Abstract: Apparatus for separating mercury from mercury containing material is disclosed. Apparatus comprises a closed horizontal generally barrelshaped vessel having ports for charging the vessel and for discharging the mercury and the treated residue, and agitating means. The vessel has opposed conical sections and a central cylindrical section. The agitating means comprises a rotatable spindle coaxially extending within the vessel and provided with a plurality of spokes varying in length to conform with the shape of the vessel. Preferably the spokes are provided with knife-like tips and they may be arranged in rows, the spokes in each row being off-set from the spokes in the next row except for those in the central cylindrical section.