Quarrying
ABOVE: Quarry manager Jon Guglielmini (left) and Paul Campbell, owner of Powerscreen of California
3/4″ drain, which is clean—no dirt. We also make manufactured sand by using the jaw, cone and screen in closed circuit “We feed 3/4″ clean material directly into the cone from the
jaw. No other cone can handle a direct all-in-feed. And I have never before seen a cone that can handle fines going into it without plugging up. It’s actually hard to believe unless you see if for yourself.
“With the 1300 cone we can recycle in the morning and make sand in the afternoon with just a screen change, but no liner change,” Guglielmini exclaimed. “I simply don’t know of any other cone that can do that.
“When we first started investigating tracked equipment, Paul Campbell, owner of Powerscreen of California, the state-wide dealer for Powerscreen and Pegson, told us the Pegson 1300 cone could make sand from 3/4″ material. I was very, very skeptical. But I’ve dealt with Paul Campbell since 1995, and he’s always been straight up in everything he says. “So when Paul volunteered to bring in the jaw, cone and screen plants for a test in closed circuit, of course I agreed — and guess what — he was absolutely right. I was amazed. I’m still amazed. We put the whole system through every kind of gruelling test we could think of, and it came through with flying colours,” Guglielmini said, shaking his head. “We actually tried to prove the equipment couldn’t perform as claimed, but we couldn’t do it. The 1300 cone can actually make sand from 3/4″, 1/2″ and 3/8″ clean material.
“The new tracked system is also much more efficient. This is equipment that likes to be fed constantly. When we do, we can get production of up to 360 tonnes per hour in the quarry. Our daily goal is at least 3,000 tonnes, and we normally achieve 3,200 with the new system. With old system, we might have gotten 3,000 tonnes three times in 12 years.” Dutra had a lot of unplanned downtime for repairs with the old system. A major problem was with mesh and rebar clogging and tearing up the conveyors and chutes. And the old system had eight wear points, that is, where material drops from one piece of equipment to another. The new system has only four. The new system runs like a charm, according to Guglielmini. The manufacturer’s maintenance recommendations are followed, and the equipment is checked periodically for wear. This has resulted in very dependable service from all the new equipment. The old wheel-mounted system took three times as much maintenance time and work.
“I will go so far as to say that I believe tracked crushing and screening equipment, with its versatility and mobility, is the only way to go in California’s aggregates and recycling industry,”
www.solidsandbulk.co.uk
Guglielmini averred. “Nothing else makes as much sense to me. “But making the decision to purchase a tracked system was only the beginning. Purchasing six pieces of new equipment is expensive. We still had to convince our corporate management people that the payback would be well worth the cost, helping us to better compete in this tough business and still earn an acceptable profit. “To make that recommendation, we had to stick our neck out pretty far. But I was convinced that tracked equipment was the way to go. Before going to management, we considered a number of factors: purchase cost, equipment efficiency, fuel consumption, equipment durability, parts, anticipated maintenance downtime — it’s the unexpected downtime that can kill your profits. In other words, what is it going to cost to buy the equipment, the cost to operate and maintain it annually over a period of years, and what can you reasonably expect it to be worth in resale value down the road? Powerscreen of California was a big help to me in determining these things. “Lastly, I literally crawled under, over, around and through each piece of equipment to examine it for construction design and quality. Then we went to management with all our ducks in a row: facts, figures, features and benefits of all the tracked equipment. It was really a major change in philosophy for our company. But we decided to go ahead with the purchase, and it has been a very smart decision. Management is happy with the outcome. It’s all just one huge improvement.” For more information contact Powerscreen on tel: +44 28 87 718 500 or visit:
www.powerscreen.com
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March 2011 • Solids & Bulk Handling 35
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