FIELD: furnaces. SUBSTANCE: loose fractions of necessary size are obtained at the outlet of a rotary furnace by mixing and preliminary grinding a piece-shaped mass of the product which is fed through a filling bin by ribs on the inner surface of a drum and the outer surface of a flue tube inside which hot gas is passed. The dried product enters a ball mill where the pieces are further ground and milled, the material enters a sieve through a hole in the back wall of the ball mill for sieving the fine fraction. EFFECT: improved structure. 2 dwg
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