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Ev sayfası >> Dişli Tahrik Sag Mill Vs Gearless Drive Sag Mill
Advantages of SER drives for SAG mills. Friday, December 19, 2014. For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cyclo-converter) is typically used because gearboxes and pinion gears reach their present limit …
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4 High ball charge SAG mill or ROM Ball mill (15 to 25% ball charge) Low competency ore Hidden Valley, Nzema, Sepon, UG2 ores (South Africa), Yanacocha 5 Low ball charge, high speed SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore …
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Laguna Seca concentrator uses a SAG mill and three ball mills, all driven by gearless mill drive (GMD) systems. Table 1 gives an overview of the basic technical data of the installed drives. TABLE I. MILLS AND THEIR DRIVES IN THE LAGUNA SECA PLANT Equipment Drive Comments SAG Mill (Semi-autogenous Grinding) Quantity : 1 unit
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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 …
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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 motor had to fit through a tunnel on the road to the site. This necessitated a change in the frame design from that used in older motors to allow clearance in the tunnel [8]. The next motor for ...
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GMDs: 22 MW GMD for 28' ball mill. 28 MW GMD for a 40' SAG mill. 28 MW GMD for 42' SAG mill. Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), …
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Siemens' gearless drive technology of 99.46 to 99.71% - 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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Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size is relatively larger.
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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remedial measures [1,2]. The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive components. During this work, the characteristics of the SAG mill system were measured. The resonant frequency of the foundation was determined using an amplitude decay technique. Vibrations in the SAG mill stator
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The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four 16.5 MW GMDS are employed in 26 football mills along with associated control systems.
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For economy of scale, new projects consider grinding circuits with SAG and ball mills with 36′ or larger mill diameters with cycloconverter-fed drives with powers in the range near 20. MW.. For the huge volume of slurry flows, big pumps with low-speed gearless drives fed by medium voltage converters in the range of 1–2 MW are being …
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ABB technology has helped Atalaya Mining to optimize SAG mill availability and performance at Project Riotinto, Andalucía; Digital solution ABB Ability™ Predictive Maintenance for grinding is part of the service for the ABB gearless mill drive (GMD) on site; ABB is following a long-term service agreement (LTSA) with Atalaya Mining, …
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2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the mine-to-mill (M2M) paradigm, a practice that has …
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(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).
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method of driving SAG mills, Ball mills and other rotating elements. Several thousand grinding mills have been manufactured and have been in operation for the last century. The gearless drive came into the minerals industry in 1980 and as per their reference lists, Siemens have approximately 60 installations and ABB have approximately 85.
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SAG mills can produce a lot of impact if operated with a high ball charge and low filling. Rod and AG mills can produce a lot of attrition and varying amounts of impact and abrasion. Arraying different mills can take advantage of the strengths of …
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• 28 MW GMD for a 40' SAG mill • 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 ...
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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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Some protection functions have tripped in the gearless mill drives operating at Minera Escondida and have been reviewed subsequently. This paper describes improvements …
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Fig. 1 depicts a gearless mil drive, where the mechanical power is transferred electromagnetically between the stator and poles of the rotor (Errath et al., 2003).Due to the mass flow, materials, and power involved in the process, SAG mills face the problem of high-energy impacts caused by steel balls cataracting against the shell of …
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Gearless drive for a SAG mill. Fig. 3 shows the comparison between a conventional pump drive and the gearless scheme using low-speed high-torque motor fed by a frequency converter. With a global efficiency of near 89% instead of 76%, the latter has an improvement in efficiency of about 13% because it has no gearbox losses.
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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 …
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The first Gearless Mill Drive (GMD) with a power of 6.5 MW was installed 1969 in a cement milling process in the cement plant Le ... numerous GMDs for ball mills and SAG mills have been installed in the minerals industry. The main advantages are that the GMD is adjustable in speed, and thus can fulfill the customer requirements with ...
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The optimum operation was found after 3000 hours running. The capacity was some 10% over the guaranteed capacity. This large mill 17′ x 56′ is not less efficient than a smaller mill 10′ x 28′ used in comparative tests. Maintenance of "Gearless Drive" Mill. The lubrication system. This depended on gravity feed of oil to the bearing pads.
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
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Semi-autogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational variables. …
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for a 20 MW SAG mill considering a power supply price of 11 US Cents per kWh. Erection and commissioning works on site are reduced ... The Gearless Mill Drive system consists of the ring motor with its feeding cycloconverter, pre-installed in an E-house. It also includes the excitation rectifier, the automation sys- ...
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The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive's mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical
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Now I finished the calculation of flowsheet with pre-crushing, SAG mill and Ball mills. The result is follows: 1. Pre-crushing- three crusher MP-2500() for crushing from 300mm to 50mm. Two working and once in reserve. 2. Primary grinding- once SAG mill with size 42ft x 24ft, power motor 28MW. F80-50mm, p80- 2mm. 3.
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Geared mills use Induction motors and Synchronous motors but there is a limitation on gears for power greater than 18 MW, moreover gears encounter maintenance problems. …
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Ringmotor of the Gearless Mill Drive (GMD) System. CYCLOCONVERTER Principle The Cycloconverter is a frequency changer which converts a poly-phase voltage with the frequency f1 into a single or poly-phase voltage with a different, lower frequency f2. On Gearless Mill Drives (GMD), the operational output frequency varies from 0.3 Hz up to …
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Gearless Mill Drive (GMD), accionamientos sin engranajes para molinos ABB. MAYO 2009 7 ... El sistema GMD Molino SAG (Semiautógeno) de 40 pies posee una potencia de 28 MW. Para alcanzar este requerimiento el SAG será equipado con el nuevo Cicloconvertidor ABB de 18 pulsos. ABB es una
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