Shyrykalova A. The colloid-chemical regularities of Uranium (VI) Compounds Flotation Isolation from Aqueous Solutions

The dissertation is devoted to the establishment of colloid-chemical regularities of the uranium(VI) compounds isolation from diluted aqueous solutions using precipitating flotation, flotoextraction, flotation with the carrier and to the working out of the effective methods of aqueous solutions purification on the basis of the data obtained. The possibility of the intensification of uranium compound flotation isolation from dilute nitrate, sulphate and carbonate solutions has been proved by the experiments with the use of flotoextraction and flotation with the carrier. The new effective flotation reagents, such as thin emulsified solution of the trialkylamine (TAA) in white spirit and thin dispergated solid solution of the TAA in paraffin was have been suggested. The optimal conditions (pH medium, reagent consumption, flotation time, temperature) of uranium compound isolation from dilute aqueous solutions with the help of the proposed reagents in absence or presence of different electrolytes have been determined.The interaction mechanism of reagents with uranium compounds was suggested. It takes into account simultaneous course of complex formation and hydrolysis reactions, analysis of chemical content and colloid chemical properties of reagents. A new effective method of the uranium(VI) compounds isolation from diluted sulphate solutions by flotation with the carrier wiсh is thin-dispersed trialkylamine in paraffin solid solutions has been developed. It allows to decrease uranium concentration in purificated solution up to the maximum permissible rates (maximum concentration limit) with the reagent regeneration ability and its reuse.