Solvent Extraction Of Thorium Research Articles

Solvent extraction of thorium in nitric acid solution by tri-dodecylamine and N-Benzyl-didodecylamine

The extraction equilibria of Th in the tri-dodecylamine (TDA) and N-Benzyl-didodecylamine (BDDA) ∼ HNO 3 systems have been investigated. The influence of the amine concentration and the concentrations of nitric acid and various salting agents in the aqueous phase on the distribution ratios for Th, D Th, have been examined. The slope, of the log-log plot, of D Th vs the amine concentration is found to be close to 2 at lower concentrations of BDDA, but changes to 1.6 at higher concentration. The distribution ratio as a function of the nitric acid concentration shows a maximum value, and an equation is deduced from the extraction equilibrium for the Th and HNO 3 to estimate the maximum value; the value so calculated agrees with the experimental value. In addition, the mean activity coefficients of Th(NO 3) 4 in NaNO 3, Ca(NO 3) 2, Al(NO 3) 3 and nitric acid solutions have been calculated from the extraction data. The effect of temperature on the distribution ratio has been examined in the range 280–308 K. Plots of log D Th vs ( 1 T ) appear to be linear and values for the enthalpy of extraction are given at various amine concentrations.

Solvent extraction of thorium from hydrochloric acid solutions by sulphoxides and their mixtures

The extraction of thorium from hydrochloric acid solutions by sulphoxides and their mixtures in various solvents has been investigated. The extraction increases with increase in the concentration of the acid and of the extractant. The species extracted are ThCl 4·2DPSO·HCl, ThCl 4·3DPhSO. Mixed complexes are formed with mixtures of extractants. The extraction of the metals is inversely dependent upon the dielectric constant of the solvent, the initial metal concentration and the temperature of the system.

Studies on the solvent extraction of thorium

The solvent extraction separation of thorium with tri-n-octyl-phosphine oxide was studied. Thorium was determined in gross quantities of uranium compounds using a two-cycle solvent extraction procedure in the presence of EDTA. Uranium was shown to be preferentially extracted by TOPO from a 2M nitrate solution. In addition, it was found that yttrium and the rare earths are extracted by TOPO. Elimination of this interference was accomplished by backwashing with a fresh 2M nitrate wash solution. The methods developed are rapid, selective, and sensitive for the spectrophotometric determination of thorium and yttrium. The systems obey Beer's law under all concentration ranges studied, and by proper choice of final concentration and absorbance cells, the methods can be applied over wide ranges of concentration.

Solvent Extraction of Thorium and Uranium from Beryllium Nitrate Feeds by Tri-n-butyl Phosphate

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent Extraction of Thorium and Uranium from Beryllium Nitrate Feeds by Tri-n-butyl PhosphateR. C. Cairns, M. G. Baillie, B. J. Fox, and R. K. RyanCite this: Ind. Eng. Chem. Proc. Des. Dev. 1968, 7, 2, 177–181Publication Date (Print):April 1, 1968Publication History Published online1 May 2002Published inissue 1 April 1968https://doi.org/10.1021/i260026a004RIGHTS & PERMISSIONSArticle Views78Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (454 KB) Get e-Alerts

Synergistic Effect in the Solvent Extraction of Thorium

AbstractBy using Th‐234 as tracer, the synergistic effects in the extraction of thorium from aqueous solutions with mixtures of organic solvents were investigated for the system Th4+/β‐diketones/TBP/diluents. Four β‐diketones, i. e., acetylacetone, benzoylacetone, dibenzoylmethane and trifluoroacetone, were used. Synergistic enhancements on the distribution ratios were observed in all cases except when acetylacetone was used as the chelating agent at the pH range of 2–3. Based on the experimental observations, a plausible mechanism for the synergistic effect has been suggested. The effect of diluent is also dicussed.