RECOVERY OF URANIUM FROM CARBONATE SOLUTIONS USING STRONGLY ABSIC ANION EXCHANGER Ⅰ.THE OPTIMUM RECOVERY PROCESSES AND COMPOSITION IN RESIN PHASE

摘要

A practical and econmical process for effectively recovering uranium from carbonate solutions is presented.The uranium complexes are made unstable by adjusting the pH of mixed solutions of Na2CO3 and NaHCO3 to about 7-8 by HCl and/or NaOH.Within this range of pH value,the super-equivalent uptake of uranium compared with exchange of Cl- and UO2(CO3)34- can be worked out ,the total freee energy change takes on the minimum value ,the predominant species of uranium in resin phase may be U2O72- except for a little amount of UO22+.