Cement Americas

FALL 2017

Cement Americas provides comprehensive coverage of the North and South American cement markets from raw material extraction to delivery and tranportation to end user.

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22 CEMENT AMERICAS • Fall 2017 • www.cementamericas.com FEATURE S andwich belt high-angle conveyors are proven, ver- satile systems for elevating or lowering bulk materi- als continuously at steep angles up to 90 degrees. A wide range of industries have adopted the system, to handle coal, refuse, coarse copper ore, hot clinker, municipal sludge, wood chips, gypsum, slag, excavated earth, var- ious grains and more at throughput rates of 0.27 – 4,000 tph over elevating heights from 3.66 to 175 m. The suitability of the sandwich belt high-angle convey- or for continuously elevating raw feed to cement plants has been well established by many installations over the years, even replacing other methods of high-angle conveying. Installations at Cement Plants The first example of a sandwich belt high-angle convey- or delivering raw products for cement manufacture was in an underground gypsum mine. The vertical system continuously elevated gypsum rock. The underground crusher reduced the size of the material to a conveyable size (-6) and dropped it onto a reciprocating plate feeder to load the sandwich belt conveyor. At the surface, the conveyor discharged onto a plant conveyor that delivered the rock either to an outside storage pile or directly to the plant. This completely vertical system replaced a horizontal feed conveyor and bucket elevator, considerably simpli- fying material transport and eliminating a high mainte- nance transfer point. Closer to the cement-manufacturing process, the sand- wich belt high-angle conveyor supplied to Steel Cement Co. in Australia's Port of Melbourne, formed part of a complex, automated cement manufacturing plant. The raw products, steel mill slag and gypsum were brought in by ship and stored in an open stock piles. The slag, a by-product of the steel-making process was shipped in from Japan. As required, these were then delivered to separate hold- ing bins, from which the sandwich high-angle conveyor was fed at different load points. The critical blending process was achieved by metered feeding of the prod- ucts on to the sandwich conveyor's lower in-feed belt Making A Sandwich Cement Plants Fed by Sandwich Belt High-Angle Conveyors Can Save You Some Bread. By Mark S. Kuhar Sandwich belt high-angle conveyors are proven, versatile systems for elevating or lowering bulk materials continu- ously at steep angles up to 90 degrees.

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