Crushing

Modular sand plant passes test at live demonstration

The modular wash plant combines aggregate and sand washing on one modular chassis, producing three aggregates and two sands. The plant was officially unveiled at a TWS annual dealer forum in Ireland in September.
The main objective in developing the Aggresand plant was to meet its customers? needs for a modular system that can efficiently wash and produce multiple aggregates and sands within one machine. 
The Aggresand plant?s design achieves this by providing a throughput capacity of 250 tonnes per hour, as well as having quick set-up time; the plant can be erected in one day.
Thanks to TWS engineers, the plant is also designed for efficient transport by fitting into six shipping containers. During the packing process, the containers are loaded and arranged to help speed up installation time on-site. Quick set-up time is also achieved through essential ?plug and play? plumbing/pipework and electrical wiring, compared with traditional methods where this work is carried out on-site after installation.
{{image2-a:r-w:200}}The first Aggresand machine has been operating successfully in Dowling?s quarry at Abbeyleix in County Laois since late July and has been processing glacier sand and gravel formed during the Ice Age with ease.
?We are delighted to be the first quarry to install and operate the world?s first ever Aggresand. It is a superb washplant,? quarry owner Humphrey Dowling commented at the launch. 
?This plant replaced an older Terex washplant that was installed 13 years ago. So far I am very impressed with the functionality of the Aggresand. The plant arrived on site and was installed in 10 hours.
?I like the modular aspect, it can be moved to another site later. The throughput achieved on the plant is excellent and the quality of the aggregates and sands produced is impressive. The high performance, two-deck vibrating grid allows us to feed material directly from the quarry face.
?At 200mm, large material is scalped off while the minus 50mm material goes straight into the wash plant. This eliminates expensive pre-screening of the feed material.?
The Aggresand plant at Dowling?s quarry is fitted with a 12? (3m) double-deck vibrating grid with 100mm bofor bars and 50mm woven wire mesh. This particular plant separates 0-40mm to the wash plant, which gives three aggregate materials and two sand products. Reject material from the live head is stockpiled and later crushed when accumulated into stockpiles of 50,000 tonnes, then crushed into 6F2 material via a Terex crusher. 
On the bottom deck, the <50mm product is delivered by the feeder belt to a 1000mm wide electrically driven inclined feed belt. This wide conveyor is fitted with an integral wash box to pre-soak the material. It delivers the material to the full width of the screen, utilising the full screening area.
The 16? x 5? (4.9m x 1.5m) three-deck screen is electrically driven, producing an aggressive 6mm throw, and is fitted with eight individually controlled spray bars on each deck. The sized and rinsed aggregates produced by the screen are stockpiled on three 9m stockpilers.
The dual sand plant includes two rubber lined centrifugal pumps and two heavy duty rubber lined cyclones, which remove silt (<75 micron). The silt-free sand is delivered to a split 12? x 5? screen to produce two grades of dewatered (12 per cent moisture) silt-free sand. 
The sand stockpilers are radial powered through electrical wheel drives and have a stockpiling capacity of 350m3. The end products are used as follows: 6-14mm (503 drainage material), 14-22mm (503 concrete material) and 22-40mm (505 drainage material). 
The 0-3mm sand is for plastering and block making while the 0-5mm sand is used in the production of concrete. There is zero waste from the plant and minimum sand is lost to settling ponds.
In Australia, TWS products are distributed by Mineral Washing Systems (east coast) and OPS Screening & Crushing Equipment (west coast). ?
Source: Terex Washing Systems/Mineral Washing Systems


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