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STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR

STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR OPTIMIZING THE GRINDING PROCESS IN SAG AND BALL MILLS *I. Atutxa and I. Legarra . The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed. The feed in the mill contains fractions of ore that serves as the grinding media.

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Vibration Sag Mill Motor NDE Bearing AMP Maintenance Forums

Vibration Sag Mill Motor NDE Bearing Vibration Sag Mill Motor NDE Bearing. robbie60 Member. In the last month it has climbed to 4.5mm sec with the dominate frequency 1x RPM. The vibration at the drive end is normal around 2mm/sec in the horizontal and vertical direction and under 1mm/sec in

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SAG Mill Feed Particle Size Analyser

We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardwaresoftwares behaviour. Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.

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Mill (grinding) Wikipedia

SAG is an acronym for semiautogenous 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%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

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Characterization and Modeling of SemiAutogenous Mill

MODELING OF SAG PERFORMANCE UNDER OSD DISTURBANCES 4.1 Qualitative analysis The qualitative e ect of changes in ore size distribution (OSD) on the performance of the mill can be addressed using the grindcurves (Powell and Mainza, 2006) of the SAG mill under analysis. The operation of SAG mills is extremely sensitive to mill lling from a

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Noise monitoring for optimal mill operation bksv

Protecting and optimizing mills The main benefits of this type of reliable SAG mill monitoring are accurate and repeatable decibel signals at the various frequencies information that is used to protect the mills. The next phase of the project is to provide measurements that can help customers operate a SAG or AG mill optimally.

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Load Shedding, Load Restoration, and Generator Protection

the frequency to deteriorate further and the entire plant is soon in serious trouble. An additional major concern is the possible damage to the steam turbines due to prolonged operation at reduced frequency during this severe overload condition. To prevent the complete collapse of the island, under frequency relays are used to automatically

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(PDF) Acoustic emissions monitoring of SAG mill performance

Acoustic emissions monitoring of SAG mill performance. on frequencies equal to or lower than the mill rotation frequency. The process state of an AG/SAG mill can be inferred from surface

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Gearless Warp Around SAG Mill

An indifferent attitude of mill builders and electric motor manufacturers towards new drive technologies. Limited confidence in solidstate power supply systems,such as frequency converters of the required size. At this point, one should reflect on the reasons, why such large mills are considered to begin with.

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SAG Mill Grinding Circuit Design

Semi Autogenous Design FactorsLive Chat