Page 36 - Hub4 Magazine Issue 51
P. 36

CDE equipment brings dormant Little Paxton quarry back to life
Aggregate Industries, a leading building materials and solutions company with more than 300 sites across the UK, has brought dormant Little Paxton quarry in Cambridgeshire back to life with a CDE wet processing solution installed in partnership with Aggregate Processing Solutions (APS).
The beginnings
Holding the Responsible SourceTM certification, Aggregate Industries was committed to developing the Little Paxton quarry according to strict environmental guidelines as the site is adjacent to Paxton Pits, a Local Nature Reserve (LNR) and a Site of Special Scientific Interest (SSSI). The quarry had been mothballed for six years and Aggregates Industries, through APS, identified CDE as its supplier of choice to maximise the site’s materials production potential.
As Aggregate Industries originally did not have an extension planning permission, the company opted to lease rather than purchase a wet processing plant, which it needed to be designed to very specific requirements. Aggregates Industries’ 10-year partner APS, which sells, contracts and hires processing equipment, was able to recommend CDE as the only company that could develop a fully bespoke, high- efficiency wet processing solution for Little Paxton. CDE would provide the technical solution and the equipment, which would be installed and operated on site by APS on a price- per-tonne basis.
Expectations and challenges
David Kinloch, Regional Manager UK for CDE said. “The Little Paxton quarry presented different environmental and technical challenges that CDE’s design and technical engineers, in collaboration with Aggregates Industries, tackled systematically and successfully to co-create a tailor-made solution that would deal with the clay contamination in the raw sand and gravel feed whilst addressing
requirements for a specific layout to match the site’s footprint as well as height, colour and noise restrictions.
“After the raw feed was analysed in its laboratory, CDE was able to determine how its solutions could match Aggregates Industries’ requirements such as specific products, tonnages, product blends, and stockpiling capacities.”
With a 180 tonne-per-hour feed rate, Aggregate Industries wanted to produce a mixture of aggregates and sands for the construction industry, with the option to blend 20mm, 10mm and 6mm products into a 20-5mm product. CDE designed a bespoke modular solution to reach this objective with the option to be further developed at a later stage. Matthew Sharpe, Quarry Operations Manager at Aggregate Industries said: "Whilst making a decision on the plant for Little Paxton APS and CDE were able to offer a solution to some of our specific requirements we had for the site. This included product blending and stocking capacity, as well solutions to make the operation and maintenance of the plant easier in the long term.
“The ability of CDE to meet these requirements and offer practical solutions is a major contributing factor to Aggregate Industries ultimately purchasing the plant"
The CDE solution
To tackle the clay contamination in the raw feed, Aggregate Industries opted for a complete CDE solution comprising an AggMax 252SR logwasher performing at optimal efficiency thanks to the inclusion of a Prograde twin deck washing screen, a transfer conveyor and an EvoWash triple cyclone sand washing unit. These are completed by six stockpilers, a
ProGrade rinsing deck, sizing screens and a Trackstack stockpiling unit. A tracked radial conveyor supplied by
APS was added to the installation to allow more flexibility on site.
Little Paxton Quarry
| p36 | July 2018 - Issue 51

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