non contact grinding coal mill
non contact grinding coal mill . 2020 07 05T00:07:09+00:00. Grinding Mills an overview ScienceDirect Topics. Autogenous grinding or semiautogenous grinding mills can be operated in open or closed circuit However, even in open circuit, a coarse classifier such as a trommel attached to the mill, or a vibrating screen can be used The oversize material is recycled either