Most crushing plants are now designed on the lines shown in Fig 1 which is a diagrammatic view of a two stage arrangement.
The ore from the mine is dumped in the coarse ore bin from which an automatic feeder delivers it over a grizzly to the primary breaker the latter being of the jaw type in the case of a small plant and of the gyratory type in the case of a large one The reduction ratiothat is the ratio between the inch size of the largest lump entering the machine and that of the largest piece leaving itis usually between 4 and 6 to 1 for either machine.
The undersize of the grizzly joins the product of the primary breaker and is transported by a belt conveyor to an intermediate bin from which an automatic feeder delivers it to an elevating belt conveyor discharging on to a vibrating screen The screen by passes any material fine enough to enter the grinding section and delivers the oversize to a cone crusher the discharge of which joins the undersize of the screen and is taken by a belt conveyor to the fine ore bin ahead of the grinding section.
For three stage crushing the preliminary stage is frequently a duplication of the first step of the two stage arrangement shown in Fig 1 but it is not uncommon for the first machine to be placed near the scene of mining operations if the mine is situated at a considerable distance from the flotation plant.
Fine crushing is of course a relative term Obtaining a final crusher product of minus 8221 is commonplace today and can occasionally be obtained in an open circuit final crushing stage.
Even when a crusher has the capability of achieving a high reduction ratio it is normally more efficient to run the crusher at a mid setting as shown in the manufacturers tables rather than choosing the closest setting which offers the greatest reduction ratio The main consideration at each stage for maximum production is efficient power draw.
Primary Crusher The Primary crusher8217s main purpose is to reduce large fragments of blasted or natural rock down to a size suitable for handling by transfer equipment and the secondary stage crusher Feed opening and product size ranges for the various models or Gyratory crushers are as follows.
A Maximum Feed Opening 1500MM to 750MM 5 ft to 2 ft b Recommended Minimum Product 162MM6 in.
Standard Secondary Cone Crusher Refer to Fig 1 The Standard Cone crusher is normally applied as a secondary crusher in a multi stage crushing circuit The small diameter feed distributor and the wide throat opening at the top of the liners enable the Standard Cone crusher to accommodate the larger feed produced by the Primary crusher.
The Portable Crushing Plant Supervisor is primarily responsible for assisting with daily production needs of a Crushing and Screen Plant In addition this position is required to assist with the.
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