How to Control a SAG Grinding Mill Circuit
How to Control a SAG Grinding Mill Circuit circuit and the primary mill must then be run at less than its capacity to keep from overloading the secondary mill. If the critical size is above 13 mm, it will build up in the primary mill circuit filling the primary mill with ore too fine to be effective as grinding media but too coarse to
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MILLING CONTROL & OPTIMISATION
Figures 8 and 9 on the right show results from a gold plant’s SAG mill achieved with MillStar’s Segregated Ore Feed Controller combined with the Power Optimiser: • The standard deviation of the mill feed control is greatly reduced. • The cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.
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SAG Mill Liner Design
End and shell liner design in these mills is much the same as for SAG mills. The effect of liner design on performance is equally as important. For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power consumption reduced by 13 percent by liner redesign alone.
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Dynamic modeling and simulation of a SAG mill for mill
The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size
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PARAMETER OPTIMIZATION OF LARGE SAG MILL LINER BASED ON
Toor targeted the throughput, energy consumption and product size of the SAG mill, optimized the liner structure, and quantified the benefit of using shorter life liners. The results presented indicated that liners with a reduced mass and shorter life outperform their longer life counter parts in all key production parameters of throughput
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Dynamic modeling and simulation of a SAG mill for mill
The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size
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Industrial Grinding Estimation of Blended Ore from
AG/SAG mill feed, trommel screen undersize product (-5.00 +0.00 mm), ball mill discharge and cyclone feed, overflow and underflow have been conducted in order to characterize the particle size distribution in the products and to carry out mass balancing of grinding circuits. Furthermore, an
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Chapter
Autogenous Grinding (SAG) mill in closed circuit with a hydrocyclone package. The gold extraction is done by leaching process using cyanidation method through a series of stirred tanks. In this research, an optimization study of Aghdarreh plant grinding circuit performance was done to lower the product particle size (P
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(PDF) OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS
circuit. The Kinross Paracatu new grinding circ uit consists of one 11.6 x 6.7m (38’ x 22’) SAG mill with. installed po wer of 20MW, followed by two 7.3 x 12.2m (24’ x 40’) ball mills with
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Industrial Grinding Estimation of Blended Ore from
AG/SAG mill feed, trommel screen undersize product (-5.00 +0.00 mm), ball mill discharge and cyclone feed, overflow and underflow have been conducted in order to characterize the particle size distribution in the products and to carry out mass balancing of grinding circuits. Furthermore, an
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Chapter
Autogenous Grinding (SAG) mill in closed circuit with a hydrocyclone package. The gold extraction is done by leaching process using cyanidation method through a series of stirred tanks. In this research, an optimization study of Aghdarreh plant grinding circuit performance was done to lower the product particle size (P
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The appropriateness of the transfer size in AG and SAG
(very low recycle loads) the transfer size is a product of the feedra te, the operation o f the AG/SAG mill and it s geomet ry and not the o ther way arou nd. T o borrow an e xpress ion f rom the
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(PDF) OPTIMIZATION OF THE SAG MILL CIRCUIT AT KINROSS
circuit. The Kinross Paracatu new grinding circ uit consists of one 11.6 x 6.7m (38’ x 22’) SAG mill with. installed po wer of 20MW, followed by two 7.3 x 12.2m (24’ x 40’) ball mills with
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Autogenous grinding mills (AG mills)
Gearless mill drive (GMD) technology has further expanded the use of large AG milling allowing Metso Outotec to produce the world''s largest SAG mill of 42’ in diameter drawing power at 28 MW. Today, Metso Outotec is the world leading supplier of gearless AG mills operating globally.
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FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION
This work is aimed at optimizing the SAG mills feed size distribution as this is an important parameter that affects milling performance after ore competency. A lot of operations have recognized the optimization opportunity that can be taken advantage of by manipulating the feed size distribution to improve SAG milling efficiency.
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Model predictive control of semiautogenous mills (sag
Among the different grinding processes, Autogenous (AG) and Semi-Autogenous (SAG) mills are widely used for ore size reduction. The main difference between these two mills is the use of steel balls as grinding media, typically in the order of 6–12% in volume (Sbarbaro et al., 2005), in the SAG mills.
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Recent International Concentrator Start-ups Do and Don’ts
SAG MILL BALL MILLS MILL DESIGN DATA. These projects involved SAG mills from 26 to 36 ft in diameter, with installed power in the range 9.7 to 16.8 MW using single, twin pinion, and gearless technology for drives over 16 MW. The ball mills used varied from 13.5 to 25 ft in diameter, with installed power in the range 1.85
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FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION
This work is aimed at optimizing the SAG mills feed size distribution as this is an important parameter that affects milling performance after ore competency. A lot of operations have recognized the optimization opportunity that can be taken advantage of by manipulating the feed size distribution to improve SAG milling efficiency.
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SAG Mill Liner Design
End and shell liner design in these mills is much the same as for SAG mills. The effect of liner design on performance is equally as important. For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power consumption reduced by 13 percent by liner redesign alone.
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SAG Mill Grinding Circuit Design
This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge. SAG mills have a higher installed power density for a given plant footprint relative to AC mills. With the combination of finer grind and a lower installed power density (based on the lower density of the mill charge), a typical AG
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AG
Current operational results show that the SAG mill is operating at 5% ball charge level by volume and is delivering a K80 800 micron product as predicted. Power drawn at the pinion is 448 kW, 13.617 kWh/tonne (SAG mill) and 570 kW, 17.325 kWh/tonne (ball mill) when processing 32.9 mtph, for a total of 30.942 kWh/tonne or 14.6% above the
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How to Control a SAG Grinding Mill Circuit
How to Control a SAG Grinding Mill Circuit circuit and the primary mill must then be run at less than its capacity to keep from overloading the secondary mill. If the critical size is above 13 mm, it will build up in the primary mill circuit filling the primary mill with ore too fine to be effective as grinding media but too coarse to
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Model Predictive Control
Different configurations of SAG, ball and rod mill occur but in general a SAG mill can be considered an intermediate stage in breaking down rock from the crushing plant, and feeding to ball or rod mills for further size reduction. Types of mill Different types of mill are in operation e.g. rod or ball mills, so
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SAG Mill Optimization using Model Predictive Control
Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).
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STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR
The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed. The feed in the mill contains fractions of ore that serves as the grinding media. Larger ore fractions break the smaller particles but also breakdown themselves and exit the mill as a product.
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MILLING CONTROL & OPTIMISATION
Figures 8 and 9 on the right show results from a gold plant’s SAG mill achieved with MillStar’s Segregated Ore Feed Controller combined with the Power Optimiser: • The standard deviation of the mill feed control is greatly reduced. • The cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.
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Applying grindcurves to mill operation and optimisation
The operation of AG/SAG mills is sensitive to mill filling, therefore developing grindcurves to relate mill filling to performance indicators such as throughput, power draw, and product size can assist in achieving optimal mill operations. The throughput, power draw, and product size have been shown to peak at different mill filling levels.
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Mill drives: the desire for increased power and the
size in the SAG circuit product. Iterations of these para-meters can be performed in some models (e.g., DJB’s “Reduced Recovery” and “Millpower2000”) to determine the desired motor power and drive rating, the maximum design mill speed, and the maximum design ball charge volume (Barratt, 1989). For single pinion and dual pinion drives
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Coarser Grinding: Economic Benefits and Enabling
by conventional ball mills, this optimization strategy involves maximizing SAG mill fresh feed tonnage while respecting the ability and limitations of the downstream ball mill – classification circuit to produce the desired coarser final product size.
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Throughput optimisation in milling circuits
If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied into a SAG mill power optimisation strategy. SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification
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