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Review of the last lesson

Secondary Crushers

The cone crusher is a modified gyratory. The essential difference is that the shorter spindle of the cone crusher is not suspended, as in the gyratory, but is supported in a curved, universal bearing below the gyratory head or cone .

The mode of operation of roll crushers is extremely simple, the standard spring rolls consisting of two horizontal cylinders which revolve towards each other. In impact crushers, comminution is by impact rather than compression, by sharp blows applied at high speed to free-falling rock.

The rotary coal breaker is very similar in operation to the cylindrical trommel screen, consisting of a cylinder of 1.8-3.6 m in diameter and length of about 1.5 to 2.5 times the diameter, revolving at a speed of about 12-18 rev min-1.

Lesson5

Grinding mills

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