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Variable speed was required for the SAG mill. Various options were considered to meet the specified speed range of 65 to 85% of mill critical speed, and the final selection was the IES Hyper-Synchronous drive Slip Energy Recovery (SER), in conjunction with Wound Rotor Induction motors (WRIM). This was deemed to be the most cost effective solution for the required speed range of 70 to
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in this work, is presented in Fig. 1. Also shown are the main SAG mill variables included in this study. All others were discarded due to its low availability or because the requirements of the mod- els developed in this work. The lever arm is the basis for the power models. The power is usually calculated as torque multiplied by the rotational speed and torque is equal to the force applied
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Specific energy model on data of four SAG mills. • Models include the variable % −6″ +1″ in the SAG circuit fresh feed. Abstract . Comminution, particularly milling, is on average the largest consumer of energy in mining. Actual comminution circuits consist in most of the cases in coarse crushing, SAG milling, pebble crushing and secondary ball milling. In these circuits the SAG mill
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3 SAG mill (8 – 15% ball charge) Variable or moderate competency ore with the competency suiting the selected grind size Tarkwa, Leinster, Golden Pride, Obatan, Henty, Fosterville, Kittila, Cosmos, Cosmic Boy, Jundee, Tanjianshan 4 High ball charge SAG mill or ROM Ball mill (15 to 25% ball charge) Low competency ore Hidden Valley, Nzema, Sepon, UG2 ores (South
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The mill is driven by two GE horizontal synchronous variable speed motors, one of which is depicted on the bottom right. SAG mill feed is conveyed from the coarse ore stockpile. The ore passes through a gyratory crusher where it is reduced to 8 inch diameter before being dumped on the pile. A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting
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Milling - energy intensive and high maintenance, overcoming the challenges using frequency converters (English - pdf - Article) Ring-geared mills operated with frequency converter (much more than just variable speed) (English - pdf - Article) Use of the latest technology to overcome the demands of mill operation (English - pdf - Article)
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INGEDRIVE™ MV100 medium-voltage variable speed drive to be used for the mill drive at a greenfield copper mine in Nevada, USA. In the third quarter of 2018, The company FL awarded a contract to Ingeteam for the delivery of one medium-voltage variable speed drive from the INGEDRIVE™ MV100 family with the following characteristics: UL listed, air-cooled, 24 Pulse diode front end
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Variable speed allows to compensate for throughput changes as well as for harder ore, and to prevent meta-to- metal contact between the grinding media and the mill lin- ers. This leads to optimized operation and significantly less wear to the mill liners and ball consumption, as explained by a concentrator's operation and maintenance supervisor in the US. Furthermore, the mill
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LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the
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The SIMINE Gearless mill drives pump system significantly enhances concentrator productivity by eliminating the reducer gear between motor and pump and all corresponding maintenance. In addition, the cyclone pumps with variable speed can adjust their energy consumption to the optimized flow of pulp, resulting in energy savings of up to 30%. The
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• Speed range 85% - 110% rated speed • Variable speed operation of motors Control Solution: 1800 frame Toshiba V Series PLCs Power Challenges: Power Solution: Slip Power Recovery. • TMdrive-10SPR Slip Power Recovery drives • Continuously recovers an estimated 770 kW SAG Mill
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An inching drive is used as an auxiliary system to the main drive for a large machine such as a ball mill, industrial kiln, conveyor, or elevator. Its purpose is to turn the equipment at a speed slower than the normal operating speed — typically 1 to 2 rpm, although fractional rpms are also common — and to do so at high torque — typically 120 percent of the normal drive torque. Three
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Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.
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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. Use Add Comment = to comment on someone else's
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Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD). This solution was designed to control, stabilize and optimize mill operation. The technology
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In daily practise, the operator can operate a mill with a variable speed drive at any speed the grinding process may require, as long as: 1. The motor temperatures keep below the maximum values defined by the supplier, and 2. The current of the motor does not exceed its rated current value specified by the supplier. Figure 1 – Example motor torque available as a function of motor speed 0 0
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Fixed or Variable Speed Drives. Crusher Drives; Grinding Mill Drive Systems, SagBall etc; Slurry Pump Drives; Conveyor Drives; Examples of completed projects include:-Windimurra Vanadium Mine Project: Windimurra Vandium Mine Application: Ball Mill Equipment: 1 x 5500kW 6 Pole 11000 volt Wound Rotor Induction Motor Location: Mount Magnet, Western Australia
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variable interaction, which are characteristic of the -Autogenous Grinding mill weight control Semi problem. KEYWORDS SAG mill, model predictive control, MPC, expert systems, optimization, Laguerre . INTRODUCTION Mineral processing operations present many challenges for automatic process control due to variations in unmeasured ore properties, material
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variable-speed drives. Variable Speed Applications | 2. l High uptime l Unrivaled energy efficiency (less CO2 Emissions) l l Increases output and performance of SAG mill – improved process control and longer lifetime of equipment (more flexibility) l Better quality product – vertical mills (usually on cement industry) l High starting torque at low speed – maintenance positioning
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Specific energy model on data of four SAG mills. • Models include the variable % −6″ +1″ in the SAG circuit fresh feed. Abstract . Comminution, particularly milling, is on average the largest consumer of energy in mining. Actual comminution circuits consist in most of the cases in coarse crushing, SAG milling, pebble crushing and secondary ball milling. In these circuits the SAG mill
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