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CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O I SKARIN, Senior Researcher, Candidate of Engineering Sciences N O TIKHONOV, Head of Subdivision Optimization of ore pretreatment and selection of the ap-propriate equipment is one of the main areas of activity of RIVS Science and Production Association

Know MoreMar 10, 2017· I suppose its best to start at the beginning and talk about the basics of controlling a SAG mill We have all become accustomed to using bearing pressure and power to control a SAG mill ,

Know MoreThe Bond rod mill work index is used to calculate the power requirement at intermediate size, ie from 125mm to about 1mm The test has been mainly used for the design of rod mills or primary ball mills, but it can also be used along with the other Bond tests (BWI and cWI) for SAG mill design using semi-empirical relationship [6]

Know Morebreakage tests do not include ball mill grinding data Based on the 2009 CIM paper (Starkey and Samuels, 2009), the ratio of SAG to ball mill grindability is an important factor in achieving a reliable SAG mill circuit design because that ratio reveals the best and most practical split for SAG and ball mill energy for the ore being tested

Know MoreThe plan, which is the result of a comprehensive data analysis and stakeholder input process, demonstrates the company’s adoption of additional lower-cost renewable resources to meet customer needs and support for its phased coal transition PacifiCorp operates as Pacific Power in Oregon, Washington and California

Know MorePrepared capital project scope and justifications for Gearless Mill Drives converter upgrade for Ball and Sag Mills to new Sinamics system Od drive became obsolete in 2015 Organized Siemens to come to site to carry out engineering study and put up presentation to senior management to justify need to do upgrade Total project cost is $6m

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Know MoreNov 25, 2015· An updated data set for sag mill power model calibration 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

Know MoreWhich power model is the most efficient to predict the correct power consumption in sag mill with change in process variables?I have developed a few dynamic simulators for different mineral/metal processing plants Prediction of correct sag mill power consumption with a change in ore hardness, solid

Know MoreModelling 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, Chile

Know MoreTwo new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill size; balls charge level, solids concentration in the SAG mill feed and % of critical speed, but adding a ,

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Know MoreSAG mill power draw simulation using variance propagation approach , simulation for the Sarcheshmeh SAG mill power draw showed that the mean is slightly higher than calculated, (94411kW), while .

Know MoreA linkedin group was recently discussing this by asking: I’ve tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data (2) Using SAG Power Index (SPI) data (3) Using the 1989 Barratt method updated on Alex Doll’s Web site (February 16, 2015)

Know MoreSAG Calculator Determine sag of a surface based on radius of curvature and diameter Calculator can be used to provide simple mechanical parameters that simplify specification of optical components Commonly used for lenses and mirrors

Know MoreMining, Mineral Processing & Power Plant Equipment for Sale since 1999 We offer the most reliable choice for all kinds of Ball Mills, Rod Mills, Pebble Mills, SAG Mills, Mine Hoists, Crushers, Synchronous Motors, DC Motors, Flotation, Mixers, Pumps, Diesel Generators, Natural Gas Generators and all the Mining Equipment you require

Know MoreGROSS POWER CALCULATOR General , estimate of the power that may be going directly into the grinding process , power draw of an AG/SAG mill to drop can be gauged by switching the discharge mechanism choice in the model from grate to overflow when predicting the power draw of an AG/SAG mill

Know MoreABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability ,

Know MoreOct 24, 2018· A comparison of SAG mill power models Procemin 2013 October 17, 2013 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

Know MoreThe total power for the HPGR system can be compared to that of a conventional circuit, based on the rod and ball mill work indices and the Third Theory of comminution The power comparison can also be done against AG/SAG mills This methodology has only been used to scope the potential energy savings of HPGR at small scal

Know MoreModern Processing Techniques to minimize cost in Cement Industry VK Batra, PK Mittal, Kamal Kumar & P N Chhangani Holtec Consulting Private Limited, Gurgaon , Vertical Roller Mill (VRM) The power used for the actual grinding process while grinding raw materials, depends mainly on the hardness of raw materials and the type of .

Know MoreBall mill - Wikipedia The general idea behind the ball mill is an ancient one, but it was not until the industrial revolution and the invention of steam power that an effective ball milling machine could be built

Know MoreSAG mills use a ball charge of 8 to 21% The largest SAG mill, Get Price Mill Power_SAG Millsxls - 911 Metallurgist The Net Power Demand of a SAG mill may be well estimated by the simple , of the mill charge (balls, rocks and slurry) to the total net power draw of the mill : Get Price Chge Dynamics in Tumbling Mills - Pure

Know MoreFor the mining industry, our semi-autogenous (SAG) grinding mill uses a minimal ball charge in the range of 6-15 percent It is primarily used in the gold, copper and platinum industries as well as in the lead, zinc, silver, and nickel industri Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding .

Know MoreSAG mills mimic the same shortcoming It follows that in order to obtain the speciﬁ c energy (SE) to achieve a certain transfer size, based on the 80 per cent passing value, an inefﬁ ciency factor must be applied to the SE of single stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method

Know MoreIn a previous paper (Morrell, 2008a) an approach was described which enabled the specific energy of tumbling mills such as AG,SAG and ball mills to be estimated from laboratory-derived ore characterisation data The following paper extends this approach to encompass jaw, gyratory and cone crushers as well as High Pressure Grinding Rolls

Know MoreUSING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE , can be used to conduct AG/SAG mill and crusher circuit simulations through the use of JKSimMet Independent of this it can be used in power-based calculations, which in conjunction with the Bond , using the motor input power less the no-load power

Know MoreThe optimizing level maximizes Power Draw using an online gradient estimation of the nonlinear function between Power Draw and mill Hold Up The results show that is possible to operate the SAG Mill in the optimal zone, compensate unmeasurable disturbances and maximize throughput without violating operational constraints 11

Know MoreThe optimal ball diameter in a mill 333 The grinding efficiency of the narrow particle size fractions with ball charge of various diameters has been observed through the constant of milling rate k in the equation of the grinding kinetics law for the first order grinding R=R 0

Know MoreGeometallurgy relates to the practice of combining geology or geostatistics with metallurgy, or, more specifically, extractive metallurgy, to create a spatially or geologically based predictive model for mineral processing plants It is used in the hard rock mining industry for risk management and mitigation during mineral processing plant design It is also used, to a lesser extent, for .

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