PPT Slide
Zeolites readily formed when sludges were synthesized in Pyrex flasks. Na6Al6Si6O24(NO3)2.4H2O was the most common zeolite. Naturally occurring cancrinite-type zeolites contain carbonate, chloride, sulfate, hydroxide and fluoride. A second SAPO - type zeolite also formed (Na2Al2Si1.7O7.9 (PO4)0.48.3H2O) but was less common.
The number of different anions in these structures suggested that zeolites might be a Tc sink. However, when zeolites were grown in 10 ppm Tc fluids no Tc uptake was observed.
Cancrinite formed in 7 days at 90oC
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