Description
The Application of Vertical
Roller Mill:
vertical roller mill
is the equipment specializing in
producing fine and superfine powder of non-inflammable,
non-explosive and brittle materials with Mohs’s hardness under six,
such as calcite, chalk, limestone, dolomite, kaolin, bentonite,
talc, mica, magnesite, illite, pyrophyllite and vermiculite,
sepiolite, attapulgite, rectorite, diatomite, barite, gypsum,
alunite, graphite, fluorite, rock phosphate, kalium ore, pumice,
etc., totally more than **0 kinds of materials.
Vertical roller
millmainly consists of main
unit, classifier, powder collector, dust cleaner, blower, muffler,
sound-proof room, crusher, bucket elevator, storage hopper, and
vibrating feeder.
Working principle of vertical
roller mill:
After crushed by hammer crusher, the
large materials become small ones and are sent to storage hopper by
elevator, edge of then evenly sent to the upper distribution plate
of the turnplate by vibrating feeder and sloping feeding pipe. When
the grinding mill is at work, all the grinding rollers are rolling
in the ring, and the materials are driven to the edge of the
turnplate by the centrifugal force and fall down into the grinding
chambers where the materials are repeatedly pressed, crushed and
grinded by the rollers. The high-pressure air blower constantly
inhales air within the grinding mill and, in turn, the air
flow with crushed materials are brought to the classifier whose
high-speed impeller will screen the airflow: the unqualified
particle size will fall and return to the mill for being reground
while the qualified particle size mixed with air will go into the
cyclone powder collector. Most of the qualified powders will fall
an exit from the discharging valve at the bottom; a small
proportion of the fine powders, with airflow, moves to the dust
cleaner, and clings to the surface of the filter bags. At the same
time, the fine powders clinging to the surface fall down by the
sudden vibration of the filter bags, which is caused by the
instantly ejected high-pressure gas controlled by the pulse valve.
The materials from the above two lots are sent by the conveyor at
the bottom to get finished powders packed. In addition, filtered
clean air will be emitted from the air outlet of muffler in the
end.
Features of vertical roller
mill
1. High
efficiency
Under the same finished final size and
the same motor power, the capacity of micro powder grinding mill is
twice as much as jet mill, mixing grinder and ball
mill.
2. Long
lifecycle of spare parts
The ring and roller are forged by
special material with high utilization. Under the same grinding
material and finish special size, the lifecycle of spare parts is
about one year, which is **3times longer than impact mill or turbo
mill. Furthermore, the lifetime can reach **5 years for grinding
calcite carbonate.
3. High
safety and reliability
As no rolling bearings or screws in
grinding cavity, there are no problems caused by bolts shedding or
rapid wear of bearings and seal components.
4. High
fineness and flexible adjustment
The final fineness of the grinding
materials can be adjusted between **5 meshes and ***0 meshes, and
the product fineness can reach D*7≦5um.
5. Environment-friendly
The application of pulse deduster and
muffler greatly alleviates dust pollution and noise.
