Rock Products

JUL 2015

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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16 • ROCK products • July 2015 www.rockproducts.com How to Beat Blinding M ichigan-based Great Lakes Aggregates Inc. produces approximately 1 million tpy of limestone at its Sylvania Minerals Quarry located in South Rockwood, Mich. As the quarry increased the number of saleable products that it pro- duced, it encountered screening challenges along the way such as limited open area, screen breakage and severe blinding. "With only nine months of production time each year it's important that we keep production on track," said Bill Begley, quarry manager at Sylvania Minerals Quarry. The quarry's goal was to increase its throughput on all three decks of the wash screens, while producing four dif- ferent product sizes from clean, high-quality minus 3/4-in. material. After several failed attempts with other products to achieve these results, Begley meet with Kevin Hinkley at Conveyall Industrial Supply Inc. and Brad Rice from Major Wire Industries who recommended they try Major Wire's Flex-Mat 3 screen media. Synthetic Media Hinders Production All three decks of both screen boxes were originally fitted with modular polyurethane panels. The top deck screen had a 1/2-in. opening, the middle deck had a 3/8-in. open- ing and the bottom deck screen had a .212-in. opening. This system worked fine as long as the load of base materials and washed products were split equally. However, as the quarry increased the amount of washed products, the results were poor quality and lower production rates. The screens needed more open area. How to Beat Blinding Great Lakes Aggregates Finds a Way to Keep its Screens Clean. By Mark S. Kuhar One of two of the screen decks at Great Lakes Aggregates screening limestone with Flex-Mat 3 screen media.

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