A total of 120 t of Cristalino ore was prepared and sent to CIMM, where it was crushed and screened prior to grinding tests. The processing equipment included a m (8′) diameter by m (2′) length AG/SAG mill equipped with a 20 kW motor, a cone crusher, a m (3′) diameter by m (4′) length ball mill equipped with a 15 kW ...
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SAG mills are the main workhorses in the majority of comminution circuits globally. They need to be fed and kept working round the clock. ... analyse incoming information from LoadIQ as well as ore properties and internal mill dynamics together with board power usage, mill weight and bearing pressure. It can then automatically take corrective ...
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However, when combined with an accurate SAG mill powerdraw model, total charge volume and ball load can be estimated with reasonable accuracy. ... Mill Weight (t) Mill Power (kW / 10) Mill Speed ...
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% solids by weight of discharge slurry 0 77 0 78 . It should also be remembered that power draws indicated in the control room of a concentrator may not ... 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
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This variation comes generally at a sacrifice in motor efficiency because the reduced power demand from the mill is lost in the speed control circuit. As mentioned above if the power is approximately 6000 horsepower or less a single pinion can be used, allowing the use of a synchronous motor and air clutch for low inrush applications.
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Conditions Affecting BallMill Power. Power depends principally upon the weight of ball charge, an approximate figure being 9 to 10 hp. per ton. However, the power per ton of balls will vary according to the percentage of volume the ball charge occupies in the mill. An approximate curve from data at hand is given in Fig. 6, from which it will ...
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Inferential measurements of SAG mill discharge and feed streams and mill rock and ball charge levels, detailed earlier in the series, are utilised in a simulation environment. A multivariable ...
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Thus the power to drive the whole mill. = + = = 86 kW. From the published data, the measured power to the motor terminals is 103 kW, and so the power demand of 86 kW by the mill leads to a combined efficiency of motor and transmission of 83%, which is reasonable.
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m length (190) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two m (120) by m (240) horizontal screens, whose combined oversize (pebbles) is diverted to two Metso MP 800 cone crushers. The crushed product returns to the SAG mill feed, closing the primary grinding circuit. The horizontal screen ...
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Abstract and Figures. Semiautogenous (SAG) mill total load and ball load have a marked influence on mill performance. Direct measurement of these inventories is difficult, hence inferential ...
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Mill Weight Power Top Size Figure 4: Feed Top Size vs. SAG Mill Performance 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000 13:00 14:00 15:00 16:00 17:00 kW Top size (mm) Top Size Power Mill Weight Figure 5: Feed Top Size vs. AG Mill Performance This is not say that ag mill performance ...
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the fill level ratio, and the steel ball ratio on the SAG mill. Finally, through statistics and analysis of particle information and mill power under di erent conditions, we analyzed the influence of three parameters on the particle fracture e ect in the SAG mill and obtained the best operating parameters of the SAG mill. 2.
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was surprising that the Bond Rod Mill Wi average was kWh/t. Since the ore is unusually soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services, Inc. Table 4: Summary of 6 JKTech Drop Weight Tests
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The AdaBoost algorithm begins by training a decision tree in which each observation is assigned a weight equal to ... A Mill Power Equation for SAG Mills. Min. Metall. Explor. 1990, 7, 5763. [Google Scholar] Moys, A Model of Mill Power as Affected by Mill Speed, Load Volume, and Liner Design. J.
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Highlights Abstract Keywords SAG milling Power modelling Especific energy modelling SAG mills operation data 1. Introduction Comminution, especially milling, is the most important operation in mineral processing, both for its relevance to the downstream processes as well as for the high costs associated with the energy consumption.
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Bond rod mill work index (Wi RM) SAG Grindability index (SGI) or SAG Power index (SPI™) Drop weight test, both JK and SMC (A×b, DWI, Mia, etc) Bond rod mill work index versus A×b Only considering rod mill work index tests performed in laboratory mills equipped with wave liners. This is the standard specified by F. Bond and is typical of ...
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Ball mill： Ball mills are the most widely used one. Rod mill： The rod mill has the highest efficiency when the feed size is . 30mm and the discharge size is about 3mm with uniform particle size and light overcrushing phenomenon. SAG mill: When the weight of the SAG mill is more than 75%, the output is high and the energy consumption is low ...
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The working principle of the selfgrinding machine is basically the same as the ball mill, the biggest difference is that the sag grinding machine uses the crushed material inside the cylinder as the grinding medium, the material constantly impacts and grinding to gradually pulverize.
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where m p is in kW; D is internal mill diameter (meters), L is internal mill length (meters); J is total fractional charge loading of the mill; J B is the fractional mill filling by balls; ε B is the effective porosity of the charge, taken as ; ρ s and ρ b are true densities of rock and balls (tons per cubic meter), respectively; w c is the weight fraction of rock in water and rock in ...
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The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to m. Product: 300mm (for transport) to 200mm (for SAG mill) Feed Rate:
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2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the minetomill (M2M) paradigm, a practice that has generated the capacity to analytically assess aspects of mining and ...
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SAG mills use a combination of steel balls and rock particles as grinding media, while AG mills use only the ore itself. Both types of mills are used for grinding ore in mineral processing operations, but SAG mills are larger in size and can grind larger quantities of ore.
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The standard JK drop weight test breaks single particles at five size fractions each at different energy levels by dropping a given weight from a certain height. ... and in feed size distributions caused the SAG mill throughput to fluctuate between 700 and 3000 t/h ... (Ecs) and breakage intensity (t 10 %) is described as a powerlaw ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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