FIELD: manufacture of articles from lumpy materials. SUBSTANCE: part of lumpy material is subjected to grinding for obtaining material in form of grains at outlet at definite rang of sizes, after which material is directed to common reservoir downward in flow and is mixed with coarse grains which were not subjected to grinding, thus making it possible to obtain required sizes of grains by one pass. EFFECT: enhanced efficiency. 7 cl, 4 dwg
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