# Mill Shaft Power Of Gmd Sag Mill

## 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 …

## 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:

## 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

## Modelling SAG milling power and specific energy ...

the mill power and the efﬁciency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power …

## 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

## CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW …

that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the project economics. After assessing the potential reliability difference between the 40 ft SAG mill and the equivalently powered 42 ft SAG mill, Newmont made the decision in 2010 to purchase a 42 ft SAG mill from Metso and a 28 MW GMD from ABB ...

## GROSS POWER CALCULATOR - SMC Testing

predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

## Grinding Mill Power - 911 Metallurgist

May 08, 2017· The power required to drive a tumbling mill is of interest both to the designer and to the mill operator: to the former as a basis of design for the determination of the necessary size of the elements of the machine; and to the latter because all other factors being equal, the most economical machine is that which demands a minimum power for driving.

## 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 …

## SAG Mill Process Control - Grinding & Classification ...

If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

## 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), N·m; P is motor output power measured at the output shaft (pinion) or mill shell (GMD), W; ω …

## CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW …

that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the project economics. After assessing the potential reliability difference between the 40 ft SAG mill and the equivalently powered 42 ft SAG mill, Newmont made the decision in 2010 to purchase a 42 ft SAG mill from Metso and a 28 MW GMD from ABB ...

## 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.

## ABB gearless mill drive system to power SAG mill

Sep 01, 2010· 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.

## Outotec presents the world’s largest SAG mill - Mineral ...

Jul 08, 2012· The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec’s proprietary grinding mill technology, developed over decades for maximum reliability and performance.

## GROSS POWER CALCULATOR - SMC Testing

predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

## 1 x FLS SAG Mill (excl. Motor/Drive)

1 x FLS SAG Mill (excl. Motor/Drive) For Sale/Re-Assignment Mill Details Type of Mill FLS SAG Mill Mill Dimensions 12,192 x 7,620 mm (40’x25’) (Diam x L) Default Mill Speed 9.31 RPM Mill Speed 7.35-9.90 RPM Liners Metal/Rubber – Excluded Mill Drive Motor Type Wrap Around GMD Mill Drive Motor Size 26,000 kW (34,866 hp)

## 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 ...

## Insurability of Large Gearless Mill Drives (GMDs)

Sep 28, 2014· 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 [4].

## Ball Mill Design/Power Calculation

Dec 12, 2016· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size …

## 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.

## A Mechatronic Solution Design and Experience with Large ...

tems for SAG-Mills has become more and more common in the recent years. Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimi-zation of the process. The design of such large mill drive systems requires modern simulation tools to verify the system be-havior.

## Morrell C-model - SAGMILLING.COM

Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the JK SimMet software for determining mill power draw.

## SAGMILLING.COM .:. Mill Critical Speed Determination

The mill critical speed will be calculated based on the diameter (above) less twice this shell liner width. Mill Actual RPM: Enter the measured mill rotation in revolutions per minute. Result #1: This mill would need to spin at RPM to be at 100% critical speed.

## 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), N·m; P is motor output power measured at the output shaft (pinion) or mill shell (GMD), W; ω …

## AG mills - Metso Outotec

Gearless mill drive (GMD) technology has further expanded the use of large AG 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 AG mills operating globally.

## Outotec presents the world’s largest SAG mill - Mineral ...

Jul 08, 2012· The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG mill design is based on Outotec’s proprietary grinding mill technology, developed over decades for maximum reliability and performance.

## Go gearless with ABB’s mill and conveyor drives for more ...

May 25, 2021· GMDs are the most powerful mill drive system on the market and are used to power semi-autogenous (SAG), ball and autogenous (AG) mills. These motor systems require no gearing or direct contact transmission.

## A Mechatronic Solution Design and Experience with Large ...

tems for SAG-Mills has become more and more common in the recent years. Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimi-zation of the process. The design of such large mill drive systems requires modern simulation tools to verify the system be-havior.

## Morrell C-model - SAGMILLING.COM

Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the JK SimMet software for determining mill power draw.

## Insurability of Large Gearless Mill Drives (GMDs)

Sep 28, 2014· 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 [4].

## ABB to supply gearless mill drive to mine in Chile

Feb 28, 2011· The GMD system portion consists of a 12 megawatt GMD for a 36-foot SAG mill and two 8.9 megawatt GMDs for two 22-foot ball mills. Leaving the factory at the end of 2011 those two GMDs will be the first ones assembled at ABB s new GMD assembly factory in Basel, Switzerland.

## SAGMILLING.COM .:. Mill Critical Speed Determination

The mill critical speed will be calculated based on the diameter (above) less twice this shell liner width. Mill Actual RPM: Enter the measured mill rotation in revolutions per minute. Result #1: This mill would need to spin at RPM to be at 100% critical speed.

## TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL …

Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions.

## Preprint 13-050

Some consultants have the view that the gear drive is limited in power. Mr Craig Denecki (Falk Milwaukee) in his paper, presented at the 1996 SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at Escondida 13.4MW, which began operation in 1995. The reason for not having larger gear drives

## HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

mill and typically the lowest discs have to be replaced a few times before the total set is changed. For a complete change, a spare shaft ready for installation is an option available. Wear components can be lined with polyurethane, metal hard facing or natural rubber depending on application. Installed Power (kW) Type 132 HIG 132 300 500 HIG ...

## gearless mill drives Archives - International Mining

The $1.2 billion expansion, which saw throughput rise from 60,000 t/d to 120,000 t/d, involved the addition of two new thyssenkrupp-made ball mills, with ABB providing the gearless mill drives (GMD) technology. This came on top of the 33 mills the miner already had up and running as part of the existing 60,000 t/d plant at the operation.

## Michael Salinas – Gearless Mill Drives electrical project ...

Toromocho Copper Mine (Morococha - Perú) - 1x28MW 40' SAG Mill + 2x22MW 28' Ball Mill GMDs, the highest power density and most powerful GMD systems ever installed worldwide at high altitude (4600msal). Complete electrical engineering design and testing for this project (cycloconverter, transformers, E-Houses)