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There are two types of SAG mill drives. Power is transmitted to the grind-ing mill either through a pinion and ring.
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BrainWave SAG mill led to an extra 20M USD worth of annual copper produc-tion at Los Pelambres. Screen capture showing improvement control with BrainWave. AT.BW-sag.15.en.08.15 ANDRITZ Inc. Atlanta, GA, USA Phone: +1 (404) 370 1350
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sag mill fl filetype pdf. SAG mill and two 26 ft ball mills, all made by . The drive systems that enable the mills to operate at benchmark levels of reliability, efficiency and availability were made by ABB, whose solution comprises a 23.5 MW gearless mill drive (GMD) for the SAG mill, and two 13 MW low-speed dual-pinion ring-geared mill drive (RMD) systems …
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I-221 EFFECT OF SAG MILL FILLING AND SPEED In this work, the South Deep SAG mill was stabilised at a range of fillings varying between 20% and 45% of total mill volume.
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PDF | The new practice of applying full pre-crushing of SAG mill feed to substantially increase throughput is challenged as retrogressive and... | Find, read and cite all the research you need on ...
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critical speed [5]. Figure 2 shows the average power draw of the mill with the different lifters. It appears that the mill power differs slightly for the different lifter shapes with the same face angles of 20. o. The mill with rail lifter would relatively require higher power, and with the high-low (Hi-Lo) lifter it does lower power.
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Parameter Optimization of Large Sag Mill Liner Based on DEM and Kriging Model Ruihua Jianga, Guoqiang Wanga*, Jingxi Lib, Kang Kang Suna, and Yajuan Houa aSchool of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130022 P. R. China *e-mail: wanggqjlu@163
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While the VSI Mill may have some benefits in certain applications such as tertiary crushing or producing sand for construction purposes, it still remains a relatively niche technology within the mining industry. SAG Mill. A SAG mill, also known as a semi-autogenous grinding mill, is one of the essential equipment used in copper ore mining.
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There are two parts to SAG mill design best practices. First is to choose the SAG mill (chamber size and power discussed above) that will process the design feed every day, …
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Learn about SAG and AG Mills, which use ore and balls or pebbles to grind ore in mining operations. Find out how FL offers robust, efficient and customised mills in …
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predicting liner wear and fine-tuning optimum conditions for SAG mill operation. CASE SCENARIO Consider a large SAG mill with a diameter of 10.97 m, as shown in Figure 1a. The mill has a hi–lo liner design with alternating rows of high and low lifters (Figure 1b).The mill processes rocks of 200
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3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
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AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING Logan Lake, Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The
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> Engineering approaches have highlighted mill performance with mill modelling and the use of improved materials > Liner design,with the advent of large diameter SAG mills, the issues of design, selection, monitoring and evaluation of mill performance is critical > Mill trajectory modelling can be used to great effect in improving liner design
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Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
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It can be very difficult operationally to trade grind for throughput in an SAG circuit—once designed and constructed for a given circuit configuration, an SAG mill circuit has limited flexibility to deliver varying product sizes, and a relatively fixed unit power input for a given ore type is typically required in the SAG mill.
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There are two parts to SAG mill design best practices. First is to choose the SAG mill (chamber size and power discussed above) that will process the design feed every day, including those days when mostly hard ore is available. Second is to engineer the grinding plant so that optimization can be done quickly.
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Learn how to design and operate SAG mills that achieve design tonnage from day 1 and year 1, using power based methods and ore hardness measurements. This paper …
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Learn how to choose a SAG mill to achieve design performance based on ore hardness variability and grinding efficiency. See examples of test work, pilot plant …
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Introduction. History is that mill liners have evolved over time. Liner design has a significant effect on mill performance and liner life. Engineering approaches have highlighted mill …
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general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.
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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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the SAG mill and the key testwork data is given in Table 1. The total weight of the emptied out charge was 62.2 tons making up a total mill (slurry) filling of 43 % and a ball load of 22 %. The ...
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To a more significant degree than in other comminution devices, SAG Mill Liner Design and Configuration can have a substantial effect mill performance. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered. Each of these topics has had a considerable amount of …
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or some other design point, based on what is achievable to feed the SAG mill considering the mining method. Mine design is an important part of SAG mill design. 80 th Percentile Design: Recommended design point for most new plants. Typically the SAG mill will be 10 to 15% larger (more power) than an average ore design. Other design points
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The Impactmeter is an advanced SAG mill performance monitoring instrument developed to measure load generated impacts and provide mill liner protection through the use of …
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The ROM SAG mill circuit—a brief description The typical ROM SAG mill circuit is depicted in Figure 1. The circuit is usually closed with either a screen or, more commonly, a cyclone for product size classification. The focus of control can be divided into two parts, viz. the mill and the cyclone. The importance of cyclone performance should ...
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Greenfield design of an AG/SAG-ball mill circuit with JKSimMet, the additional power requirement in the ball mill(s) is determined with the Bond ball mill work index and the phantom cyclone technique. COMMINUTION Trusted Bench Scale and Pilot Scale Comminution Expertise Across Canada. We offer two in-depth simulation options ...
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SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. This paper will compare SAG mill models by Morrell, Loveday (using "Power Numbers" published by Barratt) and Austin against several published mill surveys.
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Given the impact that SAG mill performance has on overall plant performance, operators also have to pay attention to the design and construction of ancillary equipment, such as trommels, to avoid stoppages or loss of throughput from breakage, unexpected wear or loss of processing capacity. ... FL 32224 USA +1 904 721 2925 subscriptions@mining ...
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To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN; Use Add New Topic to ask a New Question/Discussion about Grinding.; OR Select a Topic that Interests you.; Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.; …
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SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., the …
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was initially controlled by the SAG mill power dra tO withbearingpressureasoverride. Ballloadsare8%ail 10% for the SAG mill and 40% for the secondary 11 (/ mill. Figure 4 depicts this grinding circuit. The SfttJl mill, in closed circuit with two 1.83-m-wideby 6.71--< stationaryscreens, typicallyproducesa grindof ksO ~ 780 um.
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This paper presents the structure of the latest version of the JKTech autogenous and semi-autogenous (AG/SAG) mill specific energy model, which is an adaptation of that …
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purposes, SAG mills utilise a combination of steel balls and coarse ore to achieve the desired discharge particle size [2]. An essential performance metric for a SAG mill is its throughput, which measures the volume of processed ore per hour [3]. SAG mill throughput maximisation stands as a critical priority, given its profound financial outcomes.
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SAG mill circuit No. of mills # 1 SAG mill motor power installed kW 28,000 Motor type Gearless Mill manufacture FL SAG mill dimensions diameter length 40 ft (12,192 m) 26 ft (7,924 m) Mill direction Bi-directional Mill speed – range % critical 0-80 Mill speed – nominal % critical 76 SAG mill specific energy kWh/t 6.6 Grinding media Mm 125
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