Abstract
Precipitation stripping phenomena of samarium oxalate from samarium-loaded D2EHPA solution were studied with a conventional impeller. The effect of intensified mixing induced by ultrasonic irradiation was also examined. Morhological variation as well as size distribution of precipitated samarium oxalate were observed with processing factors such as pH value, C2H2O4 concentration, samarium concentration and D2EHPA concentration under ultrasonic irradiation. The needle-like precipitate was identified as Sm2(C2O4)3・10H2O by XRD. Its shape was not significantly influenced by C2H2O4 concentration, samarium concentration and D2EHPA concentration. The average size of precipitates was 4μm at a rotational speed of impeller of 800 rpm. It decreased to 2μm at 1, 300 rpm. However, the size reduction effect caused by ultrasonic irradiation was not so evident as abserved in cobalt oxalate precipitation. Plate-like morphology appeared by the addition of HCl to aqueous phase.
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