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ball mill failure modes. ball mill failure modeskwiatkowski skory . Grinding Mill Failure Modes Ball Mill Sag Mill Pinion Failure Modes Hot grinding mills ball mill ball mills are used primary for single stage fine grinding several failure modes may be present and you need to identify which is the primary mode and which are secondary modes that may have contributed to failure table …
As mentioned the Sag Mill was run for 8 days at its limit 5,500kwto 5700 kw and this is the time the high vibration started, I still have the motor suspect but the gearing pinion and girth gear did not look too bad.
SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at ndida 13.4MW, which began operation in 1995. The reason for not having larger gear drives was due to the limitation of gear manufacturers not having access to larger single piece special alloy castings. To the benefit of
Batu Hijau Grinding Mill Ongoing site support and SAG mill equipment audits Regis Resources Limited Technical Support Support services for vent fan failure analysis, pinion shafts failure analysis, mill audits Rio Tinto Coal Australia Pty Ltd Engineering support Lifecycle Cost Modelling Tanami Gold NL Tanami Gold Coyote Project, WA Grinding ...
The gearless mill drive eliminates ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings, used within a conventional mill drive ... • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill ... possibility of the catastrophic inter-turn failure by default. They make it possible to have real motor
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Configured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need
The Quadrex Mill Drive was created in partnership with CMD and Ferry Capitain Engineering as a large mill drive solution for the mining industry. Internal torque splitting capability of the Quadrex Mill Drive transmits motor input power to the pinion shaft …
This white paper focuses on the work carried out by Alphatec Engineering in the rehabilitation of the mounting system (concrete foundation, anchoring, and grout) of a pinion-bearing pedestal of an 8,5 m ø x 3,8 m semi-autogenous grinding mill …
When SAG mill liner bolts loosen, break or stretch beyond limits, liner impairment and degraded performance are generally next on the agenda, followed by mill stoppage for repair or replacement. ... Finding and fixing issues early will avoid undesired wear, broken teeth or even complete failure of the gear and pinion.
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 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...
Online pinion temperature monitoring of the pinion with infrared temperature sensors is the most consistent and effective means of detecting misalignment of gear driven mill systems, allowing the user to quickly detect and correct any misalignment that may develop.. A common failure cause of gear driven mill systems is misalignment, which in its most severe form can cause …
The standard line of mills includes autogenous ( AG ) and semiautogenous ( SAG ) mills, beginning with a 6 ft x 2 ft ( 1.83 m x 0.61 m ) 25 hp ( 18.7 kW ) laboratory mill and is followed by 12 ft to 36 ft ( 3.7 m to 11 m ) diameter mills ranging in power from 150 to 20,000 hp ( 112 to 14,900 kW ).
SAG MILL BALL MILLS MILL DESIGN DATA. These projects involved SAG mills from 26 to 36 ft in diameter, with installed power in the range 9.7 to 16.8 MW using single, twin pinion, and gearless technology for drives over 16 MW. The ball mills used varied from 13.5 to 25 ft in diameter, with installed power in the range 1.85
measures, e.g. inspections of the SAG mill. This avoids fixed speed pinion drives have to be stopped with a prior grinding-out / drain-out process before interruption and the necessary time to restart. As a consequence, variable-speed capability helps the operator to reduce downtime.
drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Confi gured in a twin motor arrangement, the motors share load in the tandem mill. The Customer Need
SKF supplied locally manufactured mill pinion assemblies including in-house designed bearing housings as well as a Taconite sealing solution to a longstanding customer in the local grinding mill sector intended for a 22x14 ft. SAG mill at a gold project in Russia.
Tumbling Mill (Rod or Ball) Mill TYPE E Has quadruple flanged construction. This also furnishes mill heads in two sections flanged and bolted in the center. All flanges are double welded. This type also reduces difficult transportation problems. Ball Mill & Rod Mill Liners. The head and shell liners for Ball-Rod Mills can be furnished of: Decolloy,
By mill we refer to Ball Mills, Rod Mills and SAG Mills. Anything gear and pinion really. The discharge end of the mill; For the operator this only becomes a problem should the bolts that hold the liners in begin to leak water and ground rock. …
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
The Outotec slurry wheel upgrade is a retrofit sealing solution for the grinding mill feed end. The existing configuration is replaced with a new and improved slurry return system featuring a unique water-wheel design that significantly improves the material containment of the feed ends.
The graph of SAG pinion energy (to 1.7mm) Vs Bond BM Wi is given in Figure 3. Excluding the very soft and very hard projects, shows that the database in general does support a broad correlation between SAG and ball mill hardness but that the function is -defined to be useful in sizing a SAG too ill mill from a Bond BM Wi measurement.
We also provide an onsite failure analysis as per AGMA 1010-F14 of failure modes present, if any. ... Shell Mapping, ASTM E2905, Cleansolv, Pinion Alignment, Ball …
Ball mill： Ball mills are the most widely used one. Rod mill： The rod mill has the highest efficiency when the feed size is <30mm and the discharge size is about 3mm with uniform particle size and light overcrushing phenomenon. SAG mill: When the weight of the SAG mill is more than 75%, the output is high and the energy consumption is low ...
Firstly, there was a serious flaw in the power configuration of the SAG mill and ball mill (both rated at 6000 kW with a single pinion drive). The capacity of the SAG mill was not fully utilized, as the actual operating power draw was only 3358 kW. This meant it was only operating at 56% of its maximum power, providing large room for improvement.
- Improve SAG Mill liners design to increase the availability of the plant - Improve and modify design of equipment/parts. - Perform first Condition monitoring survey at concentrator plant during commissioning stage such as Thermography in piping & ball mills pinion, Oil Analysis, UT inspection Mills and Crusher liners and UT Thickness testing.
SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...
Re Pinion pitting. One of the main reasons for mill gear and pinion problems has been incorrect lubricant and/or incorrect application of lubricant. Misalignment of pinion with the gear can make the problem much worse. It is essential to get both lubrication and alignment right to avoid problems.
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%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP ...
Hi Observing high vibs on pressing and lifting pinion DE and NDE bearing on a ball mill. Motor and main GB drive are OK. Clear predominant gear mesh frequency is appearing in the spectrum along with harmonics and side bands. But 1st GMF is predominant. side bands with pinion speed is seen. no GG speed side band was observed Some of the vib data, spectrums and photos …