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Gearless mill drives, digitalization, AI and analytics are transforming grinding operations at mines worldwide. Mining: optimized. Grinding operations at mines around the world are …
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Comminution power – geared versus gearless. Posted by Paul Moore on 27th February 2023. It is well known in the mining industry that the biggest mining concentrators, with the highest throughputs and …
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Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical …
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demand for grinding mills beyond today's standards of 40ft is just part of the natural market development and will soon challenge the suppliers. Past experiences guided Siemens to establish a new culture in designing bigger and more powerful Gearless Mill Motors for the expected de-mand for 42ft and 44ft mills.
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Gearless mill drives (GMDs) are the grinding solution of choice in challenging environments. By eliminating bolt-on mechanical components such as ring-gears, pinions, couplings and gearboxes, GMDs offer ore …
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Keywords-cycloconverter; gearless mill drive; GMD; protection; minerals processing; grinding I. INTRODUCTION To process an average of 120.000 tons/day of mineral, the Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives
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Grinding mill drives play an important role in the mining industry. Almost 60% of the electrical energy consumed by modern concentrator plants goes to grinding mill drives. Different technologies ...
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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 copper-gold 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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SAG mill screen undersize will discharge by gravity into a primary cyclone feedbox where the variable-speed primary ball mill cyclone pump will feed the slurry to its associated hydrocyclone cluster. Each of the three grinding lines will have one 8.3 m diameter x 13.7 m EGL ball mill with a 19.5 MW (22 MW peak) gearless drive ring motor.
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The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability. The …
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Gearless Mill Drives to assure high productivity and operational reliability In conjunction with the mill-dedicated operation modes, the Siemens GMD provides a variety of …
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has over 100 years of experience in horizontal grinding mills and has always been an industry-leader in innovative technology. 's unmatched expertise ensures delivery of your Premier™ mill or Select™ mill based on your operational needs. When choosing your equipment we not only keep in mind mill performance, but also considering ...
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Your challenge: High availability, lower costs, better performance. Grinding is a crucial process step in ore processing – and for a mine's overall performance. That's why a …
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Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry.
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Conga: The world's first 42-foot diameter 28 MW gearless SAG mill (English - pdf - Technical publication) Copper Mountain: Overview on the grinding mills and their dual pinion mill drives (English - pdf - Technical publication) Insurability of large gearless mill drives (English - pdf - Technical publication)
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Grinding is a crucial process step in ore processing – and for a mine's overall performance. That's why a grinding mill's gearless drive is the crucial piece of equip-ment in the concentrator – and why it is subject to very rigorous demands. High availability and reliability throughout the entire lifecycle are a must, while unplanned
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Gearless drives and systems lik e ABB's ACS6000 all report mechanical output power. ... Many grinding mill owners choose a variable speed drive for their mill to cope with variations in ore ...
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Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), gearless mill drives (GMDs) are well positioned to contribute to the building of larger and ever more powerful mills. GMDs are the grinding solution …
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The availability and reliability of large grinding mills and their Gearless Mill Drives (GMDs) are of paramount importance for the grinding process. Although GMDs have been in service for decades, and are known for their operational efficiency (reliability and robustness with reduced operating cost per ton),
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Gearless Mill Drive, GMD, Frozen Charge, Backed Charge, Frozen Charge Protection, Frozen Charge Shaker, Grinding Mill Introduction A Frozen Charge – also referred to as locked, cemented or baked charge – describes the solidification of the mixture of ore, steel balls and water in a horizontal grinding mill.
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Gearless Motor Drives for Grinding Mills Fig. 1, General scheme of a Gearless Mill Motor drive [24]. of the airgap is in the range of 15-17 mm. A tolerance of
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Siemens has provided almost 100 SIMINE Gearless mill drives to the mining industry since 1980. In these thirty-plus years, SIMINE Gearless mill drives have accumulated a combined total of over 500 years in operation time – and this number is steadily growing even as you read this. This is a benchmark we are immensely proud of. Siemens ...
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Gearless mill drives As was mentioned above, a gearless mill drive constitutes both an important part, but also one of the most critical elements of a concentrator or a cement plant. Their purpose is to ensure the continuous rotation of specific types of tumbling mills, more specifically autogenous grinding (AG) mills, semi-
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While mill diameters have touched 42 feet, at the same time power required has gone upto 38 MW per system. Because of huge processing requirements, mills have migrated from geared to gearless and accordingly changes in mechanical systems, drive motors and power converter technologies have thrown a bigger challenge.
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Fig. 1 — Twin-pinion drive gear driven motor. Fig.2— Gearless mill with a ringmotor. of the grinding systems. NPCS were capital costs in Table 1 are based on variable speed ac drive complete determined on grinding systems that operations with three different produc- with ring and pinion gears; and
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With over a dozen systems now installed around the world the new floating disc brake caliper has proved that modular braking on gearless drives is worth consideration when commissioning new grinding mill equipment. The ease of maintenance and the simplicity of the system has shown that an operator experiences less downtime and therefore less cost.
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Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself …
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The current paper looks at evaluating the merits of large geared mills versus gearless driven mills by evaluating the following factors: The capability of currently available systems in terms of power and mill diameter; Efficiency in terms of overall electrical power consumed vs mechanical output power; Capital cost; Running costs
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That's why a grinding mill's gearless drive is the crucial piece of equip- • High productivity ment in the concentrator ... 4 Good reasons to choose SIMINE Gearless mill drives • O perational reliability • M inimized downtime through the less vulnerable gearless through dedicated maintenance modes concept and a vibration-free, ...
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the mill, the mill itself becomes the rotor of the gearless motor. Building a track record ABB's experience in optimizing gearless solutions for grinding applications extends over 50 years, making it the market leader with the largest number of installed units worldwide. In 1969, ABB commissioned the first GMD for a ball mill at Ciments Lambert ...
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