Abstract
The possible recovery of three microelements contained in the sludges resulted after chemical leaching of uranyl ions from
uranium ores was investigated, using four types of zeolites as adsorbents. The variation of the retention degree in time of 3
cations: Fe3+, Ti4+ and Ni2+, adsorbed on: ETS-10, ETS-4, ZSM-5 and mordenite was followed. The characteristic adsorption
parameters connected to Langmuir and Freundlich isotherms were also determined. For a given adsorbent, the rate of global
retaining process depends on the zeolite type and the adsorbed metallic ion, being higher for Fe3+ than for Ti4+ or Ni2+ species.
Each metallic ion is much more strongly linked to the ETS-10 and ETS-4 than to ZSM-5 and natural moredenite zeolite.