Engineering & Mining Journal

OCT 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 45 of 91

CONVEYOR ENGINEERING 44 E&MJ • OCTOBER 2018 Belt conveyor systems are one of the most cost-effective methods of transporting bulk materials. The limitations for these systems are the rise and the run. The length and the difference in elevation ei- ther add to the power requirements or the complexity of the braking system. Traditional belt conveyors are de- signed in flights, a set of shorter straight runs, with transfer points. Each flight requires belting, hardware and a drive, and each transfer needs chute work and the steel supports to redirect the flow. Erecting a conveyor in a straight line at a manageable grade usually meant considerable earthwork. Today's engi- neering firms are challenging those con- ventions and designing high-capacity systems that can navigate curves and undulations over long distances. Anyone who has spent time around conveyor systems knows they can be dangerous and dirty if not properly main- tained. Spillage is common during nor- mal operation and can be catastrophic if something goes wrong. Designers are considering more enclosed systems to prevent injury and fugitive emissions. Engineering Overland Conveyors When it comes to engineering overland conveyors, French-based RBL-REI is one of the leaders as far as design, manufac- ture and construction. Oftentimes, long, high-capacity overland conveyors have to overcome technical complexities such as curves and great vertical relief. RBL- REI has proven its skills and capabilities for challenging mining projects in Latin America. In addition to those projects, the company highlighted several current overland belt conveyors projects, which have been recently commissioned or are under construction. The Rogun Dam works in Tajikistan is being developed with the contribution of a 4-km-long overland belt conveyor with horizontal curves engineered and sup- plied by RBL-REI. The design has been challenging due to the combination of a high-capacity, 6,000 metric tons per hour (mt/h), with a narrow corridor demanding tight radius curves for such a system. The Italian-based EPC contractor Salini Impregilo has selected RBL-REI not only for its ability to deal with these difficult conditions, which includes a single flight with a 100-m-long span bridge, but also to complete the project and in the short- est delivery time ever for such a system. Belgium-based LHOIST also trust- ed RBL-REI to design and construct a 3.5-km overland belt conveyor, which will deliver lime to a processing plant in Tarnow, Poland. Due to the narrow corri- dor available between the quarry and the plant, RBL-REI had to engineer a system including a transfer point between the origin and the discharge point. The inno- vative solution developed by the French engineering company consisted of a belt twisting device on a single-flight sys- tem, meaning the same belt is working upstream and downstream with a 122° angle transfer point. The belt twisting system without motorization has been specially developed for this project to unify the two sections. This design achieved the following benefits: no chute New Twists for Traditional Conveyors In addition to high capacity, new conveyors are being engineered for safety and spillage By Steve Fiscor, Editor RBL-REI designed this 6,000 mt/h conveyor system with a 100-m span for the Rogun Dam works in Tajikistan.

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