Apr 21, 2017· Optimization of the Design of SAG Mill Internals Using High Fidelity . Example of HFS modeling of ball and particle motion in a slice of SAG mill using . influence on mill performance, it is not surprising that engineering rules of thumb for one mineral producer decided to evaluate charge …

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.

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 9.7% ball level was measured relative to the slurry, 398mm below it.

The mill performance will affect the circulating load. I don't get why you think that the toe angle will increase and there will be more lifting. ... Most SAG mill are not optimized for the combined SAG & Ball mill throughput such as: ... power of mill motor, capacity, ball size, numbers & diameter of hydrocyclone ball charge, mill speed. I'm ...

Ball charge (fraction of volumetric loading and ball size) Mill operating conditions including mill speed (for circuits with variable-speed drives), density, and total mill load; The effect of feed hardness is the most significant driver for AG/SAG performance: with variations in ore hardness come variations in circuit throughput. The effect of feed size is marked, with both larger and finer feed sizes having a significant …

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 …

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 mill discharge product size in relation to the lifting effect of the liners.

PERFORMANCE ENHANCMENT TOOLS FOR GRINDING MILLS 103 The need for new instruments ... SAG and ball mills have grown in size and there are now many operational mills in the range of 28–40 feet in ... Effect of mill speed and lifter profile on load trajectors Figure 2. Schematic view of ball …

A crucial parameter that defines the performance of a mill is the energy consumption. The power supplied to ... The effect of mill charge is primarily through the shifting of the center of gravity and the mass of the charge. As the ... steel balls in a ball mill, or large lumps of ore in an

SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.

effect of ball mill media on sag mill performance Cheap 2 38mm steel balls deals. Find the cheap 2 38mm Steel Balls, Find the best 2 38mm Steel Balls deals, Scaffold piercing Bars SPRING EFFECT 4mm Balls 38mm Long 316l surgical steel barbell . high chrome cast steel grinding iron media ball for ball milling sag mill.

Aug 09, 2017· SAG mill fractional total filling, Jt, fractional ball filling, Jb, and fractional rock charge filling, . where SMRCi is the mass of SAG mill rock charge in size i [t], SMDCi is the mass of the SAG mill.

SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates. Typical tests required to define a hardness variability function, are given below in Figure 1.

Metallurgical ContentEffect of Ball Diameter, or Rod Diameter VariationGrinding Media Density VariationsMill Efficiency & Mill FillingEffect of Balls Hardness on Rate of Grinding Size Distribution of the Balls in the Mill Charge In the previous chapter the influence of the various physical quantities defining the mill and mill charge has been studied in connection with the performance of a ...

was to locate the variation of ball filling in the mill. Ball Charge Program Abrasion In this section, ball abrasion was calculated via manufacture`s ball charge program. At the time of this research, mill ball charged, feed rate, and average moisture were 7 tons (ball size …

(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FLSmidth ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).

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-

May 28, 2018· Optimizing your SAG mill operation International MiningMar 21, 2007 crushers fed material directly to large ball mills, the energy efficiency discharge capacity or mill throughput of AG and SAG grinding mills.The Selection Design and Application of Mill Liners for Large Wet Liner design has a significant effect on mill performance and liner ...

Ball Mill Loading - Dry Milling Ball Mill Loading (dry milling) When charging a ball mill, ceramic lined mill, pebble mill, jar mill or laboratory jar use on a jar rolling mill it is important to have the correct amount of media and correct amount of product.

Highlights A multi-component (2D) AG/SAG model has been developed. The model relies on independent breakage and discharge rates for each component. The model was validated using pilot plant and industrial survey 2D data. The model accurately described the effect of feed composition on mill performance.

of SAG hardness variability have been discovered for SAG mill and ball mill design measurements. 1. Principal Consulting Engineer, Starkey & Associates Inc, …

Performance enhancement tools for grinding mills D.G. ALMOND* and W. VALDERRAMA† *FFE minerals USA Inc., Performance Enhancement Technology, Bethlehem, PA USA †Federico Santa Maria Technical University, Department of Materials Science, Valparaiso, Chile Operation of large SAG mills requires a change in the conceptual approach to grinding processes.

Ø SAG mill efficiency was highly dependent on recycle crushing. Ø The SAG mill liners packed reducing power draw and the liner design also caused overthrow of steel balls against the mill shell.

Jun 30, 2017· Mine-to-mill optimisation: effect of feed size on mill SRK Consulting. Over the past 15 years, mine-to-mill studies have focused attention on the impact blast fragmentation mills and onto the secondary ball mill circuits, alleviating a Metallurgy and Mineral Processing .. crushing, SAG milling and ball …

Mar 02, 2018· The ball size is one of the critical factors for determining the mill performance of ball mills. . very large. μ is the particle size at which the value is 0.5 and Λ is a positive The breakage of a uniformly sized particle results in the production of an. effects of grinding media shapes on ball mill performance ... ball charge in ...

Semi-autogenous (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 0.90kg/mt.

number of wear resistant materials as well. The 1-m mill was used to investigate the effects of three lifter configurations, namely Hi (High), Rail and Hi-Lo (High-Low), and mill speeds on the mill performance. The MillTraj software was also utilized to simulate the outermost charge trajectories of the mill.

Abstract. 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.

Mar 03, 2016· ROCKY 3D DEM simulations of grinding media flow can be used to investigate the relative performance of comminution devices.

a sag mill monitor instrument to optimize mill performance . Gino Rivera and . Disney Caceres. Cía. Minera . ... Undesirable impacts caused by steel balls striking the mill liners were minimized by integrating the Impactmeter signals with the ECS/ ... impacts generated inside SAG mills by the tumbling charge are monitored and interpreted so that

Module3 - AppE - SAG Mill Power Draw - Free download as PDF File (.pdf), Text File (.txt) or read online for free. ... can be considered a special case of “SAG” in which the ball charge is zero. ... or discharge grate performance (both its affect on slurry level in the mill, and its power consumption). It is also impossible to define

DSM screens 7.51 5. mill speed etc.05 9. high density ore 7.(6) can be used to estimate the effect of variations in ball load. 120mm balls 1 1 1 4.11 AG AG 1 1 closed circuit.73 open circuit 1 5. If a set of rates have been measured by plant survey and the ore breakage characteristics determined using the JKMRC's test methods.

Jun 19, 2015· a) Ball charge level has a significant effect on overall charge motion. The tendency of the charge to slip back along the rising side of the shell is reduced as charge level increases, until reaching between 30 to 40 percent of mill volume (in one particular test mill) where slip ceases.

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.,

FLSmidth AutoCharge equipment has been proven internationally to streamline the single-size recharge practice for ball sizes from 2.5” (63mm) to 6.0” (152mm) and to optimize milling performance in terms of mill throughput (tons/hr), power efficiency (kwh/t/ophr) and ball consumption (lbs/ton).

Simulation 4 included changes adopted in Simulation 3, along with (a) reducing the SAG mill ball diameter from 5" to 4", (b) reducing the ball mill ball diameter from 2.5" to 2" and (c) increasing the ball charge in the ball mills from 27.5% to 30%.

At the end of 2010, the SAG mill ball size was changed to 10mm but pro5 ved to be unsuccessful, with the mill becoming unstable due to insufficient ball charge and a feed topsize of between 38 mm and 50 mm. A blend of 125/105 mm media was used from December 2010 until March 2011 when the 125 mm media was fully restored as the make-up ball size.

Achievement of High Energy Efficiency in Grinding . in sag mill_tromel size calculation in ball mill Grinding Mill,Types SAGDesign Case Studies Starkey & Associates. design new grinding circuits for. effect of balls charge on sag mill performanceBasalt Crusher. about effect of balls charge on sag mill performance.of Mill Liners Size