In a largescale operation, feed ores are introduced into the AG/SAG mill in a continuous mode at a given flow rate to replace the discharging slurry. Nonetheless, the variations in the feed characteristics, typically hardness and size distribution, could cause sudden disruption to the mill operation. This would be challenging to detect in practice, owing to the hostile environment of the mill ...
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Semiautogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational variables. Experts recognize their capabilities to provide adequate ...
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Session 16: SAG PreCrushing Increasing SAG Mill Capacity at the Copper Mountain Mine through the Addition of a PreCrushing Circuit Mike Westendorf Improved SAG Mill Circuit Performance due to Partial Crushing of the Feed at Tarkwa Gold Mine Aubrey NjemaMainza Full Precrush to SAG Mills the Case for Changing this Practice MalcolmPowell
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Product Size: All passing 6 mesh with 80% passing 20 mesh. Net power from pilot plant: KWH/ST. Mill, gear and pinion friction multiplier: Mill Power required at pinionshaft = (240 x x ) ÷ = 5440 Hp. Speed reducer efficiency: 98%. 5440 Hp ÷ = 5550 HP (required minimum motor output power).
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SAG Mill Crushability The comminution dataset consisted of57 drill core composites representing material from production periods across the life of mine. This data showed a wide range in both crushability (=impact resistance) and grindability. • Impact resistance as measured by the JK parameter A*b ranged from a very hard 25 to a soft 118,
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The various options available for larrsepower semiautogenous grinding (SAG) mill drive systems are examined, together with their impacts on mill design and relative capital and operational costs. A brief history of largemill drive systems is given. Stateoftheart mill design and mechanical design considerations are also discussed. A design for fixedspeed or variablespeed operation is ...
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performing SAG mill. It is possible in some cases to modify a SAG circuit to force it to perform better, but this often takes time, much effort and costly modifications. In most cases the capital spent on a properly sized SAG mill may prevent production losses that would be many times greater over the extended start up period.
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2006 DEPARTMENT OF MINING ENGINEERING This paper addresses two major issues: the influence that the lifter profile has on the charge behaviour within an industrial mill and the development of a structured methodology to evolve lifter profiles within the framework of the DEM. UNIVERSITY OF BRITISH COLUMBIA
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The SAG test reproduces commercial SAG mill grinding conditions on L of ergy to grind ore from 80% passing 152 mm to 80% passing mm (WSDT), mill product is then crushed to passing mm and is subjected to the t to provide the total pinion energy at the specified grind size for mill design.
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can improve and optimise SAG mill grinding performances via realtime monitoring technology [15]. In addition, the measurement of vibrationacoustic emission signals has emerged as a promising tool to understand the state of the mill (AG/SAG mill and ball mills) [1628]. Notwithstanding, more accurate and precise prediction is a topical subject
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services to drive your mill's performance Introducing a new name Outotec is proud to announce the launch of our new rebranded offer: Outotec Gears and Pinions. You ... • AG and SAG mills • Ball and FGD mills •Pebble and rod mills • Multicompartment mills • Rotary kilns and dryers • Mixers and other equipment
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state of the medium and its grinding performance on the SAG mill [3, 4]. Hlungwani used the DEM to study the effect of the number and the shape of liners on the power consumption of the SAG mill, and predicted that the trapezoidal lifters draw more power than the square lifters at the normal operating speed of production mills [5]. J. T.
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Initial indications are that the mill motor size recommended is higher than that supplied by the manufacturer though this probably reflects the less accurate estimate of the mill data base with only a limited number of variables considered. Rod Mill Design A different approach is taken with the rod mill design where equations by Bond and
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Plant Concept SAG Circuit HPGR Circuit Equipment 1 x SAG Mill MW 1 x Secondary Crusher 750 kW 1 x Pebble crusher 450 kW 1 x HPGR MW 2 x Ball Mills MW each 2 x Ball Mills MW each Screens and conveyors MW Screens and Conveyors MW Total drive capacity installed MW MW
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Based on experience, millliner designs have moved toward more openshell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebblecrushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of :1 and :1.
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Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pinions, MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used MPa (6000 hp) motors to drive a 1Imdiam x long (36ftdiam x 15 ft) autogenous mill. However, recent SAG mill designs now ...
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To predict the power of the SAG mill, Hoseinian et al. proposed an analytical model based on gene expression programming. To develop their model, they employed several tests by varying the SAG mill parameters such as the moisture of charge, mass flow rate, cell weight of mill load, solid percentage and inlet and outlet water to the SAG mill.
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Analysis of typical SAG mill installations in the copper industry indicates that typically less than 90% of installed motor power is used on average. Therefore, the installed SAG motor power was determined to be kWh/t (/90%). Checks were carried out to ensure that the SAG mill could utilise this power within a reasonable envelope of ...
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I221 EFFECT OF SAG MILL FILLING AND SPEED In this work, the South Deep SAG mill was stabilised at a range of fillings varying between 20% and 45% of total mill volume.
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Decisionmaking on selection of SAG mills increasingly uses the methods of sizing the milling power based on laboratory tests on grindability of minerals. This article considers one of such methods allowing determination of mill characteristics based on the Bond work indexes of crushing, rod milling and ball milling.
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(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia Villanueva, 2013 [1]).
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