The extractor is characterizes in that at the interior of the mixing zone 16, between the input of the phases of the fluids legere and heavy, is placed at least one deversoir 17 which divides the zone of the mixture in the chamber for mixing and in the separation chamber 18, 19, and in that of the pipes with people brought 23 are provided for the supply of the fluid phase legere derived from the chamber 22 to the inside of the hub 11 of the endless screw in the first chamber of the separation and mixing 18, pipes which lead is close to the internal wall of the envelope of the drum in the zone of the fluid phase specifically heavy, and in that for evacuation of the fluid phase legere which has been a separate from the first chamber of the separation and mixing 18 in the following chamber which is the second chamber of the separation and mixing 19 are provided one or more pipes of the rinse 20 montees deversoir 17 which lead also in the zone of the fluid phase.
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