page_title: VSI mill
section_title: Grinding principle
hierarchical_section_title: VSI mill / Grinding principle
caption_attribution_description: English: A principal scheme of a vertical shaft impact mill Русский: Принципиальная схема центробежно-ударной мельницы
context_page_description: A VSI mill is a mill that comminutes particles of material into smaller particles by throwing them against a hard surface inside the mill. Any hard or friable materials can be ground with low value of metal waste. This type of mill is combined with a classifier for fine tuning of a product size.
context_section_description: A schematic drawing of a VSI mill is shown at Fig. 1. Raw material particles transports via hopper (1) into the accelerator (2). An accelerator (2) rotates with a high speed and particles increase their speed by a centrifugal force. After leaving channels of the accelerator particles impact with a wear plate (3) in the grinding chamber. A high speed impact leads to destruction of particles into pieces of different size. Big particles (greater than 1 mm) fall down to outlet (5) and later they transport to hopper by an elevator. Other particles (less than 1 mm) lift by air stream into a classifier where blades (4) make rotating dust flow. Middle size particles shift to wall by centrifugal force in a big chamber of a classifier and fall down to cone (6) and later they move into an accelerator (2). Small particles move by air stream to outlet (8). Fine tune of a product size is achieved by changing of blade angle.
caption: Fig. 1. A schematic drawing of a VSI mill
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