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SAG/AG SCU SAG/AG Sentinel Camera Unit (SCU) Concept of System The SCU uses the latest technology in high-definition imagery within a custom designed housing permanently affixed to the feed chute to provide a live audio and temperature feed in a running SAG mill and video feed from inside a stationary SAG mill This enables remote monitoring of the condition of the shell and discharge liners

DEM SIMULATION OF MILL CHARGE IN 3D VIA GPU COMPUTING *R K Rajamani1 and S Callahan2 3 Discrete Element Method simulation of charge motion in ball SAG and autogenous mills has become a standard for lifter design power draft evaluation etc Both two-dimensional and three-dimensional codes are being used The two-dimensional code dominates the user market since the

Maintaining an optimum charge in a SAG mill remains one of the fundamentals for efficient mill processing If the charge level or the ball to charge ratio is incorrect breaking liners and/or increasing power consumption is inevitable and can only result in degraded mill efficiency To minimize reline time it is critical to set the charge height at an optimum level Setting the charge level

2 AG mill + a recycle crusher Competent ore - relatively homogenous (the recycle crusher is used to balance the rate of impact breakage within the circuit) 3 SAG mill (8 – 15% ball charge) Variable competency ore 4 High ball charge SAG mill (15 to 25% ball charge) Incompetent ore 5 Low ball charge SAG mill high mill speed

5 Low ball charge high speed SAG mill (4% ball charge 90% Nc) A cross between AG and SAG for average competency abrasive ores Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground) Kloof Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores better suited to coarse grind sizes High aspect

This mill is capable of grinding lumps whose size is tens of millimeters into a product tens of microns or even several microns The ball mill can grind various ores and other materials with dry type and wet type There are two kinds of ball mill grate type and overfall type due to different ways of discharging material

Currently limited on-line information about mill charge motion and content is available to mill operations for control purposes leading to periods of lower throughput instability variable product size and accelerated mill liner and lifter wear In response to this need CSIRO has developed an on-line surface vibration monitor for primary grinding mills which produces data that has been

Choosing a SAG Mill To Achieve Design Performance John Starkey1 Principal Consulting Engineer Sami Hindstrom2 Manager Grinding Travis Orser2 Project Manager Grinding 1 Starkey Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd E Oakville Ontario L6J 7S4 PH (905) 465-7512 Fax (905) 844-5297 E-mail john starkeysagdesign 2 Outokumpu Technology

the SAG mill critical speed Pc = SAG mill power consumption (kW) % 600 +100 = % of the fresh feed in the size range 152 +25 mm M Silva A Casali/Minerals Engineering 70 (2015) 156–161 157 In fact the later can be modelled as a function of the others

Maintaining an optimum charge in a SAG mill remains one of the fundamentals for efficient mill processing If the charge level or the ball to charge ratio is incorrect breaking liners and/or increasing power consumption is inevitable and can only result in degraded mill efficiency To minimize reline time it is critical to set the charge height at an optimum level Setting the charge level

The future of SAG mills Posted by John on 31st July 2017 Are SAG Mills Losing Market Confidence? ask P Staples G Lane R Braun B Foggiatto and M P Bueno in this paper (now available through CEEC International) presented at the Sixth International Conference on Semiautogenous and High Pressure Grinding Technology Vancouver 20-24 September 2015 AG and SAG grinding mills are considered

SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance i e the impact of shell liners on the grinding action and of grates

SAG Mills (17) Roller Mills (10) Vertical Mills (5) Miscellaneous Grinding Mills (3) Ancillary Equipment (7) Grinding Media (2) Spare Parts Accessories (33) Style Show all Ball Mill (61) Batch Mill (13) Bowl Mill (2) Conical Mill (5) Gears (11) Jar Rolls (2) Liners (5) Rod Mill (9) Roller Mill (8) Shell Heads (2) Szegvari Attritor (1) Other (2) Miscellaneous Parts (14) Manufacturer

The throughput and efficiency of a SAG mill depends on the volumetric load An overloaded mill has reduced coarse ore breakage as the cascading balls and rock cannot drop far enough reducing kinetic energy for breakage An underloaded mill will break coarse ore well but at the expense of added grinding ball consumption and increased risk of liner damage Also if underloaded significant throughput will

On average expect a 3-6% increase in SAG mill throughput over an operator/DCS system PlantVision™ visually monitors the feed and relays critical information about the properties of and changes in the incoming ore MillScanner™ will skillfully listen to the mill to

Improved Relationships for Discharge in SAG/AG Mills Daniel Mitchell B Eng (Hons) (QLD) A thesis submitted for the degree of Master of Philosophy at The University of Queensland in 2015 Sustainable Minerals Institute (SMI) Julius Kruttschnitt Mineral Research Centre (JKMRC) Page i Abstract Comminution is an essential component of mineral processing operations and its proper operation and

5 Low ball charge high speed SAG mill (4% ball charge 90% Nc) A cross between AG and SAG for average competency abrasive ores Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground) Kloof Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores better suited to coarse grind sizes High aspect