The semiautogenous mill is also called SAG mill which is an acronym for semiautogenous grinding. It is similar to an autogenous mill but uses grinding media like a ball mill grinder. It takes material itself as the main grinding media and grinds through their mutual collision. However, some raw materials with a diameter greater than 20mm and ...
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The first one is the Mines Constancia SAG mill of size 36 × ft. The mill is operating at 72% critical speed and 26% mill charge volume. The mill is fitted with trapezoidshaped high and low lifters. The operating power draw was reported to as between and MW.
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SemiAutogenous Mills/ SAG Mills (primary grinding mill) — these mills use grinding balls with forces of attrition, impact, and abrasion between grinding balls and ore particles that result in ...
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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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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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32" x 42" Patterson, Paint Mill, 3' width x 4' L x 42" H overall dimension, 65 gallon capacity, 128 gallon total capacity, 14 psi jacket. Category: Ball, Pebble, Sag Mills, Chemical Proc... Seller: Machinery Equipment Co. Location: Brisbane, CA. Mfr: Patterson. Patterson Steel paint mill, 32" diameter X 42" long, with approx 65 gallon working ...
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SAG mill. SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also 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' () in diameter, powered by a 28 MW (38,000 HP) motor.
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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 and kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 percent of the ...
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SAG mills have a power higher than 10 MW. Even ball mills have a power larger than 10 MW. For this reason, they have an important impact in energy consumption and in the operation of the power distribution system. Figure 1. Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.
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The present study investigates the propensity of predicting ore grindability characteristics and varying pulp densities through acoustic measurements on the Magotteaux ball mill. Specifically, the grinding behaviour of two different mill feeds (model quartz and iron ore) together with solid loadings (50, 57, and 67 wt% solids) were correlated ...
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SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of ...
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The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 510 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol ...
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Ball feed size SAG mill water flow rate SAG mill power vs. wear geometry maximizing kWhr/ton tons/hour in combination SAG mill liner changeout life/cycle vs. tons/kg consumed. Ball mill liner efficiency based on liner geometry and its influence on kWhours/ton, total tons/life cycle, and P80 transfer to cyclones. Ball mill grind is based ...
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Rod mills are similar to ball mills and use metal rods as the grinding media. Pebble mills use rock pebbles as the grinding media to cause friction and attrition between the pebbles and ore material. Pebble mills may be used when metal balls must be avoided. Autogenous grinding (AG) and semiautogenous grinding (SAG) mills use the material to ...
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ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, servicefriendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant. eBook: Grinding ...
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Semiautogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diametertolength ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ballmilling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These
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enter a ball mill. Indeed, if a SAG mill discharge screen or trommel has mm square openings, the top size of material moving forward to the ball mill will be 12 mm and the P 80 of the SAG mill discharge will be in the order of 4 to 6 mm, based on a normal relationship of screen opening to product size. According to Bond's ball mill
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The use of VSDs makes it very easy to set the mill speed by just modifying this value on a touchscreen. But this is not only an option for new installations. In installations where SAG and Ball mills have been working for several years at fixed speed, but the speed regulation has been observed to be necessary VSDs can also be integrated very ...
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The concentrator comminution circuit has a configuration that includes a single SAG mill with dimensions of m × m, followed by two ball mills in parallel (secondary grinding). Additionally, the pebble produced by the mill is returned to the SAG mill.
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The final plan was to increase the ball charge in the SAG and ball mill to 10% v / v and 27% v / v, respectively; set the upper limit of the operating power in the ball mill to 5800 kW; use a TC Series crusher (without a power/feed ratecontrolling device, but with a feed bin) to crush pebbles for recirculation back to the SAG mill feed ...
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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, kWh/tonne (SAG mill) and 570 kW, kWh/tonne (ball mill) when processing mtph, for a total of kWh/tonne or % above the ...
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Assuming your ore is AGamenable: 7 TPH to 15 TPH is a comfortably production average for a 13′ x ′ AG Mill. A 13′ x 6′ SAG Mill has a reasonable range of: 20 to 30 TPH for gold ore SAG Ball Mill duty. 25 to 40 t/h for copper porphyry SAG Ball Mill duty. In Single Stage SAG duty, the approximate capacity reduces to only 8 to 13 ...
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Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10 mesh ( mm) ensuring that the ball mill will work efficiently.
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Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ball mills. In the case of SAG mills, this requires two separate filling measurements: one for a crashstop and one following a complete grindout to quantify ...
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SAG Mill and Ball Mill Case Study By Ingeteam. In September 2011, the company Outotec, located in Espoo (Finland), awarded Ingeteam a contract for the design and supply of the main drive equipment for a SAG mill and a ball mill to be installed in Russia. Outotec is a global leading company that designs and delivers turnkey projects ...
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In general, the SAG mill manufacturers will control the addition amount of medium such as steel ball at 28%, so that the capacity of semi SAG mill to process materials can be increased by 1030%. The SAG mill liners wear will increase by 15% due to the impact of medium such as steel ball during the SAG mill operation.
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