Radiochemical study of saturated sodium chloride brine purification from impurities in the processes of precipitation and coprecipitation

Precipitation of sulfate-ion at CaCl2 excess addition depending on reagent concentrations, FeCl3 additions, pH medium, time and temperature is investigated. Optimal conditions for SO42-, Ca2+ and Mg2+ removing are found. By means of radidionuclides coprecipitation of 51CrO42-, 99MoO42-, 18WO42-, 74AsO43-, 48VO3-, 32PO43-, 125Te(4,6)+ microcomponents (MC) with CaSO4x2H2O and iron (3) hydroxide precipitates (1 stage); iron (3) hydroxide, CaCO3 and Mg(OH)2 (2 stage) - is studied. Technique for brines deep purification from macrocomponents and indicated MC in both static and dynamic regimes is developed. Mechanism of MC sorption by precipitate is considered as Mc protoned forms coordination interaction with iron (3) hydroxide