Vertical raw mill is a type of industrial equipment used to crush or grind materials into small particles. Vertical roller mills are widely used in the concrete and mining fields, and are also used to process gypsum. These units can process both raw and recycled materials, while helping to reduce waste and preserve virgin supplies of these materials.

High-performance separator and optimised airflow ensure high separation efficiency and low pressure loss for energy saving.

Unusually large rollers permit coarse feed and ensure a thick grinding bed for maximum uptime.

All impact forces and dynamic reactions are small and vertical therefore easy to accommodate – prevents mill stops.

Segmented wear parts for table and rollers allow use of the most wear-resistant materials and hardfacing for long life.

Reversible roller segments ensure high material utilisation.

External circulation limits power consumption of fan.

Feed sluice ensures low false air flow and steady feed flow for minimum power consumption and optimum mill production.

The raw mill is easily adaptable to high airflow required by especially wet easy to grind materials.

It's from http://www.great-wall.co/products/vertical-roller-mill/vertical-raw-mill.html#.VRN5W_mUfNc.