METHOD FOR GRINDING TWO AND MORE RAW MATERIALS Russian patent published in 1997 - IPC

FIELD: grinding equipment for construction materials, and for chemical, metallurgical, ore concentration and other industries. SUBSTANCE: according to method, grinding and drying of two and more materials with different grindability are performed simultaneously. Hard-to-grind brittle material (limestone) is subjected to grinding in press-roll disintegrator together with nonbrittle dampened material (clay) in mill. Agglomerate of brittle material and primary nonbrittle dampened material are subjected to combined grinding and drying in hammer-type mill-drier and to final drying in air-type separator. Coarse particles of ground material carried away from hammer-type mill-drier by drying agent and separated in air-through classifier of primary cleaning and middlings isolated in separator are delivered to roll-type machine for final grinding together with primary material. Hammer-type mill-drier is fed with clay component of raw burden with moisture content of up to 25%. EFFECT: high efficiency. 3 cl, 1 dwg