FIELD: enrichment of heavy fine-fraction concentrates for extraction of useful minerals in free not chemically fixed state both directly from starting rock mass, or from its concentrates or from concentration tailings. SUBSTANCE: method consists in mixing rock mass which was preliminarily sized with water and supplying this mass by means of pump to multi-passage volute mounted above taper, parabolic or irregular sizing sieve of hydraulic screen where from hydraulic mixture is distributed over surface of hydraulic screen by smooth flows via several passages, thus forcing hydraulic mixture through sieve; sizing may be effected both in one and in several (stage by stage) hydraulic screen in sieves having sizing holes of different diameters. The undersize from last screen is fed to cellular pulp line consisting of several pipes-cells; each of them is provided with several shut-off devices with units for control of their depth and rate of discharge of hydraulic mixture. In processing starting rock mass having large specific gravity, vibrator is mounted before each shut-off device on cellular pulp line at varying angle α and at varying vector of power pulse relative to direction of flow of hydraulic mixture in pulp line; provision is made for control of power pulse and frequency of vibrations. Hydraulic mixture (pulp) discharged from each pipe-cell through each shut-off device containing enriched concentrate is fed to settler and thickener. Thickened concentrate from settler and thickener is treated in centrifugal concentrator to obtain pure mineral or heavy concentrate in magnetic-and-liquid separation complex. EFFECT: enhanced efficiency of enrichment of fine-fraction concentrates. 19 cl, 7 dwg
