SAG and ball mills have grown in size and there are now ... Effect of mill speed and lifter profile on load trajectors Figure 2. Schematic view of ball trajectories. ... The varying nature of mill charges is such that there can be many combinations of balls, mineral and water having the same weight but
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Jun 30, 2007 A laboratory tower mill was used to investigate the effect of some variables on the power requirements of a plant mill. The grinding laws were tested for fine grinding and Charles` law and Rittinger`s law was found to most closely satisfy the experimental data. The effects of ball size, ball charge mass and media type were investigated.
Get best priceBall and ore particles follow Newton's 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.
Get best pricerespect 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.
Get best price2015-7-1respect with sag mills being increasingly less sensitive as the ball charge is increased morrel s and valery w, 2001 effect of feed size distribution on sag milling the qualitative eect of changes in particle size distributions psd on the sag mill performance can be addressed by using the grind curves.
Get best pricesticky and the ball charge expands. The balls become coated and the grinding efficiency decreases. The pilot mill is also equipped with a sensor measuring the ‘ball and pulp toe and shoulder angles’ (see Figure 3). These data are then used to calculate the total pulp and ball charge angle (see Graph 5).
Get best priceof the SAG mill is transferred onto a vibrating screen. The oversize material is crushed in a pebble crusher, and the undersize is combined with the ball mill (6.71 9.91 m) discharge and sent to the cyclones. The SAG mill in phase 1 uses two 4100 kW synchronous motors and works with a constant 10.5 rpm rotational speed in two
Get best priceIn addition to high impact SAG mill grinding, media is used in other types of milling such as the finer grind of ball mills, tower mills, vibration mills and regrind mills. Many variables influence the size reduction performance in a mill, including the media size, shape & quality, the properties of the incoming ore feed, the ratio of feed to ...
Get best priceProduct Description. Grinding ball for initial assembly SAG mill refers to the grinding balls charged in the mill before the SAG mill reaches the design capacity (or normal production). Due to the instability of operating parameters,worker’s proficiency,feeding mineral and frequent impact between balls and liners,these circumstance maybe ...
Get best priceApr 01, 2002 The effect of ball charge on the rheology, if any, is rare in the literature. ... series of surveys of the ball milling circuits were hence conducted to determine the slurry rheology and to assess its effect on ball milling performance. 2. ... in the secondary grinding circuit to treat the product of AG/SAG mills. Each ball mill was closed by ...
Get best priceSAG Mill 2 Ball Mill Simulations of the Mill Power Effect on the Throughput Conclusions. ... zone from ball charge in the mill. - Also they allow to determine the single energy at impact, ... The Effect of the Mill Power on the Throughput 8200 8300 8400 8500 8600 8700
Get best priceModelling SAG milling power and specific energy. 2017-12-14 inside 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 (spe-cially the % +600 and the % 600 +100), on the rotational ...
Get best priceSAG mill. High rock charge volumes ie 15 to 20% gave maximum power draw from the mill motor but did not result in greater productivity of the SAG mill. The SAG mill total load is currently held at about 25% volume (14% ball charge and 11% rock charge), but has been as high as 32% has long been debated. One of the objectives of a review carried ...
Get best priceJun 24, 2006 A laboratory tower mill was used to investigate the effect of some variables on the power requirements of a plant mill. The grinding laws were tested for fine grinding and Charles` law and Rittinger`s law was found to most closely satisfy the experimental data. The effects of ball size, ball charge mass and media type were investigated.
Get best priceof SAG mill performance through 1. Changes in liner/lifter design to maximize throughput while maintaining acceptable wear levels. 2. Changes in ball size to maximize particle breakage without producing exceptionally high impact forces. 3. Changes in grate and pan lifter designs to decrease internal mill recycle and increase throughput.
Get best priceJan 01, 2015 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 % +6″ and the % −6″ +1″), on the rotational speed (N/Nc) and on the solid concentration by weight fraction inside ...
Get best priceSAG lifter and end cone geometry - can change SAG mill performance more than 20%-50% depending on P80 transfer size and Axb, some of which is published and some will be published at SAG 2015. SAG mill wear rates and performance changes with wear morphology, grate details, mill speed changes and optimization with speed control Ball feed size SAG ...
Get best priceCHARGE LEVEL. Maintaining an optimum charge in a SAG mill remains one of the fundamentals for efficient mill processing. If the charge level or the ball to charge ratio is incorrect, breaking liners and/or increasing power consumption is inevitable and can only result in degraded mill efficiency.
Get best priceThe final plan was to increase the ball charge in the SAG and ball mill to 10% v / v and 27% v / v, respectively; set the upper limit of the operating power in the ball mill to 5800 kW; use a TRIO TC Series crusher (without a power-/feed rate–controlling device, but with a feed bin) to crush pebbles for recirculation back to the SAG mill feed ...
Get best priceAbstract. An increase of over 10 % in mill throughput was achieved by removing the ball scats from a single-stage SAG mill. These scats are non-spherical ball fragments resulting from uneven wear of balls with included porosity. 30t of scats were removed from a total charge load of 70t.
Get best priceEvery second counts, and adjusting these parameters within seconds can have a significant effect on the wear of your SAG mill, which will effect on your bottom line. SAGwise TM reduces your mill’s ball-on-liner impacts with up to 45 per cent, which prolongs liner life and minimises media degradation. Further, it reduces energy consumption by ...
Get best priceJul 01, 2017 An important aspect of this full-scale predictive DEM + SPH model is that it can now be used to explore the effects of different operating conditions and design choices for screen panels, baffles mill retaining rings and to determine how they influence performance. Effects such as overfilling the mill with excessive ball charge or the build-up ...
Get best priceA 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 38000 HP motor. factors that affect sag mill performance - sufiruhaniat.eu. factors that affect sag mill performance
Get best priceSAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed. Dry Aerofall mills are run at about 85% of the critical speed. The breakage of particles depends on the speed of rotation.
Get best priceJun 06, 2016 SAG circuits may employ low to relatively high ball charges (ranging from 2% to 22%, expressed as volumetric mill filling) to augment autogenous media. Higher ball charges shift the breakage mode away from attrition and abrasion breakage toward impact breakage; as a result, AG milling produces a finer grind than SAG milling for a given ore and otherwise equal operating …
Get best pricecharge motion. It is well known that ball milling efficiency varies during the lifetime of the shell liner. For instance, the mill performance could become worse or better by putting in a new shell liner. Data from pilot plant test work illustrates the influence of the shell lifting effect on the grind for a primary grinding duty. Figure 5 shows the evolution of the
Get best priceOct 25, 2017 Furthermore, as mill performance is related to the complete size distribution of the feed material, all preceeding stages of comminution and classification which influence feed size distribution will have an effect on the performance of the grinding machine. c) Closed Circuit Grinding – Also closely related to the ability of a ball mill to perform most effectively on a particular material size distribution …
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