### Difference Between Sag Mill vs Ball Millmech4study

Oct 12 2017 · SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9 to 20 .This process takes place inside the large rotating drum of SAG mill which is filled with balls partially. revs = Cumulative number of SAG test mill revolutions to 80 passing 1.7mm m s = SAG mill feed sample mass grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution S d-BWI = 1.102 44.5 / (P cs 0.23 G pb 0.82) / (10 / P 80 1/210 / F 80 1/2) where S d-BWI = Bond ball mill work index on SAG ground

### Starkey Associates Inc.Leaders in Comminution Design

revs = Cumulative number of SAG test mill revolutions to 80 passing 1.7mm m s = SAG mill feed sample mass grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution S d-BWI = 1.102 44.5 / (P cs 0.23 G pb 0.82) / (10 / P 80 1/210 / F 80 1/2) where S d-BWI = Bond ball mill work index on SAG ground Oct 12 2017 · SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9 to 20 .This process takes place inside the large rotating drum of SAG mill which is filled with balls partially.

### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

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. Aug 11 2010 · Re MATERIAL RETENTION TIME IN A BALL MILL VRM. You could do that by measuring the material flowrate Q tons/h through the mill as well as the quantity M tons of material that accumulates within the mill. The retention time also called residence time is the ratio (M/Q) h .

### ore ball mill charge

calculate ball charge ball mill Solution for ore mining. The rods grind the ore by tumbling within the the mill similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling the length to diameter ratio is maintained at 1.4 to 1.6. article osti_895022 title = ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION author = Rajamani Raj and Delgadillo Jose and Duriseti Vishal abstractNote = The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient breakage of particles depends on the

### SAGMILLING . . Mill Critical Speed Determination

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. We offer autogenous (AG) semi-autogenous (SAG) ball rod and pebble mills in sizes ranging from kWs up to 30 MW. Our product range also includes a number of unique solutions including the world s largest acid-resistant grinding mills which can operate with extremely corrosive slurry.

### A Method of C alculating Autogenous/ Semi-Autogenous

SAG mills mimic the same shortcoming. It follows that in order to obtain the speciﬁ c energy (SE) to 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. - 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

### how to calculate charge volum of ball mill

how to calculate sag mill ball charge BINQ Mining. The SAG mills make use of a minimal ball charge of 6 to 15 It provides a large diameter and short length primary ball mill efficiency calculations Primary mill circuits types is very difﬁ cult to accurately predict or calculate A SAG mill ball charge level of 14 percent was targeted. Online Chat one SAG mill (9.75 dia.(m) 3.88 length(m)) following two parallel ball mills (5dia.(m) 7lenght(m)). The aim of this research work was to investigate on the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method. Miduk SAG Mill circuit is shown in Figure 1. Figure 1 Diagram of Miduk Copper Complex SAG Mill Methods

### how to charge media in ball millMC World

2020-03-25 We can calculate the steel charge volume of a ball or rod mill and express it as the of the volume within the liners that is filled with grinding media. While the mill is stopped the charge volume can be gotten by measuring the diameter inside the liners and the distance from the top of the charge to the top of the mill. - 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

### SAGMILLING . . Home

Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations. Grinding circuit design tools including for SAG mill-ball mill circuits and geometallurgy energy models are available to subscribers. 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 number of lifters (including those buried in the charge) the fraction of the mill under the charge is determined.

### 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. SAG mills mimic the same shortcoming. It follows that in order to obtain the speciﬁ c energy (SE) to 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.

### 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. Often the ball used in ball mills is oversize "just in case". Well this safety factor can cost you much in recovery and/or mill liner wear and Difference In Ball Mill And Tube Mill The difference between ball mill and tube mill is the ratio of the tube length to the tube diameter tube mills have a ratio of 48 t m3 specific gravity is 7879 t m3 example calculate the charge of grinding balls of a threecompartment mill for dry grinding Mill Difference Between Ball Mill And Tube Mill

### Ball Mill Critical Speed Working PrincipleYouTube

Jun 20 2015 · The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding. The Motion of the Ball Charge We offer autogenous (AG) semi-autogenous (SAG) ball rod and pebble mills in sizes ranging from kWs up to 30 MW. Our product range also includes a number of unique solutions including the world s largest acid-resistant grinding mills which can operate with extremely corrosive slurry.

### sag mill ball charge calculation

SAG is an acronym for Semi-Autogenous Grinding SAG mills are autogenous mills but 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 (128m) in diameter powered by a 28 MW (38 000 HP) motor. Ball Mill Efficiency Calculations 2018724 ball top size bond formula calculation of the top size grinding media balls or cylpebsmodification 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 Mill How To Calculate Ball Mill Efficiency

### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

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. Enter the number of lifters that are exposed above the mill charge. Fractions are acceptable and should be used in the case where the charge does not sit uniformly in the mill. For example you may have 29 rows exposed at the discharge end of the mill and only 28 exposed at the feed end.

### Orway Mineral Consultants Canada Ltd. Mississauga ON

and ball mills have almost become obsolete in the move to higher milling rates required to process lower metal grades. Grinding circuits with fully autogenous (AG) or semi-autogenous (SAG) mills often combined with ball mills are now the standard to meet the high capacity requirement for processing ores with lower metal grades. calculating steel ball charge in ball mill calculating steel ball charge in ball mill . For each project scheme design we will use professional knowledge to help you carefully listen to your demands respect your opinions and use our professional teams and exert our greatest efforts to create a more suitable project scheme for you and

### Ball Mill Critical Speed Working PrincipleYouTube

Jun 20 2015 · The effect of Ball Mill RPM speed going from sub-critical to super-critical helps understand the Ball Mill Working Principles of ball-on-ball VS ball-on-shell grinding. The Motion of the Ball Charge article osti_895022 title = ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION author = Rajamani Raj and Delgadillo Jose and Duriseti Vishal abstractNote = The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient breakage of particles depends on the

### SAG-MILL Ball chargeGrinding Classification Circuits

SAG-MILL Ball charge (1 reply and 2 comments) Gh99. 4 years ago. Gh99 4 years ago. I am a new in an iron ore plant were we are with magnetite ore using two Aerofall Mills but it s very hard for us to control the the mill feed rate and we also have a problem with the Ball charge we ve tried different charges but it s still a problem I would steel balls in a ball mill or large lumps of ore in an autogenous mill or a mixture in a semi-autogenous mill as well as the slurry that makes up the operating charge. Let Jt be the fraction of the mill volume that is occupied by the total charge Jb the fraction of the mill volume that is occupied by steel balls and E the voidage of the balls

### Mill SpeedCritical SpeedPaul O. Abbe

Mill Speed . No matter how large or small a mill ball mill ceramic lined mill pebble mill jar mill or laboratory jar rolling mill its rotational speed is important to proper and efficient mill operation. Too low a speed and little energy is imparted on the product. We can calculate the steel charge volume of a ball or rod mill and express it as the of the volume within the liners that is filled with grinding media. While the mill is stopped the charge volume can be gotten by measuring the diameter inside the liners and the distance from the top of the charge to the top of the mill. The loading or change volume can then be read off the graph below or