July 27, 2015

Mining operations are one of the last pioneering ventures on our planet. They descend through geological strata in search of minerals and ore, leveraging modern scientific principles against hard rock and dirt. The crux of the work is located at the mine face, a rock-breaking zone where workhorse drilling and digging tools dispatch heaps of raw rock into steel-encased grizzly feeders. Although there’s no way we would ever want to steal the thunder from the heart of the mine, we do believe that screening and conveying is where aggregate matter is transformed into a marketable commodity. Let’s take a closer look at the types of screens that make this transformation possible.


An inclined mechanical screener with one express purpose, the delivery of a drip-free aggregate to the output stage. Counter-rotating motors produce linear motion, moving solid matter forward while funnelling muddy slurry into a channel. They’re used for dewatering, rinsing, scrubbing and degritting wet aggregate.


The primary screening of blasted rock passes across grizzly screens. The coarse matter crosses parallel steel bars or rails, moving across a 20 to 30 degree incline. The mechanism is usually fitted between a primary feeding mechanism and a crusher. The heavy-duty design focuses on extreme wear-resistance and an in-line flow build that aids in scalping. Manufactured from manganese steel and other high-impact alloys.


Possessing all of the hallmarks of a workhorse performer, horizontal screens use a number of swappable screen media attachments with varying aperture arrangements. The linear motion introduced into the screen by a twin pair of eccentrically-mounted motors sorts the particulate matter through one or more decks. Ideal for conveyance and size separation roles, tasks that separate tiny 45µm grains as well as they do 300mm chunks of rock when the appropriate screen media is installed.


This innovative screen type uses sloping decks to deliver a purported two or even threefold productivity gain over traditional screens. One possible drawback here is the need for different aperture sizes on each screen panel, hole sizes that must be varied to account for the change of angle the particulate matter experiences as it’s moved by vibratory action across the mechanism.

These core screen models are further multiplied by adding greater diversity to the designs. Some of these additions are set in the manufacturing facility, such as the size of the motors. Other modifications can be set at the mine. The oscillation speed of the motor can be changed here, as can the screen media. Look for abrasion-resistant polyurethane screen panels, wire mesh screens, slotted woven wire panels, stainless steel rectangular mesh screens, and much more. These client-set screens are designed to swap out and maximize the versatility of each screening mechanism.

Screening Technology Pty Ltd T/AS Hawk Machinery

Address: 7 Lantana St Blackburn North Vic 3130
Contact Person: Bohdan Blaszczyk
Phone: +61 3 9877 7777
Fax: +61 3 9877 8177
Mobile: 0411 099 989

Email: info@hawkmachinery.com.au

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