Plant concepts for ultrafine dry grinding with the agitated media mill MaxxMill

摘要

The agitated media mill MaxxMill? has successfully been used for several years by a number of customers worldwide in mono-product and multi-product production plants for the fine and ultrafine dry grinding of mineral raw materials. The special construction principle of the MaxxMill? featuring a rotating grinding chamber and one or several eccentrically positioned agitators in combination with a static hollow flow deflector, allows, apart from effective grinding, also unproblematic material supply and material removal from the mill, without requiring additional equipment for handling the grinding media. The mill is usually operated in connection with dynamic air classifiers from different manufacturers, so that the desired maximum particle size can be accurately adjusted down to 97 percent < 3 mu m. Depending on the grinding task, different air classifiers are selected, which are used with different plant concepts, i.e. in open and closed grinding circuits and with or without pre-classification of pre-ground raw materials. Thus the MaxxMill? concept allows energy-efficient and cost effective production of fine and ultrafine products, yielding a throughput rate of up to several tons per hour.