No abstract

Recent efforts at the Idaho Chemical Processing Plant (ICPP) have included evaluation of cesium removal technologies as applied to ICPP acidic radioactive waste . . streams. Ammonium molybdophosphate (AMP) immobilized.on .a polyacfLlonitrile support (AMP-PAN) has been studied as an ion exchange agent for cesium removal from acidic waste solutions. Capacities;. distribution coefficients, elutability, and kinetics of cesium extraction, have been evaluated. Exchange breakthrough curves using small columns have *been determined fiom 1M HNO, and simulated waste solutions. The theoretical capacity of AMP is 213 g Cskg AMP. The average experimental capacity in batch contacts with various acidic solutions was -1 5 0 g Cskg -.AMP. The measured cesium distribution coefficients fiom actual waste solutions were 3287 d / g for dissolved zirconia calcines, and 2679 d / g for sodium-bearing waste. The cesium in the dissolved alumina calcines was analyzed for; however, the concentration was below analytical detectable limits resulting in inconclusive results.The reaction kinetics are very rapid (2-10 minutes). Cesium absorption appears to be independent-of acid-c-oncentration-over-tlie range tes~eeci-(Grli~~o5ivl-~G~)), ----