Mixer settlers
A mixer settler is an extraction device in which two immiscible liquids of different weights (e.g. aqueous and organic phases) are mixed with the aid of stirrers.
Certain chemical compounds pass from one liquid phase to the other. Both liquids then settle again through natural gravity.
Mixing stackers and tubular mixer stackers are used, for example, in the reprocessing of spent fuel assemblies to separate the fissile materials uranium and plutonium from the other components of the solution (see also “ PUREX process ”).