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SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42'' () in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44'' () diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles.
Ball Mills. The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds.
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 tear.
process, which is choosing a SAG mill to accomplish the required specified design performance. At the test work stage, each ore hardness data point is a unique and discreet bit of information that represents the energy required to grind the ore represented by that sample at optimum SAG conditions.
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 (specially the % +600 and the % 600 +100), on the rotational speed (N/Nc)
Bond Rod Mill Work Index, RWi, kWh/t Table 1. Example of AG/SAG Ball Mill Circuit Wio Calculations [1] [2] ABstrAct Optimum use of power in grinding, both in terms of grinding efficiency and use of installed capital, can have a large effect on profitability. Mill operators have long used operating work indices to evaluate grinding circuit
Jun 19, 2015· The effect of Ball Mill RPM speed going from subcritical to supercritical helps understand the Ball Mill Working Principles of ballonball VS ballonshell grinding. The Motion of the Ball Charge
Higher energy collisions cause liner damming and increased grind ball consumption. Mechanics Ball and ore particles follow Newton''s laws of motion. 1. A mill speed approaching 80% of critical can optimize grinding action and reduce wear. ... DEM software simulated SAG charge motion, ... describes the performance of ...
processing at an ore mill at Bougainville, New Guinea. Since then innovation has continued with the first GMD for a doublerotating ball mill in Carlin, Nevada, meeting a 160 °C heat challenge at the mill shell. GMDs have now been supplied for the world''s largest autogenous (AG), semiautogenous (SAG) and ball mills, fulfilling the highest power
Precise control of SAG mill loading and flotation cell level is critical to ... interacting variables (such as rotation speed and ore feed rate on SAG mill weight). .... The effect of the feedforward variable is then simply added to ... A semiautogenous grinding (SAG) mill is a rotating cylinder containing steel balls that is used as. Read More
benchmark performance comparisons and are made with other power modelling techniques. Practical ... modern grinding circuits include a SAG mill, a ball mill and/or a combination thereof. The use of Bond ... MacPherson correlated Autogenous Work Index (AWi). A particle size analysis of the mill ore charge at
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,,
charge level and ball size were studied in the SAG mill circuit as well as ... Figure 3 illustrates the effect on ball mill cyclone performance due to the change from series to parallel cyclone ...
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 like to know if there''s is any way to determine the optimal ball charge
1 Optimization of the design of AG Mill shell liners at the GolEGohar concentration plant M. MalekiMoghaddam1, M. Yahyaei 2, A. HajiZadeh 3, H. Asadi 4 and S. Banisi 5 1 University of ...
charge 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 .
• Mill lining knowledge centers in your region are backed by global support • Mill lining manufacturing in 14 factories globally The mill is at the heart of your production process. The yield of your grinding operation is highly dependent on the performance of your mill''s lining. Select your mill .
Predictions can also be made to determine the effect of changing ore parameters, allowing the user to see how the plant performance will ... SAG mill and the ball mills were all drawing significantly less power ... with ball charge at only 27%. Additionally, the ball top size was mm, which is too small for the mill, ore SG, work ...
PERFORMANCE ENHANCMENT TOOLS FOR GRINDING MILLS 103 ... instrumentation to sense load movement effects. The load movement inside of a SAG mill can be ... providing accurate information about the load movement and the ratio of balls and ore inside the mill. This paper discusses two new performance enhancing tools available to meet these needs.
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
Jan 08, 2016· In this training module, we''ll cover the workings of a semiautogenous grinding mill, or SAG mill, that''s designed to be the first stage of a grinding circuit. Ore that''s crushed in a primary ...
2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALLMILL SCALEUP Ballmill scale up (Bond''s Law)Data: zBond work index w i zFeed D f and product d size (both 80% cumulative passing) Result: The specific grinding energy w Mill power draw P = wT, where T the mill capacity Mill dimensions (from Tables or charts)
Semiautogenous (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 .
TECHNICAL NOTES 8 GRINDING R. P. King. 82 ROOLVLRQ ... 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 autogenous mill or a mixture in a semiautogenous mill,
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