EFFECT OF BALL SIZE DISTRIBUTION ON MILLING …EFFECT OF BALL SIZE DISTRIBUTION ON MILLING PARAMETERS ... the optimal ball charge distribution for a set of operational constraints. 3 ... Laboratory grinding mill configuration 43 Preparation of monosize grinding media 44 Feed material preparation 46

SAG Mill Ball Sizing Grinding Classification Circuits ...With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 (up to ) 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

Improving Energy Efficiency Via Optimized Charge Motion ...Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between and kWh per ton of energy to reduce the particle size.

Autogenous mills, semiautogenous mills and ball mills for ...supported grinding mills up to the largest sizes. SAG/ball mill circuit incorporating pebble crushers and a POLYCOM® highpressure grinding roll. SAG and ball mill for gold ore grinding. One of three SAG mills with m diameter and 2 x 4000 kW drive power. These mills operate in conjunction with ball mills for iron ore grinding in Iran.

CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW …1 CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL T. Orser1, V. Svalbonas 2 and *M. Van de Vijfeijken 3 1Newmont Mining Corporation 10101 East Dry Creek Road Englewood, CO 80112, USA 2Metso Corp. 2715 Pleasant Valley Rd.

KnowledgeScapeGrinding Mill Charge Detection Sensors. The throughput and efficiency of a SAG mill depends on the volumetric load: An overloaded mill has reduced coarse ore breakage, as the cascading balls and rock cannot drop far enough, reducing kinetic energy for breakage.

size of ball mill vs power mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. Power drawn by ball, semiautogenous and autogenous mills A simplified picture of the mill load is shown in Figure Ad this can be used to establish the essential ...

Choosing a SAG Mill to Achieve Design PerformanceA further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the threefoot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2.

(PDF) Influence of feed size on AG / SAG mill performancePDF | On Jan 1, 2001, S. Morrell and others published Influence of feed size on AG / SAG mill performance

sag mill sound control Choosing a SAG Mill to Achieve Design Performance. A further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75% critical speed and less than 30% by volume load. Recent studies in the threefoot diameter SAG mill are instructive.

What is the typical difference between milling and ...Nov 14, 2016· Grinding and milling refer to the same thing, although grinding is generally used to refer to process and a "mill" the equipment that undertakes the grinding. In many metallurgical processes the first step before any separation of valuable and bar...

AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...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. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill …

I203 I204 INTRODUCTION ResearchGateoptimum feed size distributions are made. ... with sag mills being increasingly less so as the ball charge is increased. ... level dropped the feed size to the sag mill became coarser and as a

Mill Scanner (Grinding Mill Charge Measurement System ...Oct 13, 2016· Mill Scanner (Grinding Mill Charge Measurement System) Installation Published on October 13, 2016 October 13, 2016 • 28 Likes • 1 Comments

AN OVERVIEW OF THE DESIGN, CONSTRUCTION, …SAG Mill Feed Size, F100 235mm Feed Size, F80 115mm Ore SG ... The final selection of the SAG mill volume, operating ball charge level and installed power was ... The sectioning summarised in Table 4 represents the optimum point in the tradeoff between

project for optimum grinding time of goldlength of grinding time . Calculate and Select Ball Mill Ball Size for Optimum Grinding. In Grinding, selecting (calculate) the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do . Read more

Composite PulpMax™ mill liners can lower costs and improve ...“Many SAG mill liner designs perform very well in their objective to achieve the desired particle size and protect the mill structure. However, no matter how well a mill is operated, and no matter how well a liner design performs, a mill is only as good as its ability to discharge the slurry out of the mill.

OUTOTEC AUTOMATION SOLUTIONS FOR GRINDING …optimal particle size for downstream processes, and increased throughput with minimized energy usage. The Outotec ACT grinding optimization system utilizes feed particle size data from RockSense, charge analysis from MillSense, and slurry particle size measurements from PSI, as well as other available online measurements.

Optimizing Performance of SABC Comminution Circuit of …Optimizing Performance of SABC Comminution Circuit of the Wushan Porphyry Copper Mine—A Practical Approach ... circuit included an increase in the SAG mill ball charge from 8% to 10% v/v; an increase in the mill ball ... all ores will have an optimum particle size which maximizes the economic

grates hammer crushergrates opening in sag millgrates opening in sag mill,grates opening in sag mill grate slot size liner design,with the advent of large diameter sag mills,the mill technology hammer . Contact Us ball mill grate discharge . for ball and SAG mill applications, Ball mill grates limitation on the smallest ball size is …

AMIT 135: Lesson 7 Ball Mills Circuits – Mining Mill ...Ball Size as Initial Charge. Commercial ball sizes 10 – 150 mm; Number, size and mass of each ball size depends on mill load and whether or not the media is being added as the initial charge. For the initial chargin of a mill, Coghill and DeVaney (1937) defined the ball size as a function of the top size of the feed, , d↓V = K√F

SINGLE STAGE SAG/AG MILLING DESIGN SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semiautogenous / autogenous (S/AG) milling has become a common design for a variety of ore ... 80% passing size between 106 and 75 µm. To mill in single stage SAG configuration, the ... 4 High ball charge SAG mill or ROM Ball mill (15 to 25% ball charge) Low competency ore Hidden Valley ...

KnowledgeScapeUtilizing a charge sensor results in better grinding, clear vision of the mill contents at all times, reduced steel and power usage, longer liner life, and significantly increased profits. Knowledgescape’s mill scanner is the ultimate tool for increasing SAG mill throughput and reliability. GrindingExpert™ isn’t just about SAG mills.

Ball Mill Foundation Design Example YouTubeFeb 18, 2019· Feb 8 2014 ball mill foundation design example Kuntang Mining Dec 04 Ltd Bridge Deck Vertical Roller Mill for Maintenance manual ball mill operation …

What should be the ideal proportion of ore to grinding ...Ensure that the charge level is high enough so that the cateracting particles impact upon the toe of the charge and not on the shell liners. Having said all that, the best type of mill for coarse grinding remains the rod mill. However, this type of mill has become impopular since the advent of SAG Mill/Ball Mill circuits that replaced the ...

Autogenous and SemiAutogenous Mills | FLSAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill.

Autogenous and SemiAutogenous Millsthis test provide accurate information for the optimum mill sizing and circuit design for a commercial installation. Application AG/SAG mills are normally used to grind runoffmine ore or primary crusher product. Feed size to the mill is limited to that size which can be practically conveyed and introduced into the mill. The mill

TECHNICAL NOTES 8 GRINDING R. P. King Mineral Tech83 Centrifugal force outward Fc mp 2 Dm 2 () is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners. Gravitational force Fg mpg () The particle will remain against the wall if these two forces are in balance ie.

A Method of C alculating Autogenous/ SemiAutogenous ...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. Rod mill and AG/SAG mill products are similar and tend to

Optimum SAG Mill Discharge Density Grinding ...Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.

Increased production and energy efficiency for optimized ...Apr 24, 2014· In order to achieve optimal performance of downstream processes with the finer ROM, a number of changes and adjustments were made to the crusher, SAG and ball mill circuits. The resulting mill throughput averaged 4,100 tph for the three trial blasts, and plant throughput above 4,500 tph was achieved for several hours during these trials.

SAG/AG SCU MillwatchCHARGE 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.

Outotec Grinding Mills OutotecOutotec® Grinding Mills. Optimize grinding mill performance, efficiency, and availability to ensure you meet your plant's operational targets. Outotec highperformance grinding mills use advanced simulation tools for the best possible process efficiency, mechanical reliability, and maintainability.