Plasterboard Recycling - Airknife Separation
Impact Air Systems were contacted by Hamilton Waste & Recycling Ltd, operating in extensive waste collection and recycling facilities in East Lothian.
David Hamilton, director of Hamilton Waste & Recycling commented:
The 5-15mm, 15-25mm and >25mm waste streams are conveyed to pulverisers for further processing. Prior to reaching the pulverisers an Airknife assembly is installed at the transfer point between each of the waste stream conveyors and the pulveriser feed conveyors. As the material passes through the high velocity jet from the Airknife, the lighter paper particles are thrown towards the capture hood, which in turn removes them from the waste stream. The heavier gypsum product then passes through the pulverisers which release any paper still attached to the gypsum. The pulverised material is then passed through the system again to remove the paper.
Each Airknife is connected to a high efficiency backward curved fan which is 85-90% efficient thus minimising energy consumption. The fans are also fitted with frequency invertors which allow the velocity at the Airknife to be adjusted to give the optimum material separation.
The paper extracted by the capture hoods is conveyed through a range of ductwork to a rotary separator which removes the paper from the airstream and discharges it into skips. The dust laden conveying air is then cleaned by passing it through a reverse jet filter before being exhausted to atmosphere. In addition, a centralised dust extraction system was also connected to the reverse jet filter. This was designed to contain the dust produced during the screening, conveying and pulverising operations.
Again, with energy conservation a priority, the main dust extract fan was located on the clean side of the filter allowing a high efficiency backward curved model to be selected.
The system was installed on time and within budget and has been operating successfully since installation.
Visit Hamilton Waste & Recycling.