Page 6 - HUB-4 Magazine Issue 79
P. 6

 Washing Feature Story
 Sand recovery:
The Compact Sand Recovery Unit at Meriden is an all-electric plant and combines a Collection Tank, Centrifugal Slurry Pumps for both grades of sand, a Hydro-Cyclone for both the sharp and soft sand and a 3.7m x 1.5m Dewatering Screen on a single chassis.
It can recover 2 grades of sand from a wet feed and offers a maximum recovery of saleable material through the removal of silt, slimes and clays below 75μm (200 mesh).
Constructed in a robust easy to assemble steel construction, it features galvanized walkways and handrails to provide easy access. It provides low maintenance and simple operation with a self-regulating cyclone tank. Pumps and cyclones have replaceable rubber liners for extended wear life with a high frequency dewatering screen reduces residual water content in your final product to 10–12%.
This all-electric plant is driven from a dedicated control room through a PLC controlled panel to an NRS specification.
Ultra Fines recovery:
At the Meriden operation a sand recovery unit which supplies the ultra-fine sand is a crucial step in efficient management and recovery of ultra-fines sand from waste-water streams, produced from washing processes.
This Ultra-Fines Sand Recovery Unit can process up to 450m3/hour of slurry recovering material as low as 40μ, thus reducing the volume of solids reporting to storage ponds or water treatment plants.
Bringing together a Centrifugal Pump, a cluster of 4 Hydro- Cyclones and a high frequency 2.4 x 1.2m Dewatering Screen on one chassis. This unit also boasts a uniquely designed conical tank and anti-turbulence system, which is essential in the process of ultra-fines recovery.
Water Treatment Plant:
The fully integrated water treatment plant at Meriden, consists of a galvanised 16mØ Dynamic Thickener which stands at 3.5m high this provides a minimum of 500m3/hr flow rate and has a 700m3 volume capacity with a low flocculent consumption. The plant has the facility to dose, flocculants, coagulants and anti-foaming polymers, to facilitate the processing of more contaminated materials.
A 14m – 3m high Clarified Water Tank provides a 460m3 capacity with a technical room housing the Flocculant Dosing Unit and a Filter Press.
Rainwater is collected in a 1000m3 galvanised tank with high and low sensors and two pump points.
This process allows up to 95% of the water used in the washing process to be re-used. The dirty water is collected in a sump before being treated and allowed to settle in the Thickener. The thickened sludge is then sent to a 100mɜ buffer tank to control the density of the sludge prior to being compressed within the 2000mm x 2000mm x 165 plates filter Press enabling the last remaining water to be sent back into the system. NRS are then able to use the 30mm filter cakes that are expelled from the filter press.
The complete C&D processing solution:
Mark Ketcher – CEO of NRS Aggregates, “This is our sixth plant that has been delivered by PowerX Equipment and again they have delivered a processing plant that is exactly what we required. The new wash plant means there is virtually no waste in our C&D processing and the water treatment and filter press enable us to maintain low water usage and turn waste sludge into a usable product. The PowerX engineering teams are first class and their commitment to H&S is above and beyond industry standards.”
MD of PowerX - Luke Talbot, commented, “Our philosophy at PowerX Equipment is that we are committed to supporting NRS long after their plant installation. We understand that the key to their success is having reliable, fully operational equipment to keep productivity flowing and downtime to an absolute minimum. This is why we have invested in our Spares and Service Division to ensure we not only have a wide range of parts, but also an expert team of fully qualified and experienced engineers available to help our customers with advice, maintenance, and fitting in a timely manner.”
 | p6 | March/April - Issue 79

   4   5   6   7   8