Rapid synthesis of pollucite by hydrothermal method for the treatment of cesium in wastewater

A hydrothermal method which can convert free cesium ions into stable pollucite at low temperatures was established in this work, avoiding any evaporation pollution during the disposal of cesium containing waste. Meanwhile, rapid synthesis under hydrothermal conditions was achieved using seed guidance, which shorten the growth time of pollucite crystals to 8 h, and making the treatment and disposal of cesium containing wastewater faster. Standard leaching test results show that the leaching rate of Cs was very low (< 3.5 × 10 −7 g·m 2 ·d), it still has good thermal stability at a temperature of 1300 °C, when the cesium content in pollucite reaches 20%.