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and torque draw superimposed on the relevant motor capability curve. Such plots for an example mill, the SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3. Any time a process line (green) touches or exceeds the corresponding motor limit (the red or blue lines), the motor is at risk of tripping due to high current
Jun 06, 2016 SAG Mill Design and Specification . The Kidston plant was designed to process 7500 tpd fresh ore of average hardness; but to optimise profit during the first two years of operation when softer oxide ore will be treated, the process equipment was sized to handle a throughput of up to 14 000 tpd. ... Motor torque at full load current is 214.4 kNm
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I am more concerned about the cases where the center of mass of mill shifts to a new position, thus causing extra torque and more power consumption. Generally, it happens when you have coarse and/or hard ore going to the SAG mill, its center of mass shifts to a new position and mill drive consume more power because of the extra torque generated
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mill diameter, mill length, grates openings, and pebble ports size; the power equation is also function of all the operational variables selected for this study. The applied force is a function of the mass inside the mill and it is composed of balls, ore and water. The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)
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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
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graph looks practically identical to 3 in [1], which showed speed and torque ... By slightly reducing the torque, the mill rolls gently back until the charge is bal-anced. Because the torque is always ... (SAG) mill utilizes less steel balls for grinding in addition to the ore (pieces of rock), and it is
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SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill
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May 01, 2017 Therefore, the torque of end-walls independent from the drum is worth studying. The aspect ratio of a SAG mill is usually low (the aspect ratio of a product from CITIC Heavy Industries Co. Ltd. is 0.49, ∅ 11 m 5.4 m), and the aspect ratio of the experimental mill
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A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential features of a model for mill power. The torque required to turn the mill is given by Torque T Mcgdc T f (8.9) Where Mc is the total mass of the charge in the mill and Tf is the torque required to overcome friction. Power 2 NT (8.10)
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voltage sag which could lead to vapor lighting extinguishing. ... resistance to ensure the mill motor would develop ample torque to accelerate the mill. The nominal three phase voltage level of the system is run at ... shows a typical motor torque speed curve. Figure 3: Typical Motor Torque vs. Speed Curve
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SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells. The load cells are calibrated to measure the total weight of water, grinding media (balls) and ore in the mill
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SAG mill. e simulation results were compared with the eldrecorddataduringstart-upandshutdownoftheSAG mill. Guerrero and Pontt [] investigated the oscillatory torque caused by dead time in the current control of a high-powergearlessmilldrive.Szolcetal.[]examinedthe interaction of the electromechanical coupling of an asyn-chronous motor drive system
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Dec 01, 2006 The grinding curve is the product size as a function of feedrate, for a fixed feed size. It is proposed that for each new milling condition, in this case a change in the percentage of ball scats in a mill, the peak in the grinding curve must be sought, and
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Sep 17, 2013 As per Torque / Slip characteristic for AC Motor, the value of the Max. Torque can be developed is constant while the Starting Torque occurs @ S=.1, (T proportional to r2 and S also proportional to r2 where r2 is the rotor resistance, the ratio r2/x2 when equal to 1 gives the max. Torque w.r.t Slip at Starting
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ball mill torque curve – SAM Machine. ball mill torque curve … .. a startup curve between torque and rotational speed for a ball mill … 120% to 130%, General machines with ball or roller bearings
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Torque: The torque output of a motor is the amount of rotational force that the motor develops. The torque of a small electric motor is commonly measured in either inch pounds (in-lbs), Newton meters (N-m) or other directly converted units of measure. Since the rated output power of a motor is a fixed value, speed and torque are inversely related
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saw mill lines. Indefinite shape Materials with an indefinite shape, such as various food products, plastics etc., are processed with plant equipment. Examples of this kind of equipment are margarine stirrers, and different kinds of centrifuges and extruders
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