In this study, the relationship between the optimal speed and the size and number of particles in the SAG mill was mainly investigated based on discrete element method. For optimal speed control, an improved sliding mode control of the exponential approaching law is proposed to improve the stability and rapidity of sliding mode control near the
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optimization of sag mill circuit · optimized the oper ating strategies for the SAG mill circuit at Paracatu op eration in Bra zil. The focus of this project was to reach design t hroughput and final grinding product size, conditions . Mar 21, 2007· The optimal performance of AG/SAG mills is the key to successful plant operation.
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operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m (34 ft) and above, with the largest being 12.2 m (40 ft) in
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EF5BM=[ P80+10.3 1.145×P80] ( 3 ) The EF4 formula requires both the rod mill and ball mill work index (rod mill Wi is used to calculate the optimal feed size) and because this is a “single-stage ball mill” calculation, the F80 is actually the rod mill feed size (10,000 µm) from Table 1 and the P80 is the ball mill circuit product. The EF5 factor only applies below 75 µm to ball
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mill with a 30 mm graded ball charge and a 30% filling degree. The mill discharge pulp density was increased from 68.8% to 75.9% solids. The data is summarized in Table III. The example in Table III illustrates that the density has a large influence on the grinding efficiency. In this case, the optimum %
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According to available literature, the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85% of the critical speed. SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed.
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decided to make SAG control one of its priorities in order to further increase throughput and improve stability. The original primary mill control logic delivered by the Optimisation Project in 2005 consisted of a simple PID loop controlling the mill charge (bearing pressure) through feed rate changes.
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Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
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optimization of sag mill circuit · optimized the oper ating strategies for the SAG mill circuit at Paracatu op eration in Bra zil. The focus of this project was to reach design t hroughput and final grinding product size, conditions . Mar 21, 2007· The optimal performance of AG/SAG mills is the key to successful plant operation.
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mill discharge product size in relation to the lifting effect of the liners. In this specific case, it is obvious that a certain load expansion is needed to allow the coarse particles entering the media charge to be reduced. Therefore, at this stage, a direct measurement of the dynamics in the mill gives very valuable information to the operator.
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s
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The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill’s
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size to balance the distribution of power output between primary and secondary grinding, will have been based on mill speed and shell liner/lifter simulations and, particularly, ball charge volume and ball top size, both of which are dependent upon the contingency applied to the transfer size in the SAG circuit product. Iterations of these para
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The optimal performance of AG/SAG mills is the key to successful plant operation. All AG/SAG mills using radial or curved pulp lifters suffer from inherent material transport problems such as slurry and pebble pooling, which decrease throughput and increase energy consumption.
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optimization of sag mill circuit · optimized the oper ating strategies for the SAG mill circuit at Paracatu op eration in Bra zil. The focus of this project was to reach design t hroughput and final grinding product size, conditions . Mar 21, 2007· The optimal performance of AG/SAG mills is the key to successful plant operation.
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just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput, or when the circuit is SAG mill limited, achieve the finest grind size possible, thus increasing mineral liberation and recovery. GrindingExpert™ has been shown to typically increase throughput by
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The AutoCharge system is primarily suitable for SAG mill balls (100–150 mm). As each ball rolls through the counting chute, an electro-mechanical limit switch is activated, signalling the counter. Each count is added to the last, allowing a continual increasing total count of balls to enter the mill over a set time period.
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SIZE: SAG milling grinding media are available in sizes from 4.0” to 6.5” or The theoretical apparent packing density of the balls in a ball charge is 282 lbs/cu-ft or 4,520 kg/m3. Spec Sheet Download tension, and optimal head seating are critical components to reduce mill shut down risk. Our product line includes: Oval head liner
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Optimisation of the Cadia Hill SAG mill circuit PDF Download . Oct 21 2015 SAG Mill I12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifiions and Ø Circuit Design Considerations The effect was consistent with 70mm 90mm and 80mm grate apertures no matter what the theoretical 39open area shell liner life mill load operating Oct 21 2015 SAG Mill I12 Ø
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to the SAG mill feed conveyor. A 736 Allis Chalmers pebble crusher (110 kW) performed this duty. A Process Flow Diagram is presented in Figure 2. The 8.53 m Ø x 3.92 m EGL (28 x 12.8-ft) SAG mill is fitted with two 1850 kW motors. An operating ball charge in the range of 4 to 10% is used. The mill currently operates at a fixed speed
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is derived from the power required to maintain mill revolutions with the mass of charge acting at the centroid of the mass. This is a form of equation used by many Optimum Feed Size for ball mills F Wb =4 000 13,* MILLCALCv2a 7 19/02/2004. size and power relationships For SAG mills the equation becomes Power=
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Depending on the mill size the SAG mills draws between 2 MW and 17 MW. The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
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Optimal mill loading ensures you are making the most efficient use of your grinding mill – but in the past, it has been difficult to calculate the optimal mill load with precision. Not anymore. LoadIQ utilises our mill scanner smart sensor technology to determine the optimum mill load, increasing throughput by 3 – 6%. What we offer.
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respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W, 2001). 2.2. EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative effect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves.
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The original SAG mill control loop, a mill motor power draw set point of 5200 Amperes controlling the coarse ore feeder speeds, was soon found to give excessive variation in the mill ore charge volume and somewhat less than optimal power draw.
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The analysis of the influence of ball sizes in SAG grinding hasn''t been developed in detail by considering the effect on process parameters inside the mill, grinding efficiency or internal classification. Historically a conventional grinding reference has been made on the empirical procedure developed by Azzaroni (1980).
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the conditions of the liners, grinding ball percentage, and overall charge level inside the SAG mill without the need to pull the feed chute, presents a huge opportunity for improving mill availability, comminution mill is nonoperational. The least optimum method of monitoring liner wear involves waiting until the liner bolt heads wear
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In semi-autogenous grinding (SAG), the grinding mill inventory, (i.e. volume of total charge, volume of ball charge, etc.) is important in determining the optimum operating condition for maximum production (tph), minimum specific energy (kwh/t) or lowest cost ($/t). A two-dimensional graphical method is presented for determining the actual ball charge within the total charge when parameters
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The Simple SAG Mill is a machine added by Ender IO. It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts. The Simple SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Similar to Ender IO''s other Simple machines, capacitors cannot be used in the Simple SAG Mill, so its
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