The Customer
Blue Scotland customer, Central Demolition, undertake the full range
of processes to form a closed loop scenario, from demolition and
dismantling to managing that waste stream and onto the creation of
saleable material to be put back into the construction industry. All this
takes place at their constantly expanding facility based in Bonnybridge,
near Falkirk. The business was set up by Ross Craig and Colin Peat in
1993 with the businessmen still at the helm today, managing over 190
employees across the company.
The Challenge
Central Demolition had a Powerscreen
washplant installed in 2011 to process the
C&D material that was coming into the site.
Initially the material was hand-picked and
fed into a crusher before it was screened
to <40mm. This process was not only
laborious but also placed employees in the
vicinity of moving heavy equipment. There
were clearly health and safety concerns
as well as proving very challenging for the team as
they were exposed to the elements.
Furthermore there was also the remaining
material which was going to landfll and
falling within the higher landfll tax bracket.
The Solution
Blue Scotland called upon sister company,
BlueMAC Manufacturing to help them
design a plant which could address all of
these challenges. The MRF would automate
much of the manual element within the
process, maximising recovery rates and
minimising volumes to landfll. It would
also place the employees in safe working
environments and help ensure high levels of
productivity.
The Process
- Initially the material is fed onto a 8m BlueMAC incline conveyor which feeds a screenbox to separate the material into three sizes -10mm pit sand/as dug is used for bedding pipes and for general building works 10mm-75mm goes directly to a 1000 Maxtrak cone crusher +75mm moves forward to a 4 bay picking station where wood and metal are removed. The metal is sold on to metal reprocessers, while the wood is used for biomass and fibreboard production
- The remaining material from the picking station then moves forward to an overband magnet and blower which removes any remaining ferrous and light material before it joins the 10mm- 75mm extracted from the screenbox in the 1000 Maxtrak cone crusher.
- The <40mm created by the crusher is fed into the washplant, initially moving through a scrub with a paddle system
- The material gets cleaner as it moves up the system with the dirty water going through a Finesmaster to extract the sand. The sand is used for used for landscaping and building projects
- The remaining clean material is separated via a Powerscreen Chieftain into 3 sizes, 5mm-10mm, 10mm-20mm and 20mm-40mm. Each of these sizes are utilised within major housebuilding and construction sites
