WEBJun 1, 2006 · The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter. This process develops complex flow behaviour in the region of the ...
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WEBSep 1, 2001 · The following table summarises the cost of operating the 40 foot. diameter SAG circuit at Cadia. SAG mill power consumption averages. /t and the recycle crushers /t. Ball consumption ...
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WEBJan 1, 2011 · A simplified form of the model was used to predict the performance of an 8 m diameter SAG mill with LID = grinding a copper ore, and predicted maximum capacity and minimum kWh/ton at about ...
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WEBgrate discharge for ball mill chicshocozahow does a grate discharge mill work green toolingeu. How a Grate Discharge Ball Mill Works Here I try to explain how ground slurry is discharged from a grate ball mill or SAG How it works is the slurry flows across the grate as it would a screen panel On the other side of the grate/screens are veins like a pump .
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WEBApr 1, 2013 · Installation of new liners reduce the internal mill volume. 2. Possible packing of material in between lifters. 3. Decrease in grate open area if discharge grates are relined. 4. Suitable but overdesign of new liners causing a decrease in breakage. 5. Unsuitable design of new liners for the mill in question.
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WEBSep 20, 2018 · A Discrete Elements Method (DEM) study of load movement within a SAG mill 12,192 × 7620 (40′ × 25′) in normal operating conditions is performed. The purpose is to determine how the geometry of the lifters affects the kinetics of the load inside the mill. Specifically, the changes produced by the incorporation of inclined lifters and spiral or .
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WEBJan 1, 2013 · Besides grate design (open area and position of apertures), charge volume and mill speed were also found to have a strong influence on mill holdup and interact with grate design variables. View ...
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WEBApr 1, 1996 · A laboratory based study of tumbling mills has been undertaken in which the mill speed, grate open area and the position of the apertures were systematically varied and their effect on the relationship between water flowrate and holdup measured. ... A Fig. 2. Schematic of laboratory mill discharge grate. The flow of water to the mill was ...
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WEBJan 1, 1998 · The most recent version of the sag mill model was used and incorporates the effect of ball load, feed size and speed (Morrell and Morrison, 1996) as well as the effects of grate design (Morrell ...
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WEBUsing scanned results for new and worn shell liners for a 32' ( m) SAG mill, it is shown that the feed and discharge lifters have significant effect on the flow of the charge introducing ...
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WEBJan 1, 2014 · mill discharge has grate openings of mm and the discharge grate was, for selected test s, equipped with pebble ports measuring inches (6 3 mm). The mill was installed on top of a set of ...
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WEBThe discharge grates of the SAG mill were identified as a key component in the SABC circuit, and their design is a crucial factor in the mill's performance [17][18][19] [20] [21]. The initial ...
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WEBeffect of grate discharge area of sag mill performance. The discharge grates of the SAG mill were identified as a key component in the SABC circuit, and their design is a crucial factor in the mill's performance [17,18,19,20,21].
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WEBNov 1, 1997 · First, the ore that enters the mill (with a size distribution of fi) is subject to the size reduction process in the grinding chamber. The product of this stage (represented by the fictitious flow P*, t/h) undergoes internal classifiion stages and transport towards discharge, determined by the grate – pulp lifters – discharge cone discharge .
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WEBAug 1, 2007 · The 1m mill was used to investigate the effects of three lifter configurations, namely Hi (High), Rail and HiLo (HighLow), and mill speeds on the mill performance.
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WEBSAG mill throughput as a function of grate open area As shown in Figure 2 the grate open area has a strong effect on Sossego SAG mill throughput. The nominal capacity of the circuit should be achieved with a combination of % ball charge and % open area with 3 and inch apertures.
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WEBApr 18, 2018 · No pebble ports in the grates (SAG circuit). b) Semi autogenous grinding in which the pebble fraction of mill discharge (+½ in.) is taken out through pebble ports for separate crushing and ball milling. The minus ½ in. fraction of mill discharge is recycled to the SAG mill through a classifier.
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WEBIn conjunction with the grate open area, the performance of the pulp lifters dictate the volumetric discharge rate of slurry out of the mill. The crosssection of a typical low level grate discharge mill (A) with pulp lifters positioned between the grate and the discharge trunnion as well as their general arrangement (B) is shown in Figure 1.
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WEBAug 1, 2014 · The discharge end design of a ball mill plays an important role in discharging the desired particle sizes (−150 + 10 µm) and the percentage of recirculating load from the discharge end of the ...
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WEBThe discharge grates of the SAG mill were identified as a key component in the SABC circuit, and their design is a crucial factor in the mill's performance [17] [18][19][20][21]. The initial ...
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WEBDec 1, 2012 · SAG mill geometry and operating conditions. To explore three dimensional slurry flow in a SAG mill, including discharge through the grates and flow in the pulp chamber, we use a pilot scale Hardinge 6 ft (D) × 2 ft (L) ( m × m) mill. The model contains the complete mill geometry including the feed end, the .
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WEBOct 15, 2019 · The performance of grinding mills depends on many factors including design and operational parameters, which include liner profiles, grate design and grate open area, pulp lifter design, mill's ...
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WEBJul 1, 2003 · Influence of open area on discharge rate through the grateonly and gratepulp lifters with medium size radial pulp lifter (MRPL): (a) grateonly discharge and (b) gratepulp lifter discharge. However, with the pulp lifters fitted, the discharge rate was found to marginally decrease up to % open area and then remained constant with .
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WEBFeb 1, 2019 · A diameter pilot scale SAG mill which includes realistic end walls and a discharge grate is used. This size of mill is used for scaleup and design processes for industrial SAG mills so ...
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WEBJun 1, 2006 · The purpose of the pulp lifters is simply to transport the slurry passing through the grate holes into the discharge trunnion. The performance analyses of conventional design of pulp lifter have shown that a large amount of slurry flows back from pulp lifter into the mill. The degree of slowback depends on the size and design of the pulp ...
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WEBApr 1, 1996 · A laboratory based study of tumbling mills has been undertaken in which the mill speed, grate open area and the position of the apertures were systematically varied and their effect on the ...
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WEBNov 1, 2015 · Grate parameters include size of grate apertures and pebble ports, and open area fraction of grate and pebble ports. The fine size parameter comes from the SAG mill model fitting. Discharge functions used in simulations are presented in Fig. 15. No interactions between the mill discharge and the liner profile are considered.
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WEB1996): Jp = k (7) where. Jp = fractional slurry holdup. D = mill diameter (m)The discharge of water from pulp lifter in pilot scale mill is shown in Figure 5 and the discharge of slurry from single stage SAG mill operating at 13 rpm (78 per cent critical speed is shown in Figure 7.
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WEBThe literature exposed a clear lack of previous research on the influence and performance 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.
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