Rock Products

SEP 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 • September 2018 Return on Investment Texas-based Metroplex Sand & Gravel recently moved its sand-washing plant to a new site. The company's production objectives were achieved after 16 months at the original site. The plant – manufactured by CDE – was disassembled, con- tainerized, relocated and installed by Metroplex employees in just 11 working days. It was then re-commissioned by CDE at Metroplex's newly acquired sand deposit site at Resolve Aggregates in Ravenna, Texas, near the Red River. The Background Keith Newell, president of Metroplex Sand & Gravel, said: "We discovered the CDE technology at ConExpo-Con/Agg 2014 in Las Vegas. The company was launching its new M4500 wash plant, designed to meet the needs of the North American market with a capacity of 450 tph." The CDE team explained how combining feeding, screening, sand washing and stockpiling on a compact chassis allowed for the fast deployment of the M4500, which would allow Metroplex to set very competitive production schedules. Newell added, "Shortly thereafter, a member of the CDE team visited the GS Materials Plant in North Carolina, which fea- tured a CDE 300 tph turnkey wet-processing solution. We were immediately impressed by the plant's ability to manage gradation and silt cuts, with the option to produce golf course spec sand in a single pass. With conventional classifying equipment and sand screws, this is difficult to say the least!" Metroplex also had the opportunity to discuss and witness the effectiveness of the modular model and recognized the potential of this approach for the company. Owning vari- ous sites, the ability to move a plant to a different location when relevant was considered an asset in terms of return on investment. A more detailed consultation with CDE provided efficient solutions to answer the client's primary requirement to produce in-spec finished products in a single pass, with a reduction in both the environmental and the plant footprint, with a focus on decreasing the height of the installation. In 2015, following a process of co-creation with Metroplex to further meet its production requirements, CDE designed, manufactured and delivered a complete five-machine wet processing solution comprising the M4500 modular wash plant, the AggMax portable logwasher, the Counter Flow Clas- sification Unit (CFCU), an EvoWash fines recovery unit and an AquaCycle thickener. The Process The +3-in. material is delivered to an oversize stockpile from the top deck of the rinsing screen on the M4500 with the material between ¼-in. to 3-in. is transferred to the AggMax. Once the gravel has been scrubbed to remove clays, it is being stockpiled into three product grades: 3/8-in. minus, 3/8-in.– 1-in. and 1-in. to 2½-in. The 1-in. to 2½-in. is conveyed from the screen to a Cemco Model 80 vertical impact crusher where it is crushed to sand and smaller gravel particle sizes. The AggMax also includes a dewatering screen at the rear, which accepts the lightweight organics floated off from the gravel fraction and dewater these before stockpiling in a product bay underneath the machine. Modularity Matters Texas-Based Sand and Gravel Company Relocates Its CDE Wet Processing Plant to New Site to Optimize Return on Investment. By Mark S. Kuhar Plant overview from a distance.

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