Dernaseer’s highly effective washing solution for Smith Construction
- 17 February 2017
- Company & Industry News
The HUB-4 crew took a trip to Newport Pagnell to look at a new Dernaseer wash plant installed at Smith’s Willen Road Quarry. The key considerations when purchasing the plant were value for money, cost per tonne of material produced, ease of operation and ease of access for service and maintenance. Dernaseer were chosen as the supplier after Smith’s looked at several different options across the industry.
We caught up with Ian Smith, Managing Director of Smith Construction “We’ve had this site now for 12mths and we have around 350,000 tonne total of mineral to process here, and to date we’ve processed 75,000 tonne. We wanted a wash plant that we could work on easily ourselves and have good access to everything. Dernaseer came up with a design that was practical, heavy duty and would ‘do exactly what it said on the tin’, giving us incredibly good access and control over everything. They installed high quality galvanised walkways around the whole wash plant so we can access the entire plant on foot.”
“The 120TPH plant was built on-time and on-budget by Dernaseer and has really impressed us. I’ve been extremely happy with the service and the whole experience from their family lead team has been great. Even when the plant arrived, the second truck was driven by Declan McKenna, Managing Director of Dernaseer, who then got totally hands-on with the installation process – what more can you ask for.”
The washing process contains a range of equipment from the Dernaseer product portfolio including a 20m3 belt feed hopper with remote control tipping and reject grid; DIS6162 washing screen, DLW502 log-washer, DSP120 cyclone sand plant, DIS5123 rinsing screen and 24m powered radial sand conveyor. The pit-dug sand and gravel material is fed into the belt feed hopper where the +100mm stones are rejected, while the 0-100mm material is fed up to the DIS6162 washing screen.
The DIWS6162 is fitted with a modular polyurethane screen system for increased wear and reduced noise. The -5mm material is washed through the bottom deck and transferred to the DSP120 sand plant where the -63um particles are separated and rejected, while the +63um-5mm concrete sand travels along the dewatering screen to remove excess water, and is stockpiled on the high capacity 24m powered radial stockpiling conveyor. The +60mm is rejected off the top-deck and is stockpiled for future crushing on-site.
The +5-60mm aggregates are fed into the DLW502 twin-shaft log-washer and are subject to a high level of aggressive attrition. This scrubbing further liberates more 0-5mm and in addition any lightweight contamination is floated off the rear of the log-washer. The contaminants are fed over a dewatering screen and discharged into a skip while the dirty water is fed into the DSP120 to maximise the recovery of saleable sand.
From the log-washer the scrubbed gravel is discharged onto the DIRS5122 rinsing screen which is also fitted with a modular polyurethane screen system. This gives the gravel a final rinse and separates them into the required sizes - concrete sand, 5-20mm, 20-40mm, and + 40mm which is stockpiled for crushing.