Modelling SAG milling power and specific energy

Mining Engineering Department, Universidad de Chile, Beauchef 850, Santiago 8370448, Chile article info Article history: Received 20 December 2013 ... size, ball load, mill speed and % solids will represent the total load. Ball Mill SAG Mill Scw Jb Pc % -6" +1" N/Nc Fresh …

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Sample Preparation and Size Reduction Laboratory has a jaw crusher, a steel roll and ball mill, and a ball ceramic mill for this purpose. A Hardgrove mill and a Bond mill, used in the calculation of Bond Work Index, is in the Laboratory inventory. In the laboratory, there is also one hydrocyclone used in the classification processes.

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Ball mills 5.5 m (18 ft) in diameter and larger tend to use energy delivered to the mill less efficiently than smaller diameter mills, particularly when the large mills carry 40% by volume ball charges. This paper will explore factors used in scaling up ball mills, showing where the advantages of one factor can possibly be negated by another factor.

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The ball mill is the most common ore grinding technology today, and probably more than 50% of the total world energy consumption for ore grinding is consumed in ball mills.

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This paper shows how small calculators can be used for ball mill simulations. Two calculations are examined, the first to calculate the mill parameters and the second to predict the mill product. In the case of small programmable calculators the programs for two common models are given.

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In vein mining, an entry perpendicular to the vein. Cross entry - An entry running at an angle with the main entry. Crusher - A machine for crushing rock or other materials. Among the various types of crushers are the ball mill, gyratory crusher, Handsel mill, hammer mill, jaw crusher, rod mill, rolls, stamp mill, and tube mill.

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This paper studies the grinding behaviour of vanadium-titanium magnetite concentrate in a ball mill. The grinding kinetics, surface morphology, lattice distortion, wettability and moisture capacity were analysed. ... The Australasian Institute of Mining and Metallurgy. 204 Lygon St, Carlton VIC 3053 Australia.

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The performance of AG mills has been lower than the target value indicated by an increase in the product size (P 80; 80% passing size) from 450 μm (target) to 515 μm and low power draw (50% of nominal). By simulation it was found that increasing the liner lifter face angle from 7 to 30° while keeping the original lifter height (i.e., 22.5 cm ...

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Today, the "average" ball mill runs upwards of 18 to 22 feet in diameter and pulls 12 to 14 thousand horsepower. SAG mills were introduced to the industry in the late 1960's and have grown from 6,000 hp, or so, to leviathans drawing 30,000 hp from motors that wrap around the enormous mill …

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Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recirculated back into the mill to be reduced.