Ball Mill Girth Gear and Pinion Alignment 2882011Link SAG Mill Girth Gear Failure Averted Best regards HeviiGuy Register to Reply TonyS Guru Join Date Aug 2010 Location Resting under the Major Oak Posts 4348 Good Answers 180 2 Re Ball Mill Girth Gear and Pinion Alignment Get price
Siemens the company that introduced Gearless Mill Drives GMD to mining industry started up its first GMD on a ball mill in Norway in 1980 The mill and its drive system are still in service Today GMDs are mainly used for SAG mills between 36 and 40 feet 107 to 122 m and ball
sag and ball mill drive failures zazvorucinkycz Cadia girth gear failuressep 22 2014 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 paper showed that the location of the failures is explained by the shape of the girth gear
The mill manufacturer specifies a load which is designed to be the optimum load applied to the bolts to hold the mill together for its entire life which can be in excess of 20 years some mill manufacturers specify an elongation unfortunately they usually specify a torque figure which should in a best case produce the correct elongation but
Ball Mill Problem The mine experienced repeated failures of pumps used on ball mills to circulate lubricating oil The unscheduled downtime accumulated quickly Resulting losses of productivity was averaging 12 hours per event six times a year Solution
Sep 10 2014 The Collahuasi motor was for a 40 ft SAG mill The Antamina 38 ft SAG mill was also driven by an ABB motor and the hanger plates had not failed on that machine after several years of operation Similarly the Sossego motor for the 38 ft SAG mill had not failed It too had an ABB motor and it had operated longer than the Collahuasi motor
Sag mill gear failure sag and ball mill drive failures sag mill drives girth gears at 18000 hp sag mill drives girth gears at 18000 hp operation and performance this paper was originally presented at the vancouver sag mill conference in 1996 Ball Mill Drives Mineral Processing amp Metallurgy
Sag And Ball Mill Drive Failures A single sag millball mill circuit based on the fdw mill sizing was change in ore hardness resulted in the significant shell liner failures
Nov 02 2018 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 philosophies up to now utilized for large mills The structural design criteria simply stated is based on two pieces of knowledge The stresses existing in any area of the mill
Developments in SAG Mill Design and Operation Over the last few years SAG mill manufacturing technology has advanced rapidly The bounds of mill size have been pushed from two directions Firstly the advent of ring motors has removed the constraint applied by the power that a
Nov 26 2019 The biggest characteristic of the sag mill is that the crushing ratio is large The particle size of the materials to be ground is 300 400mm sometimes even larger and the minimum particle size of the materials to be discharged can reach 01 mm The calculation shows that the crushing ratio can reach 3000 4000 while the ball mills
We have been fortunate to undertake detailed mechanical and structural design reviews and audits of all mill types from the five major mill vendors and of ringThe origins of the failure can be traced back to c 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill
Feb 24 2020 Due to the great technical knowledge and safety protocols of Metso Outotec in this type of work Codelco Andina invited the company to participate in the changeout of two of its 7500 and 8500 HP SAG grinding ball mill motors in the interior of its underground operation
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 12 The causes of both the SAG and ball mill drive faults were related to the stiffness of the drive components
Jun 03 2020 Note that ball mills are heavier than SAG mills therefore it may be misleading to think that large SAG mill designs lead the way Reference Autogenous and Semiautogenous Mills 2015 Update by F Tozlu M Fresko 2015 SAG Conference Vancouver British Columbia September 2015 and other OEM installation lists
abrasive and impact wear due to their large 75 100 mm dia meters Ball mill balls experience a greater number of impacts but at lower magnitude than SAG mill balls due t o the smaller
Cemtec and Siemens jointly developed a standardequipment economical solution to handle the power needed to drive a 104 x 61m 15MW SAG mill and an 82 x 14m 18MW ball mill at this Russian gold mill site Cemtec an Austrian company develops and executes projects for the mineral processing industry worldwide Service Online Cover headline
sag mill ring gear failure Grinding Mill China The failure mode mills can be driven via ring gear pinion More detailed ball mill pinion damage Gulin Solutions chinagrindingmillnet
The geometry of a mill with conical ends is shown in Figure 86 The total volume inside the mill is given by Vm 4 D2 mL 1 2Lc L L 1 DtDm 3 1 DtDm 816 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill
May 18 2021 Benefits of continuous data acquisition from critical large drive systems in a mine operation SME 2016 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
Grinding Mill Dimensions Mechanical Drive The ball mill motor power requirement calculated above as 1400 hp is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distributionthe following shows how the size or select the matching mill
failure analysis of the girth gear of an industrial ball mill KEYWORDS Failure Analysis Girth Gear Ball Mill Stress Analysis Fatigue Life Assessment Finite adjustments of the coefficients for the problem in hand We can supply pinions individually or engineer them as part of a fully optimised ball mill SAG or rotary kiln drive
Jul 31 2013 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 twopole motor The mill normally operates at 3150 rpm 1Outboard Motor Bearing Legend 2Inboard Motor Bearing 3Inboard Mill Bearing 4Outboard Mill Bearing Bearing that was failing
Dual pinion sag mill huisarts vansichemnl Ball Mill Failure Modes stundengebet SAG mill ball mill ring gear dual pinion drive systems variable Chat With Sal Chat With Sal ball mill failure modes OptonClinic Ball Mill Ball mills are used primary for single stage fine grinding regrinding and as the second stage in two stage grinding circuits According to the need of Chat
SAG mill ball mill ring gear dual pinion drive systems variable speed INTRODUCTION The project is located 15 km southwest of Princeton British Columbia BC an established mining town The initial exploration at Copper Mountain dates back to 1884 In 1923 Granby
Mar 01 2000 Following the SAG mill will be two 9000hp ball mills each one 20ft in diam and 3312ft long that do the finish grinding this mill uses a ringmotor drive Figure 5 The SAG mill is
SAG and ball mills with grate discharge are not prone to locked charge events because of the Pulverizing Ball Mill Failures Machinery Lubrication Pall Corporation areas where pulverizer drive train failures account for 53 of coal pulverizer designs are Vertical Roller
grinding mill regardless if it is a current or in a ball mill trunnion liner foundation head clutch reducer pinion bearing identifying the cause of failure then Get Price Custom Built SAG and Ball Mill Lubrication System Perrott
Jun 06 2016 By combining with SAG discharge and screening on the SAG discharge screens top size control to the ballmill circuit feed is maintained while still unloading the SAG circuit Mosher et al 2006 A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling while convenient this has the
The latter is the more common scenario and most failures of SAG or AG grinding circuits can Different styles of drives including wrap around motors are now used so the Dry Grinding Ball Mill Drive Motor Failures Fls Ball Mill Operation Get Price High pressure grinding rollsapplications for the platinum saimm benefits
absorption so a failure of mill bearings normally the weakest Output SEAP September 2012 2 CAUSES SAG and ball mills with grate discharge are not prone to locked charge events because of the high amount of rocks and balls compared to fine ore The pulp dischargers of a SAG mill continually pump the finer material out of the mill
of gratepulp lifter design in AGSAG mill discharge The current understanding from would also like to thank Dr Marko Hilden for providing his time and expertise for my research FIGURE 5 MILL OPERATING AS A PRIMARY ROM BALL MILL TOP AND AG MILL
Aluminium stair for support ball mill and sag mil EAnD Worlds Largest SAG Mill Gearless Drive and Failure Analysis of Ball Mill Gears Page 2 of 6 some of the largest in the world including the Collahuasi SAG and ball mills 40 ft and 26 ft respectively and the 40 ft AG mill at Cape Preston
VANCOUVER 2015 SOSSEGO SAG MILL 10 YEARS OF OPERATION AND OPTIMIZATIONS A M Mendon a1 D Luiz1 M Souza1 G Oliveira1 H Delboni J nior2 and M G Bergerman3 1 Vale SA Mina do Sossego SN Vila do Sossego Cana dos Caraj s Brazil 68537 00 2 HDA Servi os Ltda Professor University of S o Paulo Av Prof Mello Moraes 2373 S o Paulo Brazil 05508030 3
At 8 12 vv ball charge volume and 25 35 vv total charge volume the SAG mill typically draws 10 11 MW The operating work index for the mill is extremely ore depe ndent and can
Sep 01 1991 The standard line of mills includes autogenous AG and semiautogenous SAG mills beginning with a 6 ft x 2 ft 183 m x 061 m 25 hp 187 kW laboratory mill and is followed by 12 ft to 36 ft 37 m to 11 m diameter mills ranging in power from 150 to 20000 hp 112 to 14900 kW
sag mill dual pinion geared drive click here to get more infomation about ball mill failure modes sag mill ring gear failure Grinding Mill China Read more rod mill pinion gear failures beltconveyersnet African Copper Reports Failure of the Ball Mill Pinion on many ore crushing mills ball mills Failure modes that
Then with the development of variable speed ball and SAG mill drives the attention was centered in the evaluation of different converter options 3 and on the effect of different converter
SAG mill and how the vibration response and hence mill operating conditions vary as a function of time including during mill equipment failures such as a broken discharge grate Opportunities for improved mill control based on the data from the online monitor are also discussed as well as the implications in terms of mill processing and
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 FullerTraylor SAGAG Mills range in size from 43m through 122m in diameter with powers as high as 28000 kW
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