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Minimizing recirculating loads is an imperative for producers such as the RiverStone Group, which operates 15 active quarries throughout Iowa and Illinois.
At its Colona, Illinois-based quarry, the company recently upgraded its plant with higher-capacity primary and secondary crushers. For optimum yield of finished product at its tertiary circuit, they installed a new P500HD Patriot Cone Crusher manufactured by Superior Industries.
Superintendent Scott Skerston recently calculated the circulating load ratios of the new cone. He reports that at a closed-side setting of 1-inch, the cone processes finished product at a 78% throughput; and at a ½-inch closed-side setting, the throughput percentage reaches 83%. "We're getting maximum efficiency, and very little recirculating load, while averaging 80% of our crushed material going directly out to the finished, saleable product stockpile," says Skerston.
In part, he attributes this to the cone's spiral tooth bevel gearing system, "which engages more gradually, giving an efficient transfer of horsepower to the rock, rather than to the structure of the machine" he says. As a result, the cone is proven to perform at higher speeds with less noise and vibration.
Delivering a speedy return on investment, the site has nearly doubled its TPH output since the installation of the new crushers.
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