The selection of the primary crusher

 The selection of the primary crusher is the key to the success of any operation that involves size reduction. Each of the various types of primary crushers is discussed. The material hardness, impact strength and abrasive index define which primary crushers are acceptable. Required capacity, feed and product sizes are considered to narrow the selection and define the physical size of the crushers. Once the acceptable primary crushers have been identified, the selection is furthei defined by above ground or underground location of the plant if the crusher is to be stationary of with some degree of mobility.
Definition of primary crusher selection

The primary crusher selection is the key to the success of the mining, quarrying or industrial minerals operation that involves the reduction in size of rock, ore or minerals. The crushing plans can be provided with almost any type of primary rock crusher.

    The rock/ore determines the type of crusher
    The plant capacity determines the size of the crusher

As the term "primary" implies these crushers are used in the first stage on any size reduction cycle. These crushers take blasted, run-of-mine, or run-of-quarry feed up to 1500 mm (60 inches) and produces a product ranging in size from -300 mm for conveyor transport, or -300 mm for SAG mill feed; to -38 mm when crushing soft, non-abrasive materials such as limestone. The primary can produce these sizes at a rate of 150 to 12,000 MTPH per hour depending on the feed characteristics, crusher setting and crusher size.
The family of primary crushers include the:

    Gyratory
    Double toggle jaw
    Single toggle jaw
    High speed roll crusher
    Low speed sizer
    Impactor
    Hammermill
    Feeder breaker