Industry Information
Rotor Mills
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Rotor mills are used for the fine grinding/reduction of a
wide variety of materials for many different applications. Particular
instruments or models may be more suitable for certain materials, but in
general rotor mills are used for soft, fibrous, hard, and even
temperature-sensitive samples like liquid nitrogen. Some agricultural
applications include the grinding of plant materials, wood, fertilizers, seeds,
straw and tobacco. Rotor mills may be used in the chemical or plastics
industries for materials such as synthetic resins, rubber granulate,
super-absorbent polymers, activated charcoals, powder coatings and plastics
such as PET, PP, ABS, polystyrole, polycarbonate. They are also used for food
and feeds like corn, feed pellets, coffee beans, rice, dried fruits and
vegetables, sweets, spices and teas. Geology and metallurgy applications may
include the grinding of limestone, coal, coke and bentonite, while applications
for biology could include animal tissue, collagen, bones, and dried larvae. Rotor
mills are also used in the reduction of drugs and pharmaceutical raw materials in
the medical and pharmaceutical industries; and the reduction of electronic
components (circuit boards) and fossil and secondary fuel waste in the
environmental research and recycling industries.
Most rotor mills are powered by electric motors and can
operate at various speeds. They also include safety housings to protect the
motor and electrical components from dust and material penetration. Cassette
systems offer simple loss-free sample recovery and help prevent cross
contamination. Most rotor mills also include exchangeable grinding and sieve
inserts. Grinding tools come in materials including steel, stainless steel,
titanium, and stainless steel with wear-resistant coating. Sieves usually come
with either trapezoid or round holes of various sizes typically from 0.08 to
10mm. There are also options for rotors and rings including reinforced rims to
offer greater stability for the ring sieve; and distance sieves were designed
for the specific purpose of grinding brittle and/or temperature sensitive
materials such as resins and powder coatings. Some rotors and ring sieves are
available with abrasion-resistant coatings for processing abrasive substances
like fertilizers. Titanium rotors and ring sieves with titanium-niobium coated
cassettes and covers are recommended for heavy-metal-free, non-abrasive
materials.
There are also a few different options for depositing the
feed into the rotor mill. This can be done manually or often times by use of
vibratory feeders, which are connected by an interface to the mill.
Regular/automatic feed deposit will ensure undifferentiated grinding results
while maximizing output as well as eliminating the risk of overloads. Maximum
feed sizes may vary among brands and models, but the machines can usually grind
materials in a range from 10 to 15 mm. Materials that are larger than this must
go through a preliminary reduction via a crusher or mill cutter (depending on
the characteristics of the material) before being introduced to the rotor mill
for fine grinding. Final fineness across materials grinded/reduced in rotor
mills can be expected to be 40 and < 40 µm.
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Rotor Mills - International Process Equipment Company |
Rotor Mills - International Process Equipment Company |