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An autogenous mill of ID 6.7. m and an effective grinding length of 2.1 m was fed with ore of SG 3.8 to 20% of its volume.. The mill was operated continuously 24 hours per day at 1200 t per day and 75% of the critical speed.The solids in the mill charge were at 80% solids. Estimate:1. The power consumption per tonne per day

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  • AUTOGENOUS MILL FEED PREPARATION TO REDUCE
    AUTOGENOUS MILL FEED PREPARATION TO REDUCE

    This approach consists of preparing feed to an autogenous mill that contains 20% coarse media rock and 80% of material crushed to pass 37 mm. Results of pilot-scale testing for two iron-ores will be presented to show that a 10% to 12% reduction in unit energy consumption is possible with prepared feed, compared with feeding the mill

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  • Autogenous Grinding - Mining Fundamentals
    Autogenous Grinding - Mining Fundamentals

    Autogenous grinding is a process of grinding ore in a rotating cylinder, using large pieces of the same ore. Autogenous mills operate mechanically like ball mills; however, the media used for grinding differs. Simply put, in autogenous grinding, the media is also the material that is being ground, whereas in other milling methods steel or

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  • MINERAL PROCESSING - MILLING
    MINERAL PROCESSING - MILLING

    Table 4: Material Suitability for Autogenous Mills Rod Mills Description The rod mill is another tumbling mill but having a large percentage of its volume (30 - 40%) loaded with steel rods. The rods are placed axially in the mill and are loose and free to move within the mill. The internal lining of the drum has a series of lifters which raise

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  • Inside An Autogenous Mill
    Inside An Autogenous Mill

    AG Autogenous Grinding . Tests were run with a short mill inside length of 26-3/8″ or diameter-to-length ratio of 2 50 to 1 The same mill was then lengthened to 48-3/8″ diameter-to-length ratio of 1 36 to 1 Test Conditions Autogenous Pilot Mill Drive – 30 HP 440 V motor speed reducer and chain drive Inside diameter – 66 inches measured inside of shell liners Get price

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  • Autogenous and Semi-Autogenous Mills - ScienceDirect
    Autogenous and Semi-Autogenous Mills - ScienceDirect

    Jan 01, 2016 Some dry autogenous mills operating in Canada are 8.5 m in diameter and 1.5 m in length. These are known as Aerofall mills. The Cadia Hill (Australia) wet SAG mill is 12.2 m in diameter with a 20 MW motor and in 2004 was the largest diameter mill in operation in the world

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  • AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill
    AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill

    Autogenous mills range up to 12 meters in diameter. The length-to-diameter ratios in the previous table are for normal applications. For primary grinding, the ratio could vary between 1:1and 1.8:1. For fine regrinding in open circuit, the ratio ranges from 1.3:1 to 1.5:1. Some ball mills are separated in to compartments by grates

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  • A General Model for Semi-autogenous and
    A General Model for Semi-autogenous and

    I' atl0n mo d e s I (2-4) f . or seml-autogenous (SAG) and fully-autogenous (FAG) mills. This is largely because the physical processes of breakage occurring in these mills are more complex than those in it and then use an approximate simplified form of the models to

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  • Semi Autogenous Mill - SAG Mills For Sale | AGICO SAG Mill
    Semi Autogenous Mill - SAG Mills For Sale | AGICO SAG Mill

    The semi-autogenous mill is a new type of grinding equipment with both crushing and grinding functions. It has the advantages of simple process flow, small investment, short construction cycle, and easy operation. It can directly grind raw materials or coarsely crushed materials to 0.074mm. The grinding ratio can reach 4000-5000, which is ten

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  • What is the difference between a SAG mill and ball mill?
    What is the difference between a SAG mill and ball mill?

    Principle of SAG Mill operation. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also 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%.[6][7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP

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  • (PDF) Design of a typical Autogenous Mill: Part-II
    (PDF) Design of a typical Autogenous Mill: Part-II

    Dec 23, 2013 Autogenous milling means a pr ocess i n which the size of the constituent pieces of a sup ply. of rock is reduced in a tumbling mill purely b y the inte raction of the pieces, or by the

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