Mill in Brazil and Lumwana having a 38ft, 18 MW SAG and one 26ft, 16 MW Ball Mill in Zambia, all three mills put in operation in 2008, as well as Los Bronces, Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of MW commissioned in 2011. In the light of increasing interest in that technology various ...
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Mineral grinding is one of the most important and critical stages in copper mining. Economyscale has motivated the use of high capacity semiautogenous (SAG) mill units whose continuous operation is essential to mine profitability. Hence, the development of modeling tools of SAG mill drive systems that help to analyze and prevent costly longtime outages, are of great benefit. This paper ...
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The various options available for larrsepower semiautogenous grinding (SAG) mill drive systems are examined, together with their impacts on mill design and relative capital and operational costs. A brief history of largemill drive systems is given. Stateoftheart mill design and mechanical design considerations are also discussed.
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The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. ... 2001. A mechatronic solution Design and experience with large gearless mill drives. In Proceedings of the SAG 2001 Conference, Vancouver, Canada. [7] Meimaris, C., Lai, W. K. K. L., Cox, L., 2001
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Driving into Canada from the is relatively simple compared to other destinations. Travelers driving into Canada from the must have a valid, such as a passport. Unlike most of the world, a passport card is also accepted on the land border. Children under 16 need only show proof of citizenship.
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As a result, ABB developed three of the largest diameter and most powerful drive systems for a SAG and two ball mills installed at the highest altitude to date. The fully integrated and optimized solution for the grinding circuit consists of: 1 x 28 MW GMD to power the 40 ft SAG mill. 2 x 22 MW GMDs to power two 28 ft ball mills.
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E Primary SAG, 34x1 6 Two variable speed ac motors coupled mill, 4 million 22,500 to a gear drive with air clutches. motor, million each 6000 Two secondary ac synchronized motor coupled to a gear mill, million ball mills, 18x27 drive with an air clutch. motor, 602,000 6050 F Ptimary SAG, 34x16 Ringmotor system. mill, million ...
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TABLE OF CONTENTS. SAG 2011 Conference Workbook Sunday Morning Mill Internals Time Paper Title, Author 8:00 8:20 8:40 9:00 9:20 9:40 10:00 10:20 10:40 11:00 11:20 11:40. Autogenous and Semiautogenous Mills 2010 Update, Stuart M. Jones, Jr. and Moris Fresko Simulation as a Tool to Enable Worlds Best Mill Relining Practice, Peter Rubie Quantifying the Influence of Liner Shape on Mill Filling For ...
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The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed. The feed in the mill contains fractions of ore that serves as the grinding media. Larger ore fractions break the smaller particles but also breakdown themselves and exit the mill as a product.
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Strain gauges were attached to a ball mill which is approximately m in diameter and 11 m long flangetoflange at the locations shown in Fig. measurement locations at gauge sets (A, B) and (D, E) correspond to the recommended locations for derivation of the hotspot stresses in BS7608 (1993),, they are and away from the adjacent weld toe in the shell, where T is the ...
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the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment ...
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. FullerTraylor SAG/AG Mills range in size from through in diameter with powers as high as 28,000 kW.
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As part of a twoyear service contract, Siemens will continue to support the drive technology implemented in the SAG mills 1 and 2. In the island state of Papua New Guinea, Ok Tedi Mining Limited (OTML) runs the copper and gold mine Ok Tedi. OTML's drive train infrastructure at the Ok Tedi mine is in excess of 30 years old.
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In Figur e 8 the starting torque profile is shown for a SAG Mill. ... This article reviews various mill drive configurations and improved SM characteristics when used with advanced drives. It will ...
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Mount Milligan is a new copper and gold Pushing the boundaries project located some 1,000 km north of With a diameter of 40 ft, the SAG mill is one of Vancouver in central British Columbia, the largest in operation in the world. ABB states Canada.
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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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1. Introduction. Mill filling has a dominant effect on grinding mill performance (Apelt, Asprey and Thornhill, 2001), and therefore, its accurate measurement is vital for modelling grinding mill 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 ...
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In addition to that, the smaller particles (less than a millimetre) will easily pass through the SAG mill. Both these effects will help the SAG grinding circuit, but will put more pressure on the ball mill grinding circuit. Download : Download highres image (173KB) Download : Download fullsize image; Fig. 13. SAG Feed PSD of UCS 100 [MPa ...
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the NPC calculation is an important factor in the grinding mill selection, other factors, such as reliabil ity of mill drives and power source, are important elements in the decision making process. This article examines how the NPC calculation, plus reliabil ity and power source, influence SAG mill selection. SAG mill drives
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This paper presents the technical details of the world's first 42 foot diameter 28 MW gearless SAG mill, installed at the Conga coppergold project in Peru. It explains the challenges and solutions for designing and operating such a large mill, and how it delivers high efficiency and low maintenance costs.
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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In June 1998, the world's largest grinding mill, the 40 ft ( m) diameter 20 MW Cadia gearless SAG mill, was commissioned. This was a leap of over 40% above the largest operating SAG mill. A significant saving in capital cost gave the ... The unique drive must include the following in the production program (, failure of rolls at design ...
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Solution The problem was solved by replacing the existing drive with a watercooled ACS1000 medium voltage drive. ABB's ACS1000 soft starts the motor, allowing smooth ramp up, and allowing the motor and the SAG mill to run at the required load output.
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The world's first two 40' SAG mills are driven by GMDs rated at 20 and 21 MW respectively. But during the last three years, several GMDs for 40' mills have created a trend for larger powers from 22 through to 28 MW.
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The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive's mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical
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