Drum mill

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A drum mill is a rotating cylinder welded from sheet steel . This can also be put under pressure ( compressed air ) for emptying . Designs with a ceramic inner lining or with all-ceramic drums are also known: due to the significantly increased hardness of the wall material compared to steel, better grinding results and lower wall abrasion can be achieved. However, when filling with balls, attention must be paid to the fragility of the ceramic. If only the wall abrasion needs to be minimized, a lining with polyurethane can be used. Drum mills for the laboratory and partly also for the pilot plant scale are mostly made of all-ceramic. A simpler variant are drums made of full ceramic without their own drive, which can be operated via a so-called grinding frame (two, mostly rubber-coated, parallel rollers, one of which is driven externally).

The grinding process can be divided into wet processes (with liquid, e.g. water) and dry processes. The grinding itself takes place with balls, similar to that of the ball mill . The drum mill is well suited for grinding coarse, granular products. This mill is mostly used in the ceramics industry. On it, substances relevant to this industry such as ferrites , minerals and metal oxides are ground.