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FD Birds, Catwick Quarry, England

Early boreholes for F.D. Birds’ sand and gravel project at Catwick Quarry in Beverley, near Hull, showed that lignite would be present in all extracted sand and gravel.

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Managing director John Bird entered discussions early with CDE to achieve a complete lignite-removal solution, ultimately resulting in the company’s 170 tonnes/h installation.

The dumptruck feed hopper (40-tonne capacity) is fed via an access ramp. Its heavy-duty design and 6in tipping grid accepts ‘as-dug’ material while removing excess oversize. Feed is then conveyed to a twin-deck R2M108 (20ft x 6ft) rinsing screen. This separates oversize, intermediate aggregate and sand.

The oversize is stockpiled while the –5mm slurry passes to a CDE MultiSands plant. The Multi-Sands plant comprises two CDE counter-flow classification units (CFCUs) fitted with sieve bends, and three hydrocyclones. The CFCUs separate sand at 250 microns, overflowing fine particles and lignite from the main sand fraction. PLC-controlled pneumatic pinch valves control the flow of sand from these units to two integrated C-Series quick-dry, high-frequency dewatering screens.

Finer cutpoints are achieved with the cyclones; these are specified according to the flow volumes at different stages in the system and have effective silt separation points from 75 mircons to 40 microns.

FD Birds Case Studies

FD Birds project images

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