Authors:R. Bhanushali, Sachin Pathak, I. Pius, and S. Mukerjee
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.
Authors:Sangita Pal, Suchismita Mishra, S. Satpati, G. Pandit, P. Tewari, and V. Puranik
“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 (Kd) for uranium (Kd,U = 1,450 mL/g from inlet of Effluent Treatment Plant (ETP) and Kd,U = 74,950 mL/g for synthetic solution) compared to high level impurity (1,000 times higher concentration) of manganese (Kd,Mn = 111 mL/g from inlet of ETP and Kd,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.
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.
Authors:Bence Kiss-Dobronyi, Dora Fazekas, and Hector Pollitt
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
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
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 .
. B. S. Rabin 1999 Stress, Immune Function and Health: The Connection John Wiley & Sons New York .
. L. S. Sklar H