FIELD: concentration of minerals. SUBSTANCE: apparatus has cylindrical housing 1, eddy chamber 2, set of ring membranes 3 (made in the form of truncated cones). The inner diameter of the lower cone should be equal to or larger than that of the outlet nozzle of the eddy channel of chamber 2. If several products are concentrated, membranes 3 should be mounted concentrically. A conical unloading device is located under eddy chamber 2. EFFECT: higher efficiency. 2 cl, 4 dwg
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