Simultaneous Insolubilization of Cesium and Lead in Incineration Fly Ash Using Phosphoric Acid and Magnesium Solution
諸岡, 龍 ,
土手, 裕関戸, 知雄
44 , 2016-07-31 , 宮崎大学工学部
In order to obtain the knowledge on simultaneous insolubilization of cesium and lead in incineration fly ash using phosphoric acid and magnesium solution, the insolubilization experiments of cesium in aqueous solution by the addition of phosphoric acid and magnesium solution and leaching test of stabilized fly ash were conducted. pH less than 12 was necessary to insolubilize cesium as CsMgPO4 using phosphoric acid magnesium. It was necessary to add the amount of phosphorus in P/Cs of 1000 in a molar ratio to fly ash to reduce lead concentration in leachate to the landfill standard of 0.3mg/L or less. At P/Cs of 1000, Mg/Cs of 20, and addition rate of P and Mg solution of 40%, the dissolution rate of the cesium could be less than 20%. These results indicated that it was possible to simultaneously insolubilize of cesium and lead in incineration fly ash using phosphoric acid and magnesium solution.