Rock Products

MAY 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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44 • ROCK products • May 2018 Capacity Upgrade C reagh Concrete, in Northern Ireland, added a CDE R2500 feeding and screening system and an additional AggMax log washer to their existing installation at Draperstown in order to tackle conglomerate even more efficiently and rapidly than before. The combination of the new plant arrangements means that the minimum amount of mobile equipment and manpower are required and that expensive double handling is eliminated. A percentage of Creagh's products are generated from a challenging raw feed made up of conglomerated aggregate, sand and silts in equal proportions. This conglomerate requires high tech equipment to recover good quality sand and aggregates. In 2013, Creagh decided to handle this body of difficult mate- rial, which underlies its main sand and gravel deposit. The difficulty of recovering this material, which contained in excess of 30 percent unusable material, was overcome with the installation of a CDE AggMax modular logwasher, which recovered approximately 70 percent of the material including top quality natural sand containing no crushed material. The Challenge After three years of successful production Creagh decided to take their capacity further by tackling additional issues. Willie Doherty, director responsible for Ireland for Creagh Concrete, explained: "While we were very happy with this outcome there remained some issues which we felt we wanted to address to further improve our production facility. Some extensive areas of the pit contained what is effectively a compacted conglomerate which actually has to be ripped with an excavator from the face. The original feed hopper was specifically designed by CDE to handle sticky material when wet. This was fed by a loading shovel from material that had been pre-screened and crushed in the pit. "It proved necessary to crush the conglomerate to reduce it to a size suitable for processing, therefore preventing large oversize from blocking the hopper," he said. "Originally this was done at the face but the process required the use of a mobile crusher followed by a mobile screener. We also Capacity Upgrade Creagh Concrete Installs New Feeding, Screening System to Pair With Jaw Crusher and Increase Production. By Mark S. Kuhar Existing AquaCycle and EvoWash + AggMax.

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