sag and ag mill power calculation

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sag and ag mill power calculation

2020-05-05T10:05:49+00:00
  • Starkey Associates Inc. - Leaders in Comminution Design

    = AG/SAG Specific Pinion Energy from a F 80 of 152.4 mm to a T 80 of 1.7 mm, kWh/ton ground revs = Cumulative number of SAG test mill revolutions to 80% passing 1.7mm m s = SAG mill feed sample mass, grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution : S d-BWI = 1.102 * 44.5 / (P cs 0.23 G pb 0.82 ...

  • AG - Autogenous SAG Semi-Autogenous Mill Design

    Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size. In the pilot plant tests, the tare power of the pilot plant mills should be determined ...

  • AG/SAG/Ball Mill - metengineer

    AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator. Shell Sizing Parameters. Parameters. Value . Value . Mill Shell Inside Diameter: [m] [ft] Mill Shell Inside Length: [m] [ft] Shell Heads Cone Angle: [degrees] Effective Grinding Diameter: [m] Effective Gringing Length (EGL ...

  • SAG Mill Grinding Circuit Design

    Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating StrategiesThe design of large mills has become increasingly more complicated as the size has increased and there is little doubt that without sophisticated design procedures such as the use of the Finite Element method the required factors of safety would make large mills prohibitively expensive. In the past the design of small mills, up to +/- 2,5 metres diameter, was carried out using empirical formulae with relatively large factors of safety. As the diameter and length of mills increased several critical problem areas were ident
  • Modelling: Transfer size limits - SAGMILLING.COM

    For example, the SAG mill may have 10 MW of power draw available and the two ball mills each of 7.5 MW of power draw available for a total of ratio of 10:15 (1:1.5). The software uses the particular power model (Bond/Barratt, Morrell Mi, etc.) to determine what is the transfer size where the ratio of E SAG to E ball matches the ratio of mill power (1:1.5 in this example).

  • A Method of C alculating Autogenous/ Semi-Autogenous ...

    The DBC method of generating AG/SAG SEs is by calculating the SE according to Bond’s Third Theory equation (Bond, 1961), then adding a factor to increase the power to equal high aspect (HA) AG/SAG mill energy requirements. This calculation is

  • Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

    Simulation software and power-based equation methodologies have been established for designing AG/SAG based grinding circuits and predicting their energy requirements. Presently, power-based equations remain the principal method for designers to size mills and estimate the power requirement for comminution circuits.

  • File Size: 1MB
  • SAGMILLING.COM .:. Home

    Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers. The online library of technical articles contain several papers on metallurgical topics ...

  • TECHNICAL NOTES 8 GRINDING R. P. King

    Figure 8.3 Simplified calculation of the torque required to turn a mill. RI FULWLFDO VSHHG 3RZHU Figure 8.4 The effect of mill speed on the power drawn by a rotating mill. The liner profile and the stickiness of the pulp in the mill can have a significant effect on the actual critical velocity. Mills usually operate in the range 65 - 82% of critical but values as high as 90% are sometimes used ...

  • File Size: 943KB
  • SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

    SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind sizes. High aspect mills are recommended to ...

  • File Size: 64KB
  • AG/SAG/Ball Mill - metengineer

    AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills. Exit Mill Calculator. Shell Sizing Parameters. Parameters. Value . Value . Mill Shell Inside Diameter: [m] [ft] Mill Shell Inside Length: [m] [ft] Shell Heads Cone Angle: [degrees] Effective Grinding Diameter: [m] Effective Gringing Length (EGL ...

  • Sag Mill Ball Charge Calculation

    Ball Mill Grinding Average Calculation. Single stage sag/ag milling design.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 africa) yanacocha 5 low ball charge high speed sag mill (4% ball charge 90% nc) a cross between ag and sag for average competency abrasive ores typically operated in rsa on witwatersrand gold ...

  • Modelling SAG milling power and specific energy ...

    2015-01-01  SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) at different % of the fresh feed in the size range −6″ +1″ ... S. Morrell, W. ValeryInfluence of feed size on AG/SAG mill performance. SAG 2001, Vancouver, Canada (2001), pp. I203-I214. Google Scholar. Morrell, 2004 . S. MorrellPredicting the specific energy of autogenous and semi-autogenous mills from small ...

  • Application of Operating Work Indices in Autogenous ...

    Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit efficiency, with great utility. Operating work indices can be used to evaluate individual units in a ...

  • Multi-component AG/SAG mill model - ScienceDirect

    2013-04-01  The grinding media of autogenous mills derive from the feed ore size and composition (Delboni and Morrell, 1996) and the varying ratio of different components in the mill feed affects the mill charge and consequently the whole breakage process. after developing a new AG/SAG mill model that describes the influence of mill charge composition on breakage performance, Delboni (1999)

  • 20150821 Morrell Method-GMG-ICE-v01-r01 Morrell method

    bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leach-ing). 2. Feed rate to the circuit (dry tonnes/h) 3. Power draw of the comminution equipment (kW) •In the case of mills, the power draw should be repre-sented in terms of power ...

  • grinding mill power calculation - Popular Education

    There are three power-based methodologies for sizing SAG mills that are ..... grinding calculations which operate in “power at the pinion”3. Read More. 1 MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL ... the calculation of the specific grinding energy w and. the determination of the mill power draw P. (as a function of the Bond work index w i. ) Use of the above... Read More. Ball ...

  • Choosing a SAG Mill to Achieve Design Performance

    A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2. Figure 2: Pilot Plant kg/hr Vs Charge % by Volume This data is ...

  • SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

    SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind sizes. High aspect mills are recommended to ...

  • AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

    AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill red=fastest, blue=slowest moving particles [image: (135-6-4)] The mill product can either be finished size ready for processing, or an intermediate size ready for final ...

  • grinding mill power calculation - Popular Education

    There are three power-based methodologies for sizing SAG mills that are ..... grinding calculations which operate in “power at the pinion”3. Read More. 1 MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL ... the calculation of the specific grinding energy w and. the determination of the mill power draw P. (as a function of the Bond work index w i. ) Use of the above... Read More. Ball ...

  • USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT

    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 ball work index test, enable the prediction of the specific energy of comminution circuits where such circuits include combinations of any of the following equipment: AG and SAG mills Ball mills Rod mills Crushers High ...

  • SAG mill optimisation using power-based simulations Ausenco

    SAG mill optimisation using power-based simulations. Author Dr. Rajiv Chandramohan, Robert Braun, Greg Lane. Paper presented by Dr. Rajiv Chandramohan at Comminution '18, Cape Town, South Africa, April 2018. ABSTRACT. Ausenco’s Ausgrind comminution program has been the in-house design tool used on a number of successful projects and technical studies. In recent years, Ausgrind has been

  • sag mill energy calculation xls - ciaacademy.co.za

    A comparison of SAG mill power models - Sizing the mills for a new grinding circuit requires a determination of how much energy is ... EXAMPLE CALCULATION A mill survey was ... SAG Mill Throughput at ... A Method of C alculating Autogenous/ Semi (HA) AG/SAG mill energy requirements. This calculation is based on a SG of 2.78 t/m3 and an Ab value of 40. ... SE calculation and AG/SAG mill

  • Calculate Cost Of Sag Mill

    AG Autogenous SAG Semi-Autogenous Mill Design Calculations. Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size.

  • Grinding mills - for mining and minerals processing - Metso

    Every mining operation has a unique grinding process. Metso has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

  • Mill (grinding) - Wikipedia

    SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their ...

  • Difference Between Sag Mill vs Ball Mill - mech4study

    2017-10-12  In ancient time, the mills were operated with muscle power (by hands), water animals and wind. They were totally based on the mechanical energy by natural resources and living beings.There are many types of mills which are used in the grinding industries. Today we will discuss about two important mill, sag mill and ball mill. Sag Mill vs Ball Mill: Semi-Autogenous Grinding Mill – SAG Mill ...

  • Calculation of Sag Tension in Transmission Line - for ...

    For calculation, it is assumed that the AOB is the parabola. But, The value of x obtained above may be substituted in equation (5) to calculate sag at OA . Equation (8) shows that the lowest point lies outside the span AB. Hence, the conductor in the span under consideration exert an upward force, and the conductor tends to swing clear of the ...

  • OUTOTEC GRINDING TECHNOLOGIES

    single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. Ball mills Ball milling is the most common application for horizontal tumbling mills. Outotec offers a full range of ball mills to suit a wide variety of duties, from a few hundred kW all the way up to 20 MW and beyond. Rod mills

  • sag mill energy calculation xls - ciaacademy.co.za

    A comparison of SAG mill power models - Sizing the mills for a new grinding circuit requires a determination of how much energy is ... EXAMPLE CALCULATION A mill survey was ... SAG Mill Throughput at ... A Method of C alculating Autogenous/ Semi (HA) AG/SAG mill energy requirements. This calculation is based on a SG of 2.78 t/m3 and an Ab value of 40. ... SE calculation and AG/SAG mill

  • Grinding mills - for mining and minerals processing - Metso

    Every mining operation has a unique grinding process. Metso has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

  • Improved mill control at Lihir Gold Mine in Papua New ...

    The grind curve work of Powell and Mainza (2006) and Powell et al (2009) demonstrated that the optimal volumetric mill filling for maximum federate does not necessarily align with maximum power draw, especially for high aspect SAG mills. It follows that SAG mill process control systems that target maximum SAG motor power will not necessarily result in the maximum milling rate. Instead, SAG ...

  • Calculate Cost Of Sag Mill

    AG Autogenous SAG Semi-Autogenous Mill Design Calculations. Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact grinding circuit and mill size.

  • Autogenous and Semi-Autogenous Mills

    Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill designs in order to provide the most robust, safe, and efficient grinding mills available. Key design features: Robust head castings and shell fabrications resulting in low stress levels and longer operating life; Mill ...

  • JME

    constructed in order to determine the SAG mill power index (SPI), and a formula for the SAG mill consumed power prediction was introduced [2]. The formula is as Equation 1[2]: where, P is specific consumed power of the SAG mill (kWh/t), SPI is SAG mill Power Index (min.), K80 is the size of final product of the SAG mill

  • Modelling SAG milling power and specific energy ...

    the SAG mills throughput, power consumption and accordingly, specific energy. The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance. Some oper-ations have recognised an opportunity in the relationship between feed size and mill performance and manipulate feed size to obtain ...

  • The Evolution of Grinding Mill Power Models SpringerLink

    2019-01-30  Sepúlveda JE (2017) “The Hogg Fuerstenau power model for AG/SAG Mills: recalibration with an expanded database,” PROCEMIN Geomet Conference 2017, Santiago, Chile Google Scholar. 6. Herbst JA, Fuerstenau DW (1973) Mathematical simulation of dry ball milling using specific power information. Trans SME 254:343–348 Google Scholar. 7. Herbst JA, Fuerstenau DW (1973) Influence of mill

  • Sag in Overhead Conductor Electrical4U

    2018-04-17  So, having calculated the value of x 1 and x 2, we can easily find out the value of sag S 1 and sag S 2. The above formula are used to calculate sag when the conductor is in still air and ambient temperature is normal. Hence the weight of the conductor is its own weight. What is the Effect of Ice and Wind on Sag?

  • OUTOTEC GRINDING TECHNOLOGIES

    single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. Ball mills Ball milling is the most common application for horizontal tumbling mills. Outotec offers a full range of ball mills to suit a wide variety of duties, from a few hundred kW all the way up to 20 MW and beyond. Rod mills