The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. ... 2001. A mechatronic solution Design and experience with large gearless mill drives. In Proceedings of the SAG 2001 Conference, Vancouver, Canada. [7] Meimaris, C., Lai, W. K. K. L., Cox, L., 2001
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This paper presents the technical details of the world's first 42 foot diameter 28 MW gearless SAG mill, installed at the Conga coppergold project in Peru. It explains the challenges and solutions for designing and operating such a large mill, and how it delivers high efficiency and low maintenance costs.
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E Primary SAG, 34x1 6 Two variable speed ac motors coupled mill, 4 million 22,500 to a gear drive with air clutches. motor, million each 6000 Two secondary ac synchronized motor coupled to a gear mill, million ball mills, 18x27 drive with an air clutch. motor, 602,000 6050 F Ptimary SAG, 34x16 Ringmotor system. mill, million ...
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The MAX Drive powers vertical roller mills up to 15,000 kW with two spur gear drive units that mesh with the girth gear under the mill table. Backed by experience and knowhow While our modern manufacturing processes are impressive, it's really our highlyskilled engineers and operators who make our girth gears stellar.
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95% linear loads 30 % linear loads. 5% nonlinear loads 70 % nonlinear loads. f GMD with 20'000 kW driving a SAG mill. In today's grinding plants are installed 1 SAG mill and 2. to 3 ball mills with a total installed milling power of about. 60 MW. Total installed plant power is about 100 MW.
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As you can understand from high standard deviation, the difference is not consistent but in 93 % of operation times, drive number 2 draw more current in both forward and reverse rotation. Power draw is about 7300 (kW) (max of Power draw is 8200 kW). The voltage always is consistent and there is no significant process change during SAG mill ...
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The world's most powerful gearless mill drives The three gearless mill drive (GMD) systems are the ABB most powerful ever made. The GMD for the 40foot SAG mill has a power rating of 28 megawatts (MW), and the GMDs for the two 28foot ball mills have a power rating of 22 MW. They are the largest diameter and most powerful SAG and ball mills ...
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The Conga project is located approximately 560 miles (900 km) north of Lima, at an altitude of 13,400 ft (4,100 m) above sea level. It is situated near the Newmont Yanacocha gold mine, where installed what was then the world's largest singlestage SAG mill, a 32 x 32ft ( x ) EGL mill, driven by a ABB gearless motor ...
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Mount Milligan is a new copper and gold Pushing the boundaries project located some 1,000 km north of With a diameter of 40 ft, the SAG mill is one of Vancouver in central British Columbia, the largest in operation in the world. ABB states Canada.
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Mill in Brazil and Lumwana having a 38ft, 18 MW SAG and one 26ft, 16 MW Ball Mill in Zambia, all three mills put in operation in 2008, as well as Los Bronces, Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of MW commissioned in 2011. In the light of increasing interest in that technology various ...
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For this expansion project, Kinross selected ABB to provide a 26 MW gearless mill drive system (GMD) for the mine's 40 ft SAG mill, as well as other drives, electrical infrastructure equipment and a longterm service agreement (LTSA). Joel Desmeules, Construction Manager for the SAG mill, at Kinross. "We are pleased with the ABB team's ...
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Tozlu and Fresko (2015) estimated that the total installed motor capacity of AG/SAG mills in hard rock mining in 2015 was million kW (see Fig. 1).Given that mining industry activity has been relatively slow since then, additional sales of AG/SAG mill capacity from then until now (2021) would possibly be no more than million kW.
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Paper held at SAG Conference 2011 By S. Gaulocher (ABB), Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) mills and large ball mills.
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The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, P shell, and the efficiency losses for the drive's ...
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the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment ...
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SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (13563)] AG/SAG Mill. AG/SAG mills are normally used to grind runoffmine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
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In addition to that, the smaller particles (less than a millimetre) will easily pass through the SAG mill. Both these effects will help the SAG grinding circuit, but will put more pressure on the ball mill grinding circuit. Download : Download highres image (173KB) Download : Download fullsize image; Fig. 13. SAG Feed PSD of UCS 100 [MPa ...
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Remedial design of the worldÕs largest SAG mill gearless drive. In: International Conference on SAG grinding, SAG2001, Vancouver, Canada, 2001. New performance enhancements technologies for the ...
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ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant. eBook: Grinding transformation
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Strain gauges were attached to a ball mill which is approximately m in diameter and 11 m long flangetoflange at the locations shown in Fig. measurement locations at gauge sets (A, B) and (D, E) correspond to the recommended locations for derivation of the hotspot stresses in BS7608 (1993),, they are and away from the adjacent weld toe in the shell, where T is the ...
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