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MDA Technologies 5/2015

MDA Technologies 5/2015

01 02 01 Flender load

01 02 01 Flender load sharing girth gear unit from Siemens 02 Siemens delivered the drive technology equipment including an innovative gear unit for the two mills in a gold mine in Russia necessary for the single pinion conventional gear unit, are not required with the double pinion solution. Furthermore, the large dimension axial bearing is also removed from the assembly, further reducing the cost and complexities. The application of effective analytical methods like FEM, provided a further scope for Siemens to optimize the gear-assembly housing. This provides a lot of direct benefits, for example, replacing the bearings on the input shafts now becomes less tedious than before. Lubrication is another important area which affects the efficiency and the overall performance of the gear assembly. The flexible oil-tight bridge connecting the housing to the girth-gear, a system that ensures optimum lubrication in the pinion/ girth gear connection and the use of oil lubricant instead of the standard grease lubrication, offers improved lubricating characteristics, leading to higher efficiency and longer overall system service life. Photographs: Teaser Fotolia , Siemens, Cemtec www.siemens.com To Russia with love The 10.4 x 6.1 m SAG mill and the 8.2 x 14 m Ball mill developed by Cemtec were delivered to Polyus Gold International Limited, One of the top gold producers of Russia, for its new Natalka plant. Natalka gold mine is situated in the Magadan region of Far East Russia. Roughly 400 kms from the regional capital Magadan. The Natalka mine has 31.6 million ounces of proven gold deposits and possibly upto 59.7 million ounces of gold. Natalka is one of the world’s largest undeveloped gold mine. Cemtec provided not just the grinding mills but the complete plant equipment. The total cargo weighed 977 t, including 60 non-standard items and 9 oversized items of more than 9 m in diameters. The logistic operation of such a huge cargo was itself a very challenging task. After arriving at the port of Magadan, the 400 km journey required 18 main and 10 support transport vehicles, moving at a speed of 5-10 kms/hr and crossing 3 mountain passes at approximately 1 000 m above the sea level. Infact the caravan had to cross the overhead electrical cable and power lines 234 times. Due to the oversized cargo, at 40 cases the power lines had to be temporarily removed to en-sure the safe passage of the caravan. After approximately 10 days of transportation the equipment with capacities to grind 1.228 tsd. t of ore per hour was finally delivered at its destination. MDA Technologies 5/2015 51

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