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Lecture 1
 

Lecture 1

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    Lecture 1 Lecture 1 Presentation Transcript

    • Prof.Dr.Salah Elmofty Ph.D.professor Material Technology DepartmentofMiningPetroleum&Metallurgical, Faculty Of Engineering E-mail:s_elmofty@hotmail.com
    • Lecture:1 Comminution
    • 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.
    • - Communiation is one of the primary operations in mineral dressing Comminution Crushing Grinding
    • 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 crushers Cone crusher & Roll crusher
      • Blake crushers
      • These crushers built in many sizes
      -The largest boluldr is 4 feet in diameter -Smallest Takes feed around 3 to 4 inches
    • Primary crushers Jaw crushers Gyartory crusher
    • Blake crushers
      • Constraction:
    •  
    • Liners:
      • -The material used for lining the
      • jaw plates and check plates.
    • Jaw crushers:
    •  
    • 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
    • Gyratory crushers
    •  
    •  
    • Characteristics of gyratory :
      • 1 -Capacity is greater than jaw crushers.
      • 2 -Required power less than jaw. crushers.
      • 3 -There is less vibration in operating.
    • Wich of the two following crushers we should choose for small capacity? & why?
      • Gyartory crusher
      Jaw crusher or
    • 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.
    • Secondary crushers Cone crusher Roll crusher
    • Cone crushers
      • 1 -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 .
    •  
    •  
    • Cone crushers
    • 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.
    • Roll crusher
    • 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.
    • Angie of nip
      • .
      N E a a C D C,D Rolls E sphere of rocks N angle of nip
    • 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.
    • THANK YOU Thank you Prepared by : Prof. Dr . SALAH ELMOFTY