Abstract
Hydrothermal decomposition of K-feldspar in Cs-included NaOH (2.2 mol/kg) and KOH (3.0 mol/kg) solutions with initial Cs/(Cs + Na) and Cs/(Cs + K) ratios varying from 0 to 1 was investigated. Results showed that the solid products exhibited high selectivity for Cs with respect to Na and K, where pollucite crystals instead of analcime and kalsilite in cubic and trioctahedra morphologies with less than 5 mol% Na or K replacement were obtained from Na-Cs (220 °C) and K-Cs (240 °C) solutions respectively. The distribution of Cs between the final solid and solution exhibited as liner relations in similar slops (about 0.06) for the two mixed mediums, and an extremum Cs/(Cs + Na + K) value of about 0.95 in solid phase was derived. Present work indicated that Cs was enriched during the hydrothermal processing on K-feldspar, almost pure pollucite was synthesized even in mixed ion systems, and radioactive Cs could be immobilized from vast polluted silicates including feldspar minerals.
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