Mechanical screening, often just called screening, is the practice of taking granulated ore material and separating it into multiple grades by particle size. This practice occurs in a variety of industries such as mining and mineral processing, agriculture, . Additionally the machines can be categorised into moving screen and static.
In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the . Before the advent of heavy machinery the raw ore was broken up using hammers wielded by hand, a process . The simplest sizing process is screening, or passing the particles to be sized through a screen or number of screens.