a centrifugal extractor for extraction of an organic phase from a liquid mixture , such as liquid radioactive wastes , is disclosed . in the centrifugal extractor , both the separating weir and the divert disk are designed to be adjustable in their vertical positions . the extractor , thus , desirably separates the organic phase , including usable elements in addition to chemically toxic high radioactive elements , from the aqueous phase and desirably controls the reaction time of the two phases regardless of a variation of the mixing ratio and the rotational speed of the two phases . in the centrifugal extractor , a liquid suction and rotation unit sucks and rotates the liquid mixture and separates the organic phase from the aqueous phase while controlling the reaction time of the two phases . a height - adjustable separation weir unit is designed to locate the separating weir at a boundary layer between the two separated phases . a housing unit supports the suction and rotation unit and provides the path of two separated phases to the outside of the extractor .