Modern Quarrying Q1 2019

Impact crushers can be classified as primary/ secondary crushers or secondary/tertiary crushers.

KEY TAKEAWAYS

screening aspects can be designed aligned with this,” explains Van Rensburg. Tyron Ravenscroft, Finlay Product Manager at Bell Equipment, says without crushing, very little aggregate would be produced from purely using explosives to blast the natural rock. “Therefore the crushing stage is a vital necessity to be able to produce high quality aggregates. However, screening the crushed material is just as important to be able to produce the different aggregate sizes, which then become a valuable and sellable product,” says Ravenscroft. Johann Pruewasser, engineer at Keestrack, says the importance is extremely high because the crushing stage influences the overall quality of the final product. He adds that the costs of processing are mainly dependent on the crushing system and the energy demand.

By tonnage, crushing is by far the largest process operation in aggregate processing

To execute the crushing process cost-effectively, it’s always important to deploy the correct crusher for the ideal application

Jaw crushers are typically used in a primary crushing station – to take the run of mine and produce a feed to the secondary cone crushers

The VSI is a critical part in obtaining high specification road stone, or as a pre-milling crusher to increase mill throughput in mining applications

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QUARTER 1 - 2019 MODERN QUARRYING