size F80 of 152 mm to 80% passing mm, and a simple adjustment procedure in case the SAG product size needed to be adjusted. Bond rod and ball mill work indices are readily converted to pinion energy for rod and ball mills but not for SAG mills. Reproducibility, while not studied in this paper is clearly a part of the meaningfulness of the data
WhatsApp: +86 18838072829Since the SAG mill duty is to maximize production of a size suitable to be treated by the ball mill, it will require a short residence tim e and a higher aspect ratio (D/L) mil l. The ball mill on ...
WhatsApp: +86 18838072829SAG mill base power was estimated from pilot plant data at kWh/t, the basis was a SABC circuit of 8% ball charge. Maximum SAG mill power was determined by deducting the installed ball mill pinion power of kWh/t from the maximum overall circuit power of kWh/t to give kWh/t. Overall power for the comminution circuit (SAG plus ...
WhatsApp: +86 18838072829The SAG mill pinion energy, W SDT (kWh/t) and SAG discharge Bond ball mill work index, S dBWI (kWh/t), are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P information, along with the ore specific gravity, is used to calculate necessary mill sizes and motor power in industrial applications.
WhatsApp: +86 18838072829With high aspect ratio SAG mills total charge to ball charge ratio should be greater than 2 (up to ) for a coarse mill feed (say F80 > 110 mm). If the mill feed size is fine, say 50 mm or 30 mm, then you are looking at a total charge to ball charge ratio of about
WhatsApp: +86 18838072829SAG / Ball Mill Monitoring. Condition Monitoring to Ensure Reliability for Critical Grinding Equipment in Mining . Today's mining operations must keep crucial milling assets online and running optimally, but variations in ore particle size, feed rate and moisture content, can lead to plugging, high vibration and machine bearing wear, and ...
WhatsApp: +86 18838072829the AG/SAG mill (because there is no recycle), but loads the ball mills instead. Often an existing plant that observes their SAG mill is limiting throughput, but the ball mills are underloaded can opencircuit the primary mill to better balance the grinding load with the secondary mill. The coarse transfer size to the ball mill makes this circuit
WhatsApp: +86 18838072829Depending on the mill size the SAG mills draws between 2 MW and 17 MW. 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 ...
WhatsApp: +86 18838072829The SAG Mill has a "small" circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates. The load of 4″ balls in this SAG is "good" but unmeasured. SAG Ball consumption is "average" at 400 g/t while Ball Mill grinding media (3″ balls) usage in 550 g/t. Yet, you add steel and nothing ...
WhatsApp: +86 18838072829SAG mill drive systems used on the same size grinding mill: ... ball mills, 18x27 drive with an air clutch. motor, 602,000 6050 D Primary SAG, 34x1 6 Two vafiable speed dc motors coupled mill, 4 million 22,500 to a gear drive with air clutches. motor, million each 6000
WhatsApp: +86 18838072829Table 3 Effect of Feed Size on Primary Mill Capacity SAG Mill Net Milling Rate SAG Mill Pinion Power F80 SAG Mill T80 SAG Power from F80 to T80 Operating Work Index Source Data: Placer Dome Asia Pacific. tph kW mm um kWh/t kWh/t. Secondary Crush 860 3793 2880 Primary Crush 570 4255 1650
WhatsApp: +86 18838072829Number, size and mass of each ball size depends on mill load and whether or not the media is being added as the initial charge. For the initial chargin of a mill, Coghill and DeVaney (1937) defined the ball size as a function of the top size of the feed,, dâ†"V = KâˆšF dB = ball size (cm) F = feed size (cm)
WhatsApp: +86 18838072829It is strange to see opposite direction (increase or decrease ball size) to increase SAG throughput. I am coming from the same underground school of thought of Mr. Starkey there is more attrition and much less impact in the SAG mill than people thinks. ... 15 kWh/t from SAGDesign SAG hardness) to increase the production and decrease the SAG ...
WhatsApp: +86 18838072829operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primarycrushed ore to ball mill feed. In recent years, the trend has been towards largersized SAG mills with diameters of m (34 ft) and above, with the largest being m (40 ft) in diameter and drawing 20 to 22 MW ...
WhatsApp: +86 188380728291. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powderlike structures. 3.
WhatsApp: +86 18838072829the SAG mill or Ball mill in the range of SAG product size adjustments from mm to mm. The SAG mill transfer size T80 can be adjusted using the Bond Work Index, for product sizes coarser or finer than the basic SAG product (T80) of mm. More specifically, in the T80 range of to mm,
WhatsApp: +86 18838072829Depending on the mill size the SAG mills draws between 2 MW and 17 MW. 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.
WhatsApp: +86 18838072829At the end of 2010, the SAG mill ball size was changed to 10mm but pro5 ved to be unsuccessful, with the mill becoming unstable due to insufficient ball charge and a feed topsize of between 38 mm and 50 mm. A blend of 125/105 mm media was used from December 2010 until March 2011 when the 125 mm
WhatsApp: +86 18838072829In order to eliminate the impact of the accumulation of rock, the autogenous mill allows to add about 3% of the ball (Φ80 ~ Φ120), SAG mill steel ball filling is generally 8% ~ 12%, even up to 15%.
WhatsApp: +86 18838072829same conditions apply in sag mills. However, in this case the required balance between coarse and intermediate size rocks is different to that for ag mills. This is because the steel balls in the sag mill do the duty of the larger rocks. As a result the more balls that are loaded into the sag mill the fewer larger rocks are required.
WhatsApp: +86 18838072829SAG 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. AG mills, on the other hand, are smaller and are typically used for ...
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