Abstract: Due to the huge volume of gearless ball mill direct drive permanent magnet synchronous machine (PMSM), an unwinding modular technology is convenient for its redundant power control, manufacture and maintenance. Several module units are wrapped around the ball mill roller for direct drive. The motor frame adopts a …
Conveyor systems are responsible for almost 80% of the energy consumption in mines. Gearboxes are maintenance-intensive and their lifetime is relatively short.
Ball Mills are the most effective laboratory mills for rapid batchwise comminution of medium-hard, soft, brittle, fibrous, temperature-sensitive and moist samples down to the finest particle size. The comminution of …
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 ...
"The trend to drives of more than 10,000 hp on large-capacity ball and autogenous mills for increased operating efficiency has been limited by factors in the conventional drive system. A solution to this problem, using modern developments in static converter technology, is the concept of driving the mill directly without gearing using a low-speed, low-frequency …
FL will deliver the three gearless SAG mills, three gearless ball mills and cyclones to the 150,000 Mtpd site by late-2023. FL was chosen to deliver the equipment due to the high reliability and efficient performance of our SAG and ball mill technologies. The Josemaria open-pit mine is a high-grade copper-gold porphyry project.
Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in …
April 1, 2012 - ABB will supply gearless mill drives (GMDs) for six ball mills and twin-drive systems for eight high pressure grinding rolls (HPGRs) at Cerro Verde copper mine in Peru. The two contracts were awarded in the first quarter of 2012. Deliveries are scheduled for Q4 2013 and Q1 2014.
Ball Mills are the most effective laboratory mills for rapid batchwise comminution of medium-hard, soft, brittle, fibrous, temperature-sensitive and moist samples down to the finest particle size. The comminution of the material to be ground takes place through impact and friction between the grinding balls and the inside wall of the grinding ...
next size Gearless Mill Drive, i.e. a 42ft mill. It is a dual design approach considering, on the one hand, the experi-ences Siemens made with Gearless Mill Drive (GMD) instal-lations over the past 40 years and, on the other hand, using computerized design tools calculating the system behavior where experience does not yet exist.
Whether you're talking about SAG or a ball mill, space is a delicate issue, especially in the concentrator. That's why we always design our Gearless mill drives drives to combine maximum performance with limited space requirements. Suitable foundation and adequate ground conditions Since our solutions have a low motor weight, this notice-
gearless ball mill malaysia; Parameters Of Grinding Mills. Ball mills with high efficiency separators have been used for cement grinding in cement plants all these years Ball mill is a cylinder rotating at about 70-80 of critical speed on two trunnions in white metal bearings or slide shoe bearings for large capacity mills . Effects of grinding ...
Twiflex modular brakes are providing up to 35 MNm of total braking torque on two 8 meter ball mills, which are part of South Africa's and probably the world's biggest platinum concentrator, at Anglo Platinum's Mogalakwena (previously PPRust) mine near Mokopane. The new concentrator expands milling capacity by 600,000 tons per month, producing …
gear transmission. The gearless ball mill has emerged. Because of its massive volume, the gearless ball mill is difficultto manufacture and maintain. Therefore, a novel module com-bined permanent magnet motor with wrapped type for mine ball mill (MBMWT‐MCPMM) is proposed, eliminating the gear and reduction box in the traditional …
Looking at economy of scale, new projects consider the use of big mill grinding circuits, where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied ...
Technologies for extraction and processing, including gearless mill drives (GMDs) and gearless conveyor drives (GCDs), help operators save energy and achieve greater throughput at large mills with higher grinding …
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.
the first GMD for a double-rotating ball mill in Carlin, Nevada, meeting a 160 °C heat challenge at the mill shell. GMDs have now been supplied for the world's ... The ABB gearless mill drive (GMD) is the most powerful mill drive system available, combining the highest levels of efficiency, reliability, flexibility and availability. ...
Our solution: SIMINE Gearless mill drives – outstanding reliability for your mine. The gearless concept. The gearless drive avoids any contact between the rotating mill and …
FL to supply ball mills, SAG mills and thickener solutions to Southeast Asian copper-gold mine April 05, 2022 02:30 ET | Source: FL A/S FL A/S
ABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills.
The gearless mill drive (GMD) has been continuously developed since its introduction in 1969. The structural design, the electrical parts and of course motor monitoring and …
CHH624 – Gearless Mill Drive Operation and Maintenance Course goal The goal of this course is to provide participants with the required practical knowledge and in-formation 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
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
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 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 …
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. ... A case study using an 18 MW Ball mill will be presented and the power system considerations including different harmonic filtering and ...
Over recent years, there has been a clear trend towards higher capacity cement production units. Five to ten years ago, 2500 tonnes per day was large. Nowadays in Asia, lines are built for 10000 tonnes per day. The development of ball mill grinding units has not shown the same trend, output and ratings have remained more or less constant …
The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive system. By mounting the rotor …
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-autogenous grinding (SAG) mills, or ball ...
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. Process developments in the mining and cement industries have increasingly tended toward the use of ever larger ball mills for grinding their products. As the horsepower drive …
Gearless mill drives: better by design . GMDs eliminate the need for a ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, which are used in a conventional mill drive system to transmit the torque from the motor to the mill. Instead, the torque is transmitted through the magnetic field in the air gap between the stator and rotor.
The measured stress ranges at the toes of the welds at the can-to-can flange in the Antamina ball mills were slightly higher than those obtained from the "standard" finite element analysis that was undertaken during the design of the mill. The difference between the measured stresses at Telfer and Antamina is that the liners in …
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 …
This paper introduces how PT Semen Bosowa/Indonesia considered the installation of a cement plant gearless mill drive, the criteria for the selection of the gearless mill drive versus traditional solutions, the technology developed for this particular application and the conclusion drawn from this experience.
Download Citation | Ball mill driven with gearless mill drive | This paper introduces how PT Semen Bosowa/Indonesia considered the installation of a cement plant gearless mill drive, the criteria ...
general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.
the days of the first gearless mills of the '80s, and thru the first 40 ft mills, extensive fabrication kick-off meetings were held, where all processes were discussed. Perhaps because this has become familiar, such is ... Ball Mill External Weld Design Cadia 6.7m 37.8 MPa 14 years Conga 7.26m 38 MPa * - Toromocho 7.82m 51.4 MPa * -
