Capital Equipment News June 2024

to offer a wide range of high-frequency screens to produce specification sand product with the use of minimal to no water,” Booyse says. “Dry clas sification is a process that

tion of up to 4200 rpm (for optimal screen efficiency and production). “Directly induced to the screen media, this allows for increased stratification and material separation. Screen efficiency is improved at high

has been used in the aggregates industry to manufacture specification sands

production rates as compared to conventional screens. Coars er material requires more amplitude and less frequency, while finer material requires less amplitude and

Dry classification is a process that has been used in the aggregates industry to manufacture specification sands for many years, but the technology has not been widely applied.

for many years, but the technolo gy has not been widely applied. However, it is now gaining trac tion globally as a

preferred solution in the global aggregate and mining sector.”

more frequency.” He notes that variable high frequency screens are more versatile to

Astec’s high frequency screens are engineered to provide higher production capacities and more efficient sizing when compared to conventional screens. High frequency screens feature aggressive vibration applied directly to the screen, providing a high capacity for the removal of fine material, as well as aggregate chip sizing and the production of dry manufactured sand. The frequency of the screen is mainly controlled by a vibrator. Its high-frequen cy characteristics differentiate it from a normal vibrating screen. High-frequency vibrating screens usually operate at an inclined angle and the hydraulic screen angle adjustment makes alterations quick and easy, reducing downtime. Booyse explains that Astec high fre quency screens utilise high-speed vibra

tackle varied material conditions such as particle size distribution. “They have higher efficiency due to the incremental increase in frequency. These screens can also be used effectively to process man ufactured sand for size segregation and for the removal of silt, which is typically 75 microns or below.” A further benefit offered by Astec’s high frequency screens is a unique tensioning system. Booyse says that this provides the quickest screen media changes in the market. “The easy and safe replacement of each screen section translates into less downtime for screen changes and increased operation time,” he stresses. b

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