Hammer mills Description
These are high-speed mills operating at speeds of between 2000 and 6000 rpm A set of ‘hammers’ rotate about a central axis in a vertical or horizontal plane. The hammers can either be fixed or can swing freely, in which case the mill is termed a swing-hammer mill (see figure below). The whole system is enclosed in a housing and the outlet for the product is usually via a screen which sieves the product and allows only the required size of particle to pass.
Hammer Mills Characteristics
The product size can be extremely fine – talc can be reduced to a size of 0.0025mm (40%), although an air classifier is required when such product size is required. Maximum capacity is in the order of 10 tons per hour and power consumption is relatively high. Rotating hammer mills are suited to the milling of sifter materials and this type of mill is often used to mill grain and other food stuffs.
Types of hammer mills: Calcite hammer mill, barite hammer mill, talc hammer mill, grain and other food stuffs etc.