• SAG Mill Ball Size Evaluator | Evaluation Factors ...

    SAG Mill Ball Size Evaluator | Evaluation Factors | Calculate Diameter. If the feed top-size is >100 mm, then typically a 5″ ball is suitable. To date, I have not seen any clear evidence of improved throughput from a 5.5″ or 6″ ball size alone (combined with lifter profile changes, yes). Ball load is also a factor,...

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  • Autogenous mill and semi-autogenous mill - polysiususa.com

    The maximum feed size is between 200 mm and 500 mm. The AG/SAG mill is normally installed upstream of a tube mill operating in closed circuit with hydrocyclones. The material discharged from the AG/SAG mill is either fed directly to the tube mill or first screened.

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  • Optimum SAG Mill Discharge Density - Grinding ...

    Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.

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  • Mill (grinding) - Wikipedia

    SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) 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. SAG mills are characterized by their large diameter and short length as compared to ball mills.

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  • IMPROVEMENTS IN SAG MILL THROUGHPUT FROM FINER …

    SAG milling is followed by a 24 x 39 ft, 13 MW ball mill in closed circuit with a cluster of 26 inch (660 mm) cyclones. After classification, the milling product is …

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  • Design SAG mill production when you need it most: In day 1 ...

    Feed Size, F80: Primary crushed ore is mandatory to feed any SAG mill. Typical feed size range is 80% passing 130 to 160 mm. Softer ores will be a little finer but the finer size is not sustainable when the ore becomes hard. Pre-crushing to finer sizes enhances throughput as does crushing of pebbles from the SAG mill (usually minus 60 mm).

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  • SAG Mill Grinding Circuit Design

    The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance.

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  • or ‘Mine-to-Mill 2.0’

    Feed size effects what size is important? historically, Mine-to-Mill has – focussed on blasting alone – generation of more fines • pass through SAG mill onto ball mill circuits • higher throughput (e.g. 10% to 30%) • coarser grind size (possibly) fine <25mm medium 25 - 75mm coarse >75mm

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  • AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

    Semi-Autogenous Grinding (SAG) Mill. Wet or dry. Higher capacity than A-G mill grinding. Primary, coarse grinding (up to 400 mm feed size) Grinding media is grinding feed plus 4-12% ball charge (ball dia.100- 125 mm) High capacity (short retention time) Less sensitive to …

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