# mill shaft power of gmd sag mill

### Gearless mill drives - Grinding ABB

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, service-friendly and fit for purpose design to provide

Get PriceEmail contact### GMD system for Toromocho mine ABB

1 x 28 MW GMD to power the 40 ft SAG mill; 2 x 22 MW GMDs to power two 28 ft ball mills ; The site's altitude and high power system required ingenuity and flexibility when in came to engineering the three systems. Some of the changes compared to GMDs for lower altitudes were:

Get PriceEmail contact### ABB gearless mill drive system to power SAG mill

It is situated near the Newmont Yanacocha gold mine, where an ABB GMD has been operating successfully since early 2008.The contract includes the engineering for a 28 megawatt GMD system for a 42 feet SAG (semiautogenous) mill, the world s largest mill in diameter.

Get PriceEmail contact### Mill drives: the desire for increased power and the ...

SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

Get PriceEmail contact### typical load factor for sag mill motor

When mill diameter and mill power became again increased, only the gearless mill drive gmd could be envisaged to cover this requirement above mw the gmd is by its nature a variable speed drive system process operators, once having the facility of adjustable speed, could not live anymore without it for sag mills

Get PriceEmail contact### 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.

Get PriceEmail contact### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

Figure 1. Picture of a typical GMD system for a SAG mill - "TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS". Figure 1. Picture of a typical GMD system for a SAG mill - "TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS". Skip to search formSkip to main content>.

Get PriceEmail contact### The engineering and process effects of choosing a motor ...

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

Get PriceEmail contact### SAG Mill - Official Feed The Beast Wiki

Oct 19, 2020 The SAG Mill is a machine added by Ender IO.It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts.The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency (resulting in ...

Get PriceEmail contact### GMD system for Toromocho mine ABB

1 x 28 MW GMD to power the 40 ft SAG mill; 2 x 22 MW GMDs to power two 28 ft ball mills ; The site's altitude and high power system required ingenuity and flexibility when in came to engineering the three systems. Some of the changes compared to GMDs for lower altitudes were:

Get PriceEmail contact### THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING

Gearless Mill Drive (GMD) or a conventional gear drive. T = P × (2π × ω)−1 ( 1 ) where, T is motor output torque measured at the output shaft (pinion) or mill shell (GMD), Nm; P is motor output power measured at the output shaft (pinion) or mill shell (GMD), W; ω

Get PriceEmail contact### ABB gearless mill drive system to power SAG mill

It is situated near the Newmont Yanacocha gold mine, where an ABB GMD has been operating successfully since early 2008.The contract includes the engineering for a 28 megawatt GMD system for a 42 feet SAG (semiautogenous) mill, the world s largest mill in diameter.

Get PriceEmail contact### Mill drives: the desire for increased power and the ...

SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

Get PriceEmail contact### INNOVATION NEWS Mills and GMDs - ABB

GMD for the world’s first 42’ SAG mill for the Minas Conga oxide gold copper project in Peru. There are numerous GMD projects for 40’ SAG mills in the pipeline for the near future, as well as some other 42’ SAG mill projects. Furthermore, ABB has GMD designs ready for 44’ diameter SAG mills with a rated power of up to 35 MW.

Get PriceEmail contact### typical load factor for sag mill motor

When mill diameter and mill power became again increased, only the gearless mill drive gmd could be envisaged to cover this requirement above mw the gmd is by its nature a variable speed drive system process operators, once having the facility of adjustable speed, could not live anymore without it for sag mills

Get PriceEmail contact### ABB increasing milling power and availability with GMDs ...

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 a pair of 28 ft (8.5 m) ball mills at Aktogay, and three identical systems at Bozshakol.

Get PriceEmail contact### Mill power draw models - SAGMILLING.COM

Mill Power Draw Models. The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models.

Get PriceEmail contact### Mill (grinding) - Wikipedia

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. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their ...

Get PriceEmail contact### SAG Mill Grinding Circuit Design

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the

Get PriceEmail contact### Metso SAG mills - Metso Outotec

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso Outotec to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso Outotec is the world leading supplier of gearless SAG mills operating globally.

Get PriceEmail contact### Autogenous and Semi-Autogenous Mills - ScienceDirect

Jan 01, 2016 The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value. 9.6. Problems. 9.1. In an SAG mill the dimensions of the mill were 9.75 m × 3.5 m and the specific gravities of the mineral and

Get PriceEmail contact### The engineering and process effects of choosing a motor ...

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

Get PriceEmail contact### sag mill gmd how does it work - BINQ Mining

CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL. The test and study work showed that a single line 42 ft SAG mill circuit gave the most The 42 ft diameter Conga SAG mill GMD power density value of 0.67 is not an »More detailed

Get PriceEmail contact### THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING

Gearless Mill Drive (GMD) or a conventional gear drive. T = P × (2π × ω)−1 ( 1 ) where, T is motor output torque measured at the output shaft (pinion) or mill shell (GMD), Nm; P is motor output power measured at the output shaft (pinion) or mill shell (GMD), W; ω

Get PriceEmail contact### INNOVATION NEWS Mills and GMDs - ABB

GMD for the world’s first 42’ SAG mill for the Minas Conga oxide gold copper project in Peru. There are numerous GMD projects for 40’ SAG mills in the pipeline for the near future, as well as some other 42’ SAG mill projects. Furthermore, ABB has GMD designs ready for 44’ diameter SAG mills with a rated power of up to 35 MW.

Get PriceEmail contact### Metso SAG mills - Metso Outotec

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso Outotec to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso Outotec is the world leading supplier of gearless SAG mills operating globally.

Get PriceEmail contact### typical load factor for sag mill motor

When mill diameter and mill power became again increased, only the gearless mill drive gmd could be envisaged to cover this requirement above mw the gmd is by its nature a variable speed drive system process operators, once having the facility of adjustable speed, could not live anymore without it for sag mills

Get PriceEmail contact### ABB increasing milling power and availability with GMDs ...

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 a pair of 28 ft (8.5 m) ball mills at Aktogay, and three identical systems at Bozshakol.

Get PriceEmail contact### SAG Mill Grinding Circuit Design

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the

Get PriceEmail contact### Mill power draw models - SAGMILLING.COM

Mill Power Draw Models. The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models.

Get PriceEmail contact### ABB commissions first gearless mill drives project in ...

May 26, 2011 The GMD powers a 38′ (SAG) mill at the Canadian Malartic gold mine. Engineering, delivery and commissioning of the complete 19 MW GMD system are worth more than $20 million.

Get PriceEmail contact### Autogenous and Semi-Autogenous Mills - ScienceDirect

Jan 01, 2016 The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value. 9.6. Problems. 9.1. In an SAG mill the dimensions of the mill were 9.75 m × 3.5 m and the specific gravities of the mineral and

Get PriceEmail contact### What is the difference between a SAG mill and ball mill?

SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9] Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are ...

Get PriceEmail contact### sag mill gmd how does it work - BINQ Mining

CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL. The test and study work showed that a single line 42 ft SAG mill circuit gave the most The 42 ft diameter Conga SAG mill GMD power density value of 0.67 is not an »More detailed

Get PriceEmail contact### Paper # 25 - Copper Mountain Overview on the Grinding ...

The grinding circuit for the Copper Mountain project consists of one FLSmidth SAG mill and two FLSmidth ball mills. Figure 1 - Overview grinding circuit The Copper Mountain SAG mill is 10363 mm [34 feet] in diameter and 6096 mm [20 feet] long. It is a grate discharge mill with an inside diameter of 10363 mm [34 feet] and a grinding length of 5334

Get PriceEmail contact### Mill (grinding) - WikiMili, The Free Encyclopedia

A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9] Attrition between grinding balls and ore particles ...

Get PriceEmail contact### Gearless Mill Drives Beneficiation Siemens Global

Frozen charge detection and automatic loosening with gearless mill drives (SAG Conf. 2015) Mill drives: the desire for increased power and the associated limits and conditions (SAG Conf. 2015) The engineering and process effects of choosing a motor design speed (SAG Conf. 2015)

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