sag and ball mill drive failures
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- sag and ball mill drive failures
Control, Process Data & Preventive Maintenance. DCS or SCADA systems control many SAG, rod, and ball mills. These systems are diverse and individualized depending on the equipment and the scope of the system installed. Sometimes you'll see simple metrics, like run status, and other times you'll see more specific metrics like flowrate or RPMs.
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The twin 16 MW SAG mills and twin 16 MW ball mills with the installation of the pebble crusher deferred to Year 6 resulted in: • SAG mill throughputs maintained at 3170 t/h for the initial 6 years without pebble crushing • The ball mills were potentially slightly overloaded after Year 6 producing a P80 of between 120 and
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According to Figure 1, the dynamic model of the ball mill is where is the rotation resistance coefficient of the drive motor, is the friction torque, and the rotation direction of the ball mill is determined by the sign function sign().. When the rotational speeds of the clutch are synchronised, i.e., =, the clutch no longer slips. The dynamic model can be written as follows:
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The mill's SAG/ball/flotation circuit was initially designed for 35,000 mt/d. As mentioned earlier, a secondary crushing circuit had been installed to boost the mill tonnage rate to 40,000 mt/d. However, the increased circulating load led to overloading of the original 12 x 28-ft single-deck SAG mill discharge screen.
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ball mill pinion failure - pafoseuropedirect.eu. ball mill shaft failure analysis - maksinternational.in. ball mill shaft failure analysis. CR4 Thread Failure of ShaftIt is a gear box between Ball Mill of Pulveriser and Motor The shaft has broken at the FAILURE ANALYSIS OF SHEARED SHAFT OF A BRINE Failure of Shaft-ball mill shaft failure analysis-,reasons for …
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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
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After closed-circuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm. Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD). SAG discharge screen oversize ('pebbles' or 'scats') was recycled through an 185 kW pebble crusher.
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ball mill manual pdf. Ball Mill Maintenance Manual Pdf - two-do.nl. Ball Mill Maintenance Manual Pdf. Page 1 this f document is bookmarked operating instructions and parts manual variable speed turret mill model jtm-4vs shown with optional accessories x-axis table powerfeed and dro walter meier manufacturing inc27 new sanford road lavergne, tennessee 37086 part …
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Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Outotec is the world leading supplier of gearless SAG mills operating globally.
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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 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.
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Influence Of Feed Size On AG/SAG Mill Performance Mapping Orebody Hardness Variability For Ag-SAG Crushing And HPGR Circuits Modelling And Simulation Techniques Applied For Optimisation Of Mine To Mill Operations And Case Studies Modelling The Influence On Power Draw Of The Slurry Phase In Autogenous (AG), Semi-Autogenous (SAG) And Ball Mills ...
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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) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of …
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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:
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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.
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High temperature of the ball mill will affact the efficiency. 3 For every 1% increase in moisture, the output of the ball mill will be reduced by 8% -10%. 4 when the moisture is greater than 5%, the ball mill will be unable to perform the grinding operation. 5. The bearing of the ball mill is overheated and the motor is overloaded.
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The SMC Test®, developed by Dr Steve Morrell of SMC Testing, is a cost-effective means to predict comminution circuit throughput, rock mass characteristics and blasting properties. Energy requirements for crushing and HPGR options can now be determined in addition to AG/SAG mills, and with Mic, ball mills.
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Steel Grinding Balls Failures in Drop Ball Test (DBT)? ... If the balls' target environment is e.g SAG mill or large diameter balls mills, there are no two ways about it, you have to re-temper ...
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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 ...
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Specification Units SAG mill Ball mill Diameter m 10.97 7.32 Length m 5.00 11.58 Critical speed % 75 75 Power kW 12,000 12,000 Speed rpm 9.65 11.86 Torque kNm 11,881 9,667 Radius m 5.49 3.66 Tangential force kN 2,165 2,643
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Copper/Gold Mine SAG and Ball Mills ... direct-drive geared ball mills. The ... The VKSD-FL brakes on each mill provide 454 kNm on the high speed shaft. During a power failure, the mill's motors are disabled so the mill slows to a rocking mode due to the unbalanced charge. To prevent equipment damage, the brakes are used to provide a ...
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the primary crusher performance and proper control of the ratios for the SAG mill feeders drawing the ore from the stockpile. The ball mill grinding efficiency was poor and could be indicated by the fraction < 125 µm of only 5-9 % or x. P, 80: >400 µm in the mill discharge. This was deemed due
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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.
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Mill linings, Rubber Engineering, Salt Lake City, UT 84126, United States of America . ABSTRACT . Dramatic shortcomings of mill liner designs, especially of large SAG mills, - such as rapid failure and even mill shell damage arising from impacting of the charge directly on the liner, and unsuitable
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The two installed mills include a semi-autogenous (SAG) mill measuring 10.4 x 6.1 m with a drive output of 15 MW; and a ball mill rated at 18 MW. The SAG mill reduces ore fragments with a maximum size of 250 mm (P80 = 152 mm) down to 2 mm, and the ball mill reduces the SAG mill product to about 74 µm. Grinding is followed by flotation.
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Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of 16.4 MW commissioned in 2011. In the light of increasing interest in that technology various further Gearless Mill Drives with FCS are presently being erected or are in fabrication phase. Los Bronces suffered a Frozen Charge in their expansion plant Confluencia on 10th ...
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Ball mill with ring motor drive. Brake of a ring motor drive. 8 Flotation Wet grinding Grinding is one of the most energy-inten-sive production stages and therefore has ... SAG and ball mill for the wet grinding of gold ore in the Dominican Republic. 10 Flotation All around the world, mines are having to work ore ...
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The SAG mill has a mill diameter of 24 ft (7.3 m) and an effective grinding length of 18.5 ft and a structural charge mass of 315 t, Condor Gold said. The structural design ball charge is 11% with a structural design load volume of 35%. Specific gravity of the material is 2.55.
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Ball Mill Gear Failure Analysis Analysis of SAG mill motor drive failures Regrind Mill Refurbishment Project management, inspection and technical services for refurbishment of used ball mill Oceanagold (Philippines), Inc. Didipio Gold Copper Project Project Coordination Ok Tedi Mining Limited, PNG Feed & Discharge Trunnions on Ball Mill
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General Electric Grinding Mill Failure. News Introduction：reasons for electrical failure in ball mill grinder. general electric grinding mill failure.Reasons for electrical failure in ball mill grinder Mill (grinding)Wikipedia Ball mill A typical type of fine grinder is the ball mill A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or …
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Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) …
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Following the SAG mill will be two 9,000-hp ball mills, each one 20-ft in diam. and 331/2-ft long, that do the finish grinding. ... this mill uses a …
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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.
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The Material Transport Model also compensates for sensor failures. The Overload Prediction Model is a real-time AI model that predicts the probability of a mill overload taking place over the next 10-20 minutes, allowing gentle early interventions to prevent SAG mill stoppages. This translates into greater and more consistent throughput.
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