sag mill ball charge calculation

  • Inferential measurement of sag mill parameters IV

    Oct 01 2009  4.1.1. SAG Mill Charge EstimatesThe first set of results is for 8 October 1997 The Grinding Log Sheet recorded that ball charging only occurred during day shift 08 00–16 00 h .Fig 2 Fig 3 illustrate the inferential model of the ball charge fraction J b capturing the ball charging that occurs during the day shift.The model estimates of the ball charge fraction firstly rising from 0.10

    Chat Online
  • AG/SAG/Ball Millmetengineer

    AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding AG Semi Autogenous Grinding SAG and Ball Mills SAG and Ball Mills Exit Mill Calculator Shell Sizing Parameters Parameters Value Value Mill Shell Inside Diameter m ft Mill Shell Inside Length Ball Charge Density t/m 3

    Chat Online
  • Optimization of the make up ball charge in a grinding mill

    make up ball diameter of about 1.7 inches that is a mixture weighted toward 1.5 inches 3 An increase of 12 in capacity was predicted with the optimum make up ball charge with respect to a

    Chat Online
  • SAGMILLING tools millfilling

    Mill Volume Filling Calculation Enter the number of lifters that are exposed above the mill charge Fractions are acceptable and should be used in the case where the charge does not sit uniformly in the mill For example you may have 29 rows exposed at the discharge end of the mill and only 28 exposed at the feed end

    Chat Online
  • USING THE SMC TEST TO PREDICT COMMINUTION

    Tumbling mills eg AG SAG rod and ball mills Conventional reciprocating crushers eg jaw gyratory and cone HPGRs Tumbling mills are described using 2 indices M ia and M ib Crushers have one index M ic HPGRs have one index M ih For tumbling mills the 2 indices relate to coarse and fine ore properties plus an

    Chat Online
  • AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

    The mill product can either be finished size ready for processing or an intermediate size ready for final grinding in a rod mill ball mill or pebble mill AG/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 mill.

    Chat Online
  • SAG Mill Ball SizingGrinding Classification Circuits

    With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 up to 2.5 for a coarse mill feed say F80 > 110 mm If the mill feed size is fine say 50 mm or 30 mm then you are looking at a total charge to ball charge ratio of about 1.5 1.6.

    Chat Online
  • Magnetic Separation Techniques to Improve Grinding

    As part of this article there are two Ball Mill Calculations comparing conventional ball mill power consumption Hogg Fuerstenau Model before tramp steel removal Figure 14 and after tramp steel removal Figure 15 These calculations indicate the ball charge is reduced from 678 tons to 585 tons target ball loading .

    Chat Online
  • Ball charges calculatorsthecementgrindingoffice

    Ball top size bond formula calculation of the top size grinding media balls or cylpebs Modification of the Ball Charge This calculator analyses the granulometry of the material inside the mill and proposes a modification of the ball charge in order to improve the mill efficiency

    Chat Online
  • On the comparison between measured and calculated stresses

    The cause of the discrepancy in agreement between measurement and calculation for the two mills is determined to be the relative percentage of ball charge to total charge For lower total charge to ball charge ratios the pressure on the heads or end walls of the mills reduces dramatically As this ratio increases the pressure on the heads

    Chat Online
  • PDF A comparison of wear rates of ball mill grinding media

    The Ball Mill Abrasion BMA test was developed by the University of Queensland Materials Performance group to simulate the high stress abrasion conditions experienced in production ball mills.

    Chat Online
  • FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

    respect with SAG mills being increasingly less sensitive as the ball charge is increased Morrel S and Valery W 2001 2.2 EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative effect of changes in particle size distributions PSD on the SAG mill performance can be addressed by using the grind curves.

    Chat Online
  • Orway Mineral Consultants Canada Ltd Mississauga ON

    2006 The laboratory bench scale SAG mill reproduces operating conditions of a commercial SAG mill in a closed circuit dry grinding environment The ground product for the laboratory SAG mill is then submitted to the Bond ball mill work index test The number of SAG mill

    Chat Online
  • SAGMILLING Mill Critical Speed Determination

    The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell s inside surface This is the rotational speed where balls will not fall away from the mill s shell Result #1 This mill would need to spin at RPM to be at 100 critical speed Result #2 This mill s

    Chat Online
  • SAG mill ball charge determination and its influence on

    May 24 1990  Abstract In semi autogenous grinding SAG the grinding mill inventory i.e volume of total charge volume of ball charge etc is important in determining the optimum operating condition for maximum production tph minimum specific energy kwh/t or lowest cost /t A two dimensional graphical method is presented for determining the actual ball charge within the total charge when

    Chat Online
  • A Method of C alculating Autogenous Semi Autogenous

    SAG 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.

    Chat Online
  • INFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS IV

    semiautogenous grinding SAG mills and is the fourth paper in a series of five papers on Inferential Measurement of SAG Mill Parameters The development of the inferential measurement models of SAG mill discharge and feed streams and mill rock and ball charge

    Chat Online
  • Difference Between Sag Mill vs Ball Millmech4study

    Oct 12 2017  The ball charge of a SAG mill is about 29 to 30 By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness The internal machinery of ball mill grinds the raw material into the powder like material And if extreme fineness and refinery are required then rotation go on continue.

    Chat Online
  • Modelling SAG milling power and specific energy

    size ball load mill speed and solids will represent the total load Ball Mill SAG Mill Scw Jb Pc 6 1 N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig 1 SABC A/B milling circuit Scw = solid concentration by weight fraction in the SAG mill feed Jb = balls charge bulk fraction of the SAG mill volume N/Nc

    Chat Online
  • PDF OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS

    circuit The Kinross Paracatu new grinding circ uit consists of one 11.6 x 6.7m 38 x 22 SAG mill with installed po wer of 20MW followed by two 7.3 x 12.2m 24 x 40 ball mills with

    Chat Online
  • On the comparison between measured and calculated stresses

    Nov 01 2011  The hypothesis that the head or end wall pressure in a SAG mill reduces as the ratio of total charge to ball charge reduces seems plausible The results from this study indicate that the pressure on the heads reduces to zero when the total charge to ball charge ratio equals 2.0 as in Cadia mill and that the head pressure equals the hydrostatic

    Chat Online
  • SAGMILLING tools

    Determines the effective mill inside diameter of a given set of top hat lifters for use in mill volume and critical speed calculations Mill Filling Calculation Estimates the charge volume of a grinding mill based on the number of exposed lifters By counting the number of lifters showing during a mill shutdown and comparing to the total

    Chat Online
  • AGAutogenous SAG Semi Autogenous Mill Design Calculations

    Apr 17 2018  Figure 3a and 3b gives the results of the computer calculation The mill power at the pinionshaft for a 30 volume charge is the sum of Figures 3a 3b give the power for an autogenous mill Figures 4a and 4b are for the same size mill with a ball charge of 6 of mill

    Chat Online
  • Autogenous and Semi Autogenous Mills FL

    Single 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 Fuller Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28 000 kW.

    Chat Online
  • A Method to Determine the Ball Filling in Miduk Copper

    one SAG mill 9.75 dia m 3.88 length m following two parallel ball mills 5dia m 7lenght m The aim of this research work was to investigate on the ball filling estimation of Miduk semi autogenous SAG Mill via an utilized method Miduk SAG Mill circuit is shown in Figure 1 Figure 1 Diagram of Miduk Copper Complex

    Chat Online
  • Purchase of New SAG Mill from First Majestic Silver Corp

    Mar 15 2021  The SAG Mill has a mill diameter of 24 feet and an Effective Grinding Length EGL of 18.5 feet and a structural charge mass of 315 metric tonnes The structural design ball charge is

    Chat Online
  • How to calculate ball/sag mill charge level Grinding

    To participate in the 911Metallurgist Forums be sure to JOIN LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding OR Select a Topic that Interests you Use Add Reply = to Reply/Participate in a Topic/Discussion most frequent Using Add Reply allows you to Attach Images or PDF files and provide a more complete input Use Add Comment = to comment on someone else s

    Chat Online
  • TECHNICAL NOTES 8 GRINDING R P King

    steel balls in a ball mill or large lumps of ore in an autogenous mill or a mixture in a semi autogenous mill as well as the slurry that makes up the operating charge Let Jt be the fraction of the mill volume that is occupied by the total charge Jb the fraction of the mill volume that is occupied by steel balls and E the voidage of the balls

    Chat Online
  • Advanced Controller for Grinding Mills Results from a

    ore per day in six overflow ball mills The concentrate is transported to a smelter a few miles away The crushed ore from primary and secondary ores is conveyed into bins The ore from the bins is fed into the ball mill using a conveyor belt The ball mill grinding circuit is illustrated in Figure 2 Solids 78.9 Circulating Load 474 Advance

    Chat Online
  • Mill Chargean overview ScienceDirect Topics

    According to available literature the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85 of the critical speed SAG mills of comparable size but containing say 10 ball charge in addition to the rocks normally operate between 70

    Chat Online
  • Optimizing Performance of SABC Comminution Circuit of the

    Dec 02 2016  optimization of the SABC comminution circuit focusing on the primary SAG mill and secondary ball mill grinding mills and estimating the outcomes of changes to circuit operating parameters e.g feed rate mill load ball charge etc 2 Problem Validation and Analysis

    Chat Online
  • O I SKARIN N O TIKHONOV CALCULATION OF THE

    to the detailed accounting of ball charge motion The Introduction gives a description of the proposed approxi mation of ball charge position in a rotating drum and its depen dence on the mill velocity In what follows the mathematical ap paratus used for the forecasting calculation of capacities of the drum shell and cone is presented.

    Chat Online
  • Mill Steel Charge Volume Calculation

    Jun 19 2015  We can calculate the steel charge volume of a ball or rod mill and express it as the of the volume within the liners that is filled with grinding media While the mill is stopped the charge volume can be gotten by measuring the diameter inside the liners and the distance from the top of the charge to the top of the mill.

    Chat Online
  • Grinding Mill Computer Model

    This reverts to the Morgärdshammar method and is similar to the AM calculation 3.6 Tower Mill The tower mill calculation is based on the ball mill design sheet but is simplified in that the mill design section is omitted A simple tower mill factor of 70 allows the mill power to be estimated MILLCALCv2a 5 19/02/2004

    Chat Online
  • Ball Mill Critical Speed Working PrincipleYouTube

    https //911metallurgist/blog/ball mill Learn about Ball Mill Critical Speed and its effect on inner charge movements The effect of Ball Mill RPM s

    Chat Online
  • Applications GSI LucchiniJSW Steel Italy

    Optimal Ball Size and Balanced Ball Charge calculation Grinding ball performance simulations Basic design parameters for new or expansion projects POST SALES Regular on site technical customer support Control of ball performance Design and assistance to execution of Marked Ball Wear Test MBWT and Industrial Test in order to precisely

    Chat Online
  • C O N S U L T I N G L T D TECHNICAL MEMORANDUM

    EF5BM= P80 10.3 1.145 P80 3 The EF4 formula requires both the rod mill and ball mill work index rod mill Wi is used to calculate the optimal feed size and because this is a single stage ball mill calculation the F80 is actually the rod mill feed size 10 000 µm from Table 1 and the P80 is the ball mill circuit product The EF5 factor only applies below 75 µm to ball

    Chat Online
  • SAG Mill Grinding Circuit Design911metallurgist

    Jun 06 2016  This refers to high aspect AG/SAG mills Ball Charge Motion inside a SAG Mill With a higher density mill charge SAG mills have a higher installed power density for a given plant footprint relative to AC mills With the combination of finer grind and a lower installed power density based on the lower density of the mill charge a typical AG

    Chat Online
  • SINGLE STAGE SAG/AG MILLING DESIGN

    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 815 ball charge Competent ores better suited to coarse grind sizes High aspect mills are recommended to

    Chat Online
  • Sag Mill Ball Chargebtlforms

    How To Calculate Sag Mill Ball Charge Sag Mill Optimum Charge Size With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 up to 25 for a coarse mill feed say F80 110 mm If the mill feed size is fine say 50 mm or 30 mm then you are looking at a total charge to ball charge ratio of about 15 16 More Details

    Chat Online
  • SAGMILLING tools

    Determines the effective mill inside diameter of a given set of top hat lifters for use in mill volume and critical speed calculations Mill Filling Calculation Estimates the charge volume of a grinding mill based on the number of exposed lifters By counting the number of lifters showing during a mill shutdown and comparing to the total

    Chat Online

Solutions

Products

Project

News