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Abstract  

Porous zirconia spherical particles have been prepared by internal gelation process. During preparation of these spherical particles, a cationic surfactant, cetrimide was added in the feed broth to increase the surface area and porosity of the particles. The sorption behavior of plutonium was investigated on this material from different complexing aqueous media from the recovery point of view. Distribution ratio studies have been carried out to investigate the effect of varying concentrations of oxalic acid, phosphoric acid, sulphuric acid, nitric acid, sodium carbonate and sodium bicarbonate to optimize the conditions of sorption of plutonium on this ion exchange material.

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Abstract  

“In-House” resin Polyacrylhydroxamic acid (PHOA) has been synthesized and utilized targeting ground water remediation; recovery of uranium from low concentration aqueous solution e.g., mining activities related water, flooding of excavated or deplumed areas, nuclear plant washed effluent and process generated effluents in nuclear plant during front-end as well as back-end treatment. In the present study, treatment of field effluent containing heavy metals and radio-nuclides from contaminated mining sites reflected preference for uranium with respect to manganese. The specific complexation between the extractant and metal ion especially uranium provides high distribution co-efficient (K d) for uranium (K d,U = 1,450 mL/g from inlet of Effluent Treatment Plant (ETP) and K d,U = 74,950 mL/g for synthetic solution) compared to high level impurity (1,000 times higher concentration) of manganese (K d,Mn = 111 mL/g from inlet of ETP and K d,Mn = 10,588 mL/g for synthetic solution). The “In-House” resin showed significant extractability (70–95% elution efficiency) and indicates a possibility of selective removal/recovery of the valuable metal ions even from secondary sources. As a specialty, resin can be regenerated and reused.

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Abstract  

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 with P350 was investigated. The optimum extraction conditions were evaluated with synthetic solutions by studying the parameters of extractant concentration and acidity. The optimum separation conditions for Fe (III) are recognized as 30% P350 and 4.5 to 6.0 M HCl. The optimum extraction conditions for U (VI) are recognized as 25% N235 and 4.5 to 6.0 M HCl. And the optimum extraction conditions for Th (VI) are recognized as 30% P350 and 2.5 to 3.5 M HNO3 in the mixture solutions. The recovery of uranium and thorium from the crystal waste solutions of zirconium oxychloride was investigated also. The results indicate that the recoveries of uranium and thorium are 92 and 86%, respectively.

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PYR Ltd , Concepts used in recovery , 201 2, http://www.pyr.fi/eng/statistics/concepts.html , (last visited 11 March 2012). [6] Finnish environment institute , Producer responsibility in waste

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subsidies and loans ( IMF 2020 ; O’Callaghan et al. 2020 ) to compensate reduced private sector demand. However, as the crisis passes, governments will also need to introduce longer-term recovery packages to help their economies recover and to provide new

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Pollack Periodica
Authors: Réka Csicsaiová, Ivana Marko, Jaroslav Hrudka, Ivona Škultétyová, and Štefan Stanko

necessary to proceed with reconstruction and recovery. The new concept dedicates to the implementation of nature-friendly measures in the sewerage system. It uses infiltration and retention devices to reduce surface runoff. These devices can decrease and

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. Journal of Heat Transfer-Transactions of the ASME Volume , 139/062601-1. [11] Wallin J. , Claesson J. ( 2014 ), Improving heat recovery using

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Clinical and Experimental Medical Journal
Authors: Kornélia Rozália Lazányi, Péter Molnár, Antal Bugán, László Damjanovich, Zoltán Garami, Balázs Fülöp, and Kornélia Szluha

Beyond the biopsychosocial model: integrating disorder, health and recovery Psychiatry 58 44 – 55 . [8]. B. S. Rabin 1999 Stress, Immune Function and Health: The Connection John Wiley & Sons New York . [9]. L. S. Sklar H

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Magyar Sebészet
Authors: Balázs Bánky, Miklós Lakatos, Krisztina Varga, Edit Hansági, Éva Horváth, and Géza Járay

for rectal cancer. N Engl J Med. 2015; 372: 1324−1332. 10.1056/NEJMoa1414882 4 Greco M, Capretti G, Beretta L, Gemma M, Pecorelli N, Braga M: Enhanced recovery

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Arsac LM, Thiaudiere E, Diolez P, Gerville-Reache L: Parameter estimation in modeling phosphocreatine recovery in human skeletal muscle. Eur. J. Appl. Physiol. 91, 419–424 (2004

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