FIELD: equipment for grinding hard rock materials. SUBSTANCE: grinder has carrier frame, outer grinding member made in the form of hollow cylinder composed of wear-resistant metal rings with grooved internal surface. Said rings are arranged one above another with gap between said rings allowing air to pass into working space for removal of dust particles. Rings are united in two groups: even and odd rings. Each ring in group is joined to two beams arranged on opposite sides of said rings. Single-roll unbalancing vibration exciters are secured on beams. Central destructing tool is made in the form of drum with side destructing and classifying working surface. Drum internal cavity is communicated with suction device. Adjusting device is positioned in annular discharge slot. EFFECT: increased efficiency in destructing kimberlite ore while retaining diamond crystals. 2 cl, 4 dwg
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