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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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Effective SAG mill control will maximise throughput, minimise damage to mill internals (liners and lifters) and contribute significantly to achieving maximum recovery in flotation. Well designed and implemented SAG control will payback in weeks not years. SAG mill control is essentially the stabilisation of mill load (and/or power) and density
Control stabilization for SAG mills. BrainWave is ideally suited to stabilize the operation of SAG mills. Effective grinding in a SAG mill depends largely on how it is loaded. A mill containing too much material does not allow for adequate movement of the ore and balls. A mill that does not contain enough material does not take advantage of the ...
SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine. Based on the high throughput and coarse grind, AG mills produce coarse grinds often classify mill discharge with screens and trommel.
Fig. 3 compares the regulatory response of two robust SAG mill controllers to a number of step changes in the disturbance variable F 80.At t=5 h, F 80 was stepped up from 61.5 to 63.3 mm (i.e. the feed particle size distribution was increased), while at t=36 h, F 80 was stepped down from 63.3 to 57.7 mm (i.e. the feed particle size distribution was decreased).
Sino Grinding determined that any SAG grinding balls it produced would need to withstand high levels of impact and should possess superior abrasion resistance. The current product range includes seven different types and grades of forged steel SAG grinding media in sizes ranging from 90 mm to 155 mm. Each grade has variations in chemistry ...
a milling circuit design that can achieve a desired throughput on a specified proportion (typically 75%) of the samples. Planning a feasibility test program The first steps in the procedure are the same as outlined for the pre-feasibility program, except more samples are collected based on geostatistical targets.
Figure 3 - Polar Plot Energy Examples: Mill Empty, Mill Full, Mill Filled w/Clay (left to right) VIBRATION CONTROL STRATEGY & RESULTS The basic goals of SAG mill control using these new signals is to increase and stabilize the throughput of material through the mill to cut specific energy consumption and extend liner life. This is
Fuzzy logic has been applied in the control of SAG mill feed size variation in the Ok Tedi Mines, resulting in higher throughput (McCaffery et al., 2002). Hybrid neural network MPC control has ...
The difficulty of stabilizing SAG mill load limits the effectiveness of feedback control approaches. Control is particularly difficult during periods when the feed ore is either unusually hard or fine. There is also a strong tendency to lose control during transient periods when feed ore changes. The control problem is also compounded by long process deadtimes, recycle streams, noisy ...
SAG mill discharge control is somewhat more involved, because there exist a few interactive variables, such as mill discharge sump level, classification hydro-cyclone variables (feed density, flow ...
The right determine of SAG feed size. This depends on the mill diameter and the ball size. Feed size necessary to take 80% of the maximum piece of ore that will crushed by the balls. For the big SAG more than 8 meters optimal feed size will be - 50mm. Ball size - 120 ... 125mm. Do not a pebble crushing, the need secondary crushing.
Supply 50000 tons grinding balls for SAG Mill 1.Hardness:55-65 2.Impact toughness:>12 3.Diameter:DIA20MM-DIA150MM Best quality and competitive price Jinan ..
SAG circuits are common in the industry based on: High single-line capacities (leading to capital efficiency) The ability to mill a broad range of ore types in various circuit configurations, with reduced numbers of unit operations (and a corresponding reduction in the complexity of maintenance planning and coordination)
Even though it is a relatively minor wear part, the feed chute seal affects performance, lifecycle and safety in the SAG mill - and a failure can be disastrous in more ways than just time and money. One of the main issues with poor sealing between the SAG mill inlet chute and mill itself is the failure to retain water inside.
The Control philosophy controlled to a mill load set-point by automatically adjusting the ore feed rate, and the acoustic control controlled the mill speed. This is all a commissioning exercise and one of the things we wanted to do was - incorporate an additional loop whereby mill speed is automatically adjusted to control mill weight/load.
Operating conditions in a grinding circuit are frequently such that production is significantly reduced due to the effects of process disturbances, most notably those associated with the feed...
34 ft. x 17 ft. -12,500 HP SAG Mill Minerals Industries, Inc. 240 Arch Street, P.O. Box 15312 York, Pennsylvania, USA 17405-7312 Phone: + 1 717 843 8671.
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