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WATER LEACHING OF ALKALINE METALS, Al AND Si FROM SELECTED ALUMINOSILICATES

Laboratory prepared mica Cs-tetra-ferri-annite, CsAlSiO4, Cs-montmorillonite and Cs-zeolite 13X together with natural phyllosilicates (biotite, muscovite, illite, and Na-montmorillonite), orthoclase, analcime, and zeolites (NaY-Z, Na4A-Z) were tested on leaching of alkaline metals, Al, and Si with water at 100 o C. There was found good potential for leaching of alkali elements. Cesium is better leachable from Cs-minerals (mica, alumosilicate and zeolite) than K or Na from relating K- and Na- mineral analogues. From all samples except zeolites silicon leaches more easily than aluminium. Iron and/or aluminium bonded in octahedral positions in micas and montmorillonites are the least leached elements almost from all samples except zeolites. From tetrahedral position of zeolites the aluminum leaches out easily due to rich pore texture of zeolites. The leaching of alkali elements and aluminium increases with increasing ratio of Al/Si in related solid samples. The structural considerations that led to the hypothesis about very high structural stability and limited leachability of micas have been fully confirmed. The micas are most leach-resistant materials and therefore Cs-tetra-ferri-annite can be considered as a waste form for the fixation of Cs from radioactive Cs waste. Cs-montmorillonite bonds Cs + more strongly than Na + ion so that Namontmorillonite can be considered for an outer barrier capable of buffering the possible escape of Cs.