Rock Products

JUL 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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30 • ROCK products • July 2018 A n independent contract crushing company is using its new mobile jaw and cone crushers – flanking a new mobile screen – to boost aggregate processing productivity while saving money on fuel. "Our current business model is to do contract crushing," said Duff Boyd, president, Riverbend Construction Services, Jefferson City, Tenn. "We focus on mining of construction aggregates and material recycling." Riverbend operates in the southeastern United States in Tennessee, Georgia, Alabama and South Carolina. It has three portable crushing plants, and the Kleemann plant is the newest. Riverbend owns no quarries or gravel pits; instead it pro- vides services to the aggregates industry, such as overburden removal, drilling and blasting, site development, and in this case, contract crushing and screening. At an established quarry in South Carolina, Riverbend was taking granite production to a new level – supplementing demand for product – that was unattainable by the quarry owner working with its own forces and equipment. There, a new Mobicat MC 110 Zi EVO primary jaw crusher, a Mobiscreen MS 15 Z screen, and a Mobicone MCO 9i EVO secondary cone crusher – all from Kleemann and acquired in summer 2017 – were working together via Kleemann's Interlink technology to smooth production and lower costs. "Here we are making crusher-run granite road base and a No. 4 material, which is 2 in. by 1 1/2 in. with no fines," Boyd said. The crusher run size is 100 percent passing 1 1/2 in., all the way down to 200 mesh size. Riverbend does the drilling and blasting of the gray granite, and loads and hauls the raw stone to the processing site on the top of the pit. Prescreen Saves Fuel, Wear With the new interlinked equipment, Riverbend was aver- aging 305 to 335 tph, depending on the feed. "If the feed is a good, well-blasted material, with this closed-circuit arrange- ment I can easily put up to 340 tph through. By well-blasted I mean a rock that's not chunky, that's shot well throughout with some fines in it and a variety of sizes that go into the pri- mary. But as the rock gets coarser, productivity slows down." Instead of a grizzly, Boyd's new Mobicat primary jaw crusher utilizes an independent prescreen that speeds productivity. "The prescreener pulls all the fines out, and that's where the tons per hour really pick up," Boyd said. "But if its a coarse material, it all has to go through the jaw and my tons per hour will go down. The prescreen is the ticket. Currently we don't drop any fines through the prescreen that kick out the side; instead they drop right underneath and bypass the jaw, and we blend and mix them at the scalping screen. The Missing Link Interlinked Jaw and Cone, Screen Speed Production, Cut Costs for Riverbend Construction Services. By Tom Kuennen Backhoe feeds new Mobicat MC 110 Zi EVO primary jaw crusher. Jaw (right conveyor) and cone crusher (left) send aggregate to Kleemann Mobiscreen MS 15 Z for fur- ther classification. Riverbend

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