crushing

…such as talc, must be crushed to the particle size required for use. Sizes in use vary from 4 grit, which measures about 6 millimetres (1/4 inch) in diameter, to as fine as 900 grit, which measures about six microns (0.00024 inch) or about one-tenth the thickness of a human…

All except soft materials are first crushed, often in two stages, and then ground, usually in a rotating, cylindrical ball, or tube mills containing a charge of steel grinding balls. This grinding is done wet or dry, depending on the process in…

Some ores occur in nature as mixtures of discrete mineral particles, such as gold in gravel beds and streams and diamonds in mines. These mixtures require little or no crushing, since the valuables are recoverable using other techniques (breaking up placer material in log…

As-mined iron ore contains lumps of varying size, the biggest being more than 1 metre (40 inches) across and the smallest about 1 millimetre (0.04 inch). The blast furnace, however, requires lumps between 7 and 25 millimetres, so the ore must be crushed to…

In modern mechanized wine production, the grapes are normally crushed and stemmed at the same time by a crusher-stemmer, usually consisting of a perforated cylinder containing paddles revolving at 600 to 1,200 revolutions per minute. The grape berries are crushed and fall through the…