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• W68307080 abstract "The mixed ferrocyanides K/sub 2/MnSTAFe(CN)/sub 6/!, Pb/sub 2/STAFe(CN)/ sub 6/! e(CN)/sub 6/!/sub 3/, K/sub 2/ZmSTAFe(CN)/sub 6/!/sub 2, and (100 mg/l) to adsorb Cs/sup 134/ (sp: act. = 5to 10 mc/l) from aqueous solution. Centnifugation of the slurry for 10 minutes at 3000 rev/min did not result in complete separation of the precipitate from the solution, particularly for pH values greater than 5. A 50% excess of the heavy metal salt did not affect the carrying of cesium and improved the centrifugation properties of the precipitate. The addition of a small amount of 1% gelatin solution to the ferrocyanide slurry and creation of a foam by bubbling air through the solution was shown to be a successful method of concentrating radioactive solutions of cesium. The results show that 60 mg/l of ferrccyanide carrier is sufficient for maximum extraction of cesium. The amount of solution carried over by the foam in this process does not exceed 1.0 to 4.0% of the volume of the starting solution. Three successive extractions of cesium by foaming over a ferrocyanide carrier, each time from the same solution, showed that 98.84% of the cesium was found tn the foam the first time, 89.07% the second time andmore » 81.98% the thind time with an over-all yield of 99.98%. An increase in concentration of NaNO/sub 3/, Na/sub 2/ SO/sub 4/, NaCl, CH/sub 3/COONa, and CH/sub 3/COOH in the aqueous solution led to a sharp increase in the volume of solution carried over by the foam. The possibility of extracting Cs/sup 134/ from aqueous solution by adsorption on a heavy metal ferrocyanide precipitate with a subsequent foam separation of the precipitate by addition of gelatin was established in principle. (TTT) The distribution of various rare earth elements between the solid and liquid phases during the crystallization of their double sulfates with alkali metals was investigated by means of the beta activity of their radioactive isotopes. The original mixture corresponded to the composition of the lanthanides contained in Nb-Ti-rare earth ores of economic interest from which the cerium was previously removed. It was found that the distribution coefficients of La, Pr, and Nd in the liquid phase increases with the number of the element. Crystallization of the double sulfates containing K and NH/sub 4/ by the addition of H/sub 2/SO/sub 4/ results in an enrichment of rare earths beyond Sm in the solution, while Na/sub 2/SO/sub 4/ favors the enrichment of elements beyond Pu. In the absence of sulfuric acid, (NH/sub 4/)/sub 2/SO/sub 4/ forms soluble compounds with the lanthanides and therefore cannot be used for concentrating the heavy lanthanides in the solution. This method might be of interest for separating small amounts of other rare earths added to La, Pm, and Nd. (TTT)« less" @default.
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• W68307080 date "1960-01-01" @default.
• W68307080 modified "2023-09-27" @default.
• W68307080 title "EXTRACTION OF RADIOACTIVE CESIUM BY MIXED HEAVY METAL FERROCYANIDES" @default.
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