Rock Products

FEB 2019

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42 • ROCK products • February 2019 Screening and Sizing All screens in the plant are supplied by Deister. "We generally dry-screen base stone products at the primary and sec- ondary crushers as well as a 3 x 5-ft. product," Griffin said. "At the wash plant, we wash and size on both three- and four-deck screens. The screen media is either Tema, Polydeck or Flex Mat. "We utilize both Schurco and GIW pumps to handle all the slurry pump- ing," Griffin added. "The MCC at the wash plant utilizes Square D and Toshiba components. Sandvik 660 crushers operate in the fully automated wash plant." Dry screening is accomplished on either two- and three-deck Deis- ter screens. The wet screening and washing is done on Deister three- and four-deck screens. Balcones Quarry makes upwards of 15 different products, both dry screened and washed. One of the highlights of the Balcones operation is its wash plant, which will be covered in detail in next month's issue of Rock Products. The new, fully-automated water recy- cling system uses and recycles 12,000 gal.-per-min. of water to separate aggregate sand fines, which are then reclaimed from the water stream as useable sand product. The water recy- cling system decreases the need for additional local water and adds effi- ciency to wash plant operations. "Our wash plant water at Balcones is supplied from our water recycling and sand plant," Griffin said. "The water recycling and sand plant utilizes Schurco Pumps, Abresist and Krebs Cys- lones, McLanahan twin 42-in. screws and both an Azfab thickener and McLa- nahan thickener. The recycling plant is fully automated and connected via fiber optic to the main Balcones plant auto- mation system." The plant automation system is expan- sive. A tower adjacent to the primary crusher is the center of control for the plant. Conveying and Material Handling The conveying and material handling aspect of the plant has evolved over many years. "Our stackers are Mesaba and Thor," Griffin said. "Other manufacturers have constructed conveyors in the past. RMS Engineering designed all the wash plant conveyors, and the wash plant utilizes Van der Graaf (VDG) motorized pulleys." The VDG motorized pulleys have helped the wash plant keep its electrical effi- ciency up, due to the lack of drive belts and transmission losses," Griffin said. "They've also made safety simpler because less guarding is needed." Stockpiling and Loadout Cemex materials are shipped by both truck and rail. "We ship a unit train to Haul trucks dump into the Hazemag primary crusher. Balcones

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