Abstract:The stage-efficiency of a single-stage prototype (d70) centrifugal extractor and the cascade is tested by HNO₃-Nd³⁺ and 30%TRPO-kerosene system. The experimental results of the single-stage centrifugal extractor show that the carryover of the two phases decreases with increasing ratio of the two flow rate and rotation rate and the stage efficiency increases with not only decreasing total flow rate but also increasing rotor speed. However, the experimental results of the cascade show that the average stage efficiency of the cascade increases with not only decreasing total flow rate but also increasing rotor speed in both three-stage mode and two-stage mode.

Key words: centrifugal extractor; cascade; carryover; stage efficiency