KULKVARN MED RINGFORMAD SPRINGA.

摘要

The invention relates to an annular gap-type ball mill for continuously pulverizing in particular mineral hard materials comprising an upright grinding container closed by a cover, and housing a rotor whose cone-shaped outer surface limits with the cone-shaped inner surface of the grinding container a grinding gap communicating with a feed aperture and containing grinding pellets, the rotor having a top portion being adapted in its shape to the inner surface of the cover, and including within its range a discharge opening. The annular gap-type ball mill is characterized in that the top portion of the rotor is conical to limit with the cone-shaped cover an annular discharge gap whose lower end of maximum diameter ends in an annular chamber at the open upper end of the grinding gap. The grinding pellets are prevented from sinking down in the grinding gap of which 100% are utilized for the grinding operation so that the residence time required for the pulverization of the mineral hard materials is reduced.