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A new way of applying the primary/secondary crusher circuit

Source:Henan Xingbang Heavy Machinery Co.,Ltd. Date:08/15/2013

Combining a larger horizontal shaft impact (HSI) crusher with a smaller secondary HSI crusher--is proving to be profitable for some aggregates producers, increasing production and decreasing wear costs in an array of applications.

Although some applications still call for the primary-jaw/secondary-cone circuit to reduce wear costs and maintain productivity, some producers say it's overkill for crushing many recycle and aggregate materials.

The HSI primary design, which delivers a higher percentage passing spec the first pass, crushes more efficiently than its jaw counterpart, some experts say, on a wider range of materials, including concrete and asphalt recycle, all soft and medium aggregates and many hard and abrasive aggregates. New thoughts and experiments focusing on the HSI primary, secondary circuit are producing positive real-world results.

This design makes possible a high production capacity by avoiding the accumulation of fine material (sometimes mud or clay) at the bottom end of the crushing chamber. The layer of fine material separated by the grizzly feeder is fed on to the main conveyor belt before the drop point from the jaw crusher and reduces the impact from the larger stones on the belt, beneath the Jaw Crusher. The fine material and the crushed product are transported on the main conveyor.

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