SBM Vertical Mill

Vertical Mill's Many Products and Final Particle Size Distribution

The vertical mill uses a hydro-pneumatic system to press its grinding rollers against the material bed on the rotating grinding table.

The grooved roller profile has two grinding zones, an inner and an outer. This creates a high and concentrated grinding pressure on the outer path, allowing air to escape into the grooved centre. The inner path serves to prepare the grinding bed, by compressing the feed material as it moves under the rollers into the high pressure grinding zone.

Segmented roller wear parts are made of the hardest possible material without risk of cracking and are very well suited for hard facing. Moreover, the segments are reversible, so their full width can be utilised. These features ensure maximum longevity.

The vertical mill efficiently grinds blended cements, with a wide range of additives such as slag, puzzolana, limestone and fly ash. Its versatility is demonstrated by the ability to switch between a wide variety of mixes, and to vary the particle size to meet individual needs.

Examples of adjustments of particle size distribution when grinding to the same Blaine surface. The required steepness of the particle size distribution curve is attained by adjustment of the separator rotor speed, the mill airflow rate and the grinding pressure, in combination with the appropriate height of the dam ring.