No abstract

No abstract

Distribution of molybdenum(VI) and uranium(VI) between aq. sulphuric acid solution and an organic solution containing the extradant such as triisodecyl amine (Alamine 310), tri-n-butyl phosphate (TBP), di-n-pentyl sulphoxide (DPSO) and bis-, (2,4,4-trimethyl pentyl)dithiophosphinic acid (Cyanex 301) and their binary mixtures has been studied. Extraction is quantitative in case of Mo(VI) with the mixture of Alamine 310 and Cyanex 301 in the range 0.2-1.0 M H 2 S0 4 and synergism is observed in the extraction. Separation of Mo(VI) from U(VI) is feasible by TBP and DPSO from 10 M H 2 S0 4 and by the mixture of Cyanex 301 and Alamine 310 from 1 M H 2 S0 4 .

Extraction / Uranium(VI) /Enanthic acid/ Caprylic acid / Pelargonie acid SummaryThe extraction of uranium(VI) into benzene containing enanthic, caprylic and pelargonic acid (HR) 2 has been carried out. Basing on slope analysis, the extracted species are found to be U0 2 R 2 (HR) 2 . The extraction efficiencies of the extradants enanthic (heptanoic), caprylic (octanoic) and pelargonic (nonanoic) acids in the extraction of U(VI) have been compared. The influence of various parameters such as equilibrium pH, extradant concentration on the extraction was found to be in an increasing order with the increase in both the factors. The optimum shaking time was found to be 10 sees for all the three acid extradants. Stripping with various mineral acids, namely aq. HCl, HN0 3 , H2SO4 and HC10 4 , was carried out at different concentrations, where aq. HCl, HN0 3 and HC10 4 gave almost the same trend but with aq. H 2 S0 4 the extraction was quantitative at lower concentration which decreases with increase in acid strength. Synergism with the binary mixture of the extradants was studied and found to be in increasing order upto 0.1 M of the binary mixture, after which it decreases.

The equilibrium extraction behavior of uranium(VI) using a benzene solution containing naphthenic acid either alone or combined with one of the adductants viz., diphenyl sulphoxide, dinonyl sulphoxide, tri-n-butyl phosphate, triphenyl phosphine oxide, tri-n-octyl phosphine oxide, triphenyl arsine oxide, 2,9 dimethyl 1,10-phenanthroline, 1,10-phenanthroline, 4,7-diphenyl 1,10-phenanthroline, 2,2'-bipyridyl and 2,2'-biquinoline is described. The enhancement in the extraction by addition of such neutral adducts is explained in terms of adduct formation of the metal chelates in the organic phase. The composition of the extracted species is obtained from slope analysis and pH0. 5 values are also obtained. The effect of various parameters such as equilibrium pH, extractant concentration, various diluents on the extraction of U(VI) with 2% naphthenic acid has been carried out. Stripping or back extraction with various mineral acids was also studied.