(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia Villanueva, 2013 [1]).
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The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four MW GMDS are employed in 26 football mills along with associated control systems.
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SAG Mill Process Control What do you prefer? Controlling Weight (within a range) by manipulating mill speed and keeping a constant feed rate? Controlling weight by manipulating feed rate? Oberstorm 8 years ago Like Where do you see maximizing throughput subject to load maximum and upstream/downstream process constraints? Marshal Meru 8 years ago
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SAG mill operation is more dynamic, and typically requires a higher degree of process control sophistication. Though more complex in AG/ SAG circuits relative to the crushing plants they have largely replaced, these issues are well understood in contemporary applications.
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SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement, by either bearing pressure transducers or load cells, is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint use for process control requires regular review ...
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Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ball mills. In the case of SAG mills, this requires two separate filling measurements: one for a crashstop and one following a complete grindout to quantify ...
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Introduction SAG and ball mills are generally accepted as the largest power consumers in a mining and mineral processing operation and can be 80% of total electrical energy consumed at a specific power consumption of around 20kWh/ton.
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Describe the components of ball mill. Explain their understanding of ball mill operation. Explain the role of critical speed and power draw in design and process control. Recognize important considerations in ball mill selection. Reading Lecture. In ball mills, steel balls or hard pebbles to break particle based on impact and attrition.
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For both SAG and Ball mills, an efficient brake system to control and halt their massive rotating mass is essential. In this article, we will delve into the intricacies of SAG and Ball mill brake systems, focusing particularly on the hydraulic systems, inching mode, and the superiority of Johnson Industries brakes.
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It is not unusual to find SAG mills up to 40 feet in diameter and Ball mills of 26 feet. Motor power is ever increasing with current designs producing upwards of 20MW. ... Sossego 38' x 23' Long SAG Mill. The normal control modes for a mill achieve these functions electrically using the flexibility and power of the motor. The braking system can ...
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After extraction in the openpit mine, the ore is crushed in a huge 40foot semiautogenous grinding (SAG) mill and two 27foot ball mills, all three of which are driven and controlled by ABB gearless mill drive systems with a massive power output of and megawatts respectively.
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Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.
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Now I finished the calculation of flowsheet with precrushing, SAG mill and Ball mills. The result is follows: 1. Precrushing three crusher MP2500() for crushing from 300mm to 50mm. Two working and once in reserve. 2. Primary grinding once SAG mill with size 42ft x 24ft, power motor 28MW. F8050mm, p80 2mm. 3.
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SAG / Ball Mill Monitoring Condition Monitoring to Ensure Reliability for Critical Grinding Equipment in Mining Today's mining operations must keep crucial milling assets online and running optimally, but variations in ore particle size, feed rate and moisture content, can lead to plugging, high vibration and machine bearing wear, and ultimately unscheduled stoppages and laborintensive ...
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In large capacity SABC circuits operating at high SAG mill ball load, ball mill capacity is often a limiting factor. Figure 1 IMPACT OF FEED SIZE ON SAG MILL SPECIFIC POWER FOR ORES OF MODERATE TO HIGH COMPETENCY. To counter high ore competency, the ball to rock ratio can be increased and/or the ball size increased.
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Control of pressure drop across the cyclone is easily accomplished by providing one or more of the cyclones in the cluster with automatic valves so that they may be added to or deleted from the circuit as operating conditions dictate. Measurement and control of the rate of addition of new feed and water to the primary mill is relatively easy.
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Effective SAG mill control will maximise throughput, minimise damage to mill internals (liners and lifters) and contribute significantly to achieving maximum recovery in flotation. Well designed and implemented SAG control will payback in weeks not years. SAG mill control is essentially the stabilisation of mill load (and/or power) and density
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That does not mean that the preference is speed control over feed rate control. Each ore is different and each plant is different. As equipment designers, we have to provide each of the features that the operators could use to optimize their process. In my experience, SAG Mills are normally variable speed, and Ball Mills are normally fixed speed.
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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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AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), SemiAutogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator ... P xx Passing size control [%] Product size setpoint required in open circuit Process Condition. Abrasion Index (Ai)Power Required Metallurgical. Description. Value Units ...
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Current operational results show that the SAG mill is operating at 5% ball charge level by volume and is delivering a K80 800 micron product as predicted. Power drawn at the pinion is 448 kW, kWh/tonne (SAG mill) and 570 kW, kWh/tonne (ball mill) when processing mtph, for a total of kWh/tonne or % above the ...
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As there are no SAG mills and no ball mills in the HPGRHPGR circuit there are additional savings in CO 2 from the fact that steel ball consumption is zero. A further 15 megatonnes of CO 2 is therefore estimated to be potentially saved, giving a total saving of megatonnes of CO 2 or % compared to a AG/SAGBall mill circuits.
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The Mill Control System provides all control functions required for the safe operation of grinding mills and their associated lubrication systems, as well as continuously monitoring the equipment's condition. ... The Tube Mill Reline Machine is a compact relining solution for smaller SAG and ball mills. Mill equipment transporter.
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semiautogenous grinding (SAG) mills and is the fourth paper in a series of five papers on Inferential Measurement of SAG Mill Parameters. The development of the inferential measurement models of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, is summarised.
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SAG and ball mills are the most critical equipment in MM process Wireless Temperature Monitoring avoid damages and unplan shutdowns When the mill is overloaded with more minerals than it can grind, energy consumption increases, and temperature in the poles as well, it would damage the motor and stop the mill.
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SAG and ball mills are the most critical equipment in MM process. SAG and ball mills are the most critical equipment in MM process. Click to view our Accessibility Policy and contact us with accessibilityrelated issues; Skip to Navigation; ... Automation Control Software.
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The acoustics of the mill charge motion is measured by a device mounted adjacent to the SAG Mill shell. The resulting signal is transmitted to the acoustic indicating controller which, in turn, sends a remote set point to the SAG mill speed controller.
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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′ () in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ () diameter and a power of 35 MW (47,000 ...
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that controls the IP of the SAG Conferences held every 45 years in Vancouver. Outline •Ore breakage ... This pebble crushing arrangement sends crushed pebbles to the ball mill feed instead of the AG/SAG mill. It boosts the throughput of the AG/SAG mill (because there is no recycle), but loads the ball
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Emerson can help you achieve higher availability in SAG and ball mills and high pressure grinding rolls with advanced condition monitoring solutions to detect issues early. Emerson's advanced process control solutions can help optimize your grinding and milling circuits and achieve a more consistent grind while reducing energy consumption.
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The proportion of SAG and ball mills in producing the final product (particles finer than 74 µm) was % and % respectively. That is, the SAG mill produces about % more than the ball mill in the final product. The average consumed energy at SAG and ball mills to produce one ton of final product was kWh/t and kWh/t ...
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SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and NapierMunn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is one approach to stabilize the mill
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Semi Autogenius Grinding (SAG) Mill Back. Cyclone Control; Expert Cyclone Control Cyclone Control Back. Acid Plant; Emissions Analysis Acid Plant Back. Flotation; Dart Valve Automation ... Mill Process Control Automation Control System Back. Ore Receiving; Solids Level Measurement Smart Meter Verification Ore Receiving Back. Conveying ...
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Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ball mills. In the case of SAG mills, this requires two separate filling measurements: one for a crashstop and one following a complete grindout to quantify ...
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