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[email protected]Mill grind out In order to measure the ball load in the mill the feed to the mill was stopped and it was ground out to a ball charge only As a result of slurry pooling in the mill the surface of the charge could unfortunately not be inspected and the 97 ball level was measured relative to the slurry 398mm below it
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Considering that worn balls in an industrial mill charge constitute about 15 to 40 percent and that the highest difference in breakage rate observed being nine percent for purely one shape charge it is very doubtful whether it is worthwhile in attempting to develop
Read MoreA common practice is to run SAG mills with high ballcharge levels within low totalcharge levels to maximize ball to rock ratios in the millcharge The outcome is to increase ball participation in the milling process and in crease the frequency of ballcharge interactions and to improve mill throughput
Read Moreinside the mill and it is composed of balls ore and water The ball charge is a function of the bulk fraction of the SAG mill volume Jb occupied by balls the ore retained in the mill is the result of the volumetric ﬁlling which depends on the ore size distribution specially the 600 and the 600 100 on the rotational speed NNc
Read MoreStresses 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
Read MoreThe noise generated by a ball mill during a batch grinding operation is investigated and the results show that for a given ore the noise levels may vary with time of grind ore charge weight and
Read MoreThe effect of mill charge is primarily through the shifting of the center of gravity and the mass of the charge As the charge increases the center of gravity moves inward The power draft is more or less symmetrical about the 50 value A simple equation for calculating net
Read MoreJun 20 2015 · The Motion of the Ball Charge The input energy in ball milling is that applied by the drive to impart motion to the mill charge
Read MoreThe following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency a Mill Geometry and Speed – Bond 1954 observed grinding efficiency to be a function of ball mill diameter and established empirical relationships for recommended media size and mill speed that take this factor into account
Read MoreA 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 A SAG mill with a 44 134m diameter and a power of 35 MW 47000 HP has been designed
Read MoreExploring the Effect of Blast Design on SAG Mill Throughput at KCGM S S Kanchibotla 1 S Morrell 1 W Valery 1 P OLoughlin 2 ABSTRACT Traditionally blasts in mining operations are designed to prepare the insitu rock mass for excavation and subsequent transport without giving much consideration to the downstream comminution processes
Read MoreThe ball size is one of the critical factors for determining the mill performance of ball mills It is well known that larger balls are needed for the effective breakage of largesize particles whereas smaller balls are more effective for the breakage of fine particles
Read MoreAbstract An increase of over 10 in mill throughput was achieved by removing the ball scats from a singlestage SAG mill These scats are nonspherical ball fragments resulting from uneven wear of balls with included porosity 30t of scats were removed from a total charge load of 70t
Read MoreSmartEar technology from Metso Process Technology Innovation is designed to measure a grinding mill’s performance by analyzing its acoustic emissions SmartEar helps to prevent damage to mill liners caused by the impact of the balls and provides an estimate of the ball fill level when used in conjunction with SmartSAG a dynamic model that performs online estimations for the key
Read Moreeach ball on the charge • It can do a 2D simulation in one or two hours That is with 10 000 particles in a SAG mill • It can do 3D simulations in two to three days on a 30 GHz computer 9
Read MoreAbstract An increase of over 10 in mill throughput was achieved by removing the ball scats from a singlestage SAG mill These scats are nonspherical ball fragments resulting from uneven wear of balls with included porosity 30t of scats were removed from a total charge load of 70t
Read MoreDifferent configurations of SAG ball and rod mill occur but in general a SAG mill can be considered an intermediate stage in breaking down rock from the crushing plant and feeding to ball or rod mills for further size reduction
Read MoreSemiautogenous SAG mill performance is influenced by ball charge feed properties shell grate and pulp lifter design In the performance study of SAG mill based on the results obtained it can be observed that SAG mill performed better at feed size 4 inch and grinding media consumption 090kgmt
Read MoreModelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles that the feed particle size has on the mill performance particularly on the power and on the speciﬁc Scw solid concentration by weight fraction in the SAG mill feed Jb balls charge bulk fraction of the SAG
Read MoreThe literature exposed a clear lack of previous research on the influence and performance of gratepulp lifter design in AGSAG mill discharge The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at
Read MoreFor rocks which are in between the css and oss in size a probability exists for them to either remain or pass out of the crusher Semi Autogenous Milling The most recent version of the sag mill model was used and incorporates the effect of ball load feed size and speed Morrell and Morrison 1996 as well as the effects of grate design Morrell and Stephenson 1995
Read Moreiii ABSTRACT Grinding mills used in the mining industries are the most energyintensive operation and also require a large number of wear resistant materials which are utilized for mill liners and
Read MoreChoosing a SAG Mill To Achieve Design Performance John Starkey1 Principal Consulting Engineer Sami Hindstrom2 Manager Grinding Travis Orser2 Project Manager Grinding 1 Starkey Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd E Oakville Ontario L6J 7S4
Read MoreThe makeup balls are 80 mm forged alloy steel balls and the average ball consumption is 750 g t −1 ore ground In order to optimise ball size distribution inside the mill based on the previous investigation instead of using only 80 mm makeup balls a combination of 80 and 60 mm 75 and 25 wt ball charge was used in one of the grinding lines
Read MoreJan 08 2016 · In this training module well cover the workings of a semiautogenous grinding mill or SAG mill thats designed to be the first stage of a grinding circuit Ore that’s crushed in a primary
Read MoreIn ball milling applications the diameter of the balls mill and throw action of the charge provides a lowimpact environment– hence maximum abrasion resistance of steel balls is the desired characteristic CHEMISTRY HARDNESS High carbon content and high hardness levels affect abrasion resistance in
Read MoreBall and ore particles follow Newtons laws of motion 1 A mill speed approaching 80 of critical can optimize grinding action and reduce wear A charge with a increased trajectory does less work and more damage as grinding balls are flung against the opposite side of the shell instead of falling down on top of the central mass 2
Read MoreModel Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure
Read Moredata that has been shown to provide new information about the mill charge in terms of toe and shoulder position as well as potentially key features such as the overall charge level the distribution between rock and balls in the mill and the impact of the charge on the mill liners and lifters
Read MoreThe −20 10 mm fraction pebbles are compared with steel balls as media for grinding of a copper concentrate in a vertical stirred mill which obtained from a 70 m diameter × 35 m SAG mill at Jiangxi Copper Corporation China
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