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(PDF) SAG mill monitoring using surface vibrations

surface of the mill. Vibrations are generated by collisions between grinding media, ore particles and the mill body. Changes to the vibration signal can indicate changes in charge characteristics...

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Sag Mill Syncronis Motor high axial vibration non drive ...

On site we have a Sag Mill Driven by a 5500KW Motor. We have a vibration issue right across the Mill. The highest vibration is 30mm/sec RMS axial on the motor non drive end bearing. (White metal Bearing) The gear mesh frequency is 4200 CPM. The dominant frequency is 2400 CPM.

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II-100 II-101 INTRODUCTION

hemisphere. It employs the world's largest SAG mill, 40 ft diameter and two 22 ft ball mills in the grinding circuit. In that project, the owners considered it necessary to assess the dynamic response of the foundations for the SAG and ball mills due to vibration problems experienced in other installations. Numerical models of the foundations

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sag mill condition monitoring

Thus, with condition monitoring of the SAG mill behaviors employing vibration, acoustic and thermal signals, the relevant parameter can be diagnosed and monitored. Accordingly, the mill may work on its optimum conditions without the concern of any imminent problem like mill congestions and unplanned stops.

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Benefits of continuous data acquisition from critical ...

Once the oil was changed, the vibration did not increase any further. The mill has been in operation one year since the lubrication problem was detected at an early stage Case 2) asset analytics system installed to overlook two (2) GMDs of 38 feet (~11.6 m) diameter SAG mill drives; in a remote location, recording simultaneously data of relevant

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On-line Vibration Monitoring System Improves Fault Detection

Online Vibration Monitoring System Improves Fault Detection in a SAG Mill. A copper mine site already had an extensive condition monitoring program in place. We went through their oil analysis reports regularly, sitting down with them and going through the possible faults. Every mine site has several critical machines.

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FRAGMENTATION Break it better - Blast Movement

able to adjust the SAG mill feed based on real-time data has allowed operators to optimise the size of material going into the SAG. This, in return, has increased the throughput at many operations worldwide, and has reduced liner wear significantly. Mark Wagner of WipWare notes that "when monitoring fragmentation at three crucial parts

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Company and Services

In later projects at Cadia, we strain gauged the 40 ft SAG mill to determine stress ranges and also the drives of the two ball mills to determine torsional vibration amplitudes as part of a long-term study of the mill drives. Cadia was undoubtedly the most significant project we …

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TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL …

SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

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AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

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Vibration Analysis - NECI

Vibration Analysis. A scientific approach to obtaining detailed information about the health of your rotating equipment. Equipment failure as a result of excessive vibration may not only leave you with expensive repairs but can also greatly increase the safety risks to personnel.

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SAG Milling in Australia -Revised Submission

The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia. Problems have been experienced with the twin pinion drive at Fimiston and with the ring motor at Cadia. At Cadia, excessive vibration and deflections in the drive stator were encountered during

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

The vibration issue was controlled by site maintenance and the vendor without any significant loss of availability until the strongback stiffener could be applied. The cracked rotor poles did not result in any damage to the windings again due to good maintenance.

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Vibration Sag Mill Motor NDE Bearing | AMP Maintenance Forums

Vibration Sag Mill Motor NDE Bearing. At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec. In the last month it has climbed to 4.5mm sec with the dominate frequency 1x RPM.

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Home | AMP Maintenance Forums

Vibration readings taken at mill HP pump running at various RPM, The vibration level was less and almost 8mm/sec to 9mm/sec when the pump was running at 900 rpm, so it is advisable to run the pump at 900 rpm to have minimum vibration in the SAG Mill. Conclusion:

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Investigation of the effect of filling level on the wear ...

The low frequency but high energy collision between the steel balls and the liners in the SAG mill is the dominated reason for the vibration of mill and the liner wear. From the perspective of collision energy, an apt filling level can be found in the operation of the SAG mill to achieve the balance between ore crushing, wear, vibration and the ...

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How To Reduce Chatter & Vibration In CNC Machining - SANS

Chatter is a problem that every CNC machine operator must deal with from time to time. Machining vibration is a common problem in CNC manufacturing. Milling, turning or drilling will all cause parts to suffer this torture. It affects the quality and efficiency of processing, will cause the finish of the parts to decrease, and will damage and significantly shorten the life …

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MillSlicer mill vibration analysis - Process IQ

MillSlicer has been developed for the mining industry, specifically for use on SAG/AG mills. The MillSlicer utilises vibration sensors and digital signal processing technology to provides information about the inlet and outlet conditions, and what …

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SAG Mill Grinding Circuit Design - 911metallurgist

As a result, under-sizing an SAG mill has disastrous results on throughput— across the industry, there are numerous examples of the SAG mill emerging as the circuit bottleneck. On the other hand, over-sizing an SAG circuit can be a poor utilization of capital (or an opportunity for future expansion!).

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Alphatec Egnineering SL - SAG mill complete foundation ...

In most cases, the main symptom of grout and foundation problems is high vibration levels of the machine itself, particularly when the trend is upward.

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Motion analysis of a tumbling ball mill based on non ...

Mill load has direct relationship with grinding production rate, product quality and energy consumption [2]. In order to quickly adjust current situation to optimized status, accurate detection of the mill load is one of the prime problems in the ball mill grinding process [3]. Communication mechanism of the ball mill is still far from ...

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The Role of Vibration Monitoring in Predictive …

vibration and plant operating data such as flow, temperature, or pressure. Continuous monitoring detects the onset of component problems in advance, which means that maintenance is performed only when needed. With this type of approach, unplanned downtime is reduced or eliminated and the risk of catastrophic failure is mitigated.

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Grinding Mill Control - Grinding & Classification Circuits ...

As I explained before, mill sound in a SAG mill may depend either on mill speed or mill filling. We did develop an instrument called "impact meter", which has been marketed by FL. The device is intended to recognize the specific sound pattern of balls hitting mill liners, in order to avoid such operating condition.

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Grinding Mill Foundations

Most of our work since 2000 has been in developing grinding mill foundations to avoid vibration and unacceptable deflections. On a recent project for a plant in Peru, the client was told by the mill vendor that there was no need to do a systems (dynamic) analysis on the mill foundations because the mills on that project were gear driven rather than being driven by …

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Process control challenges and opportunities in mineral ...

Grinding is often finished with a ball mill, which differs from a SAG mill, as it relies on the steel alone for grinding. A SAG mill may have 10% steel where a ball mill will typically have 30%. Classification is normally carried out in hydro cyclones with the product feeding either a flotation or leach circuit.

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Vibration Analysis - Laurentide

Periodic vibration routes for a large number of plants with practically no breakdowns, and therefore, no unforeseen losses. Minimum return on investment of 3 to 1 with the implementation of a vibration analysis program. Diagnoses of vibration problems on refiners, turbines, blowers, compressors, pumps, presses, etc.

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Noise Monitoring That Prevents Mill Damage | Brüel & Kjær

Noise Monitoring for Optimal Mill Operation. Mining companies around the world continue to face the challenge of increasing productivity and reducing downtime. As part of its SAG mill control system, Manta Controls developed the Manta Mic: a robust and reliable acoustic analyser that prevents mill damage.

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Improving Mining Critical Asset Performance

Beyond conveyors, continuous condition monitoring can improve performance for electric shovels, chute automation, SAG and ball mill automation, and mill circuit isolation. For electric shovels, Industrial Internet of Things (IIoT)-based wireless vibration sensors detect problems in transmission, motor unbalance, bearing failure and in propel ...