Page 47 - Hub-4 Magazine Issue 74

Hillhead 2022
Preview
Wash Recycling – from Feeder to Filterpress
With hundreds of tonnes of Construction and Demolition (C&D) and excavation waste being stockpiled each year, a system that can recycle this waste into a saleable product has environmental as well as financial benefits to aggregates producers. This is exactly the solution SAPA, a Geneva based asphalt manufacturer, had been seeking when they began to investigate a way to recycle the waste they were sending to landfill.
Terex Washing Systems were tasked with finding a solution to this problem, which resulted in the design, manufacture and installation of a complete end to end construction and demolition wash recycling system. Everything from the feeder to the filterpress was included in this installation, which manages to achieve throughputs of 100 tonnes per hour.
C&D and Excavation Waste
The feed material is made up of excavation waste as well as construction and demolition waste. A H12 and H20 Feed Hopper receives loads from the shovel and removes oversized stones (larger than 100mm) from the material, thanks to the 100mm gaps in the feeder grid. These oversized stones are stockpiled for later use. Since occasional pieces of metal were present within the feed material, an over-band magnet has been installed after each of the feed hoppers.
The H12 Feed Hopper can be hydraulically tipped to prevent feed material from being lodged between the bars. This is controlled remotely from the cab of the shovel for safe operation.
Screening, Scrubbing and Classifying
After oversized stones and any metals are removed from the material, it makes its way up the main conveyor to be fed into a 12x5 2 Deck Rinser. This 12x5 Rinser gives the material an initial wash and classifies the material into two different sizes—with larger rocks and stones being fed towards a Terex MPS Impact Crusher and the rest making its way to an Aggrescrub 150 Log Washer. At this point, most of the sand is separated from the aggregates and is pumped towards the FM 120 C-2G Sand Plant.
The Aggrescrub 150 Log Washer uses two counter-rotating shafts fitted with a combination of AR500 blades and paddles to introduce energy into the feed material, causing the aggregates to rub and scrape together. This stone on stone attrition liberates conglomerates and breaks down the clay. The clean aggregates are then passed on to a 16x5 Horizontal 3 Deck post screen. >
Stand H6
www.hub-4.com May-June 22 - Issue 74
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