Hydro Cyclone
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“IN THE NAME O F ALLAH THE MOST BENAFICIENT THE MERCIFUL”
Presentation On:
Hydrocyclone
Introduction:
This is the continuously operating classifying device that utilize centrifugal force to accelerate the settling rate of particles. This device is of great importance in minerals industry because it is extremely efficient at fine separation sizes. It is widely used in closed-circuit grinding operations.
Introduction (cont…) It
has replaced mechanical classifiers in many applications as it is also used for de-sliming, de-gritting and thickening. It is simple and have high capacity relative to its size. A variant “water-only-cyclone” has been used for the cleaning of fine coal and other minerals.
They
can classify over a very wide range of sizes.Typically from 5-500um, smaller diameter units being used for finer classification.
CONSTRUCTION: A
typical hydrocyclone consists of a conically shaped vessel. It is open at its apex or underflow, joined to a cylindrical section which has tangential feed inlet. The top of the cylindrical section is closed with a plate through which passes an axial mounted overflow pipe.
Construction (cont…) The pipe is extended into the body of the cyclone by a short removable section known as the vortex finder,which prevents shortcircuiting of feed directly into the overflow. The bottom of the vortex finder protrudes below the feed chamber. The feed chamber and the cones are lined inside with the rubber or synthetic linings due to the abrasive nature of most metallurgical slurries.
Construction (cont…) The
lined material is hard rubber, neoprene or urethane. The apex is fitted with a concentric hardwearing synthetic rubber. Hydrocyclones are occasionally provided with a nozzle just above the apex for injecting the water to compensate for water loss of fines.
Working: The feed is introduced under pressure through the tangential entry which imparts a swirling motion to the pulp. This generates a vortex in the cyclone with a low pressure zone along the vertical axis. An air core develops along the axis,normally connected to atmosphere through the apex opening.
Working (cont…) The classical theory of hydrocyclone action is that particles within the flow pattern are subjected to two forces. a) Outward centrifugal force. b) Inward drag force. These forces accelerate the setting rate of particle. So, particles separate according to their size shape and specific gravity.
Working (cont…) Faster
settling particles moves to the wall of the cyclone where the velocity is lowest and migrate to the apex opening. Due to the action of the drag force the slower-settling particles moves towards the zone of low pressure along the axis and are carried upward through the vortex-finder to the overflow.
Regions for similar size distribution: Experimental work reported by “Renner” and “Cohen”(1978) has shown that classification does not takes place throughout the whole body of the cyclone. Using a high speed probe,sample were taken from several selected positions within a 150 mm diameter cyclone,and were subjected to size analysis.
The results showed that the interior of the cyclone may be divided into four regions that contains distinctively different size distribution.
Unclassified feed exist in a narrow regions A adjacent to the cylinder wall and the roof of the cyclone. Region B occupies a very large part of the cone of the cyclone contains fully classified coarse material (under flow product). Similarly fully classified fine material is contained in a region C(a narrow region). Only the toroidshaped region D does classification takes place. The cyclone was run at low pressure ,so that region D may be larger in production units.
Hydrocyclone
are almost universally used in grinding circuits because of their high capacity and relative efficiency. They are also classified over a very wide range of sizes(5—500 micro meter),smaller diameter are use for finer classification.
Presented by: Ali Haider Mustajab Faisal Shahzad Jutt Rai Ajrar Husain Faizan Ali Ghauri
MME-O7-26 MME-07-30 MME-07-20 MME-07-29
Presentation On:
Hydrocyclone
Introduction:
This is the continuously operating classifying device that utilize centrifugal force to accelerate the settling rate of particles. This device is of great importance in minerals industry because it is extremely efficient at fine separation sizes. It is widely used in closed-circuit grinding operations.
Introduction (cont…) It
has replaced mechanical classifiers in many applications as it is also used for de-sliming, de-gritting and thickening. It is simple and have high capacity relative to its size. A variant “water-only-cyclone” has been used for the cleaning of fine coal and other minerals.
They
can classify over a very wide range of sizes.Typically from 5-500um, smaller diameter units being used for finer classification.
CONSTRUCTION: A
typical hydrocyclone consists of a conically shaped vessel. It is open at its apex or underflow, joined to a cylindrical section which has tangential feed inlet. The top of the cylindrical section is closed with a plate through which passes an axial mounted overflow pipe.
Construction (cont…) The pipe is extended into the body of the cyclone by a short removable section known as the vortex finder,which prevents shortcircuiting of feed directly into the overflow. The bottom of the vortex finder protrudes below the feed chamber. The feed chamber and the cones are lined inside with the rubber or synthetic linings due to the abrasive nature of most metallurgical slurries.
Construction (cont…) The
lined material is hard rubber, neoprene or urethane. The apex is fitted with a concentric hardwearing synthetic rubber. Hydrocyclones are occasionally provided with a nozzle just above the apex for injecting the water to compensate for water loss of fines.
Working: The feed is introduced under pressure through the tangential entry which imparts a swirling motion to the pulp. This generates a vortex in the cyclone with a low pressure zone along the vertical axis. An air core develops along the axis,normally connected to atmosphere through the apex opening.
Working (cont…) The classical theory of hydrocyclone action is that particles within the flow pattern are subjected to two forces. a) Outward centrifugal force. b) Inward drag force. These forces accelerate the setting rate of particle. So, particles separate according to their size shape and specific gravity.
Working (cont…) Faster
settling particles moves to the wall of the cyclone where the velocity is lowest and migrate to the apex opening. Due to the action of the drag force the slower-settling particles moves towards the zone of low pressure along the axis and are carried upward through the vortex-finder to the overflow.
Regions for similar size distribution: Experimental work reported by “Renner” and “Cohen”(1978) has shown that classification does not takes place throughout the whole body of the cyclone. Using a high speed probe,sample were taken from several selected positions within a 150 mm diameter cyclone,and were subjected to size analysis.
The results showed that the interior of the cyclone may be divided into four regions that contains distinctively different size distribution.
Unclassified feed exist in a narrow regions A adjacent to the cylinder wall and the roof of the cyclone. Region B occupies a very large part of the cone of the cyclone contains fully classified coarse material (under flow product). Similarly fully classified fine material is contained in a region C(a narrow region). Only the toroidshaped region D does classification takes place. The cyclone was run at low pressure ,so that region D may be larger in production units.
Hydrocyclone
are almost universally used in grinding circuits because of their high capacity and relative efficiency. They are also classified over a very wide range of sizes(5—500 micro meter),smaller diameter are use for finer classification.
Presented by: Ali Haider Mustajab Faisal Shahzad Jutt Rai Ajrar Husain Faizan Ali Ghauri
MME-O7-26 MME-07-30 MME-07-20 MME-07-29
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