Mills
A grinding mill is a unit operation designed to break a solid material into smaller pieces. There are many different types of grinding mills and many types of materials processed in them. Historically mills were powered by hand (mortar and pestle), working animal (horse mill), wind (windmill) or water (watermill). Today they are also powered by electricity. The grinding of solid matters occurs under exposure of mechanical forces that trench the structure by overcoming of the interior bonding forces. After the grinding the state of the solid is changed: the grain size, the grain size disposition and the grain shape. Grinding 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
Grinding machines
In materials processing a grinder is a machine for producing fine particle size reduction through attrition and compressive forces at the grain size level. See also crusher for mechanisms producing larger particles. In general, grinding processes require a relatively large amount of energy; for this reason, an experimental method to measure the energy used locally during milling with different machines was recently proposed.
Types
- Air Classifier Mills
- Air Swept Mills
- Attrition Mills
- Bar Mills
- Barrel Mills
- Ball Mills
- Bead Mills
- Cage Mills
- Centrifugal Grinding Mills
- Classifier Mills
- Coal Mills
- Coarse Powder Mills
- Cold Rolling Mills
- Colloid Mills
- Comminuting Mills
- Cone Mills
- Continuous Mills
- Cross Beater Mills
- Cryogenic Mills
- Delumping Mills
- Disc Mills
- Dispersion Mills
- Dry Pearl Mills
- Finishing Mills
- Fluid Energy Mills
- Fluid Jet Mills
- Fluidised Bed Opposed Jet Mills
- Glass Mills
- Hammer Mills
- Impact Mills
- Laboratory Mills
- Micronizing Mills
- Ore Mills
- Pebble Mills
- Penn Mills
- Pharmaceutical Mills
- Pin Mills
- Pulverizer Mills
- Raymond Mills
- Rod Mills
- Roller Mills
- Sanitary Mills
- Sieve Mills
- Spiral Jet Mills
- Trapezium Mills