sag mill ball charge

sag mill ball charge

Frozen charge detection and automatic loosening with ...

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 was 100 …


by volume load. Recent studies in the three-foot diameter SAG mill are instructive. The following graph shows the relevant facts as Figure 2. Figure 2: Pilot Plant kg/hr Vs Charge % by Volume This data is indicative of trends that were happening in the 3-ft. diameter SAG pilot mill. They have not been proven in large commercial scale mills.

Keeping an eye out for grinding mill dropped charge and ...

maximum ball size should be checked against existing formulae, such as Bond's ball size recommendation. Hard ores are best ground with high ball charge levels and high mill speeds. Soft ores are best ground with lower ball charge levels and lower mill speeds. Media quality is rarely a problem if you are buying from a reputable ball vendor.

Optimization of mill performance by using

11/6/2019· In all three cases (Ball, SAG or AG mill), when the equipment is stopped, the material inside can dry up over time to form a solidified charge. When the mill is restarted, the solidified charge needs to break and tumble, otherwise a problematic dropped charge can form.

Mill Steel Charge Volume Calculation

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.

Choosing a SAG Mill to Achieve Design Performance

Outotec has extensive knowledge of comminution technologies and processes to ensure we provide the optimal solution for your needs. We offer autogenous (AG), semi-autogenous (SAG), ball, rod, and pebble mills in sizes ranging from kWs up to 30+ MW.

Outotec Grinding Mills - Outotec

Attrition mill is a type of grinding mill by kinds of media to crush lump to powder-like substances. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill, rock and a small ball charge (~10%), used in Semi Autogenous Grinding (SAG) mills, balls of various sizes in Ball Mills and less commonly these days, steel rods in Rod Mills.

Sag Mill Ball Charge Calculation -

1/8/2016· In this training module, we'll cover the workings of a semi-autogenous grinding mill, or SAG mill, that's designed to be the first stage of a grinding circuit. Ore that's crushed in a primary ...


Abstract: In semi-autogenous grinding (SAG), the grinding mill inventory, (i.e. volume of total charge, volume of ball charge, etc.) is important in determining the optimum operating condition for maximum production (tph), minimum specific energy (kwh/t) or lowest cost ($/t). A two-dimensional graphical method is presented for determining the actual ball charge within the total charge when ...

What's the difference of Ball mill, SAG mill, AG mill?

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 ...

SAG mill ball charge determination and its influence on ...

@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 ...

Mill (grinding) - Wikipedia

Rely on our proven track record of SAG and AG Mill superiority. Since the early 1980s, we have been designing and manufacturing Semi-Autogenous (SAG) and Autogenous (AG) Grinding Mills under the Fuller-Traylor brand. Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only.

calculates the grinding charge of a ball mill | Mining ...

calculates the grinding charge of a ball mill . BY admin ... This calculator is a good start to evaluate the grinding ball charge after mill … TechnoMine Services, LLC. mill charge and speed. SAG Mill product P80 values are typically in the range of … OPTIMIZING SAG MILL PRODUCT SIZE IN SAG MILL _ BALL MILL GRINDING CIRCUITS

Difference Between Sag Mill vs Ball Mill - mech4study

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.

Ball Mill Critical Speed & Working Principle - YouTube

Ball Storage Ball Feeder Mills (single or multiple in line) mlete all adli Sstems rm elier t ills Ball storage capacities to suit mill usage and various ball diameters (27 - 150mm). Complete systems available from delivery through to mill feed. Hoist operated kibble option is the simplest solution for low ball consumption. Steel balls diameters ...

Technical Program - SAG Conference

10/12/2017· 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.


control of the grinding media volume based on wear rates within the SAG mill, increasing the grinding media load in the SAG mill, the use of a blend of ball mill balls to increase finer size particles and smaller cyclone apex. These recommendations did not result in improvement in mill …

Autogenous and Semi-Autogenous Mills - ScienceDirect

SAG and Ball Mill Online Ball Charge Level Measurement by Sound, Churata 14:15 The Value of Daily HIT Ore Hardness Testing of SAG Feed at the Meadowbank Gold Mine, Kojovic, Bergeron, & Leetmaa The Dynamic Influence of Ball Mill Wearing Profile in Mill Performance, Torrealba, Dupont, & Allaire SAG Mill Grinding Media – Is Bigger Really Better?


4 High ball charge SAG mill or ROM Ball mill (15 to 25% ball charge) Low competency ore Hidden Valley, Nzema, Sepon, UG2 ores (South Africa), Yanacocha 5 Low ball charge, high speed SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein ...

SAG/Ball Mill Optimization | KnowledgeScape

EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL PERFORMANCE Niyoshaka Nistlaba Stanley Lameck A dissertation submitted to the Faculty of Engineering and The Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg, October 2005

Autogenous and Semi-Autogenous Mills | FL

Online Optical Monitoring of the SAG Mill Chamber, Sepúlveda & Duarte. 79. 14:00. SAG and Ball Mill Online Ball Charge Level Measurement by Sound, Churata. 80. 14:15. Teck's HVC Adaptive Cruise Control for Secondary Grinding, Nuñez & Hahn. 81. 14:30. Question Period. 15:00. Break


are Rio Paracatu Mineração (RPM) with a 38ft, 20 MW SAG Mill in Brazil and Lumwana having a 38ft, 18 MW SAG and one 26ft, 16 MW Ball Mill in Zambia, all three mills put in operation in 2008, as well as Los Bronces, Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of 16.4 MW commissioned in 2011. In the