Talking about a sand mill, a central bar agitates the sand, causing it to have a grinding action. Many sand mills produce very small particles on the first pass, with the particles passing through a mesh screen. Others have recapture systems, allowing people to pass the mixture through the sand mill again to make it finer and more even. The design works by agitating the sand, rather than creating pressure, ensuring that the grinding medium does not break apart in the device when it is used properly.
As the name implies, sands can be used as grinding media, but other materials may be used as well. The choice of medium depends on the material being ground. Some companies maintain several mills dedicated for specific uses, while others may change media as needed in a single sand mill. Sand mills are used in cosmetics manufacturing, the production of paints and pigments, and similar activities.
In the case of mixtures, sand mills can be used to run a mixture of components through for processing into a uniform paste or powder. This is widely applied in the production of paints, where pigments need to be ground with stabilizers and other components before being blended with a base. As the ingredients pass through the sand mill, they become thoroughly mixed. The very fine grind offered by this device allows