Mar 13, 2018 Video 1 Mill Showing Surface Wear Modification Case scenario. Consider a large SAG mill with a diameter of 10.97 m, as shown in Figure 1a. The mill has a high-definition line design with alternating lines of high and low elevators Figure 1b. The mill processes rocks from 200 mm to 300 mm, using 350 mm steel balls as the grinding medium.
AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the basis for a variety of circuit configurations. SAG circuits are common in the industry based on High single-line capacities leading to capital efficiency The ability to mill a
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OBJECTIVE Describe in detail SAG mill circuits of large-scale plants and the benefits of each. Detail the issues occurred during SAG mill operation blockage of grates, cracking of bolts, liners and grates, flowback, carry over blockage and breakage of meshes from trommel and
Oct 09, 2020 operation parameters of a SAG mill, in this paper, the discrete element method DEM is used to simulate the breakage process of the particles by controlling three parameters, i.e., the mill speed ratio, the mill ll level ratio, and the steel ball ratio. This method simulates the particles size, mill
445 PAPER 28 Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1, Chief Engineer Guy Comeau2, Senior Metallurgist Colin Hardie3, Former Chief Metallurgist 1 Process Control Group, Xstrata Process Support 6 Edison Rd, Falconbridge, Ontario
Gearless mill drive GMD technology has further expanded the use of large AG milling allowing Metso Outotec to produce the worlds largest SAG mill of 42 in diameter drawing power at 28 MW. Today, Metso Outotec is the world leading supplier of gearless AG mills operating globally.
Ore is crushed in-pit, in three semi-mobile gyratory crushers. Overland conveyors feed two secondary crushers, and two mill trains each consisting of a 40 foot diameter 28 megawatt SAG mill twinned with a 44 foot length 22 megawatt Ball mill. The grinding mills are amongst the largest of their type currently operating in the world.
While many mills today are mounted on load cells, others employ bearing oil pressure as a proxy measurement of mill load. A control strategy recently implemented on a large variable-speed SAG mill at MMGs Century Zinc operation in Australia is shown in the chart found on pg. 32.
Oct 19, 2016 A plate steel gear guard is furnished with the mill for safety in operation and to protect the gear and pinion from dirt or grit. As soon as the gear and pinion have been cleaned and coated with the proper lubricant, the gear guard should be assembled and
Oct 05, 2010 Metso has been selected to design and supply a 42ft x 25ft, 12.8m x 7.6m 28MW gearless SAG mill, plus two 26ft x 42ft, 7.9m x 12.8m 15.6MW ball mills and two VTM-1500-WB VERTIMILLS for Newmont Minings Yanacocha Conga copper-gold project in Peru. The 42ft diameter SAG mill is the worlds largest and the first of its kind.
Operation of the SAG mill with a low ball charge volume prevented . ... These images photographs and video tapes were . analysed using the Split image analysis software to estimate the size .
The run-of-mine composition varying ratio of hard and soft strongly affects SAG mill operation. The feed characteristics typically influence the mill throughput, power draw, ...
Enhanced mill performance. SAGwise total process control uses specially designed acoustic sensors and proprietary process control software to monitor and respond to critical impacts inside your SAG Mill. Conditions inside your mill are automatically adjusted to minimise liner damage, stabilise and then optimise the operation of a SAG Mill.
Music to our ears A quick look inside the PureGold mill with Ball Mill and SAG Mill in operation. Music to our ears A quick look inside the PureGold mill with Ball Mill and SAG Mill in operation. Jump to. Sections of this page. ... Related Videos. 022. Our growth story has only just begun... The PureGold Mine. Pure Gold Mining. 391 views ...
constant adjustments to stabilise mill operation. SAGwise uses audio sensors close to the SAG mill load listen for undesirable, high-energy critical impacts inside the mill. While most SAG mill control solutions rely on a single sensor, SAGwise comprises four acoustic sensors installed in close proximity to the rotating mill shell.
SAGAG SCU SAGAG Sentinel Camera Unit SCU Concept of System. The SCU uses the latest technology in high-definition imagery within a custom designed housing, permanently affixed to the feed chute to provide a live audio and temperature feed in a running SAG mill and video feed from inside a stationary SAG mill.
involves replacing the mill charge several times throughout the test. The Bond tests are typically run for a minimum of seven cycles, while the MacPherson and pilot plant tests are operated for about 6-10 hours. The achievement of steady-state is desirable in a grinding test, because harder components may build up over time. For AGSAG mills,
The SAG mill trommel screen provides a simple mechanism to classify large volumes of mill product.. Many designers and mill operators believe that the benefits of simplicity and the ability to handle throughputs in excess of 5 000 tph of solids make trommels the preferred equipment for this application.
SAG Mill Wear Using Rocky Evaluate changing process variables For example, speed and fill level, or a new lifter design that incorporates changed face angle and height with a high degree of accuracy.
The idea and intention of applying this technology to SAG mills is not new. There have, no doubt, been many conversations which lamented the fact that the mysteries inside a SAG mill could not be directly observed via a camera, given the limiting assumption that such a camera could not survive the environment while providing a live video feed.
Jul 08, 2012 The SAG mill design is based on Outotecs proprietary grinding mill technology, developed over decades for maximum reliability and performance. The mill will be operated as a single stage SAG mill primary and secondary duty combined with very high throughput made possible by the use of Outotecs patented Turbo Pulp Lifter TPL Technology.
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 3032 and 78.5 critical speed.
VANCOUVER 2015 SOSSEGO SAG MILL 10 YEARS OF OPERATION AND OPTIMIZATIONS A. M. Mendon a1, D. Luiz1, M. Souza1, G. Oliveira1, H. Delboni J nior2, and M. G. Bergerman3 1 Vale S.A. Mina do Sossego, SN Vila do Sossego Cana dos Caraj s, Brazil 68537 00 2 HDA Servi os Ltda., Professor - University of S o Paulo Av. Prof. Mello Moraes, 2373 S o Paulo, Brazil 05508-030 3
Jul 15, 2021 Operation Escondida Mine. DEADLINE 15.07.2021. CLOSING TIME 1600 HRS. Share ... the total quantification of the accumulated Scrap of the three SAG mills of Los Colorados Concentrator, wear curves and previous experiences. Currently, the exact information of Scrap per mill is not available, which together with the technologies that operate in ...
Jun 24, 2006 Depending 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 2.0 and 7.5 kWh per ton of energy to reduce the particle size.
Jun 30, 2007 articleosti969329, title Online SAG Mill Pluse Measurement and Optimization, author Rajamani, Raj and Delgadillo, Jose and Duriseti, Vishal, abstractNote The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utilization of this tumbling motion for efficient breakage of particles depends on the ...
SAG Mill Circuit Example Gold Processing SAG mill circuit example for gold processing image 135-6-3 AGSAG Mill. AGSAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AGSAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
stage mills has typically required operation of an AG mill to provide adequate grinding media surface area and a consistent and competent feed. Consideration of the scale and likely power demand also has a major impact on circuit selection xPower demand of less than 8 MW. This puts the application in the realm of a single mill, single pinion ...
SAG Mill Discharge. Controlling the feed and discharge of a mill is mostly a stabilisation exercise you need to be able to quickly and accurately control the mill feed rate. If the mill feed setpoint is changed, then the actual feed rate needs to stabilise at the new target in a short period of time. The feed rate setpoint can then be tied ...
Today, 40 ft. diameter SAG mills and 30 ft. diameter ball mills, both with motor powers of more than 22 MW, are commonplace as mine operators look for even larger equipment to achieve greater economy of scale. Mills with these larger drive capacities are driven exclusively by a wrap around ring motor gearless mill drive.
The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical process variables impacting mill throughput. For most sites, one hour of operation provides a revenue between AUD 20,000 per hour up to or greater than AUD 100,000 per hour.
One major issue was the operation of the SAG mill caused vibration at an amplitude of up to 11 mm on the mill foundation and therefore it could not be operated at a production rate above 15,000 td. To eliminate this issue the mill foundation base was reinforced, effectively eliminating the vibrations and allowing for stable production at ...
Mar 15, 2021 Details of the complete SAG Mill package. The SAG Mill has a mill diameter of 24 feet and an Effective Grinding Length EGL of 18.5 feet and a structural charge mass of 315 metric tonnes. The structural design ball charge is 11 with a structural design load volume of 35. Specific gravity of the material is 2.55.
Mar 15, 2021 The SAG Mill is equipped with a variable speed drive which will allow the mill to operate between 1,500tpd and 2,300tpd. Furthermore, it is possible to increase the daily throughput by increasing ...