sag and ball mill drive failures

sag and ball mill drive failures

Failure Modes Of Grinding Mills - akchojnicki

Drive standard of Kennicott SAG mill with double pinion and single ft SAG mill. Failure mode SAG mill and ball mill drive fault sag mill pinion failure. The

More

Cadia Girth Gear Failures - eand.au

2014-9-22  This is an update of work presented at the SAG 2001 conference on the Cadia gears. Both gears and pinions on twin ball mills failed almost simultaneously. Our 2001

More

Testing Failure Criteria for Grinding Mill Structures

2018-11-2  The continuation of this trend, in spite of occasional mill failures, in both the SAG and ball mill areas, requires a requestioning of some basic design

More

Literature Review: Gearless Motor Failures – A Mill ...

2014-9-10  The failure of the Collahuasi motor was catastrophic and it occurred within months of commissioning. The Collahuasi motor was for a 40 ft SAG mill. The Antamina 38

More

Mill drives: the desire for increased power and the ...

2021-8-19  The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios

More

Gearless Mill Drive Protection Improvements and Its ...

2021-2-15  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

More

Copper Mountain Overview on the Grinding Mills and

2015-7-29  The grinding circuit consists of a SAG mill and two ball mills, all dual pinion gear driven. Copper . 3 Mountain has selected the state-of-the-art dual pinion

More

TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

Errath, R., 2006, “The Gearless Mill Drive, the Work Horse for SAG and Ball Mills”, SME Conference, St. Louis. Protection and Supervision Systems for Gearless

More

SAG mills - Metso Outotec

Gearless mill drive (GMD) has further expanded the use of large SAG milling allowing Metso Outotec to produce the world's largest SAG mill of 42’

More

SAG MILL DISCHARGE SCREENS-TROMMEL vs.

2013-12-22  I’ve got to explain this a little bit. This flowsheet is typical of lines 1 and 3. The SAG mill has a trommel on the discharge end of it. Oversize is returned to the

More

Resonance effects, power quality and reliability issues of ...

2004-11-1  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 considered.. Due to the high mechanical torque involved ...

More

Improved Relationships for Discharge in SAG/AG Mills

2019-10-9  (SAG) mills. In order to optimize this section, the skills to accurately model and understand its underlying mechanisms are required. The literature exposed a clear lack of previous research on the influence and performance of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from

More

hydrostatic bearings in ball mills and sag mills

sag and ball mill drive failures universitycourses. sag and ball mill drive ge s support and failure analysis for hydrostatic. More Details. Sag And Ball Mill Drive ball mill bearings failure . Get Price; data of ball mill trunnion bearing. The first part of the mill that we will look at is the TRUNNION BEARING.

More

Mill drives: the desire for increased power and the ...

2021-8-19  The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 1:1.5 to 1:2.0, depending upon product sizing and pulp flow, i.e., the highest expected circulating loads (Morrell, 2001). The applied net power, calculated from testwork

More

An electrical impact study between variable speed dual ...

2015-10-22  Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed [1]. Recently, however, adjustability of Ball mill speed has been given more consideration. Also, to maximize throughput, the Ball mills are sized to be operated at ...

More

Literature Review: Gearless Motor Failures – A Mill ...

2014-9-10  This is at odds with the observation that the specific failures discussed in [1] have not been observed in small diameter machines such as those used to drive ball mills. Svalbonas’ paper paints the state-of-the-art in ring motor design as being in a parlous and undeveloped state in comparison with that of mills.

More

Ball mill/SAG mill drive lubrication system IEEE ...

2015-4-30  Ball mill/SAG mill drive lubrication system. Abstract: This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, functional description and a general overview of system layout as well as some of the important features and factors relevant to ...

More

Ø Effect of SAG Mill Feed Size Distribution and Ore ...

Ø SAG mill availability was lower than expected in the first year due to issues with the gearless drive and trommel panel failures. Figure 1 shows the ramp up of the Cadia Hill SAG mill by quarter.

More

Dry Grinding Ball Mill Drive Motor Failures

2021-4-24  The Department of Mechanical and Material Engineering at UWA had a batch ball mill which was available for the tests. This batch ball mill was adapted to suit the experimental equipment. The rig consisted of an electric motor a 201 gearbox drive shaft and a 0.3 m diameter by 0.3 m long drum.

More

Case Study - Grinding Mill Bearing Failure

2013-7-31  The drive spindle has three (3) bearings: two (2) cylindrical roller bearings and one (1) ball bearing. The mill is being belt driven by a 100 hp, two-pole motor. The mill normally operates at 3,150 rpm. 1.Outboard Motor Bearing Legend 2.Inboard Motor Bearing 3.Inboard Mill Bearing* 4.Outboard Mill

More

Resonance effects, power quality and reliability issues of ...

2004-11-1  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 considered.. Due to the high mechanical torque involved ...

More

II-100 II-101 INTRODUCTION

2021-3-8  operating speeds. Furthermore, the ball mill gears were severely scored after four months of operation. EAnD were commissioned by Cadia to determine the causes of the drive problems and to develop remedial measures [1,2]. The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive components.

More

Mill drives: the desire for increased power and the ...

2021-8-19  The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 1:1.5 to 1:2.0, depending upon product sizing and pulp flow, i.e., the highest expected circulating loads (Morrell, 2001). The applied net power, calculated from testwork

More

An electrical impact study between variable speed dual ...

2015-10-22  Conventional mining process circuits use both Semi-Autogenous Grinding (SAG) and Ball mills. It is very common that the SAG mills are operated with adjustable frequency drives (AFDs) and the Ball mills are operated at fixed speed [1]. Recently, however, adjustability of Ball mill speed has been given more consideration. Also, to maximize throughput, the Ball mills are sized to be operated at ...

More

Ball mill/SAG mill drive lubrication system IEEE ...

2015-4-30  Ball mill/SAG mill drive lubrication system. Abstract: This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives. Provided within this paper are hydraulic schematics, functional description and a general overview of system layout as well as some of the important features and factors relevant to ...

More

dry grinding ball mill drive motor failures

The centrifugal ball mill of type S 2 is suitable for ultrafine batch grinding (wet and dry) of medium hard, hard and brittle, hard and tough and fibrous ... Failure to comply will invalidate the CE declaration and guarantee. Drive. DC motor with spring pressure brake. Rated speed of motor 2500 mm-1.

More

(PDF) SAG mill circuit optimisation at Ernest Henry Mining

receives combined ball mill a nd sub – screen deck size SAG mill discharge material via a 20/18 Warman centrifugal pump running with a 1700 kW variable speed motor and gearbox.

More

sag mill dion pinion drive - thuishouden

SAG mills - Outotec. We are essentially providing up to twice the power transmission of a conventional dual pinion drive. Gearless mill drive (GMD) has further expanded the use of large SAG milling allowing Outotec to produce the world's largest SAG mill

More

Selecting Inching Drives for Mill and Kiln Applications

2016-5-21  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 ...

More

SAG MILL DISCHARGE SCREENS-TROMMEL vs.

2013-12-22  I’ve got to explain this a little bit. This flowsheet is typical of lines 1 and 3. The SAG mill has a trommel on the discharge end of it. Oversize is returned to the mill by a bucket wheel and water jet. Trommel undersize was pumped to a vibrating screen where the screen oversize was sent back to the mill and the undersize was pumped to the ...

More