Grundon – Kennetholme Quarry case study

After effective site surveys and consultations, Duo Group Holdings transformed a former paper mill works in Kennetholme, Berkshire converting it into a plant capable of processing flint-based sand and gravel at 150 tph, to produce sharp sand products in 10mm, 20mm, 40mm and +40mm oversize.

Material source:

Flint-based sand and gravel, dumptruck or loading shovel fed from a reserve containing a 10-year supply.

Equipment installed:

  • 30 tonne capacity feed hopper with remote control tipping grid (4″ grid spacing) and variable speed drag out belt
  • 24 metre-long inclined troughed belt feed conveyor
  • 16 x 5 double-deck rinsing screen
  • Powerscreen Logwasher with twin shafts, interchangeable high tensile blades and built-in agitation system
  • Powerscrub with an elevated spray bar
  • 6 x 2 dewatering trash screen fitted with polyurethane modules
  • Powerscreen Finesmaster 120 with rubber lined Linatex cyclone, fixed spigot and rubber lined Linatex centrifugal pump

Project requirements:

The primary objective was to regenerate and facilitate an existing paper mill site to create a new wash plant for processing ‘as-dug’ material and to suitably replace Grundon’s closing operation at nearby Padworth Quarry.

Duo’s solution:

To devise an installation comprising new specialist Duo equipment, supported by existing machinery already in place at the former paper mill that would present the most effective client solution for Grundon.

Using a capacity feed hopper, variable speed drag-out belt, inclined troughed belt feed conveyor, and double deck rinsing screen, we created an integrated system designed to appropriately separate, sort, rinse, powerscreen, agitate and scrub ‘as dug’ materials. The system succeeds in effectively grading sizes of gravel and sand and self-regulates the collection sump so de-watered sand can be stockpiled, before waste water from the sand classification unit is pumped into a nearby lagoon.

Project success:

Demonstrating ingenuity and a comprehensive understanding of how plant can be combined and integrated, Duo has created an effective plant solution, utilised existing and functioning apparatus, and delivered an alternative processing operation with the capacity to perform.

Ken Branigan, Aggregates General Manager commenting on the project said, “Duo installed the plant in a very efficient and professional manner, paying specific attention to Health and Safety.”