INDA 2017

Best of Germany 2014 - Mining Equipment and Mining Technology

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VDMA 18 VDMA MINING SUPPLEMENT • 2017 operation since the fall of 2015. Each of the two overland con- veyors is approximately 2.5 km long with a lift of almost 300 m and transports ore from the mine to the processing plant. The belts are 1,830 mm wide, travel at 6.5 m per second, and are designed to transport approximately 9,400 mt/h. The stockpile at the end of the conveyor system is more than 50 m high and can supply the processing plant with up to three days' worth of copper ore for processing. The drive system for each of the two overland conveyors comprises two low-speed synchronous motors — each with a total power of 4,400 kW — and the associated Sinamics SL150 cycloconverters. The overland conveyors at Las Bambas were commissioned very quickly and the conveyor system is now in operation. "The project has been very successful and we are running the conveyors at nominal capacity with only a very few open issues. The gear- less drives are beneficial from a service point of view, given that there are no motor bearings or gearboxes, which simplifies ongoing maintenance requirements," said Timothy Mess, project director for thyssenkrupp. Peter Mizera, MMG's general manager for Las Bambas project delivery, shared a positive view of the project outcome. "Las Bam- bas has been a great success, and Siemens was a large contribu- tor to this outcome," Mizera said. "Siemens provided solid support during construction, precommissioning, and commissioning, and as a result, we were able to complete the overland conveyor com- missioning very quickly — in just under two months. This was a fantastic achievement." Following Las Bambas, Siemens recently supplied the world's highest-powered direct conveyor drive system to the Cuajone mine in Peru. The modernization project will entail the installation of a new gyratory crushing and conveyor system from thyssenkrupp by 2016 (See Material Handling, p. 25). Siemens proposed an Integrat- ed Drive System with direct conveyor drives to power this conveyor system, which has a total power output of 12,000 kW. The conveyor belt system comprises three individual sections that are equipped with a total of five Integrated Drive Systems. For the largest of the belt sections, Siemens is supplying two drive systems with an output of 6,000 kW each, comprising a low-speed synchronous motor and a Sinamics SL150 cycloconverter. The two smaller feed and discharge belts will be driven by two 500-kW low-voltage motors powered from Sinamics S150 converters with regenerative feedback capability and one 1,200-kW medium-volt- age motor. The converters and motors as well as the gearboxes and couplings for these drives are all supplied by Siemens. The automation components and the drive and power distribu- tion technology are provided in modular electrical rooms. Over the The 2.5-km overload conveyor system at the Las Bambas copper mine in Peru uses a drive system developed by Siemens that consists of two low-speed synchronous motors with a total power of 4,400 kW.

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