Screens & Feeders

High frequency screening: from piles to profit

Astec Australia is experiencing a renewed interest in high frequency screening technology, due to product innovations that allow high frequency screens to be used in a wider variety of applications.

The underlaying features of high frequency screens have remained constant, that is, their highly efficient ability to separate particles from around 25mm down to 0.425mm and the capability to handle wetter, stickier materials. What has now developed is the means at which this capability is deployed.

Astec has introduced the high frequency screen into different tracked and fixed systems, broadening the variety of applications that the high frequency screen can be used in.

Astec has now produced three track-mounted systems, to be used for a variety of applications. The FT2618VM is the system with the most runs on the board, as it typically runs in-line with Astec’s FT2650 tracked jaw crusher and FT300 tracked cone crusher as a final screen for producers wanting to screen for a specific manufactured sand profile. Recently, the high frequency range has increased to include the GT205 multi-frequency tracked screen and the GT165 multi-frequency tracked screen.

{{image2-a:r-w:300}}The GT205 is a direct feed screen with a conventional top deck to screen off top size overs but also includes high frequency technology on the second and third decks to allow a more efficient product cut.

Recent use cases have seen the GT205 being fed recycled gypsum, recycled glass and topsoil. The most intriguing use case has been the processing of otherwise waste material to produce low grade road base that meets local council specifications.

In all use cases, the GT205 has more than paid for itself from the value it has derived from producing higher value products from what was otherwise seen as waste.

Astec has recently launched the GT165. In this configuration, the multi-frequency screen with its mix of conventional screening on top deck and high frequency lower deck has been arranged for scalping. The benefits of using the multi-frequency configuration in the scalping function is that raw feed (larger rock) can be handled on the top side deck, while the second deck can run a much finer screen cloth that can handle a stickier type of materials often found in scalping applications.

Apart from mobile track-mounted applications, Astec has also sold different sized high frequency screens that have been mounted in a modular frame. With minimal dynamic loading, the structures are modest, robust and can be used for a wide variety of applications. The most common use cases for high frequency screens in static applications include operations processing crusher run of dust into manufactured sand.

To accommodate unique site requirements, static applications of high frequency screens can be configured with multiple decks and differing lengths and widths. One of the strengths of running the high frequency screen is the ability to change the screen angle, frequency and stroke of the individual screen decks. This control allows tuning of the screen to the properties and size of the material being screened, giving precise stratification and optimal screening outcomes.

To date the high frequency screen has been successfully used in manufactured sand, concrete stone, agricultural lime, recycled materials and topsoil. To assist producers in scoping the high frequency screen for their application, Astec offers a complimentary material testing service where customers can test their specific materials on a demo screen at the Astec head office in Brisbane, Queensland.

Source: Astec Australia

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