Keestrack screening plant improves sand quality at Yorkshire quarry
A Keestrack Frontier 4518-S tracked mobile screening plant, supplied by CDP Plant Ltd, has been purchased by Johnsons Wellfield Quarries for removing soils and small stones from local sandstone before being transferred to a crusher.
As one of the UK’s leading producers of natural York stone, Johnsons Wellfield have a long heritage of producing quality dimension stone and a range of quarry products at their quarry in Huddersfield.
The decision to improve the quality of crushed products was key to purchasing the new screening machine, as Harry Kirk, quarry production and landfill manager, explained: ‘Our previous system linked to the crusher via a grid feeder was not producing satisfactory results.
‘The grid in the feeder had to be large to allow for wet conditions and a lot of stone fell to waste, thereby losing a large amount of saleable products. Another disappointment was that we could not guarantee that the stone fed to the crusher was clean and, ultimately, this had a detrimental effect on the quality of the building sands produced at the quarry.’
As a result, CDP Plant Ltd were approached by Mr Kirk to recommend a solution that would ensure the quarry operator’s saleable products were free from contamination. This could only be achieved if clean stone was fed to the crusher and that contamination was minimized at the primary stage size reduction. Trials of the Keestrack machine and a competitor’s product were, therefore, arranged on site to determine which mobile screening plant offered the best results.
‘We trialled the equipment for a week but straight away we could see that the Frontier was a stronger machine that offered greater working life expectancy,’ said Mr Kirk. ‘It also coped much better with the large stone pieces that are potentially quite damaging. Without hesitation, we placed an order with CDP Plant and have been very pleased with the performance of the Frontier 4518-S. It is strong, reliable and works well under arduous conditions.’
Once the screening plant has separated soils and small stones from the sandstone, the clean rock passes through a series of crushers and sieves to produce different sized materials, while a 2mm piano wire sieve produces quality building sand. The Frontier screens the waste from the virgin rocks into scalpings and a subsoil mix for land restoration.
Mr Kirk says he has been impressed by the after-sales service from CDP Plant. ‘The machine runs for 8h a day, operating four or five days a week, and CDP Plant always respond efficiently to supply spare parts, service calls or any advice we may need,’ he commented.
CDP Plant Ltd, Dunston Road, Sheepbridge, Chesterfield, Derbys S41 9RL; tel: (01246) 269450.