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The degree of slow- tant component of grate discharge mills (GDM). The back depends on the size and design of the pulp lifters. GDM include autogenous (ag), semiautogenous (sag) The ideal slurry flow in a typical grate discharge mill is and grate discharge ball mills.
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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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design processing rates of the Cadia Hill SAG mill circuit and that could be easily manipulated were; SAG Mill Load Ball Charge - SAG mill power draw was guaranteed by the vendor at 13% ball charge and 30% total volume to be 20.96MW for the 40 foot diameter SAG mill. In practice this power draw was never achieved I-14 (Dunne et al 2001).
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Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
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Sag Mill Grate Design schickimicki-leipzig.de. Sag Mill Grate Slot Size Increased production and energy efficiency for optimized conditions such as different blast designs, primary crusher setting, sag mill grate design, sag mill ball charge level, ball mill operating conditions, changes in classification with hydrocyclones, use and operation of recyclepebble crushers were all …
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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 rubber grates have tapered slots to minimize the plugging with near size particles. Rubber / PolyStl™ grates are extensively used in AG / SAG and Primary ball mills. Polycorp regularly supplies rubber and PolyStl™ grates for mills up to 40 ft in diameter. PolyStl™ Grates. PolyStl™ Grates are suitable for AG / SAG mill applications ...
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Thus, the size of the slots may be varied depending on the requirements for the SAG mill, with very small slots e.g. narrower than ¼ inch, being prone to plugging during use. Slot widths can vary from ¼ inch to a maximum of 4 inches, depending on the application and the diameter of the cylindrical grinding chamber being used.
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW
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grate slot size could not solely control the mill product size ... an increase in ore hardness corresponds to an increase in feed size. Hard ore grinding in the SAG mill resulted in finer products ...
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A real-time monitoring system to monitor the wearing in the thickness of the ribs ( 5 ) of a grate ( 1 ) of a SAG mill ( 9 ) due to the abrasive action of the ore pulp residing inside the mill and due to the action of the grinding elements during the operation, and which in certain cases also generates obstruction of the slots ( 4 ) due to the jamming of said grinding elements inside the …
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PT Freeport Indonesia, and others with 11.6-m mills) have installed SAG mills of 20 MW. Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having been designed. Several circuits have …
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SB-200DD. ERIEZ ® Our full line, from simple tubes . to fully automated tramp metal removal designs. Grate. Magnets. TUBE MAGNETS • P-GRATE • BA GRATE • WING/DRAWER GRATES • GRATE-IN-HOUSINGS • ROTA-GRATE
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M33x120mm 45 Steel 8.8 Level Standard Size Forging Process Elliptical Head Bolts Nuts and Washers EB696. ... ANSI SAG Ball Mill Grate Rubber Liner Plate,Shell and End Liner. Mn18Cr2 SAG Mill Liners,High Manganese Steel AG/SAG Mill Liners,SAG Mill Liner for Copper Mine.
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Our grates are made of our special H79 high-strength steel which is tougher and harder than commonly used chrome-moly steels. Our grates made of H79 experience very little slot peening so mill throughput is not compromised. Proven high volume vendor Columbia Steel can provide all the castings required for a complete grinding mill reline.
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of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in order to advance the understanding in a meaningful way, a more mechanistic ...
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LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
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estimated utilising the SAG mill grate size and discharge screen aperture sizes and the Rosin-Rammler size distribution function, which has been selected for its convenience and since it "has been found to fit many size distributions very well" (Napier-Munn et al.,1996).
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Trommel's Dimension Slot Size ... • Trommel of 40 feet SAG mill of Collahuasi has an high value of α = 172 m 3/h/m 2. Open Pulp Free Flow by Free SAG 1011 Area, % Flow, ... • Size of SAG Grate: 64 mm • Strangulation of 182 mm • Strangulation of 188 mm • Opposing directors
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Thus, the size of the slots may be varied depending on the requirements for the SAG mill, with very small slots e.g. narrower than ¼ inch, being prone to plugging during use. Slot widths can vary from ¼ inch to a maximum of 4 inches, depending on the application and the diameter of the cylindrical grinding chamber being used.
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• 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB's GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful ...
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Curb opening inlets are useful in sag and on-grade situations because of their self-cleansing abilities and hydraulic efficiency. ... Slotted drains consist of a corrugated pipe with an extended slot, or throat, at the top (see Figure 10-5). ..., an appropriate safety factor should be applied to the inlet size. For grate inlets in sags, the ...
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Heavy-duty grate plate designs are available for larger mills with a range of aperture sizes. The elastic property of rubber allows for smaller slots than steel grates whilst eliminating blinding problems. Internal frames are designed for different mill loads and semi-overflow designs control the pulp level in the mill.
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The SAG mill is 26' diameter x Proceedings of the 39thAnnual Canadian Mineral Processors Conference – 2007 206 12'3" EGL and powered by 4,500 HP motor driven by a variable speed LCI drive that can control the mill speed from 36% to 80% of critical speed. The general flowsheet of the circuit is shown in Figure 9.
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An increase in slot size and operational stability has increased throughput by 7 %. Pebble production increased by 24 % during the first 50 days of operation, while the wear rate decreased from 0.26 mm/day to 0.11 mm/day. Mill availability has increased thanks to the elimination of pinning and breakage.
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grate slots, they get an equal chance to go back into the mill as illustrated in discrete element method (DEM) simulation of 36 ft SAG mill pulp lifters shown in Figure 5. Solid particles and coarse pebbles also flow-back through the grates along …
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The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. SAG mill product feeds two parallel ball mills of 6.6 m×11.1 m (internal diameter×length), each with a 9.7 MW twin pinion drive. The ball mills are operated at a ball charge volume of 30–32% and 78.5% critical speed.
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The load in such a mill typically contains 250,000–450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.
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Choosing the right conical mill screen for your application is crucial in achieving your desired particle size range and enhancing the performance of the mill. There is a choice of Round Hole, Grater Hole, Square Hole, Slotted Hole and Diffusion Bonded mill screens. Read our guide on choosing the correct screen.
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What is the difference between a SAG mill and ball mill? SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9] Attrition between grinding balls and ore . Read More
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Slot size is designed as per the feed material characteristics and to ensure optimum air flow through the diaphragm ... Moreover the number of bolts is reduced to minimum The replacement of any grate or back plate is independent of other plates or adjacent shell liners The wear pattern is considered while designing the plates ... AG_SAG_Mills ...
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A single size category, typically 80% passing, is used in order to simplify the equations. ... and optimizing SAG mill discharge grates and pulp discharge lifter systems. ... that operators have ...
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The Copper Mountain SAG mill is 10363 mm [34 feet] in diameter and 6096 mm [20 feet] long. It is a grate discharge mill with an inside diameter of 10363 mm [34 feet] and a grinding length of 5334 mm [17.5 feet]. The mill is driven by two 8,500 horsepower ABB motors. Figure 2 - …
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The discharge grates of the SAG mill were identified as a key component in the SABC circuit, ... with a 25 mm grate slot width, ... of the …
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Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
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In cases such as autogenous mills at the Empire Mine, all the pulp discharges through ports, approximately 3″ square, with no slots in the "grates." …
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