Victoria-based civil contracting and concrete recycling company Waters Excavations has invested in an 80 tonnes-per-hour wash plant from CDE, in a bid to recover valuable waste.
Based in Mildura, a city in the northwest of Victoria, Waters Excavations has invested in a construction and demolition wash plant to recover valuable sand and aggregates from concrete waste.
As a family run business operating for over 55 years, Waters Excavations is an earth moving contractor to various feed streams including crushed concrete, scalpings and a fine sand deposit, working on a wide range of civil construction works from minor works to major government infrastructure projects.
Problem
Waters Excavations had set sights to reduce the amount of waste sent to landfill, not only to become more sustainable, but also to recover valuable material which they can resell to be repurposed in the local construction market.
In 2019, Waters Excavations first met wet processing experts CDE at global trade show bauma in Munich, Germany. The Australian CDE team worked with Waters Excavations to understand their needs and wants, to create a solution suited to them.
“We first met CDE a number of years ago and have since been building a relationship with the local Australian team,” said Michael Waters, the director of Waters Excavations. “We had heard great things about CDE’s technologies from another one of their Australian customers, which really firmed our decision to partner with them.”
Solution
CDE’s solution incorporates the EvoWash sand wash plant, the AggMax modular logwasher, a feed hopper and stockpile conveyor. Working together, these technologies enable Waters Excavations to produce five products for the local market.
CDE’s S20 hopper transfers feed to the plant. The feed conveyor includes an integrated magnet for steel recovery, ensuring that Waters Excavation can recover as much material as possible to divert more from landfill.
The high frequency Infinity D1-63 pre-screen removes sand prior to the attrition process, with high-frequency screening action ensuring maximum sand removal, and the incorporation of the Infinity D1-43 screen dewaters organic and lightweight wastes liberated from the attrition process, enabling the production of two sands.
CDE’s RotoMax logwasher can be used in the processing of a variety of materials such as sand and gravel, crushed rock, construction and demolition waste material as well as a range of mineral ores and efficiently scrubs material for maximum attrition.
The incorporation of the AggMax modular logwasher’s upward flow rejects organics and other lightweight contaminants which are dewatered on the integrated trash screen, while the Infinity H2-60 sizing screen efficiently separates the material into three washed aggregates and allows the removal of sand liberated by the RotoMax’s attrition process.
Fines are passed to the EvoWash, a high-frequency dewatering screen with hydro cyclone technology, which gives unparalleled control of silt cut points, allowing production of high value, in-spec product straight from the belt.
Result
CDE’s pioneering solution is allowing Waters Excavations to produce high quality sand products to meet local demand, whilst also diverting waste from landfill.
Waters Excavation is producing five products thanks to CDE’s state-of-the-art wash plant. Products include two grades of sands; 0-2mm and a 0-4mm sand, as well as three aggregates; 4-10mm, 10-16mm, and 16mm-oversize.
One of the plant’s main features, Michael Waters said, is the ability to scrub aggregates of clay and float off lightweight contaminants such as leaves, sticks and light plastics.
“It’s been a real success,” he said. “I’m blown away with the level of contaminants we were able to remove from the waste stream and how clean the end products were.”
It’s a solution that could be replicated throughout regional Australia, which would have huge environmental benefits
“We’re delighted to see this plant up and running for Waters Excavations. Both of us are passionate about sustainability and recovering as much was as we can to be repurposed in local markets, contributing to a circular economy,” Daniel Webber, CDE’s Regional Manager for Australasia said.
“Plants like this are the future of the industry in their ability to minimise waste and maximise value, and we’re proud to share our expertise to create a solution which recovers and reuses valuable resources.” •
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