445 PAPER 28 Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1, Chief Engineer Guy Comeau2, Senior Metallurgist Colin Hardie3, Former Chief Metallurgist 1 Process Control Group, Xstrata Process Support 6 Edison Rd, Falconbridge, Ontario

distributions (based on SAG mill grate size and discharge screen aperture size), see Equations (1) to (4). .. weight residuals given mill power draw or weight process measurements as inputs. . SAG mill total feed (SMTF) is calculated by mill model inversion. .. AG and SAG Mill .

inches to draw large quantity of pebbles. The inherent transportation problems associated with SAG mills in closed circuit with pebble fraction are more complicated than the single stage SAG mill operation, because the coarse pebbles behave significantly different to that of slurry in pulp lifters.

445 PAPER 28 Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1, Chief Engineer Guy Comeau2, Senior Metallurgist Colin Hardie3, Former Chief Metallurgist 1 Process Control Group, Xstrata Process Support 6 Edison Rd, Falconbridge, Ontario

(slurry pool) is predicted from mill design and slurry flow data and its impact on power draw is then predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge

Outotec® Grinding technologies With over 100 years experience in grinding technology, Outotec is one of the largest mill suppliers in the world. Outotec's dedicated team of grinding specialists provide design engineering, testing and analysis in order to select the mill best suited to .

sag mill pebble crusher - platformlrwageningen.nl. Choosing a SAG Mill to Achieve Design . SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates.

inches to draw large quantity of pebbles. The inherent transportation problems associated with SAG mills in closed circuit with pebble fraction are more complicated than the single stage SAG mill operation, because the coarse pebbles behave significantly different to that of slurry in pulp lifters.

Power draw of wet tumbling mills and its realtionship to charge dynamics Part 2 an empirical approach to modelling of mill power draw. Tran Inst. Min. Met Vol 105: C54-62. 20. MORRELL, S. (1996). Power draw of wet tumbling mills and its relationship to charge dynamics. Part 1 a continuum approach to mathematical modelling of mill power draw.

What is more, stabilizing the load in the mill also stabilizes power draw. This enables the operator to manage power usage, eliminat - ing the energy waste that comes with a varia - tion in the power draw. The challenge: To control your SAG mill so that it runs at peak efficiency

Flow Sheet & Symbols For Ball Mills. symbol for cone crusher sign flow diagram – Gold Ore Crusher . General arrangement drawing of the mill incl. internal parts Process flow sheet Remarks: A TEC Kasernstrasse 16-18 . the optimum flow sheet will contain a SAG mill and somewhere near the same . 15,000 HP ball mills-72,000 tons per .

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore . stability associated with the constant power draw and fine media in the ball mill. Lack of grinding media in . The SAG mill model in the JKSimMet software has not been shown to accurately .

The actual SAG mill power draw is 230-370 kW lower. Mill runs 1 rpm lesser in speed on the average. The re-circulation to the cone crusher is reduced by 1-10%, which means more efficient grinding of critical size material is taking place in the mill.

MILLING CONTROL & OPTIMISATION MillSTAR. . • Frequent belt trips due to limits on power draw of belt feeders. The Mill Feed Controller was combined with Mintek's safety controllers . Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved .

SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but 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%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

TECHNICAL NOTES 8 GRINDING R. P. King. 8-2 . thicker and thicker as the speed increases until the entire charge is centrifuging and the net power draw is zero. The effect of mill charge is primarily through the shifting of the center of gravity and the mass of the charge. . LG A mill power equation for SAG mills. Minerals and Metallurgical .

A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting installation. Five and one quarter inch steel grinding balls - cannon balls - occupy 8% of the mill volume and are consumed in the grinding action at the rate of 600,000 pounds per month.

The actual SAG mill power draw is 230-370 kW lower. Mill runs 1 rpm lesser in speed on the average. The re-circulation to the cone crusher is reduced by 1-10%, which means more efficient grinding of critical size material is taking place in the mill.

operating at 90% of its maximum power. The combined power draw of the SAG mill and ball mill was 8658 kW, which caused partial over-grinding. From experience in processing plants outside of China, the power rating of the ball mill should be higher than that of the SAG mill [5]. The pebble crusher had an over-powered conﬁguration.

ball sag mill dimensions cemtec top drawings cuw . Cement Sag Mill Dimension sag mill drawing CEMTEC, drawing ball mill, Grinding Mills FL renowned SAG and Ball . Read More; foundation drawings for sag mill kss . Foundation Drawings For Sag Mill scope provide FL a solid foundation, leading supplier of grinding mills, operating today .

Apr 03, 2018 · The slurry level in AG/SAG and ball mills has an .fred bond ball mill power draw equations - farwestgreat fred bond ball mill power draw equations_fred bond ball mill power draw equations .

SAG mills • Determination of your SAG mill's power draw characteristics. • SAG Mill Steel Charge Estimation tool provides an estimate of the percent steel in the charge of your SAG mill based on the power draw and the total charge volume. • Ball impact energy chart to determine the impact energy of balls as a function of mill diameters.

The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG specific energy using Equation

Advanced Simulation for Semi-Autogenous Mill S ystems: A Simplified Models Approach 147 description it is necessary to consider the relationship between the feed stream and mill charge level. This relationship is known as the transport rate and is probably the least developed aspect in models proposed so far (Apelt et al., 2002 a,b).

MILLING CONTROL & OPTIMISATION MillSTAR. . • Frequent belt trips due to limits on power draw of belt feeders. The Mill Feed Controller was combined with Mintek's safety controllers . Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved .

Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure. The solution automatically controls ore master feed rate and water addition to increase throughput, while keeping mill load within .

sag mill drawing agemo.be. sag mill drawing. SUAMG Machinery is professional mineral processing equipment manufacturer in the world, not our equipment has the excellent quality, but also our product service is very thorough. more+ . BrainWave: Control solutions for SAG mills ANDRITZ.

SAG mill energy required according to this statement, is 2.5 times more than the Ab value to produce the same degree of particle breakage. There is a speci ﬁ c gravity factor that affects AG/SAG power draw. The lighter material, in the 2.5 speciﬁ c gravity (SG) range, .

sag mill drawing agemo.be. sag mill drawing. SUAMG Machinery is professional mineral processing equipment manufacturer in the world, not our equipment has the excellent quality, but also our product service is very thorough. more+ . BrainWave: Control solutions for SAG mills ANDRITZ.

What is more, stabilizing the load in the mill also stabilizes power draw. This enables the operator to manage power usage, eliminat - ing the energy waste that comes with a varia - tion in the power draw. The challenge: To control your SAG mill so that it runs at peak efficiency

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