Grinding is used to finish work pieces
that must show high surface quality and high accuracy of shape and dimension.
and physical analytical methods it is essential that the specimen is perfectly
homogenized to an adequate degree of analytical fineness.
MRC provides reliable range of grinders and mills for sample
preparation, for coarse, fine and ultrafine size reduction of almost any
Milling also refers to the process of breaking down, separating, sizing, or
classifying aggregate material. For instance rock crushing or grinding to
produce uniform aggregate size for construction purposes, or separation of
rock, soil or aggregate material for the purposes of structural fill or land
reclamation activities. Aggregate milling processes are also used to remove or
separate contamination or moisture from aggregate or soil and to produce
"dry fills" prior to transport or structural filling.
may serve the following purposes in engineering:
Increase of the surface area of a solid
Manufacturing of a solid with a desired grain size
Pulping of resources
A typical type of fine grinder is the ball mill. A slightly
inclined or horizontal rotating cylinder is partially filled with balls,
usually stone or metal, which grinds material to the necessary fineness by
friction and impact with the tumbling balls. Ball mills normally operate with
an approximate ball charge of 30%. Ball mills are characterized by their
smaller (comparatively) diameter and longer length, and often have a length 1.5
to 2.5 times the diameter. The feed is at one end of the cylinder and the
discharge is at the other.
Small versions of ball mills can be
found in laboratories where they are used for grinding sample material for
Operation of a ball mill: