10-06-2017, 06:41 AM
OK vertical roller mill
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Operating advantages
The rollers are in a lifted position when
the mill is started, ensuring trouble-free
start-up. This eliminates the need for an
auxiliary drive. A control system monitors
the machinery and facilitates operation.
Mill design for versatile applications, simple operation and long life
Mill arrangement
This schematic illustrates a typical
grinding installation. The arrangement
is very simple and the operation is
correspondingly flexible and reliable.
To maintain the appropriate temperature
in the mill circuit for example to
ensure adequate dehydration of the
gypsum when grinding cement the
layout is prepared with provisions for
recirculation of hot exit gas to the mill
inlet. In case the mill feed is wet slag
or includes a significant portion of wet
additives, additional heat must be provided,
for instance from a heat generator.
Otherwise, if the mill feed is very
hot, the mill exit temperature controls
a damper for cold air intake.
Nozzle ring bypass system
For slag grinding, a specially designed
nozzle ring bypass allows the iron
particles to segregate through nozzles
without airflow and subsequently be
removed by a magnetic separator to
minimise wear of the mill internals.
One mill, many products
The OK 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.