Editorial Feature

Gyratory Crusher - Mining Fundamentals

A gyratory crusher is an ore processing machine that crushes the ore between an eccentrically mounted cone and a crushing throat, that is fixed. In mining, the most important criteria for effective crushing of ores is to choose the type of crusher that suits the rock (ore) material, and to ensure uniform feed.

Gyratory crushers are known for their high production rates, with a higher capacity than a jaw crusher. In order to get cubical material out of a gyratory crusher, it should be choke fed. Gyratory crushers are not suitable for crushing clay, as clay will clog the crusher.

Construction and Working of Gyratory Crushers

Gyratory crushers consist of a shell, which is sloping inwards, and a long spindle that is suspended from a bar at the top with the help of pivots. At the bottom of the crusher, the spindle is mounted atop an eccentric sleeve that enables spindle movement in a conical path around the shell.

The spindle is mounted in such a way that its head movement compresses the ROM between itself and the shell. The spindle is positioned such that it is free to pivot on its axis. When the head rotates around the spindle and the top part of the shell, the ore chunks are crushed.

Advantages and Disadvantages of Gyratory Crushers

Advantages

  • Big depth and higher productivity
  • Stable working
  • Full chamber feeding
  • Easy start, and handling hard and abrasive ore

Disadvantages

  • Massive structure
  • Cannot crush wet and sticky ores
  • Cumbersome installation and maintenance

References

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