Used in grinding (or mixing)
materials like chemicals, ores, paints and ceramic raw materials a ball mill, a
type of grinder, is a cylindrical device. Partially filled with the material to
be ground plus the grinding medium ball mills rotate around a horizontal axis.
Including flint pebbles, stainless steel balls and ceramic balls, different
materials are used as media. The material is reduced to a fine powder by an
internal cascading effect.
On the principle of critical
speed the grinding works. As along the direction of the cylindrical device that
speed after which the steel balls (which are responsible for the grinding of
particles) start rotating, critical speed can be understood. This causes no
further grinding.
For grinding crushed materials
the ball mill with ball mill jars
is a key piece of equipment. For powders such as silicates, refractory
material, cement, glass ceramics, fertilizer, etc it is widely used in
production lines. It is used for ore dressing of both non-ferrous and ferrous
metals as well. Either wet or dry the ball mill can grind various ores and
other materials. Due to different ways of discharging material there are two
kinds of ball mill, grate type and overfall type. Key properties of grinding
media are density, size, composition, and hardness.
Size
The smaller is the particle size
of the final product the smaller the media particles. At the same time, as
compared to the largest pieces of material to be ground, the grinding media
particles should be substantially larger.
Density
As compared to the material being
ground the media should be denser. If the grinding media floats on top of the
material to be ground it becomes a problem.
Hardness
To grind the material the ball
mill media needs to be durable enough. At the same time it should not be so
tough that it also wears down the tumbler at a fast pace where possible.
Composition
There are special requirements
various grinding applications. On the fact that some of the grinding media will
be in the finished product some of these requirements are based. On how the
media will react with the material being ground others are based.
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