lecture 1
TRANSCRIPT
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Prof.Dr.Salah ElmoftyPh.D.professor
Material TechnologyDepartmentofMiningPetroleum&Metallurgical,
Faculty Of Engineering
E-mail:[email protected]
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Lecture:1
Comminution
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Comminution
-Ore minerals are usually finely disseminated and intimately associated with gangue minerals.
-These minerals should be liberated before concentration.
-This liberation accomplished by comminution.
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-Communiation is one of the primary operations in mineral dressing
ComminutionComminution
CrushingCrushing GrindingGrinding
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Crushing
Feed size ranging from 3” to 30” can easily be handLed
The feedsize in all this cases varies
from 1.5” to 6”
Primary Secondary crushing crushing
Jaw crushers & Gyratory crushersCone crusher
& Roll crusher
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Blake crushers
These crushers built in many sizes
-The largest boluldr is 4 feet in diameter
-SmallestTakes feed around 3 to 4 inches
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Primary crushers
Jaw crushers Gyartory crusher
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Blake crushers
Constraction:
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Liners:
-The material used for lining the
jaw plates and check plates.
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Jaw crushers:
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Characteristics of jaw crushers:
1-They are working little than half the time.
2-Because of heavy flywheel and high speed of rotation they are favourable to more efficient action of jaw crushers.
3 -Rate of oscillation of the moving crushing surface determines the machine capacity
ordinary taper 4.5 per foot
4-Have less capacity than gyratory crushers
5-Work in open circuit with double deck screen
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Gyratory crushers
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Characteristics of gyratory:
1-Capacity is greater than jaw crushers.
2-Required power less than jaw. crushers.
3-There is less vibration in operating .
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Wich of the two following crushers we should choose for small
capacity? & why?
Gyartory crusher Jaw crusher or
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Jaw crusher is the better choice because of:
1-Jaw crusher can take larger size than gyratory &is better adopted to handle clayey &spongy rocks.
2-Gyartory crusher consume more power for the same feed as produces more new surfaces than jaw crusher..
3-Installation and housing costs will be more compared to jaw crushers.
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Secondary crushers
Cone crusher Roll crusher
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Cone crushers1-Cone crusher is secondary crusher.
2-Product of cone crusher is the feed of grinding mill.
3-It work in closed circuit with double deck screen.
4-Product is more uniform in size.
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Cone crushers
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Merits of cone crusher over gyratory
1-Cone crusher moves faster than gyratory .
2-Rapid discharge of crushed material due to increase space from top to
bottom .
3-Hier capacity and reduction ratio than gyartory crushers.
4-Work in closed circuit.
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Roll crusher
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Roll crusher
1-Used for crushing relatively soft materials like coal & salt.
2-Capacity is high and reduction ratio is large.
3-Can not produce fine product owing to the spacing between adjacent teeth.
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Angie of nip
.
N
E
aaC D
C,D Rolls
E sphere of rocks
N angle of nip
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Comparison between roll & cone crushers:
1-Roll crusher production smaller of fines than cone crushers and smaller reduction ratio.
2-Rolls,because of theirinability to yield ahigh reduction ratio,have not been installed in recent years.
3-Reduction ratio for rolls should not exceed
4:1 similar to cone crushers.
4-Rolls remain to be the best device for intermediate crushing.
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THANK YOUTHANK YOUTha
nk yo
u
Thank
you
Prep
ared
by
Prep
ared
by::
Prof
. Dr.
SALAH
ELMOFTY