Modern Quarrying Q4 2020

ON PHOTO: PILOT CRUSHTEC SCREEN Screen technology is penetrating into ever finer size ranges.

FINE SCREENING

THE ADVENT OF DRY SEPARATION IN FINE SCREENING

KEY TAKEAWAYS

Hydrocyclones have traditionally been preferred to meet fine separating cut requirements, while screen systems and other separation methods have generally been used for the size range above that. However, this convention now appears to have lost its validity, with dry technologies such as screens and air classifiers gaining the edge in finer size ranges. By Munesu Shoko. D iverse classification methods are used in quarrying and mining applications. Hydrocyclones have historically been the go-to solution for fine separating cut requirements. However, other technologies such as fine screen technology and air separators are challenging the status quo, and are penetrating into ever finer size ranges. Jorge Abelho, director – Technical Support at Pilot Crushtec International, reasons that traditional mining makes use of wet processing technologies such as hydrocyclones to remove fines from products. With the global push to reduce the

Hydrocyclones have historically been the preferred solution for fine separating cut requirements

Traditional mining makes use of wet processing technologies such as hydrocyclones to remove fines from products. With the global push to reduce the environmental impact, new and more efficient dry technology is gaining favour

In future, air separation will play a major role in fine screening – there is no need for water or any subsequent costly treatment of wastewater

Air classifiers separate and recover ultrafine, fine and coarse materials in mining, aggregates production, sand manufacturing and other industrial processes

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MODERN QUARRYING QUARTER 4 - 2020