A pug mill is a machine in which clay or other materials are mixed into a plastic state or a similar machine for trituration of ore.Industrial applications are found in pottery, bricks, cement and some parts of the concrete and asphalt mixing processes. A pug mill may be a fast continuous mixer. A continuous pug mill can achieve a thoroughly mixed, homogeneous mixture in a few seconds, and the right machines can be matched to the right application by taking into account the factors of agitation, drive assembly, inlet, discharge, cost and maintenance.
Mixing materials at optimum moisture content requires the forced mixing action of the pug mill paddles, while soupy materials might be mixed in a drum mixer. A typical pug mill consists of a horizontal boxlike chamber with a top inlet and a bottom discharge at the other end, 2 shafts with opposing paddles, and a drive assembly. Some of the factors affecting mixing and residence time are the number and the size of the paddles, paddle swing arc, overlap of left and right swing arc, size of mixing chamber, length of pug mill floor, and material being mixed.