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A SAG mill operates with a 10000 hp motor. Typical power draw is 80% of maximum. The 80% passing feed size to the mill is 5 inches and the mill discharge has an 80% passing size of 2.1mm. How do i calculate the Operating Work Index for this mill if the feed …
The SAG mill pinion energy is determined from the SAGDesign™ testwork results as follows : W SDT = revs (16,000 + m s)) / (447.3 m s) where : W SDT = AG/SAG Specific Pinion Energy from a F 80 of 152.4 mm to a T 80 of 1.7 mm, kWh/ton ground revs = Cumulative number of SAG test mill revolutions to 80% passing 1.7mm m s = SAG mill feed sample ...
The SAG mill is equipped with a variable speed drive to allow the mill to operate between 1,500 t/d and 2,300 t/d. Furthermore, it is possible to increase the daily throughput by increasing the motor size, as previously indicated.
The operating principle of the ball mill consists of following steps. In a continuously operating ball mill, feed material fed through the central hole one of the caps into the drum and moves therealong, being exposed by grinding media. The material grinding occurs during impact falling grinding balls and abrasion the particles between the balls. Then, discharge of ground material performed ...
Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Outotec is the world leading supplier of gearless SAG mills operating globally.
SAG mill product size distribution (T) as follows: Q2 = Q - Q1 [5] T2' = [Q x T – Q1 x T1'] / Q2 [6] Finally, the corrected Bond operating work indices for the AG/SAG mill and ball mill can be re-organised as [7] and [8], where B'Wio and A'Wio are the corrected operating …
The significant impact of comminution cost on total operating costs is indeed a proven fact;I believe that improved comminution economics will result from hybrid systems i.e. SAG Mill- HPRG systems; as the HPRG throughput is volume limited the easy work therefore should be done in a SAG mill and the hard work i.e.pebble crushing by HPRG.
different grinding media of ball mills, rod mills and SAG mills. Crushing ratio Comparison. The biggest feature of SAG mills is the large crushing ratio, which can crush and grind the materials to 0.074mm at one time, accounting for more than 20% to 40% of the total product.
SAG Mill #5; ii) Modifying operating mode, considering as optimization criteria the SAG Mill discharge (increasing speed) and improving washing and classification efficiency in the trommel and SAG screen, also supported by reduction in solid percentage inside SAG mill. As a result, there is a reduction on pebbles generated and fines contents in ...
SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option of operating at higher ball charge volumes (15% v/v to 20% v/v) has in turn led to higher motor power ratings. Figure 2: On achieving enhanced operating capability to 18% v/v ball
A SAG mill operates with a 10000 hp motor. Typical power draw is 80% of maximum. The 80% passing feed size to the mill is 5 inches and the mill discharge has an 80% passing size of 2.1mm. How do i calculate the Operating Work Index for this mill if the feed tonnage rate is 1200t/h?
In multi-stage ABC/SABC circuits, the AG or SAG mills are in closed circuit with screens and pebble crushers. The mill discharge from these mills consists of slurry, which goes to the ball mills for further grinding, and coarse pebbles/rocks, which are crushed and sent back to the mill.
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
In this training module, we'll cover the workings of a semi-autogenous grinding mill, or SAG mill, that's designed to be the first stage of a grinding circui...
We all know ball mill is a chunk of gear for grinding mills supplies, and it's extensively used in manufacturing lines for powders such as cement, silicates, refractory materials, fertilizer, glass ceramics, and many others. in addition to for ore dressing of both ferrous and non-ferrous metals.
The SAG mill will operate in closed circuit with a trommel screen and a vibrating screen, while the ball mills will operate in closed circuit with hydrocyclones. "The mining fleet during the initial stages will include two P and H 2800 class electric shovels, a 6060 hydraulic shovel, two front-end loaders, and 793 haul trucks;
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 ...
VANCOUVER 2015 SOSSEGO SAG MILL – 10 YEARS OF OPERATION AND OPTIMIZATIONS A. M. Mendonça1, D. Luiz1, M. Souza1, G. Oliveira1, H. Delboni Júnior2, and *M. G. Bergerman3 1 Vale S.A. Mina do Sossego, S/N Vila do Sossego Canaã dos Carajás, Brazil 68537 00 2 HDA Serviços Ltda., Professor - University of São Paulo Av. Prof. Mello Moraes, 2373 São Paulo, Brazil 05508-030 3 …
SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill.
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 ...
SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill. Via the use of sophisticated instruments and software, we closely monitor the mill impact location to boost ...
It describes the coupling of single vibration sensor data from the CSIRO on-line monitor to the actual operating conditions of a SAG mill and how the vibration response and hence mill operating ...
Our SAG mill strategies automatically adjust feed rate, mill speed and water addition to reduce upsets, eliminate grind-outs, protect liners/lifters, and increase tonnage . We maintain desired operating conditions by constantly monitoring bearing pressure, mill power, recycle pebbles, mill density, charge toe and mill acoustics,
Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that the mill absorbed power depends on operating parameters other than ball level, such as pulp density and liner configuration. Figure 2 shows that there is no linear relation between
SAG Mill Design and Specification Operating Problems Since Commissioning Design Changes and Future Operating Strategies AG and SAG mills …
operating SAG mills in Australian and Chile using sensors inserted into grinding media and sensors fixed to the rotating mill shell. The dynamics of the operating mill are so complex that modelling and test work falls short of providing reliable actionable insight for …
• 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 ...
In the past, when primary, secondary and tertiary crushers fed material directly to large ball mills, the energy efficiency of the concentrator was determined for the most part by the ball mill operation, whereas now the energy efficiency of a plant often rests largely on the SAG mill operation.
Figure 4 SAG mill shell delivered. Figure 5 SAG mill cradle being installed. Figure 6 Construction camp progress, 3 out of 4 dorms installed. Qualified Person. John Kiernan, P.Eng., Chief Operating Officer of the Company is the Company's Qualified Person (QP) as defined by National Instrument 43-101 and has reviewed and approved the technical ...
Download Table | SAG Mill Circuit Major Operating Costs from publication: Optimisation of the Cadia Hill SAG mill circuit | | ResearchGate, the professional network for scientists.
SAG mill. SAG is an acronym for semi-autogenous 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' (12.8m) in diameter, powered by a …
