The first large gearless ballmill in North America has been successfully installed at the Mississauga, Ontario, plant of the St. Lawrence Cement Company. The motor rating is 8750 hp (6500 kW) at r/min ( Hz). The electrical aspects considered of interest are discussed in the paper.
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With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system, such as ring gear, pinion, gearbox, coupling or air clutch, motor shaft and motor bearings. ... even for ball mills where these are not seen yet as a must. The initial capital costs are higher than ...
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Concepts of Gearless BallMill Drives Abstract: In the past the conventional method of driving large ball mills included some form of speed reducing gear between the higher speed driving motor and the lower speed ball mill.
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These are SAG mills with m diameter and 28 MW GMD drive and ball mills with m diameter and 22 MW GMD drives. The first production line is set to go into operation in 2022. ... Chile´s Minera Los Pelambres Ltda. is operating a new SAG mill and a new ball mill equipped with gearless drives systems by Siemens. The mills are intended to ...
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Gearless motor for a highpower mill. Fig. 8. Power circuit topology of a cycloconverterfed mill drive with two threephase windings. Fig. 7. Power circuit topology of a cycloconverterfed mill drive with one Fig. 9.
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The gearless drive avoids any contact between the rotating mill and the static parts of the motor. This allows for contin uous workflow without maintenance on the gears or the pinions. What used to be downtime is now productive time. Vibrationfree, lowweight, shortcircuit proof design with high stiffness
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The mill used for this comparison is a diameter by meter long ball mill with a 5000 HP drive motor. It is designed for approximately 90 per hour. This type twocompartment mill is a state oftheart shell supported cement finish mill. The torque and time requirements of the mill with the ball
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the world's most powerful gearless mill drive (GMD) systems ever made to Minera Chinalco's Toromocho mine in Peru. The GMD for the 40foot SAG mill has a power rating of 28 MW, and the GMDs for the two 28foot ball mills have a power rating of 22 MW. All of them are designed to operate at the extreme altitude of 4,600m above sea level.
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Each of the four lines will consist of a single 40 ft SAG mill with a 28 MW drive and two 28 ft ball mills, each with a 22 MW drive. ... All drives are Gearless Motor Drives from ABB. Each line will also include an FL cone crusher solution with state of the art digitalisation and control system. The first production line will be delivered ...
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Gearless Mill Drive Foundations: We have never encountered a foundation vibration problem with operating gearless driven mills, although there may be examples of this about. ... This means that SAG mill foundations behave very differently from ball mill foundations. 4 Mill Designer Stiffness Criteria ...
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Zurich, Switzerland, July 30, 2013 ABB, the leading power and automation technology group, announced today the acquisition of Alstom's ring motor business to enhance its gearless mill drive (GMD) system business. The parties agreed not to disclose financial details of the transaction. The business, based in Bilbao, Spain, has about 120 ...
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Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four MW GMDS are employed in 26 foot ball mills along with associated control systems. The six ABB Gearless Mill Drives have been installed since late last year and are all now in continuous operation; ABB team at Mina de Cobre in Panama
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For gearless drives, motor torque output at the maximum desired operating mill speed and ball charge volume has to be determined. Primary Mills: Torque Output (by Motor) vs Torque Demand (by Mill) For the purposes of this discussion, "drive speed" refers to the output speed of any mill drive system, whereas that of
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Combine ABB's variablespeed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ringgeared mill drives (RMD) or gearless mill drives (GMD). This solution was designed to control, stabilize and ...
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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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Siemens' gearless drive technology of to % as confirmed by real operational data from the Antapaccay mine in Peru. It was the first plant worldwide to use gearless drives for both applications. KEYWORDS Gearless Mill Drives, Gearless Conveyor Drives, Availability, SAG Mill, Ball Mill, Overland Conveyor, Antapaccay 15
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CHH624 Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and information on safe operation and maintenance of the gearless mill drive (GMD) system. This training will help to enhance the operation and the maintenance of the GMD in order to ensure
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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. ... The difference between the measured stresses at Telfer and Antamina is that the liners in the Telfer ball mill had been wedged by ball scats and ore as shown in Figure 4 and thus the liners supported ...
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With the largescale development of the ball mill, the directdrive gearless ball mill has emerged, eliminating the limitation of the transmission torque of large gear. However, it is difficult to process, transport, install and maintain the gearless ball mill because of its vast volume, and the coils cannot be decoupled freely.
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Antamina Compania Minera Antamina Peru Project: One SAG Mill and 3 Ball Mill Drive Systems Capacity: SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant: Bechtel, USA Mill Builder: FFE Minerals, USA Mill Size: SAG Mill 38 feet/11,58 m Ball Mills 24 feet/7,32 m Ore processed: Copper/Zinc Drive Rating: SAG Mill 20,1 MW, 9,23 rpm Ball Mills 11,2 MW, 11,38 rpm
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The first Gearless Mill Drive (GMD) with a power of MW was installed 1969 in a cement milling process in the cement plant Le ... The question what drive system is optimal for SAG and ball mills is project specific and depends on the plant layout and the design of the grinding circuit. When drives systems are compared the main
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At Los Bronces, part of the Anglo American Chile company, Siemens supplies a 22 MW gearless drive for a 40foot SAG mill and two MW gearless drives for two 26foot ball mills. Thanks to this development project, Los Bronces will be one of the biggest copper and molybdenum mines worldwide.
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Walks the walk, talks the torque. Designed to deliver exceptional levels of performance and value, David Brown Santasalo ball mill drives are optimised for primary and secondary grinding applications. Extensively field tested and proven in harsh cement applications, our mill drive gearboxes cover all grinding applications up to 10 MW per drive ...
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0:00 / 3:19 Introduction ABB gearless mill drives ABB in Mining subscribers Subscribe views 4 years ago https:///mining/grinding/g... | ABB ensures maximum throughput,...
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System Description. Figure 2: Sessego Mill Braking System. A typical braking system consists of one or more brake calipers, mounted onto two pedestals, one each side of the mill, symmetrical about the horizontal mill centerline. Brake operation is controlled by a hydraulic power pack designed to meet each individual application.
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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