Size Reduction Equipments

Principal Forces in Size Reduction

  • Impact—particle concussion by a single rigid force.

  • Compression—particle disintegration by two rigid forces. Compression is the characteristic action of crushers.

  • Shear—produced by fluid or particle-particle interaction.

  • Attrition—arising from particles scraping against one another or against a rigid surface.

Classification of Crushing and Grinding Machinery

  • Coarse crushers: jaw crusher, gyratory crusher.

  • Intermediates: roll crusher, hammer mills.

  • Fine grinders: ball mills, rod mills, ultrafine grinders.