power based sag mill design calculations

  • MODELING THE SPECIFIC GRINDING ENERGY AND BALL

    21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm) the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h) zthe ball-mill dimensions (D and L) when Optimization of mill performance by using online ball and pulp measurements Soon after a stop a mill is a dangerous place to enter for the personnel tasked with taking measurements or samples. Crash stops are difficult to handle. The mill and all feed streams should be stopped simultaneously but often they are stopped around about the same time.

  • Optimization of mill performance by using

    Optimization of mill performance by using online ball and pulp measurements Soon after a stop a mill is a dangerous place to enter for the personnel tasked with taking measurements or samples. Crash stops are difficult to handle. The mill and all feed streams should be stopped simultaneously but often they are stopped around about the same time. 21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm) the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h) zthe ball-mill dimensions (D and L) when

  • Application of Operating Work Indices in Autogenous

    classify the AG/SAG mill product into two products the phantom cyclone overflow that is similar to the final ball mill product and the phantom cyclone underflow is then used as an adjusted ball mill feed for the ball mill power calculation. This technique is specifically suitable for model-based calculations as it requires efficiency curve). classify the AG/SAG mill product into two products the phantom cyclone overflow that is similar to the final ball mill product and the phantom cyclone underflow is then used as an adjusted ball mill feed for the ball mill power calculation. This technique is specifically suitable for model-based calculations as it requires efficiency curve).

  • Design SAG mill production when you need it most In day 1

    pressure on mill sizing has resulted in non-flexibility in new SAG mill circuit designs. In order to defend the mill size selected the owner s engineers need to be able to quantify the loss in productivity that will occur if the SAG mill is downsized. Power based methods allow this calculation to be executed rapidly with good accuracy. studies a SAG mill sampler was designed and constructed and sampling sites were also prepared. In addition a laboratory mill was designed and 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

  • Power Based Sag Mill Design Calculations

    Power Based Sag Mill Design Calculations. Contact Form. List of Current Users Power Flow Software . Customize ETAP to fit your needs from small to large power. Get Price. NCP Brochure R Osborn. Design Mill charge characteristics. generate a final Grind size in closed circuit through a single Mill. SAG Mills 4. Dobby Starkey method using a timed laboratory SGI Mill for SAG milling. Peter A. Day 2 08 30-10 30 Non-standard particle size distributions the phantom cyclone and ball mill CF factors geometallurgy and sampling an orebody. Alex D. 10 30-11 00 Coffee break AM 11 00-12 30 Mill power draw models for ball mills and SAG mills. Alex D.

  • ABB ring geared mill drivesYouTube

    Jun 05 2013 · We provide optimized mill drive solutions for all types of ring-geared mills low and high speed single and dual pinion with and without a gearbox — all designed for reliable long life and pressure on mill sizing has resulted in non-flexibility in new SAG mill circuit designs. In order to defend the mill size selected the owner s engineers need to be able to quantify the loss in productivity that will occur if the SAG mill is downsized. Power based methods allow this calculation to be executed rapidly with good accuracy.

  • What s the Difference Between SAG Mill and Ball Mill

    Based on the high throughput and coarse grind AG mills produce coarse grinds often classify mill discharge with screens and trommel. SAG mills grinding media includes some large and hard rocks filled rate of 9 20 . SAG mill grind ores through impact attrition abrasion forces. Dec 07 2018 · Sag in overhead Transmission line conductor refers to the difference in level between the point of support and the lowest point on the conductor. As shown in the figure above a Transmission line is supported at two points A and B of two different Transmission Towers. It is assumed that points A and B are at the same level from the ground.

  • Energy and Cost Comparisons of HPGR-based Circuits E MJ

    The collected SAG feed sample was prepared for pilot-scale HPGR and stirred mill testing to determine the key operating parameters for flowsheet design and power-based calculations. Ultimately the simulation and test results allowed for the direct comparison of the energy and costs for three circuits.

  • sag mill ball charge calculation

    Paper # 25Copper Mountain Overview on the sag mill ball charge calculation. sag mill ball charge calculation. SAG Mills Mining Technology TechnoMine. the mill power and the efficiency of the mill operation (Van Nierop and Moys 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power consumption but will not satisfy

  • Orway Mineral Consultants Canada Ltd. Mississauga ON

    with lower metal grades. 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. Based on the high throughput and coarse grind AG mills produce coarse grinds often classify mill discharge with screens and trommel. SAG mills grinding media includes some large and hard rocks filled rate of 9 20 . SAG mill grind ores through impact attrition abrasion forces.

  • AGAutogenous 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. In the pilot plant tests the tare power of the pilot plant mills article osti_922135 title = Improving Energy Efficiency Via Optimized Charge Motion and Slurry Flow in Plant Scale Sag Mills author = Rajamani Raj K abstractNote = A research team from the University of Utah is working to make inroads into saving energy in these SAG mills. In 2003 Industries of the Future Program of the Department of Energy tasked the

  • Improving Energy Efficiency Via Optimized Charge Motion

    article osti_922135 title = Improving Energy Efficiency Via Optimized Charge Motion and Slurry Flow in Plant Scale Sag Mills author = Rajamani Raj K abstractNote = A research team from the University of Utah is working to make inroads into saving energy in these SAG mills. In 2003 Industries of the Future Program of the Department of Energy tasked the University of Utah team to The current practice of exploratory design of ore pre-treatment process increasingly uses laboratory testing of ore CALCULATION OF THE REQUIRED SEMIAUTOGENOUS MILL POWER BASED ON THE BOND WORK INDEXES O. I. SKARIN Senior Researcher the existing techniques of sizing SAG mill power Bond work in-dexes and their applicability to

  • Step-by-Step Sag and Tension Computation using Ruling Span

    Jul 29 2018 · Clearances must be based on the final computed sag of the power line. Take note that if we will not use the ruling span theory the final sag would be different. For instance if we apply directly the conductor state change equation to the 500 meters span (S =500) the final tension would be H 2 = 16 265 Newtons with a sag of 23.35 meters. This paper examines the design of comminution circuits and the issues that impact on comminution circuit efficiency. Circuit efficiency is discussed principally from the perspective of power efficiency. However operating efficiency maintenance efficiency capital expenditure and a SAG mill based circuit (P80 of 106 to 150 um) has media

  • What is Sag Tension in transmission lines Formula

    Sag and Tension Sag is an interesting topic to discuss.We generally see a lot of overhead lines on our way.Sag in general words can be said that distance between the highest point of electric poles or towers and the lowest point of a conductor connected between two poles or towers.You will know how to calculate sag and sag formula. Mill liner wear and life prediction for any liner/lifter design SAG mill slurry pooling model to predict the onset and effect of slurry pooling for varying operating conditions Grinding mill trajectory model to determine safe operating speed ranges based on liner/lifter design

  • Cooling tower basics calculation formulas Cooling Tower

    Cooling tower basics calculation formulas Cooling Tower Efficiency In this article explained about basic concepts of cooling tower types of cooling towers formula for cooling tower efficiency. Also brief about Cooling tower mass balance of make-up water requirement in system Drift Losses or Windage Evaporation losses Blowdown or Draw off. Examples are lifter height and face angle design for mill liners chute design and SAG mill discharge system design. SAGMILLING implements only Power Models. Other specialized software is needed for population balance or DEM modelling. Power Models. Power models work by estimating the specific energy required to grind an ore (the specific

  • Improved Relationships for Discharge in SAG/AG Mills

    of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in 21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm) the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h) zthe ball-mill dimensions (D and L) when

  • (PDF) Power-based comminution calculations using Ausgrind

    Some design methods (Lane et al. 2013 Morrell 2004 Siddall Putland 2007 predict the total comminution energy requirements of SAG mill-based circuits using work indices measured in The SAG mill pinion energy is determined from the SAGDesign™ testwork results as follows W SDT = revs (16 000 m s)) / (447.3 m s) where W SDT = 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

  • AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill

    Mill Type Overview. Three types of mill design are common. The Overflow Discharge mill is best suited for fine grinding to 75106 microns. The Diaphram or Grate Discharge mill keeps coarse particles within the mill for additional grinding and typically used for grinds to 150250 microns. The Center-Periphery Discharge mill has feed reporting from both ends and the product discharges Power Transformer Design This Section covers the design of power trans-formers used in buck-derived topologies forward converter bridge half-bridge and full-wave center-tap. Flyback transformers (actually coupled induc-tors) are covered in a later Section. For more spe- cialized applications the principles discussed herein

  • SINGLE STAGE SAG/AG MILLING DESIGN

    The SAG mill model in the JKSimMet software has not been shown to accurately reproduce the performance of a single stage mill for greenfield design. A review of most modern power models shows that the prediction of specific energy is influenced by the high energy breakage characteristics of the ore (DWi t 10 SPI etc.) and the low energy (BWi). 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

  • Sag and-tension claculationLinkedIn SlideShare

    Feb 06 2013 · Figure 14.5 shows the tension versus slack curves intersecting at a tensionof 3700 lb which agrees with the preceding calculations.14.2.3 Sag Change Due to Ice LoadingAs a final example of sag-tension calculation calculate the sag and tension for the 600-ft Drake spanwith the addition of 0.5 inches of radial ice and a drop in conductor Sag-tension Calculations A Tutorial Developed for the IEEE TP C Line Design Subcommittee Based on a CIGRE WG B2.12 Technical Brochure under Development Dale Douglass June 2005. June 6/13/05 IEEE TP C Tutorial CIGRE IEEE Websites • CIGRE WG B2.12Electrical Effects in Lines

  • Ball Mill Design/Power Calculation

    The basic parameters used in ball mill design (power calculations) rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and finally the type of circuit distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill