SAG is an acronym for semiautogenous grinding SAG mills are autogenous mills that also 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 38000 HP motor...We serves many industries, including construction crushing: jaw crusher, sand making machine; industrial milling: ultrafine grinding mill, raymond mill; ore beneficiation: ball mill, magnetic separator; green building materials: rotary dryer, dust collector; tails treatment: briquette machine.
Get PriceFinal commissioning of Kansanshis 12MW SAG and 58MW Ball mills particularly with the mill often regarded as the heart of a mines operation being serviced the mill can be operated in fixed speed mode while repairs are made
Get PriceIf the SAG mill is not intended to be the ratelimiting step in a process plant then it is best to adjust the SAG load and power to hold a constant tonnage to satisfy another constraint elsewhere Underground mines are an example the hoisting capacity of the mine shaft is the ratelimiting step in the process and the SAG mill must adapt to
Get PriceNov 26 2019 The selfreturning device is located in the revolving part of the mill and the material forms a selfcirculation in the revolving part of the mill through the selfreturning device discharging the qualified material from the mill leading the unqualified material back into the revolving part to participate in the grinding operation The ball mill adopts a discharge screen similar to the ball mill and the function of blocking the internal medium of the overflow ball mill
Get PriceOperation of SAG Mills The motion of charge or rocks and balls in SAG mills can be viewed as a field of breakage generated as a result of the internal profile of the lifters and the rotational speed of the mill shell The ore entering through the feed port is ground by this field and after being sufficiently ground to the grate slot size
Get PriceJan 04 2013 Mill grinding Wikipedia the free encyclopedia It is similar in operation to a SAG mill as described below but does not use steel balls in the millAlso known as ROM or Run Of Mine grinding SAG mill More detailed
Get PriceEvolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1 Ball Mill 14 dia x 21 2240 kW Flotation Underground Storage Bins A B This event resulted in variable speed operation being suspended and the mill being operated at a fixed speed 76 of critical until a thorough analysis of the event
Get PriceFeb 24 2020 Due to the great technical knowledge and safety protocols of Metso Outotec in this type of work Codelco Andina invited the company to participate in the changeout of two of its 7500 and 8500 HP SAG grinding ball mill motors in the interior of its underground operation
Get PriceBall mills and SAG mills The subject of this paper is a synchronous drive of grinding ball mills 4 MW 150 rpm 6 kV 50 Hz on the base of PWM CSI In this regard a simple starting and
Get PriceAug 19 2019 Within comminution circuits High Pressure Grinding Rolls HPGR are increasingly replacing conventional SAG rod and ball mills for hard rock reduction owing to their substantially lower energy consumption and potential for significant total cost of ownership reduction Not only do they require as much as 40 less energy than traditional reduction methods but their wearable
Get Price83 Centrifugal force outward Fc mpamp 2 Dm 2 81 amp is the angular velocity mp is the mass of any particle media or charge in the mill and Dm is the diameter of the mill inside the liners Gravitational force Fg mpg 82 The particle will remain against the wall if these two forces are in balance ie
Get PriceThe SAG mill liners wear will increase by 15 due to the impact of medium such as steel ball during the SAG mill operation Later people were inspired by the semiautomatic grinding mill adjusted the amount of medium in the semiautomatic mill and evolved our most common ore dressing mill ball mill and rod mill
Get Priceyanacocha gold single stage sag mill design operation com implemented which allowed the SAG mill to operate similarly to a large ball mill the Gold Mill with gold recovery from pregnant solutions in the heap leach CIC
Get PriceMar 15 2021 Further either SAG or AG mills can be operated in a standalone mode singlestage or coupled to a ball mill in FAB or SAB configurations Gupta and Yan 2016 The size distribution of the fresh feed as well as the ball size distribution are also known to have important effects in the process NapierMunn et al 1996
Get PriceSag milling in australia focus on the future248 Developments in SAG Mill Design and Operation Over the last few years SAG mill manufacturing technology has advanced rapidlyRetrofits have been favoured as operators moved to more competent ores with open circuiting of the SAG mill and ball mill additions topping the list
Get PriceA SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21 6 7 The largest SAG mill is 42 128m in diameter powered by a 28 MW 38000 HP motor 8 A SAG mill with a 44 134m diameter and a power of 35 MW 47000 HP has been designed 9
Get PriceOct 12 2017 SAG mill make use of steel balls included with some large and hard rocks for grinding These mills utilize the balls in making the large fragments of materials broken into pieces The ball charge of a SAG mill is about 9 to 20This process takes place inside the large rotating drum of SAG mill which is filled with balls partially
Get PriceFeb 08 2017 The operating principle of the ball mill consists of following steps In a continuously operating ball mill feed material fed through the central hole one of the caps into the drum and moves therealong being exposed by grinding media The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls Then discharge of ground material performed
Get PriceMar 21 2007 In the past when primary secondary and tertiary crushers fed material directly to large ball mills the energy efficiency of the concentrator was determined for the most part by the ball mill operation whereas now the energy efficiency of a plant often rests largely on the SAG mill operation
Get Pricemode of operation of sag mill animation mode of operation of sag mill animation PAI SAG Mill TrainingYouTube 08012016 In this training module we ll cover the Gypsum calcining Gypsum calcining ball millings of a semiautogenous grinding mill or SAG mill
Get PriceSingle 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 SAGAG Mills range in size from 43m through 122m in diameter with powers as high as 28000 kW
Get PriceLG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Gross power No load power Net power drawn by the charge 813 The net power is calculated from Net power KD25L e c Watts 814 In equation 814 D is the diameter inside the mill liners and Le is the effective length of the mill including the
Get PriceWhere I work now Minera San Cristobal in Bolivia we use sound control on both the SAG and Ball Mills The result of this control is a 25 increase in throughput over the plant design with a 10 reduction in energy consumption the mill is more efficient
Get Pricestandard practice to install a SAG mill in the SABC SAG ball mill crusher configuration maximum fo r conventional mills The shift to the new mode of operation is terme d RoM ball milling
Get PriceEvolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1 Chief Engineer Guy Comeau2 Senior Metallurgist Colin Hardie3 Former Chief Metallurgist 1 Process Control Group Xstrata Process Support 6 Edison Rd Falconbridge Ontario P0M 1S0 PH 705 693 2761 X 3438 Email ebartschxstrataprocesssupportca
Get Pricethe ball mill this can be caused for example by required inspections performed on the SAG mill shell bearings etc which leads to a relative short shutdown of the SAG mill If the ball mill would be equipped with fixed speed motors then they will have to be washed out isolated and stopped
Get PriceThe driving force for slurry transport from the mill shell through the grate holes is the difference in pressure head across the grate Field of Breakage The motion of charge or rocks and balls in SAG mills can be viewed as a field of breakage generated as a result of the internal profile of the lifters and the rotational speed of the mill shell
Get PriceAGSAG 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 mill Because of the range of mill sizes available AGSAG milling can often be accomplished with fewer lines than in a conventional rod millball mill circuit A diagram of types of AGSAG
Get PriceThe SAGDESIGN test is performed with a specially designed laboratory SAG mill and uses 7 to 9kg depending on ore specific gravity of 38 mm ore The SAG product is then used as feed to a Bond ball mill work index test The results can be used to determine or confirm SAG or AG and ball mill
Get PriceThe SAG mill trommel undersize is combined with the ball mills discharge and pumped to two parallel packs clusters of twelve 660 mm diameter cyclones The cyclone underflow from each line reports to a ball mill while the cyclone overflow is directed to the flotation circuit The designed ball milling circuit product is 80 passing 150 m
Get PriceCortez Gold Mines commenced operation in 1969 with its Mill 1 rated at a nominal 2000 tons per day Mill 1 was a conventional rod millball mill circuit followed by an 8stage CIP circuit In the early 1990s the Pipeline deposit was discovered and subsequently Mill
Get PriceSAG Mill Discharge Controlling the feed and discharge of a mill is mostly a stabilisation exercise you need to be able to quickly and accurately control the mill feed rate If the mill feed setpoint is changed then the actual feed rate needs to stabilise at the new target in a short period of time The feed rate setpoint can then be tied
Get PriceBenchmarking Ball Mill Power Draw Fimiston Nelson M Valery W Morrell S Performance Characteristics and Optimisation of the Fimiston KCGM SAG Mill Circuit Page 233 248 SAG 1996 Conference Vancouver Canada Nordberg model predicts 7 low with no density correction and 08 high with density correction
Get PriceCement Ball Mill Working Fundamentals Application 2020531pilot ball mill Stone Crusher mobile crusher stone Ball Mills cement mill slag mill tube mill FUNdaMENTALS of Design MIT Oct 09 2006 FUNdaMENTAL principles of design discussed in Topic 3 are of particular impo rtance to the proper use of bearings in machines
Get PriceThe SAG mill was installed with a low ball charge no variable speed and a fine grind was targeted P 80 106 m High circulating loads and difficulty achieving the target grind size were experiencedThis type of ore should have been treated in a high ball charge SAG mill with variable speed capability
Get PriceONLINE SAG MILL PULSE MEASUREMENT AND OSTI any kind of monitoring device to measure the conditions inside the mill shell during operation is virtually throughput makeup ball size mill speed liner profile and ball addition rates
Get PriceOct 15 2020 Figure 1 Image of the SAG and ball mills superimposed on the LiDAR survey of the plantVANCOUVER British Columbia Oct 15 2020 GLOBE NEWSWIRE Ascot Resources Ltd TSX AOT OTCQX AOTVF
Get Pricegrinding mill and AGSAG mills MILL MONITOR SYSTEM AND RECENT ENHANCEMENTS The key features of the original prototype of a ruggedized continuous mill monitoring system were described in Campbell et al 2006 A number of changes have subsequently been made to the various components of the mill monitor during evaluation of the prototype system
Get Pricemode of operation of sag and ball mills SAG mill ball mill ring gear dual pinion drive systems variable speed Mountain the inching mode in the ABB drives are currently set to turn the SAG mill at about 10 of An expert system applied to the control of mineral process unit operations is by its ball mill
Get Pricemode of operation of sag and ball mills in cameroon mode of operation of sag and ball mills in cameroon SAG milling extends itself to many applications due to the range of mill sizes available They 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 done by a ball mill SAG mills are also an optimum solution for
Get PriceSep 10 2020 The mill operation modes are as follows The cascade the rolling the grinding balls inside the mill drum Mixed mode the rolling the grinding balls when part of the grinding balls move in a circular trajectory with further fall Waterfall the grinding balls move along a circular trajectory and change it further under gravity
Get PriceJul 08 2020 In 2014 the semiautogenous mill was put into operation with an average operating power of about 156 MW a ball filling rate of about 15 and a ball diameter of 150 mm Due to the high filling rate of steel ball the large diameter of mill and steel ball high impact probability and impact energy of steel ball the liner of semiautogenous
Get PriceSAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult if not impossible Efficiency through automatic operation Metso Outotecs process engineers will assist you in creating an efficient softwaredriven process from circuit design to startup and optimization to ensure you get
Get PriceUsing the SMC Test to Predict Comminution Circuit SMC Testing AGSAG mill and crusher circuit simulations through the use of JKSimMet Coarse in this case is defined as spanning the size range from a P80 of 750 microns up to the P80 of the product of the last stage of crushing or HPGR size microns to the final product P80 normally reached by conventional ball mills fine
Get PriceSAG mill ball mill ring gear dual pinion drive systems variable speed the inching mode in the ABB drives are currently set to turn the SAG mill at about 10 of of a controlled roll back operation on Ball Mill 1 at Copper Mountain is shown in Figure 13
Get PriceIn the process of material grinding the continuous ball mill adopts a continuous and uninterrupted form for feeding grinding and discharging According to different operation process ball grinding mill can be divided into continuous ball mill and batch ball millThe feeding and discharging process of the continuous type ball mill is continuous which can be produced in open or closed
Get PriceSee details of benchmarking Benchmarking Ball Mill Power Draw Santa Rita Latchireddi S amp Faria E Achievement of High Energy Efficiency in Grinding Mills at Santa Rita Proceedings of the Canadian Mineral Processors Annual General Meeting Ottawa Canada January 2013 Faria E amp Latchireddi S Commissioning and Operation of Milling Circuit at Santa Rita Nickel Operation Paper
Get PriceSep 01 1991 The standard line of mills includes autogenous AG and semiautogenous SAG mills beginning with a 6 ft x 2 ft 183 m x 061 m 25 hp 187 kW laboratory mill and is followed by 12 ft to 36 ft 37 m to 11 m diameter mills ranging in power from 150
Get PriceOleg D Neikov in Handbook of NonFerrous Metal Powders 2009 Tumbling Ball Mills Tumbling ball mills or ball mills are most widely used in both wet and dry systems in batch and continuous operations and on a small and large scale Grinding elements in ball mills travel at different velocities Therefore collision force direction and kinetic energy between two or more elements vary
Get PriceBall Mill Operation Ball mills ride on steel tires or supported on both ends by trunnions Girth gears bolted to the shell drive the mill through a pinion shaft from a prime mover drive The prime movers are usually synchronized motors During rotation a portion of the charge is lifted along the inside perimeter
Get PriceShort Cylinder Ball Mill The ball mill with the cylinder length L less than 2 times of the cylinder diameter ie the ball mill with L Operation Of The Ball Mill AMIT 135 Lesson 7 Ball Mills amp Circuits Mining Mill Ball Mill Operation Ball mills ride on steel tires or s
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