FIELD: process engineering.
SUBSTANCE: invention relates to separation of suspension components by gravity settling to produce thickened suspension and clarified fluid, and may be used for mineral suspensions, in particular, for red slime formed in extraction of bauxite and for slimes with high content of sand. Proposed unit comprises suspension decanting tank, suspension feed device, clarified liquid discharge channel and device arranged on tank bottom wall or nearby it to remove thickened suspension from the tank. Proposed unit comprises elongated rotary open-spiral element extending for definite distance into tank from external medium nearby tank bottom wall. Said element features an open spiral in direct and open contact with the tank inner space at significant section of said distance. Unit incorporates the drive to revolve open element.
EFFECT: removal of suspension with high concentration of solids without dilution.
31 cl, 6 dwg, 3 ex, 1 tbl
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