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Crusher guide The Complete Guide to Crushing Crushing is the reduction of large material into smaller sizes It is often one of the ?rst steps in any aggregate or mineral processing plant and is accomplished with various types of crushing equipment These m

The Complete Guide to Crushing Crushing is the reduction of large material into smaller sizes It is often one of the ?rst steps in any aggregate or mineral processing plant and is accomplished with various types of crushing equipment These machines employ various forces to reduce the material to the required size The crushing process can be accomplished in one or more stages ?? primary secondary tertiary and quaternary ?? and include a variety of crusher types Crusher Guide indd PM CCrushing Stages Primary Crushing The primary crushing stage is the ?rst stage in a crushing circuit The main goal with primary crushing is to reduce the raw material into a smaller size that can be easily transported on a conveyor belt for further handling downstream Primary crushers are sized to be able to accept large feed sizes without blocking or plugging Typical primary crushers in aggregate applications include Jaw Crushers and Gyratory Crushers due to their ability to reduce large lumps of material to smaller sizes but Impact Crushers and Hammermills can also be used in certain applications if the material is not overly abrasive In minerals processing applications Feeder-Breakers Roll Crushers and Sizers are typically found in the primary crushing stage Types of Primary Crushers Feeder-Breakers Gyratory Crushers Hammermills Impact Crushers Jaw Crushers Roll Crushers Sizers Secondary Crushing Secondary crushing also referred to as intermediate crushing further reduces the material for ?nal crushing or for ?nal product sizing Impact Crushers Cone Crushers and Hammermills are commonly used as secondary crushers in aggregate applications while Secondary Sizers and Double Roll Crushers are commonly used for the secondary size reduction of many minerals Types of Secondary Crushers Cone Crushers Double Roll Crushers Hammermills Impact Crushers Secondary Sizers Tertiary Quaternary Crushing Tertiary and quaternary are considered ?ne crushing stages but not every application will require them These stages focus on the quantity or capacity and quality particle size shape etc of the ?nal product Types of Tertiary Quaternary Crushers Cone Crushers Fine-Grinding Sizers Tertiary Sizers Roll Crushers Vertical Shaft Impact Crushers The Complete Guide to Crushing Crusher Guide indd PM CFactors That A ?ect The Crushing Process Feed Size When determining the feed size consider the realistic expectation of the feed not the biggest piece that could go through the plant A feed size that is too large can cause the top of the crushing chamber to wear faster than the bottom as well as decrease production if the feed opening becomes blocked by the oversize ? The type of material to be processed ? The feed size of the material A feed size that is too small can have the opposite e ?ect Undersized feed material will cause the majority of the crushing to take place in the lower portion of the chamber causing increased wear to the bottom of the chamber In this scenario production will also be decreased due to a poor reduction ratio ? The desired product size ? The expected capacity ? The reduction ratio Product