sag mill ball charge calculation
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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
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Improved Relationships for Discharge in SAG/AG Mills
there has been a shift of emphasis on ball mill optimization to semi autogenous grinding SAG mills In order to optimize this section the skills to accurately model and understand its underlying mechanisms are required The literature exposed a clear lack of previous research on the influence and performance
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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
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calculates the grinding charge of a ball mill Mining
Mar 08 2013 To calculate grinding media charge for continuous type ball mill M = 0.000676 x D2 x L Example .
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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.
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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
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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.
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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
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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
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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
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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
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Application of Operating Work Indices in Autogenous
AG/SAG mill product that needs additional grinding in the ball mill or Corrected Ball Mill Feed T2 is the 80 passing dimension of the Corrected Ball Mill Feed Figure 1 Comparison of the Particle Size Distribution Slopes Figure 2 Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3.
Get PriceSAG 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
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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
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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.
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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
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AMIT 135 Lesson 7 Ball Mills CircuitsMining Mill
For overflow ball mills the charge should not exceed 45 of the mill volume For grate discharge mills the charge should occupy about 50 of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge He and the radius of the mill R i.e
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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
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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
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SAGDesign Test Starkey and Associates Inc.
The SAG mill pinion energy W SDT kWh/t and SAG discharge Bond ball mill work index S d BWI kWh/t are then used to calculate the total energy to grind the ore from 80 passing 152 mm to 80 passing the client specified final product size P 80.This information along with the ore specific gravity is used to calculate necessary mill sizes and motor power in industrial applications.
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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
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Mill grinding Wikipedia
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 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
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Bond formula for the grinding balls size calculation
Oct 19 2017 There is a mathematical solution to this problemthe Bond formula It uses to help determine the grinding media optimal size must be loaded into the ball mill for proper operation ensure The calculation formula is below Bthe grinding balls diameter mm Athe correction factor for grinding balls A = 20 17 for cilpence A = 18 15
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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
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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.
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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.
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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
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Model Bond/Barratt SABC ModelsSAGMILLING
Ball limited circuits where the T 80 hits the lower limit will result in the charge level in the SAG mill dropping until its power draw matches the throughput limit dictated by the ball mill It is important to realize that once the SAG mill charge level drops to be equal to the ball charge the model will be operating out of range and the
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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
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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
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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
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Optimization of mill performance by using
Stresses generated in the ball charge increase which may result in spalling of balls and blocking the grate discharge Optimization of mill performance by using online ball and pulp measurements by B Clermont and B de Haas Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator.
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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
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