3. Cyclone dense medium separators have now become
widely used in the treatment of ores and coal.
Much finer separations to be achieved than in
gravitational separators.
Feed to these devices is typically de-slimed at about
0.5 mm.
Good separations can be achieved for coal particles as
fine as 0.1 mm, below this size separation efficiency is
very low.
Introduction
5. Large Coal Dense Medium Separator.
It is used for large coal.
Its capacity is 250th -1
Its diameter is 1.2 meter and length is 3 meter
Treatment of raw coal up to 100mm.
It consist on cylindrical shell inclined on 30 degree to
horizontal.
LARCODEMS
6. Working Mechanism
Feed medium of required density
is introduced under pressure by
pump.
At the top end of vessel is a
involute tangential outlet
connected to the vortex tractor
Raw coal of 0.5 to 100 mm is
feed in by the chute.
High relative density particles
pass rapidly to the separator wall
and are removed through the
top involute out let and the
vortex tractor
7. Vorsyl Separator
Coal Preparation plant.
Treatment of small coal size about 50mm.
Its capacity is 120th -1.
The Separating medium is magnetite (Fe2O3).
It separate the material on the basis of specific gravity.
8. Working Mechanism
The material is introduced by
an involute.
The material of specific gravity
less then that of medium
passes in to the clean coal
outlet via vortex finder.
The higher gravity materials
move to the wall of vessel due
to centrifugal acceleration.
The movement of particles is
spiral .
9. Used for treating fine coal diamonds, fluorspar, tin,
and lead-zinc ores, in the size range 0.5-30 mm
Its capacity is 100 t h -1
Its maintenance cost is low.
Its operating cast is lower because only material is
pumped.
It has much sink capacity.
Dyna Whirlpool separator
10. Working Mechanism
It consist of a cylindrical shell
having identical tangential inlet
and outlet sections at either end.
The unit is operated in an inclined
position and medium of the
required density is pumped under
pressure into the lower outlet.
The rotating medium creates a
vortex throughout the length of
the unit and leaves via the upper
tangential discharge and the lower
vortex tube.
11. Working Mechanism
Raw feed entering the upper
vortex tube.
Float material passes down the
vortex and does no contact the
outer walls of the unit, thus
greatly reducing wear.
The float discharge from lower
vortex tube.
The heavy sink particles of the
feed penetrate the rising medium
towards the outer wall of the unit
and are discharged with medium
through the sink discharge pipe.
12. The Tri-Flo separator is regarded as two Dyna
Whirlpool separators joined in series.
It is used in a number of coal, metallic ferrous, and
non-metallic ore treatment plants.
Its capacity Is high than Whirlpool .
Tri-FIo separator
13. Working Mechanism
Involute medium inlets and sink
outlets are used, which produce less
turbulence than tangential inlets.
The device can be operated with two
media of differing densities in order to
produce sink products of individual
controllable densities.
Two-stage treatment using a single
medium density produces a float and
two sinks products with only slightly
different separation densities.
14. Working Mechanism
With metallic ferrous ores, the
second sink product can be regarded
as a scavenging stage for the dense
minerals.
The second product is re crushed ,
and, after de-sliming, returned for
retreatment.
The separator is used for washing
coal, the second stage cleans the
float to produce a higher grade
product.
Two stages of separation also
increase the sharpness of separation.
