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material in the mill including the media which may be 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

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Ball Mill Power/Design Calculation Example #2 In Example No.1 it was determined that a 1400 HP wet grinding ball mill was required to grind 100 TPH of material with a Bond Work Index of 15 ( guess what mineral type it is ) from 80% passing ¼ inch to 80% passing 100 mesh in closed circuit. grinding cement,ball mill calculations, YouTube

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2014 10 01 modern grinding circuits include a SAG mill, a ball mill and/or a combination thereof. The use of Bond work indices coupled with other breakage tests, and the application of empirical efficiency factors, has become a standard for determining ore compe specific energy in modern grinding tency to calculate circuits.

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Table of ContentsSAG Mill ChargeSAG Mill Horsepower Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi autogenous grinding, it can be used to establish the exact grinding circuit and mill size. In the pilot plant tests, the tare power of the pilot plant mills should be determined

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energy power based circuit calculations. The model uses ore hardness parameters from testwork, circuit MacPherson correlated Autogenous Work Index (AWi). A particle size analysis of the mill ore charge at comparison with pilotplant data and operating plant data for similar ore

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A 13' x 6' SAG Mill has a reasonable range of: 20 to 30 TPH for gold ore SAG Ball Mill duty 25 to 40 t/h for copper porphyry SAG Ball Mill duty In Single Stage SAG duty, the approximate capacity reduces to only 8 to 13 TPH for gold ore duty. The autogenous mill itself is a coarse grinding device, consisting of tumbling drum with a 25% to 40

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A Method of C alculating Autogenous/ Semi Autogenous Grinding Mill Specifi c Energies Using a Combination of Bond Work Indices and Julius Parameters, then Applying Effi ciency Factors D Burgess1 ABSTRACT Since the days of mandatory high cost pilot plant testing in 6 ft 2 ft SAG mills autogenous size than an ore with a 3.5 SG. This

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