Coprecipitation of Microamounts of Cesium with Precipitates of Transition Metal Ferrocyanides in Alkaline Solutions

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Experiments on coprecipitation of microamounts of Cs with precipitates of copper, nickel, and cobalt ferrocyanides in alkaline solutions showed that the dependences of the distribution coefficients (Kd) of 137Cs on pH of the liquid phase have a pronounced maximum at pH 10.0 ± 0.2 (Kd ≈ 8 × 105), 10.5 ± 0.2 (Kd ≈ 2 × 106), and 10.6 ± 0.3 (Kd ≈ 5 × 105), respectively. This phenomenon is associated with the formation of mixed precipitates of transition metal ferrocyanides and hydroxides, surpassing in the sorption characteristics the phases of the corresponding ferrocyanides. The mechanism of coprecipitation of microamounts of cesium with precipitates of transition metal ferrocyanides in alkaline solutions and the conditions of maximum recovery of cesium from solutions of various compositions were determined.

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