The reliability of large diameter, high horsepower ball mill is paramount when large production and minimum downtime is required. The 17 ft. x 56 ft. double compartment ball mill at St. Lawrence Cement Company has the first gearless drive built in North America and has the world's largest hydrodynamic bearings currently built and running...Authors: T. Orser (Newmont Mining Corporation), V. Svalbonas ( Corporation) and M. Van de Vijfeijken (ABB) - SAG Conference 2011 - 2010 Newmont made the decision to purchase a 42 foot (ft) Semi-Autogenous Grinding (SAG) mill from and a 28 Mega-Watt (MW) Gearless Mill Drive (GMD) from ABB for the Conga Project in Peru.

Download scientific diagram | Gearless motor drive scheme. from publication: Technical Evaluation and Practical Experience of High-Power Grinding Mill Drives in Mining Applications | Grinding mill ...Looking at SAG mills for instance there are huge differences in CAPEX regarding their different drive systems. Especially in the the multi-MW class gearless drive systems seem to be a thing because of their advantages such as variable speed …

When mill power is between 18 and 20 MW, which is the current manufacturing limit of ring geared mills [2], either a gearless mill drive (GMD) or a ring geared mill with dual pinion motors can be chosen. Selecting between gearless or ring geared design is mostly dependent on size of the mill and power and speed requirements [3]...Examplesare rock crushers, sugar cane pulping mills and paper mills. If these drives were operated in the opposite sense, as isrequired by renewable power plant, which starts with a low-speed, irregular input and drives an electrical generator,they would provide a gearless solution for the wind turbine industry.The traditional ruggedness and ...

Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. 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 ...A single 7.9m dia x 11.7m long 17.5 MW gearless drive secondary mill with a capacity of 900tph, producing a final grind of 80% -75µm. Four 35m dia thickeners for intermediate float, two 35m diameter units for concentrates and four 12 diameter units for ultra-high rate final tails. The concentrate handling facility itself features 144m2 filters.

CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector. Our largest mills has been delivered to SINO Site to date are Ø12.2m x 11m 28MW Gearless Drive AG Mills and Ø7.9m x 13.6m 2x8 MW Twin Pinion Drive Ball …...Grinding Mills. CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector. Our largest mills has been delivered to SINO Site to date are Ø12.2m x 11m 28MW Gearless Drive AG Mills and Ø7.9m x 13.6m 2x8 MW Twin Pinion Drive Ball Mills. These mills are scheduled of start up on 2012. Read more

The CCV – ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill...3. Gearless / direct-drive wind turbines The Enercon Company of Germany and ScanWind of Norway have served as the pioneers of the Gearless, or Direct-Drive, wind turbine generator. By increasing the number of magnetic pole pairs in a generator from the 4 or 6 of conventional generators to 100 or more, the need for a gearbox may be eliminated.

4. Mill system dynamic analysis to ensure proper operation of geared and gearless driven mills. Modelling of ring motors or gears together with mill, foundations and subsurface soil - in a dynamic model that includes normal operation and accident conditions; 5. Consulting expert on ringmotor design to Siemens to prove the mechanical and structural...A cycloconverter-fed gearless mill drive is a drive system that has hardware and software protection functions to protect the equipment in case of abnormal operating conditions, malfunctions or ...

ble-speed drive (VSD) to produce a shaft rotational speed of typically 50 to 70 rpm. There are usually several drive modules in a drive station and there can be multiple drive stations on the conveyor. The power of existing GCDs goes from around 2.5 to 7 MW, with a total connected power in the range of 5 to 20 MW...The GMD system portion consists of a 12 MW GMD for a 36-ft SAG mill and two 8.9 MW GMDs for two 22-ft ball mills. Leaving the factory at the end of 2011, the two GMDs will be the first ones assembled at ABB's new GMD assembly factory in Basel, Switzerland. ... ABB gearless mill drive systems feature numerous benefits when compared with ...

The SAG mill was fitted with a gearless drive with a power rating of 24 MW and the ball mills were also fitted with gearless drive systems, each providing 16.4 MW. Also included in the scope of supply were transformers, E-houses, the drive control, the cooling system, protection equipment and operator control systems...Geared VsGearless DriveSolutions For GrindingMills China Ball Mill With Hydraulic Gearless Drive. Twiflex advanced braking technology for grindingmillsaltra guangzhouchinatoday 38 ftmillswith motor powers of more than 20 mw andball millswith diameters in excess of 24 ft ring motorgearless mill driveand it is due to this development that braking systems have been …

Cobre Panama is using six ABB Gearless Mill Drives (GMDs) at its recently commissioned copper concentrator in Panama. Two 28-megawatt (MW) GMDs are operating on the 40-ft SAG mills, and four 16.5-MW GMDs are employed on 26-ft ball mills along with the associated control systems...Chuquicamata copper mine in Chile. Commissioning of the world's most powerful gearless conveyor drive system. Our longstanding association with Swedish mining company Boliden is an example of how ABB's gearless drives …

• Hammer crushers (MAMMUT ® and TITAN®) • Impact crushers - Conveying and classifying equipment • Apron feeders, chain conveyors, reciprocating plate feeders, vibrating feeders, screens, roller screens, magnetic separators • Standard machines and -modules - Grinding and processing equipment • Hammer mills • SAG mills • Ball mills...Gearless mill drive system in iron ore ­processing. ABB was recently contracted to supply gearless mill drive (GMD) systems for two 38 foot semiautogenous grinding (SAG) mills at the Serra Azul iron ore mine in Brazil. …

Grinding Mills. CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector. Our largest mills has been delivered to SINO Site to date are Ø12.2m x 11m 28MW Gearless Drive AG Mills and Ø7.9m x 13.6m 2x8 MW Twin Pinion Drive Ball Mills. These mills are scheduled of start up on 2012. Our market share in China exceeds 80% with the ...• 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful mill drive system available,