An attritor mill, also known as a stirred ball mill, is a type of mill used to grind and mix materials into fine particles. Attritors are used to grind materials like chemicals, ores, pyrotechnics, paints, and ceramics.
Here are some features of an attritor mill:
Grinding media
Attritors use smaller media with a diameter less than 5 mm, which leads to more media-material contact area. The grinding media is typically made of steel or ceramics.
Agitator
The attritor mill has an agitator located in the grinding chamber that consists of impellers or discs mounted on a shaft. The agitator shaft rotates at high speeds, causing intense grinding and mixing.
Working principle
Attritor Mill
operate on the principle of impact and attrition, using a combination of impact, compression, and shear forces to grind the material.
Types
There are different types of attritors, including dry grind, wet grind, regular speed, and high speed.
THREE BASIC TYPES OF WET GRIND ATTRITORS
BATCH ATTRITORS (“S” MACHINES)
The operation of the batch Attritor (Fig. 2) is very simple. All the
material can be loaded directly into the grinding tank; no premixing
or pre-dispersing is needed. Since the top-open grinding tank is
stationary, the process can be visually observed and corrections and
additional ingredients can be introduced at any time. The maximum
feed material size can be up to 10mm, provided the material is
friable; otherwise, any 10 mesh down material is feasible to be
processed in this machine.
All production “S” machines are equipped with
a built-in pumping system which maintains circulation during grinding
for accelerated attrition and uniformity. The pump can also be used
for discharging.
Batch Attritors are used to process hard-to-grind materials, such as
tungsten carbide, silicon carbide, and various metals. High viscosity
slurry with up to 30,000 cps can a
this system is a combination of an Attritor and a
holding tank which is generally 10 times the size of the
Attritor. One of the essential requirements of the Q-
Attritor system is the high circulation (or pumping) rate.
The entire contents of the holding tank are passed
through the Attritor at least once every 7-8 minutes.
At this rapid speed, the premixed slurry is pumped
through a confined media bed. The media act as a
dynamic sieve, allowing the fines to pass through
quickly, while the coarser particles follow a more
tortuous path and are ground finer. (Fig. 4) The slurry
can be continuously monitored, additional ingredients
can be added to the premix tank at any time during the
grinding, and the processing can be terminated
precisely.