63Ni AND 57Co UPTAKE FROM SIMULATED FLOOR DRAIN WATERS AND ACIDIC DECONTAMINATION SOLUTIONS ON TIN ANTIMONATES

摘要

High decontamination levels (DF over 1 000) were measured when tin antimonate of high Sn/Sb metal substitution was tested for nickel and cobalt uptake in dynamic column experiments. In these experiments large volumes, up to 18 000 bed volumes, of crude floor drain water simulate were decontaminated with respect to radioactive nickel ( 63 63Ni) and cobalt ( Ni) 57 57Co). The DF-level of nickel was observed to be higher when compared to cobalt, which is in contrast to earlier batch experiments. Considerable peptisation of one tin antimonate, pyrochlore-structured, was observed that will probably prevent their column use at decontamination processes. It was also demonstrated that tin antimonates can by used for actinide uptake: high distribution coefficients for plutonium and americium were measured, over 100,000 ml/g and 4,000,000 ml/g from acidic solutions, respectively.