Breedon is one of the leading construction materials groups in Great Britain and Ireland. They produce cement, aggregates, asphalt, ready-mixed concrete, Welsh slate and specialist concrete and clay products, and offer a range of contracting services.
Breedon Quarry is the sole producer of the acclaimed Breedon Golden Amber Gravel, the most prestigious self-binding solution for perfect pathways and driveways and the only self-binding gravel to hold The Royal Warrant. The Royal Warrant, a mark of recognition given to suppliers of goods and services to the royal court. Breedon Golden Amber gravel is a natural limestone graded 0.47″ (12mm) to fines, quarried exclusively at Breedon on the Hill in Derbyshire.
At Breedon Quarry valuable aggregates need to be extracted close to the nearby community of Breedon on the Hill. After reaching the limits of drilling and blasting that could be done without creating excessive vibration and dust implications for the surrounding environment, Breedon needed to find another viable solution.
Initially water was used to try and suppress the dust. This was not an effective approach as water tended to push the fine dust particles aside rather than soak into them, so any wind spread the dust particles across the neighbouring community as opposed to suppressing it to the ground.
When rock excavation specialists AJ Gammond were approached to work at Breedon Quarry, Managing Director, Bruce Gammond was aware of the challenges that would be faced regarding dust control.Having seen Grydale mobile dust collectors being successfully paired with Surface Miners to manage dust within Tunnelling and Mining in Australia he was able to provide an innovative solution.
AJ Gammond are currently the only contractor in the UK with a Tesmec Rock Hawg and they proposed to pair this with the Grydale JMS-30-MDT (Mobile, Diesel Track) dust collector to enable positive excavation efficiencies along with an effective dust control solution.
How does the mobile dust collector work?
Grydale mobile dust collectors features a centrifugal fan that pulls the dirty air from the cutting drum through the intake. Larger, heavy dust particles drop through the patented drop-put box and are separated from the air stream. Dust and fumes are trapped on the filters and form a ‘cake’ on the surface as the air passes through the filter house. The reverse pulse filter cleaning system uses onboard compressed air to clean the filters. Heavy (non-airborne) dust particles are discharged from the dust collector via the hydraulic auger and rotary valve.
The clean air exhausted from the dust collector a certified filtration efficiency of 99.99% at 0.067 micron.
Benefits of the Rock Hawg for excavation
The Rock Hawg features a 3D guidance system to manage extraction levels more effectively. This allows the layout of the excavation area to be optimized and layers to be excavated in a precise way.
The Rock Hawg excavates on a continuous basis as it tracks across the surface of the quarry, the multiple cutting picks break-up the surface to a depth of 450mm. The JMS-30-MDT is connected by flexible ducting to the Rock Hawg and both units are able to track in unison.
The excavation process of the Rock Hawg breaking through rock creates a huge amount of dust and without the dust collector, visibility for operators would be severely impaired by the dust which would result in a significant safety issue.
The JMS-30-MDT is operated via a remote control, meaning the operator can stand in a safe location with good visibility of the work area while operating the unit.