Page 8 - Hub-4 Magazine Issue 73

Aggregate
Washing Cover Story
PowerX installs new Aggregate Washing
Plant at Tarmac’s Block Fen Quarry
Located near Ely, Cambridgeshire, Block Fen Quarry has been the latest recipient of a new PowerX wash plant installation.
The operation now boasts a new electric plant which has been designed, supplied, and installed by PowerX Equipment.
The new plant features a Terex® Finesmaster 200 compact and a Powerscrub 200R Logwasher and is designed to operate at 250tph, with material feed being sand and gravel with some clay; silt content is 7%-10%. From this a sharp sand, and four clean aggregates 6/10/20/40mm are produced. All saleable products are within the EN12620 grading envelope.
A standard feature of PowerX plants is the ability to walk from one end of the plant to the other without having to backtrack on walkways, without the use of vertical ladders.
Production process:
As dug material is loaded by dump truck into a drive over hopper which feeds the 39m long inclined main feed conveyor, passing under a clay picker the material is then fed onto a 6.1 x 1.8m, two deck rinsing screen. Here the reject material and sand (which is sent to the Finesmaster), are taken out with the rest of the material fed into the twin-shaft Powerscrub 200R
logwasher where the blades convey the material from the feed end of the scrub to a 3.7 x 1.5m single-deck part rinsing screen.
Any organics such as roots are floated off to be dewatered over a 1.8m x 0.6m trash screen. Underflow from the trash screen is received in a catch box under the screen and then gravity fed to the sump tank under the hull. Any fines off the back end of the logwasher are sent to the Finesmaster.
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www.hub-4.com March-April 22 - Issue 73