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SAG Mills and spares | Stalmetinvest

Pinions Geared Rings Ball Mills and spares SAG Mills and spares Crushers and spares Buckets and teeth Support Rollers Lower, Upper, Bottom shells Infocenter SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous …

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Slip Ring Motors - matrix-industries

The motor's slip rings & brush gears, critical components on any wound rotor machine are rated for continuous operation and are fitted with highly reliable brush - lifting & short-circuiting devices.The unit's high quality carbon brushes feature a large cross- sectional area to better conduct high currents safely during heavy peak load conditions.

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SAG Mill Grinding Circuit Design - 911metallurgist

Many large mills around the world (Esperanza with a 12.8 m mill. Cadia and Collahuasi with 12.2-m mills, and Antamina. ndida # IV. PT Freeport Indonesia, and others with 11.6-m mills) have installed SAG mills of 20 MW. Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having been designed.

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Sag Mill Synchronous Motors - caesarmachinery

Sag Mill Synchronous Motors. Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc. large synchronous motor. The poles of ... stage mill (no ball mill after the SAG mill) and has a diameter and ...

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Design and dynamic behavior of large Ring Motors for ...

Ring Motors vary the speed of the mill by changing the sta-tor frequency. A cycloconverter provides variable frequency for start, stop and speed variation during operation. Figure 1: Ring Motor of the 38' SAG-Mill of Rio Paracatú Mineraçao; Brazil 3 Design Verification To assure reliability of operation the mechanical design must be verified.

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Ring gear drives huge grinding mill | Machine Design

The motor can also be used to inch and spot the mill for maintenance. Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor-...

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Synchronous Motor for Sale, DC Motors, Electric Motors, AC ...

We offer the most reliable choice for all kinds of Electric Motors, Sychronous Motors, DC Motors, Used Motors, Ball Mills, Rod Mills, Pebble Mills, SAG Mills, Mine Hoists, Crushers, Flotation, Mixers, Pumps, Diesel Generators, Natural Gas Generators and all the Mining Equipment you require.

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What's the Difference Between SAG Mill and Ball Mill ...

SAG mills grinding media includes some large and hard rocks, filled rate of 9% – 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills.

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ABB Ring-Geared Mill Drives

for induction and synchronous motors in single- and dual-pinion configurations. These drives are well-suited for all type of mills and ball mill ap-plications, and are able to cover the power range up to the mechanical limit of the gearbox or the ring gear. The solution provides ad-justable speed for AG and SAG mills, or the opportu-

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Ok Tedi plans for long term with SAG mill upgrades by ...

For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.

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Variable Speed SAG Mill

The disadvantages are that the D.C. motor, tends to be inefficient, and also tends to have a poor lagging power factor. Capital cost of a variable speed motor is higher than a fixed speed motor, but the biggest disadvantage of utilizing a D.C. motor, as a general rule of. Variable Speed SAG Mills Motor Capability vs Mill Capability

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Industrial Solutions Autogenous,

with slide ring into a single housing. The three-stage gear unit with integral auxiliary drive is installed separately. l. to r. Principle of the direct drive. Tube mill with direct drive. SAG mill with COMBIFLEX® drive for gold ore grinding. Ball mill with ring …

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Gearless Mill Drives | Beneficiation | Siemens Global

The Siemens 42-ft Gearless Mill Drive, still an evolutionary design approach? (SAG Conf. 2015) Optimization of the drive system for a cyclone feed pump (SME 2015) Increasing availability through advanced Gearless Drive Technology (CMP 2014) Design and dynamic behavior of large ring motors for grinding mills (SMMH 2012)

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Lateral Drive Alignment Ball Mill | Crusher Mills, Cone ...

how to align ball mill pinion to drive motor-[crusher and mill] SAG mill pinion – gear alignment … LGD Lateral Gear Drive. drives the ball mill directly via the pinions of the two output shafts and reduces the speed of …

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Mill (grinding) - Wikipedia

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

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Making remote mines and low ore grades economical and ...

Both ring-geared mill drives and GMDs can be employed to drive autogenous, semi-autogenous (SAG) and/or ball mills. The applications may be the same, but the challenge now is to develop bigger drivetrains with the power to drive these larger grinding mills – and this is exactly where GMDs come into their own.

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Grinding Mill Foundations

Most of our work since 2000 has been in developing grinding mill foundations to avoid vibration and unacceptable deflections. On a recent project for a plant in Peru, the client was told by the mill vendor that there was no need to do a systems (dynamic) analysis on the mill foundations because the mills on that project were gear driven rather than being driven by …

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Starter of SAG Mills with rotor resistance

wound rotor motor is not the best option for SAG mills becuse the slip rings always are a problem even with liquid resistors.Best option is synchronuos motor in combination with variable frequency drive.However if you already have the wound rotor motor the ERS operation is simple.

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Henan Mining Machinery and Equipment Manufacturer - Ball ...

pinion drive for ball mills Ore Mining Plant Sale. how to align ball mill pinion to drive motor … the main fixed speed drives for SAG and ball mills are slip ring motors …

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Gearless mill drives

The poles of the gearless or synchronous motor (also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the mill. The gearless motor is fed by a cycloconverter which has a rated output frequency of around 5 Hz for the GMD drive.

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ABB Library - Gearless Mill Drives

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 semiautogenous (SAG) …

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SAG Mill | Autogenous and Semi-Autogenous Mills | FL

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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The Siemens 42ft gearless mill drive, still an ...

The ring motor is not self-supported and needs the mill to fix the rotor ... demand for grinding mills beyond today's standards of 40ft ... SAG-Mill GMD delivered by Siemens. The aim of the test program was to identify all real natural frequencies in a modal analysis.

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Brazil's WEG installs SAG and ball mill slip ring motors ...

The motors are being applied in pairs to SAG and ball mills that operate through dual pinion drives supplying power to each mill. Historically, WEG says the customer was facing problems for a number of different reasons such …

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Ball Mills Brochure - Corporation - PDF ...

Ball mills designed for long life and minimum maintenance overflow ball mill sizes range from 5 ft. x 8 ft. with 75 HP to 30' x 41' . and as much as 30,000 HP. Larger ball mills are available with dual pinion or ring motor drives. Our mills incorporate many of the qualities which have made the Marcy name famous since 1913.

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abb low speed drive solutions for ring geared mills

, AG ABB Protection and Connection ABB Motors Drives and Power, of rolling mills The low speed motors, Ring Motors are utilized for. More Info Sag Mill Synchronous Motors

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Ring gear drives huge grinding mill | Machine Design

Ring-motor drives were first used in cement industry mills and later in mining industry applications. The largest ringmotor- driven mill in the world is a …

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Grinding Mill Design & Ball Mill Manufacturer

K=ring gear and pinion drive. ... SAG Mill vs Ball Mill. Ball Motion inside a SAG Mill. ... We have has designed a series of single stage speed reducers, which makes it possible to drive the mills by motors with a synchronous speed of 750-1000 RPM.

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bull ring for reymond mill 5057

Mills and gmds maarten van de vijfeijken looks at large larger and the largest units in grinding ore t he gearless motor also called wrap around motor or ring motor is a very large synchronous motor.the poles of reliable drive system for sag mills.early sag mills had a diameter of about 32 later.get price sag milling in australia revised.

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Insurability of Large Gearless Mill Drives (GMDs)

Introduction. We have written on risk associated with large ring motors in gearless mill drives previously [1, 2, 3]. In [1], we observed that ABB and Polysius were far too confident in 2001 when they claimed that 42 and 44 ft diameter mills and ring motors posed only manageable risks and that a 44 ft mill and GMD design was ready and waiting for a purchaser …

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Ring-geared mill drives - Grinding | ABB

Ring-geared mills operated with frequency converter (much more than just variable speed) (English - pdf - Article) Use of the latest technology to overcome the demands of mill operation (English - pdf - Article) Ring-Geared Mill Drives - Flexible and smooth operation - Brochure (English - pdf - Brochure)

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Drive and Automatic Control Management

Electric Maintenance / Control and specialized technical Assistance SAG Mills Ring Motors. Aug-2004 - Active CUSTOMER TYPE OF SERVICE YEARS Codelco, División Norte - Concentrating Plant A2 Electric Maintenance / Control and specialized technical Assistance SAG Mills Ring Motors. Jan-2004 to Nov-2009.

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Our History as Comminution Consultants - DJB Consultants

1983: Conceptual study and pilot plant test work for the first 36 ft dia. SAG Mill with a GMD (Gearless mill drive, or ring motor) at 15,000 hp and commissioned in 1991. 1986: Development and successful implementation of a Bond Work Index-based methodology for estimating power requirements for SAG milling and secondary Ball milling.

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Siemens expands mining portfolio to include gearless drive ...

The principal component of the new drive system, which was designed and constructed within just two years, is a ring motor with a width of 25 meters and a height of 20 meters. 38-foot SAG mill with gearless drive system from Siemens.

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SAG Mill Success—Start with the Basics

SAG Mill Success—Start with the Basics. SAG mills are often flexible enough to accomplish the same size reduction provided. by two or three stages of crushing and screening, a rod mill, and some or all of the. work of a ball mill. With units available in ratings up to 35,000 hp, capable of supporting a grinding line that can output more than ...

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, Ring motor with 2 separated stator windings [22 ...

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.