Crusher - WikipediaA crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. Crushers may be used to reduce the size, or change the form, of waste . Querns and mortars are types of these crushing devices. . of the sixteenth-and-seventeenth centuries;and as always, the charcoal needed to smelt metals,.what type of crusher is required to crush sillimanite,Types of Crushers - Mineral Processing / MetallurgyNov 11, 2016 . Some roll crushers, notably the light coal crushing type, have more of a tearing . This requirement was met for a number of years by the double.
what type of crusher is required to crush sillimanite