Centrifugal separators

Muhammad Zubair MME-12-29

M. Faisal Maqsood MME-12-20

Gulfam Hussain MME-12-30

Arif Ali MME-12-01

Group No 1

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

LARCODEMS Vorsyl Separator Dyna Whirlpool separator Tri- FIo separator

Types of Centrifugal Separator

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

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.

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.

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 .

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

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.

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.

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

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.

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.

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