Abstract
The knowledge of ruthenium speciation under aqueous alkaline conditions was applied for the recovery of radio-ruthenium from the alkaline radioactive feeds using a Chromosorb W (dimethyldichlorosilane treated, acid washed celite diatomaceous silica; mesh size 60/80) based extraction chromatography resin (ECR) loaded with Aliquat 336, a quaternary ammonium compound. The experimental conditions were optimized for the uptake of Ru from alkaline feeds and its subsequent desorption using batch studies. Although the precipitation of the black RuO2·xH2O at the ECR surface helps in the quantitative (up to 500 ppm Ru) uptake of ruthenium, it’s desorption was not favorable. About 75% of the Ru was desorbed from the ECR by the batch method using sequential washing by alkaline hypochlorite solution and nitric acid solution. The sorption isotherm was studied for the above system under optimized conditions and the uptake data conformed to the Langmuir isotherm model while chemisorption was suggested to be the mechanism. Column studies, under optimized conditions, showed ~82% Ru recovery in the first cycle which sharply decreased to ~60% in the subsequent runs. The FTIR studies were undertaken to understand the mechanism for the ruthenium extraction from alkaline medium and it’s desorption from the resin.
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