S.R. Mohanty

Bio: S.R. Mohanty is an academic researcher from Utkal University. The author has contributed to research in topics: Thermal decomposition & Aqueous solution. The author has an hindex of 3, co-authored 5 publications receiving 65 citations.

A Brief Review on Solvent Extraction of Uranium from Acidic Solutions

Abstract: Uranium solvent extraction (SX) from aqueous acidic solutions is reviewed. First the uranium availability in earth as well as resources, mining and production reports is presented and followed by SX basic flowsheet and various important stages. Extraction, scrubbing, stripping and finally solvent equilibrium are presented in a flow-sheet form. The second half of the review discusses the various extractants used for uranium extraction and separation from acidic solutions. The extractants are divided in four types: 1) nitrogen-based extractants, 2) phosphorous-based extractants, 3) sulfur-based extractants, and 4) other extractants. Nitrogen-based extractants cover predominantly the amides and amines functional group containing extractants. The phosphorous-based extractants: tri-butyl-phosphate (TBP), di(2-ethylhexyl) phosphoric acid (D2EHPA), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl (PC88A), tri-n-octyl-phosphine oxide (TOPO or Cyanex 923) and bis(2,4,4-trimethyl pentyl) phosphinic acid (Cyanex 272) ...

Influence of irradiation on the thermal decomposition of lithium perchlorate

Abstract: The influence of Co-60 gamma-irradiation, up to 500 Mrad, on the kinetics of the thermal decomposition of lithium perchlorate has been studied over the temperature range 400–440°C. The material (m.p. 236°C) decomposes in the molten state and the lithium chloride formed remains dissolved initially but separates out as solid after about 50% decomposition. Decomposition occurs in four stages, viz., (i) initial gas evolution, (ii) induction, (iii) acceleratory and (iv) decay. Kinetic analysis of stages (i) and (ii) could not be made with any degree of certainty. The acceleratory and decay stages analyse according to the Prout-Tompkins relationship, first order law, and the contracting volume formula with two constants in each case, one for the acceleratory and the other for the decay stage. Activation energies for these two stages calculated from the Prout-Tompkins constants are 64.1 and 33.3 kcal mole−1 respectively. Irradiation increases initial gas evolution and shortens the induction period. It a...

Solvent extraction of plutonium (IV), uranium (VI), and some fission products with Di-n-octylsulfoxide

Abstract: Extraction behavior of plutonium(IV), uranium(VI), and some fission products from aqueous nitric acid media with di-n-octylsulfoxide (DOSO) has been studied over a wide range of conditions. Both the actinides are extracted essentially completely, whereas fission product contaminants like Zr, Ru, Ce, Eu, and Sr show negligible extraction. The absorption spectra of sulfoxide extracts containing either Pu4+ or UO2 2+ indicate the species extracted from nitric acid into the organic phase to be Pu(NO3)4. 2DOSO and UO2(NO3)2. 2DOSO, respectively. Extraction of these actinides decreases with increasing temperature, indicating the extraction to be exothermic. DOSO extracts plutonium and uranium better than di-n-hexylsulfoxide (DHSO) under all condition and is also more soluble in aromatic diluents than the latter. The effect of gamma radiation on the extraction properties of DOSO is found to be similar to that of DHSO.

Synergic Extraction of Actinides

Abstract: Studies on the solvent extraction of actinide ions by different combinations of extractants have been reviewed. Various equilibria involved in the extraction processes and the formation of the extractable complexes have been considered along with their equilibrium constant data. Various methods which are useful in establishing the composition and the nature of the extractable complexes are presented. The data on isolation and structural studies of some complexes, involved in synergic extraction, are also included. A brief description of the different areas in which synergic extraction is finding application is also given. Many combinations of extractants, where the studies conducted are very few but, which are likely to yield enhanced extractions are indicated. Areas of research, both from the academic and applied points of view, which require attention are suggested.