US4489895A - Vertical roller mills - Google Patents
A vertical roller mill has a rotary grinding table (1), grinding rollers (3) and a nozzle ring (13) surrounding the table for providing an air stream to entrain ground material. Downstream of each roller is a scraper (20) with a nozzle for directing a blast of air onto the crushed material leaving the roller to break up the material so that finer fractions pass into the conveying air stream ...
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