Lu et al. [2014] developed and implemented NEUSimMill, a real- time ball mill grinding circuit simulator, for testing and verification of real-time control system. In this work, a methodology for the development of distributed process simulation using OPC is presented. The case of semi-autogenous grinding (SAG) mill circuit control discussed …
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Many of the primary grinding mills installed in the last 10 years are very large semiautogenous or autogenous mills. These circuits are much more sensitive to changes in grinding characteristics of the ore than the conventional fine crushing, rod …
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Control of the total charge and the ball charge volume is vital to the optimum performance of semi-autogenous grinding (SAG) mills to maximise throughput and energy efficiency.
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process control in industrial ball mills remains an open problem motivating future research activities and comprehensive studies [2, 19, 26, 27, 48]. We shall conclude this section by mentioning ...
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operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in
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Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10 mesh (1.7 mm) ensuring that the ball mill will work efficiently.
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To stabilize and optimize the operation, ramp up production and prevent damages to the SAG mill liners, Cía. Minera Antapaccay contracted with FL to implement …
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The control strategy for the SAG mill is fairly basic. Parameters which can be adjusted are feed tons per hour and mill speed. ... Examples of the power requirement developed by a mill charge as mill speed increases have been added for a 10% v/v ball charge at different total mill charge volumes ranging from 15-30% v/v. It can be seen …
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With our SAG mill running at 65.4% critical speed (mill @ 8.7 RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately 1.2 MW of slip energy; the power ...
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Identify key variables for process control; Design features of grinding equipment (SAG, BALL and ROD MILLS) Explain typical flowsheets of grinding circuits involving single or combination of equipment; Reading & Lecture. Size reduction by crushing has a size limitation for the final products. If further reduction is required, below 5- 20mm ...
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Different types of mill are in operation e.g. rod or ball mills, so called depending on the steel based media placed internally to assist the grinding process. If no media is used i.e. the tumbling ore itself causes breakdown then the …
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The pairing mill combination of a SAG/Ball mill is common in copper/gold mines for that reason. This combination can aim for a fine product sizes are around typically 100-200 micron whereas a Vertimill or ISAMill are finer at 20-40 micron or smaller. ... Richard Travis replied to Grade Control on a Stockpile. DISCLAIMER: Material presented on ...
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These SAG milling plants (Fig. 1) are designed with few pieces of equipment having a large processing capacity, replacing advantageously a large battery of traditional crushers and rod and ball mills.These characteristics make SAG mills an excellent example of critical equipments whose continuous and stable operation is essential to …
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Learn about the factors and methods of designing and developing semi-autogenous grinding (SAG) mill liners, such as shell lifters, end-liners and grates. See illustrations …
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Published in MATERIA 2021;2-3:63-66 The idea of mine-to-mill optimization has been tested in various mines in last decades, resulting in higher mill throughput in many mines, but also ...
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The simulator implements the dynamic ball mill grinding model which formulates the dynamic responses of the process variables and the product particle size distribution to disturbances and control ...
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SAG Mill Operation. SAG mills operate differently from ball mills, which rely on the impact of balls to break down the material. SAG mills use a combination of impact and attrition to grind the material. The grinding media in a SAG mill are larger than in a ball mill, and there are fewer of them per ton of ore.
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the mill and its ball charge moving, any in - crease in production yields a corresponding reduction in specific energy per ton. What is more, stabilizing the load in the mill ... ing expert system and DCS-based controls. SAG mill #1 load control Plant staff, after extended testing and rigourous data analysis, determined that
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Join the discussion on how to optimize SAG mill performance by controlling weight, speed, feed rate and power draw. Learn from experts and operators about different ore …
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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 …
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Mining operations must keep crucial milling assets, like semi-autogenous grinding (SAG) ball mills online and running optimally, but ore variations lead to plugging, high vibration and machine bearing wear, leading to stoppages and restarts.
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In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling three ...
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High cost-effectiveness CITIC HIC grinding mills are recognized as China's Manufacturing Industry Single Champion Product. CITIC HIC is responsible for setting the national standards of semi-autogenous mills (SAG mills) and ball mils, supported by powerful database, optimized process technology, cutting-edge design concept, and 60 years of …
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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 Napier-Munn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is one approach to stabilize the mill
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By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...
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There are good and bad control techniques for SAG and Ball mill operation used in the industry. It is difficult to get an online measurement of ore hardness that can be used for process control.
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Recent developments in low power wireless and Digital Signal Processing (DSP) technologies have given rise to a new system that can monitor vibrations in real-time on the rotating surface of SAG, AG, and Ball mills. Specifically designed for the SAG mill, a new device is presented that digitizes and processes vibration from three key points on the …
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OPTIMAL SAG MILL CONTROL USING VIBRATION & DIGITAL SIGNAL PROCESSING TECHNIQUES. Recent developments in low power wireless and Digital Signal …
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"A subpar control system could lead to an up to 20% efficiency loss by failing to meet throughput or grind targets," noted Rajiv Chandramohan, global technical director, ... a SAG-ball mill circuit can consume the same weight in steel used to construct the entire milling circuit structure. Improving the wear life of mill liners is one way ...
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This would be achieved by connecting the expert system to the highest level of control ie provide the set points for the controllers (Elber, 1989). Over the last year or so further Help packages have been implemented. These are:a) HelpSAG Designer - used by Morgardshammar, a leading Swedish mill manufacturer, for optimizing SAG/Ball Mill …
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A comminution model is developed for ball mills using the principles of perfect mixing. T-lines are developed from data arising from single particle breakage tests using a laser monitored, twin ...
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Tower Mills were developed to overcome some of the limitations of both ball mills and SAG mills. They can handle finer feeds than ball mills and have higher energy efficiency thanks to their vertical design. ... Unlike other grinding mills, the VSI Mill offers more control over particle size distribution. It can produce both coarse and fine ...
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A theoretical analysis was made of the motion of an isolated rod or ball, and the way in which it is influenced by a lifter bar of any face angle and of any height.
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With improved SAG mill control stability, the mill load can be optimized to increase crushing performance and produc-tion capacity. Along with the potential for greater …
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