Tyrone International Ltd., Ireland, has been awarded a plant contract by London-based RMS Group to install a new recycled aggregate washing plant, which includes a full water treatment system and a 20-meter long Fraccaroli & Balzan, Italy, filter press.
RMG Group was established in 2007 and focuses on offering complete material supply management for the demolition, construction and groundworks industries.
The company now operate five recycling centers within East and South London and currently have a fleet of 100 trucks. Their services include the supply of crushed aggregates, washed aggregates, tipper hire, grab lorries, ‘rollonoff’ lorries, skip hire and dust carts.
As reported by HUB-4, RMS had a small washing plant at its site but were looking to significantly increase their production and produce a greater range of products and have zero aggregates going to landfill.
After viewing a number of plants, it was suggested that Tyrone would be the company to talk to. Following a consultation and numerous site visits, Tyrone was chosen for the plant contract.
“Tyrone took us to a previous installation which we were overly impressed with and on the basis of the build quality and their knowledge we subsequently gave them the contract to supply and install a turnkey solution,” the owner of RMS told HUB-4. “The whole investment is down to the realization of the opportunities and a way of dealing with a problem by reducing landfill.”
The new recycled aggregate washing plant is processing a combination feed of recycled materials, including utility waste, trommel fines, and varying quantities of sand or silt. The material is based on an all-in aggregate feed, using a Tyrone twin-screen scalper, which scalps off the 50-millimeter (mm)-plus with the 50-mm-minus being fed up the primary feed conveyor.
Material passes under a belt magnet and is then fed onto a pre-screen to remove the 5-mm-minus sized sand. The remaining 5mm to 50mm sand is then fed forward into a twin shaft log washer, which Tyrone says incorporates new design features, including ease of access for maintenance of all parts.
“Any fine sand collected from the pre-screen, trash screen, dewatering screen and the log washer is collected into a large sump tank which is situated under the log washer. It is then pumped to a Linatex cyclone which removes the majority of the silt; the underflow of this passes down to one side of a high-frequency dewatering screen which is fitted with spray bars. This washes the fine sand with any remaining silt passing through the deck and into a pump tank situated under the dewatering screen,” said Fintan McKeever, director of Tyrone.
All the trash material, polystyrene, plastics and small pieces of organics and wood exit the top of this cyclone with the silt, and then flow by gravity down to a large high-frequency dewatering screen fitted with stainless steel wedge wire. This removes all the 1-mm-plus trash material—keeping it out of the water treatment system—which is then deposited into a large skip.