Rock Products

JUN 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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www.rockproducts.com ROCK products • June 2018 • 23 for one of their experts to analyze our material and current production process so that they could offer an alternative and more efficient solution to our existing operations. "CDE quickly made contact and proceeded with a site audit, sand and equipment analyses, to then propose a tailor-made washing solution for our needs," he said. "To back up its pro- posal, CDE took us to a nearby site, where the equipment CDE was suggesting for us, an EvoWash dual-pass plant was running. "We were impressed by the quality and performance of the equipment we saw and requested a quote from CDE. Follow- ing this, we opted for a CDE solution and our new EvoWash replaced our sand screw in late 2017," he concluded. Dual Sand Pass A dual sand pass EvoWash 251 was offered as a solution with substantial benefits compared to the original sand screw system. A compact and user-friendly plant, the new system can efficiently process feed material to produce two prod- ucts simultaneously that are ready for market straight from the belts. After extensive testing by CDE to determine the proportion of silt material to be removed from the Burnet Quarry's raw feed, bespoke specification of the cyclone set up was calculated for unrivalled control over silt cut points. As an added revenue and environmentally friendly bonus, the retention of all quality fines available in the raw feed trans- lates into reduced maintenance costs and a longer lifetime for the settling ponds. With more than 95 percent separation efficiency achieved with CDE cyclone technology, Oldcastle Materials' Burnet Quarry now produces 200 tph of concrete sand and 40 tph of mason sand at the same time. CDE's unique design means that the operator can control the curve of the concrete sand by adding or removing more of the mason sand to reach the desirable grading of the main C-33 concrete sand. Moisture content of the washed sand products has also sig- nificantly decreased compared to the previous technology, meaning sand can be immediately loaded to trucks without the need to wait for it to further dry in the stockpile. Two High-Quality Products Brett Ballard, plant manager at Oldcastle Materials, added, "We can now fully exploit the available raw feed and pro- duce two high-quality products at the same time, which are dewatered to near-dry levels. Our new CDE EvoWash sand processing plant has resolved inefficiencies by capturing the waste slurry flow from our plant that contains fine sand; it Left photo: The new system can efficiently process feed material to produce two products simultaneously. Right photo: John Condon, CDE (on left) and Brett Ballard, Oldcastle, stand in front of the new all-in-one EvoWash dual-pass sand-processing plant.

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