Sorption recovery of scandium by phosphor containing ion-exchangers
Abstract
In present work we explored scandium sorption by phosphor containing ampholytes Purolite S 950, Tulsion CH 93, Lewatit TP 260 and cation-exchanger Purolite D 5041. The influence of acidity of parent solutions on scandium distribution coefficient was estimated during sorption experiment in static mode. Scandium recovery was carried out from solutions with initial containing of 100 mg Sc/dm3, sulfuric acid concentration was varied from 0 to 200 g/dm3. The cation-exchanger Purolite D 5041 showed the highest distribution coefficient value under conditions without addition of sulfuric acid (pH 3,16). Then sulfuric acid concentration increase leads to decrease of scandium sorption. The reverse dependence was observed for ampholytes. Tulsion CH 93 has a most value of scandium distribution ratio of 1070 cm3/g when sulfuric acid concentration was 200 g/dm3.
Present of sodium sulfate in solution in concentration range from 0 to 20 g/dm3 suppressed scandium sorption. Maximum value of distribution coefficient was 110 cm3/g for ampholyte Tulsion CH 93. The experiment in dynamic mode was performed by filtration scandium sulfate solution through resin layer. Scandium concentration in feed solution was 85 mg/dm3 and pH was 3.35. Cation-exchanger Purolite D 5041 exhibited highest values of dynamic exchange capacity and total dynamic exchange capacity, which were 17.62 mg Sc/см3 ionits and 66.27 mg Sc/см3 respectively. Scandium recovery from saturated cation-exchanger Purolite D 5041 was performed by sodium carbonate solutions in static mode. Solid to liquid ratio was 1:10. The concentration 180 g/dm3 of sodium carbonate can to provide maximum degree of scandium recovery, which was
68.97 %. An elution in dynamic mode was carried out by 180 g/dm3 solution of sodium carbonate. The degree of scandium recovery from resin phase was low. Its values were 33% for Lewatit TP 260.44% for Tulsion CH 93 and Purolite S 950 and 76% for Purolite D 5041. Thus we recommend the use of cation-exchange resin Purolite D 5041 for scandium sorption. But the use of ampholyte Tulsion CH 93 allows recovering of scandium with highest efficiency from solutions in wide range of sulfuric acid concentration due to increasing distribution coefficient dependence from initial pH of solutions.
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