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Sofol-ийн хийж байгаа зүйл бол хэрэглэгчдэд хэмнэлттэй, тохиромжтой үйлдвэрлэлийн шугамыг тохируулах, брэндийн үнэ цэнийг бий болгох явдал юм.
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 ...
The company selected ABB's 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 long-term service agreement (LTSA). This is expected …
The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft …
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 …
a "SAG Mill limiting" condition, i.e., harder ore, or a "Ball Mill limiting" condition, i.e., softer ore exists. For example, a ratio of 1:1.5 or up to 1:2 would indicate a trend away from processing harder ore types and an increasing bias toward processing softer ore types, whereas a ratio of 1:1 or higher would indicate a bias
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. Digitalization bringing visualisation and transparency. Advancements in big data, and digital technologies such as the industrial internet of things, the cloud ...
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 …
In June 1998, the world's largest grinding mill, the 40 ft (12.2 m) diameter 20 MW Cadia gearless SAG mill, was commissioned. This was a leap of over 40% above the largest operating SAG mill. A significant saving in capital cost gave the incentive necessary for a single mill line at Cadia, resulting in the selection of the 40 ft (12.2 m ...
Gearless mill drives (GMDs) constitute a compelling alternative to traditional ring-geared mill drives (RMDs) in such environments. Both drive types can be used to power large semi-autogenous (SAG), ball and autogenous mills, but GMDs are proven to offer superior availability, uptime and efficiency. When the first GMD was developed by …
of the inching reducer drive can be added to reflect efficiency losses. P inch = P inch ·(1 + (stage · 0.01)) where stage is the number of reductions between the inching drive motor and the main drive input shaft (or mill pinion if direct driven) Round up P inch to the next standard motor power. This standard motor power becomes the incher ...
Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new …
• 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 …
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 the mill, with …
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 ... Picture of a typical GMD system for a SAG mill …
Significant energy and cost economies can be achieved with a gearless mill drive working with a ball mill in these upper power ranges. This prospect should also be of interest to the cement industry.
The ABB gearless mill drive system will power the SAG mill with a variable speed drive that allows the mill to start smoothly with minimal mechanical stress and with automated 'dropped-charge' protection. ... unveiled the first gearless SAG mill, which has grown through stages of 38 ft (11.6m) and 40 ft (12.2m) until today's ...
Case studies: Aktogay and Bozshakol. ABB has partnered with Kaz Minerals to supply GMDs for the company's Aktogay and Bozshakol copper mines in Kazakhstan, both of which are expected to process 25 Mt/y of ore. ABB was awarded a multi-million contract to provide a 28 MW GMD for a 40 ft (12.2 m) SAG mill and two 22 MW drives for …
Get more done at a lower cost with higher throughput. Easily find the perfect fit from our wide range of sizes. Depend on years of proven reliability and productivity. Products. Maximise the productivity of your operation with durable high-efficiency Semi Autogenous Mill (SAG mill) and Autogenous Mill (AG Mill).
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- ...
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 …
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 ...
The test and study work showed that a single line 42 ft SAG mill circuit gave the most favorable project economics in comparison to an equivalently powered single line 40 ft SAG mill circuit. ... With this innovative concept the gearless mill drive eliminates all critical mechanical components inherent within a conventional mill drive system ...
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
Another solution is to use the so-called "gearless drive." A cyclo-converter reduces the power frequency and a synchronous motor is either wrapped around shell or mounted on a trunnion extension. This makes the mill essentially a part of a synchronous .motor rotor with the stator in its usual position around the rotor.
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 40-foot SAG mill has a power rating of 28 megawatts (MW), and the GMDs for the two 28-foot ball mills have a power rating of 22 MW. They are the largest diameter and most powerful SAG and ball …
During commissioning of the Cadia mills and shortly after, problems developed in the mill drives. The SAG mill gearless drive stator deflected excessively during inching and it "resonated" at normal operating speeds. Furthermore, the ball mill gears were severely scored after four months of operation. EAnD were commissioned by
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, …
Posted by Daniel Gleeson on 27th March 2012. Siemens has modernised a gearless grinding mill drive at Newcrest's Cadia Valley Operations, near Orange in New South Wales, Australia. This is the first time that a gearless grinding mill had been equipped with a Sinamics SL150 cycloconverter control. The modernisation concept …
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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