This document discusses different types of centrifugal separators used to separate materials of different densities. It describes Large Coal Dense Medium Separators (LARCODEMS), Vorsyl Separators, Dyna Whirlpool separators, and Tri-Flo separators. It provides details on the working mechanisms, capacities, and applications of each type of separator.

1. Centrifugal separators

2.  Muhammad Zubair MME-12-29
 M. Faisal Maqsood MME-12-20
 Gulfam Hussain MME-12-30
 Arif Ali MME-12-01
Group No 1

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

4.  LARCODEMS
 Vorsyl Separator
 Dyna Whirlpool separator
 Tri- FIo separator
Types of Centrifugal Separator

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.
 The low density particles passed by
centrifugal spiral action outside
through clean coal outlet.

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 separates 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.