves the use of harsh chemicals (chlorine or nitric acid ammonium thiocyanate) (Palant et al. 2007).

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  • Effective Release of Lignin Wiley Online Library

    Francisco Avelino Kássia Teixeira da Silva Men de Sá Moreira de Souza Filho Selma Elaine Mazzetto Diego Lomonaco Microwave-assisted organosolv extraction of coconut shell lignin by Brønsted and Lewis acids catalysts Journal of Cleaner Production 10.1016/j.jclepro.2018.04.126 189 () (2018).

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  • Recovery and Separation of Molybdenum and Rhenium from a

    Recovery and separation of molybdenum and rhenium from a process solution was accomplished by a technique developed by the Federal Bureau of Mines involving a combined solvent extraction and activated carbon adsorption procedure. The processing sequence required treatment of the solution with SO2 to reduce the chlorate ion and adjust the pH prior to solvent extraction of molybdenum and rhenium

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  • Study of the Possibility of Rhenium Extraction and

    extraction of rhenium are approximately 1.5 times lower than those in the leaching solution from direct incineration of raw leaves. For K this reduction is 3.5 times. These results could be explained by the following mechanism of rhenium extraction from fresh leaves with hot ethanol 1 . When the leaves are

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  • Recovery and separation of molybdenum and rhenium from a

    Get this from a library Recovery and separation of molybdenum and rhenium from a process solution. D D Fischer D J R E Lindstrom United States. Bureau of Mines. -- Recovery and separation of molybdenum and rhenium from a process solution was accomplished by a technique developed by the Federal Bureau of Mines involving a combined solvent extraction and

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  • Extraction of molybdenum and rhenium from concentrates by

    Get this from a library Extraction of molybdenum and rhenium from concentrates by electrooxidation. R E Lindstrom Bernard J Scheiner United States. Bureau of Mines.

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  • "Insights in Uranium Extraction from Spent Nuclear Fuels

    The single extraction of rhenium(VII) and uranium(VI) from nitric acid solution by dicyclohexano-18-crown-6 (DCH) solutions was investigated. The extraction of Re(VII) in the form of perrhenate (ReO4−) anion was optimum for a nitric acid concentration of 3 M and was explained by the ion-pair extraction of perrhenate anions by the hydroxonium DCH complex.

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  • TANAKA Precious Metals|Recovery and Refining

    Recovery and Refining. We offer a comprehensive recycling system ranging from the recovery and refining of used scrap metal containing precious metals to

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  • ORIGINAL ARTICLE Investigation of Acidithiobacillus

    germanium and rhenium three times higher in comparison to shaking-flask experiments when considering the difference in solid load of Theisen sludge. Conclusions The extraction of base and trace metals from Theisen sludge despite of its high content of heavy metals and organic compounds was feasible with iron-oxidizing acidophilic bacteria.

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  • Rhenium The Expensive Metal With An Important Use

    Jan 11 2018 · Rhenium is found as a byproduct of refining copper ore as well as the more popular molybdenum. Extraction of the rhenium element has no known adverse side effects to the atmosphere. Usually rhenium is powder but can be formed into a malleable

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  • Rhenium chemical element Britannica

    Rhenium does not occur free in nature or as a compound in any distinct mineral instead it is widely distributed in small amounts in other minerals usually in concentrations averaging about 0.001 parts per million. Chile is the world leader in rhenium recovery followed by the United States Poland Uzbekistan and Kazakhstan.. Rhenium occurs up to about 20 parts per million in molybdenite

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  • What Is Rhenium And What Are Its Applications WorldAtlas

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  • process recovery rhenium

    Get this from a library Extraction and recovery of molybdenum and rhenium from molybdenite concentrates by electrooxidation process demonstration Bernard J Scheiner R E Lindstrom D L Pool United States Bureau of Mines -- The Federal Bureau of Mines has successfully demonstrated an electrooxidation-solvent extraction-carbon adsorption process

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  • Rhenium and iridiumPage 16 of 17UNT Digital Library

    Re is used together with Ir in a number of metallurgical applications. Ir has been used as coating for Re rocket thrusters and as an oxidation-resistant coating in a number of other applications.

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  • Rhenium(VII) Compounds as Inorganic Precursors for the

    The excess of rhenium was investigated as follows 0.1 dm 3 of 20.0 g/dm 3 hexaamminecobalt(III) chloride solution was magnetically mixed with solution containing 569.0 g/dm 3 of perrhenic acid satisfying an excess of rhenium vs cobalt ranging from 10 to 200 . A trial with stochiometric amount of rhenium and cobalt was performed as well.

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  • Solvent Extraction of Rhenium(VII) from Aqueous Solution

    The solvent extraction of rhenium using TiOA as extractant assisted by ionic liquids from aqueous solutions was investigated. The molalities of ReO4– after extraction were measured at impurity ionic strength from 0.2 to 2.0 mol·kg–1 at temperatures from 293.15 to 318.15 K in the aqueous phase. Standard extraction constants K0 at different temperatures were obtained by the Pitzer

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  • New extraction chromatographic material for rhenium

    Aug 01 2008 · New extraction chromatographic material for rhenium separation New extraction chromatographic material for rhenium separation Lučaníková M. Kučera J. Šebesta F. 00 00 00 DOI 10.1007/s Journal of Radioanalytical and Nuclear Chemistry Vol. 277 No.2 (2008) 479â 485 M. Luþaníková 1 2 J. Kuþera 1 3 F. Å ebesta3 1 Nuclear Physics

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  • Solvent Extraction of Technetium and Rhenium with Pyridine

    Analytical separation of rhenium by extraction with n-benzylaniline in chloroform from sulphuric acid media. Analytica Chimica Acta 1972 61 (2) . DOI 10.1016/S0003

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  • Thermodynamics of Solvent Extraction of Rhenium with

    Solvent Extraction of Rhenium in Ionic Liquid with N235. Journal of Chemical Engineering Data 2017 62 (8) . DOI 10.1021/acs.jced.7b00359. Da-wei Fang Zong-ren Song Si-cai Zhang Jun Li and Shu-liang Zang . Solvent Extraction of Rhenium(VII) from Aqueous Solution Assisted by Hydrophobic Ionic Liquid.

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  • New extraction chromatographic material for rhenium

    Aug 01 2008 · New extraction chromatographic material for rhenium separation New extraction chromatographic material for rhenium separation Lučaníková M. Kučera J. Šebesta F. 00 00 00 DOI 10.1007/s Journal of Radioanalytical and Nuclear Chemistry Vol. 277 No.2 (2008) 479â 485 M. Luþaníková 1 2 J. Kuþera 1 3 F. Å ebesta3 1 Nuclear Physics

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  • RheniumCritical Metals HandbookWiley Online Library

    Dec 27 2013 · World mine production of rhenium from the main known sources in 2012 has been estimated at about 44.8 tonnes most of which was produced as a by‐product of molybdenum production. Porphyry copper and copper‐gold deposits are likely to continue as the main source of primary rhenium production for the foreseeable future.

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  • Electrodeposition of rhenium–nickel alloys from aqueous

    Rhenium-nickel alloys were deposited on copper substrates in a small three-electrode cell under galvano- static conditions. The bath solution consisted of ammonium perrhenate citric acid

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  • Thermodynamics of Solvent Extraction of Rhenium with

    Solvent Extraction of Rhenium in Ionic Liquid with N235. Journal of Chemical Engineering Data 2017 62 (8) . DOI 10.1021/acs.jced.7b00359. Da-wei Fang Zong-ren Song Si-cai Zhang Jun Li and Shu-liang Zang . Solvent Extraction of Rhenium

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  • Rhenium Ed Fagan Inc.

    Rhenium does not occur freely in nature nor does it exist as a compound but it is widely spread throughout the Earth s crust. Commercial production of rhenium is obtained by the byproduct of refining and extraction from the flue dusts of copper and molybdenum smelters. Here are a few important facts about rhenium. Atomic number 75

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  • Solvent extraction of heptavalent technetium and rhenium

    The solvent extraction of heptavalent rhenium from aqueous hydrochloric acid by tributyl phosphate (TBP) in n-dodecane (NDD) has been studied over a wide range of TBP and HCl concentrations at 25 40 and 60/sup 0/C. The extraction was found to proceed according to the reaction 3TBP H/sup / ReO/sup -//sub 4/ = (HReO/sub 4/.3TBP).

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  • Chemical Procedures for Rhenium Extraction from Geological

    Rhenium‐Osmium geochronometry for samples with low Re and complex matrices require improved Re extraction methods. Here we investigate plausible controls on efficiency and efficacy of Re extraction during our anion resin bead purification. Four different protocols are compared each isolating a

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  • INTERNATIONAL SYMPOSIUM ON RHENIUM AND RHENIUM

    EXTRACTION OF RHENIUM FROM MOLYBDENITE CONCENTRATES Mahesh C. Jha William A. May Entech Molybdenum Inc. 5950 McIntyre Street Golden CO By-product molybdenite concentrates from copper mines are the most important source of rhenium. The rhenium content is low generally in the few hundred ppm range.

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  • Separation of rhenium from molybdenum and vanadium by

    216 220 220 5 5 V. Yatirajam R. Prosad Department of Chemistry Kurukshetra University Kurukshetra (Panjab) India Summary A method is described for the separation of rhenium from molybdenum and vanadium by extraction with amyl alcohol. The sample solution containing Re VII Mo VI and V V is boiled with hydrazine sulphate in order to obtain Mo V and V IV (Re remains in the heptavalent state

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  • Solvent Extraction of Rhenium(VII) from Aqueous Solution

    The solvent extraction of rhenium using TiOA as extractant assisted by ionic liquids from aqueous solutions was investigated. The molalities of ReO4– after extraction were measured at impurity ionic strength from 0.2 to 2.0 mol·kg–1 at temperatures from 293.15 to 318.15 K in the aqueous phase. Standard extraction constants K0 at different temperatures were obtained by the Pitzer

    Get Price
  • Extraction of rhenium (VII) by tetraoctylammonium bromide

    Jun 01 2011 · Extraction of rhenium by the salts of QAB is carried out in alkaline medium to separate rhenium from molybdenum. However re-extraction of rhenium from the organic phase containing QAB is difï¬ cult and involves the use of harsh chemicals (chlorine or nitric acid ammonium thiocyanate) (Palant et al. 2007).

    Get Price
  • Mass‐transfer mechanisms for Wiley Online Library

    Jei-Kwon Moon Chong-Hun Jung Eil-Hee Lee Byung-Chul Lee Adsorptive separation of rhenium and rhodium in nitric acid solution using a column packed with an extractant

    Get Price
  • Review of technologies for rhenium recovery from mineral

    Sep 01 2011 · Rhenium four-stage extraction process has been modeled at O A = 1 30 at which rhenium extraction from solutions was 97.9 rhenium concentration in extractant was 1000 mg/dm 3. 3.5.4. Rhenium stripping. Taking into account the authors experience in the development and implementation of rhenium recovery technologies

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  • Separation of rhenium from molybdenum and vanadium by

    216 220 220 5 5 V. Yatirajam R. Prosad Department of Chemistry Kurukshetra University Kurukshetra (Panjab) India Summary A method is described for the separation of rhenium from molybdenum and vanadium by extraction with amyl alcohol. The sample solution containing Re VII Mo VI and V V is boiled with hydrazine sulphate in order to obtain Mo V and V IV (Re remains in the heptavalent state

    Get Price
  • Rhenium and iridiumPage 13 of 17UNT Digital Library

    Re is used together with Ir in a number of metallurgical applications. Ir has been used as coating for Re rocket thrusters and as an oxidation-resistant coating in a number of other applications. The high strength of Re at elevated temperature is combined with the oxidation resistance and high melting point of Ir. The use of the two metals together is advantageous due to absence of stable

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  • 10.1016/j.fluid.2014.09.012 DeepDyve

    Jun 11 2020 · Optimization condition of extraction extraction conditions with a extraction ratio of 99.77 at 278.15 K. In industry the system should be kept in high acidity and little Acidity of the extraction

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