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Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles M Silva, A Casali⇑ Mining Engineering Department, Universidad de Chile, Beauchef 850, Santiago 8370448, ChileI203 I204 INTRODUCTION  ResearchGate,distribution of the ag/sag mill feed However, fluctuations in feed size However, fluctuations in feed size make such sizings valuable only if they can be done very frequently,Ø Effect of SAG Mill Feed Size Distribution and Ore ,I13 Figure 1: Concentrator Throughput and Availability Project to Date SAG mill availability has reached the design level, however throughput
Read MoreSAG 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/tonApplication of Operating Work Indices in Autogenous ,limited value in evaluating AGSAG and ball mill sections separately This problem arises due to the difficulty of This problem arises due to the difficulty of describing particle size distributions with different shapes by one number, the eighty percent passing sizeA Method of C alculating Autogenous/ SemiAutogenous ,Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 05 slope when plotted on loglog paper This is because the particle size distribution (PSD), these mills
Read MorePredicting SAG/AG Mill and HPGR Specific Energy Requirements Using the SMC Rock Characterisation Test SMorrell SMCC Pty Ltd Email: [email protected] Mill Optimization using Model Predictive Control,Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, MS, van der Westhuizen, AP, & Mainza, AN 2009)The SAG grindability index test  ScienceDirect,SAG mills operating in closed circuit with both finer feed and incircuit pebblecrushing would, therefore, show f SAG values approximately equal to product of the fine feed and pebble crushing correction factors, ie approximately 077
Read MoreSAG is an acronym for SemiAutogenous Grinding SAG mills are autogenous mills but 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% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motorA Method of C alculating Autogenous/ SemiAutogenous ,Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 05 slope when plotted on loglog paper This is because the particle size distribution (PSD), these millsSAG Mill Optimization using Model Predictive Control,Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, MS, van der Westhuizen, AP, & Mainza, AN 2009)
Read MoreTHE INFLUENCE OF MILL SPEED AND PULP DENSITY ON THE GRINDING EFFICIENCY 91 Graph 2 Particle size distribution for different mill speeds 688 % solids 734% solids 759% solidsChoosing a SAG Mill to Achieve Design Performance,Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, GrindingGold Fields Granny Smith Grinding Circuit: A Metallurgist ,After closedcircuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD)
Read MoreSAG mills, Morrell (1993) The mill with scats had a considerably finer size distribution, and notably lacks ball in the 40mm to 60mm size range This is the size at which the porosity is exposed, and they suddenly become smaller and nonspherical For a normal finer ball size distribution a finer grind and lower throughput would be expectedComminution Services  SGS,autogenous grinding as well as to SAG mill primary grinding In the SAG mill testwork when the steel is added the SAG product classification size and ore feed size distribution is varied If necessary, pebble crushing or mill speed can also be investigated All tests are evaluated on the basis of feed rate, power consumption and product size analysisACT Grinding Optimization System  Outotec,The Outotec ACT grinding optimization system utilizes feed particle size data from RockSense, charge analysis from MillSense, and slurry particle size measurements from PSI, as well as other available online measurements
Read Morecommercial SAG mill grinding conditions on 45 L of ore and determines the SAG mill pinion energy needed to grind ore from 80% passing 152 mm to 80% passing 17Paper # 25  Copper Mountain Overview on the Grinding ,Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm Effective grinding length (EGL) 5,334 mm Bearing type Partial Journal, 120 degree bronze insert Bearing size 2,950 mm diameter by 660 mm wide Bearing material Bronze Bearing lubrication type Hydrostatic dual pocket Table 2 and 3 include the process and operating data for theComminution Services  SGS,scale SAG mill, the SPI® test SAG product classification size and ore feed size distribution is varied If necessary, pebble crushing or mill speed can also be investigated All tests are evaluated on the basis of feed rate, power consumption and product size analysis Unless singlestage autogenous grinding must be considered, we recommend that the secondary ball or pebble mill circuit
Read MoreAG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball millComminution  Wikipedia,Comminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes [1] [2] In geology , it occurs naturally during faulting in the upper part of the Earth's crust [3]SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY –,commercial SAG mill grinding conditions on 45 L of ore and determines the SAG mill pinion energy needed to grind ore from 80% passing 152 mm to 80% passing 17
Read MoreSemiautogenous grinding (SAG) mill performance is influenced by ball charge, rock charge and feed properties which are di_cult to measure directly The development of inferential measurement models of SAG mill total charge and ball charge levels, feed rate and size distribution, and, mill dischargeUSING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE,If a ball mill circuit were to be fed 2 distributions, each with same P80 but with the open and closed circuit gradients in Figure 1, the closed circuit distribution would require more energy to grind toACT Grinding Optimization System  Outotec,The Outotec ACT grinding optimization system is a customized control application for grinding circuits It ensures stable conditions in the grinding circuit, optimal particle size for downstream processes, and increased throughput with minimized energy usage The Outotec ACT grinding optimization system utilizes feed particle size data from RockSense, charge analysis from MillSense, and slurry particle
Read MoreMinerals 2016, 6, 127 3 of 9 back to the SAG mill This causes a higher variation in the feed rate and particle size distribution in the feed to the SAG mill, which results in a greater variation in the SAG mill power draw in the transitionMetallurgy & Mineral Processing  SRK,of feed size on mill throughput No 48 SRK Consulting’s International Newsletter One of the most valuable aspects of blasting is the generation of very fine particles (eg, smaller than 12mm) that will pass through the primary mills and onto the secondary ball mill circuits, alleviating a common bottleneck Modifying blasting practices to achieve a more suitable mill feed size – which Grinding in Ball Mills: Modeling and Process Control,rotation, the mill loading, the final product size required from a given feed size (coefficient of reduction), the work index of the material, the mill shaft power and the specific gravity of the material
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