Operational intelligence plays a pivotal role in enhancing productivity within the SAG grinding process. The SAG Digital Twin is a comprehensive diagnostic, analysis, control, and operational optimization tool. It mirrors the operational state of the SAG mill, providing insights and recommendations for adjustments that enhance stability and ...
E WORLD'S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILLABSTRACTIn 2010 Newmont made the decision to purchase a 42 foot (ft) Semi-Autogenous Grinding (SAG) mill from and a 28 Mega-Watt (M. Gearless Mill Drive (GMD) from ABB for the Conga Project in Peru. The test and study work showed that a single line 42 ft SAG …
The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia. Problems have been experienced with the twin pinion drive at Fimiston and with the ring motor at Cadia. At Cadia, excessive vibration and deflections in the drive stator were encountered during commissioning of the mill and later ...
Both mills differ in terms of the efficiency of grinding. Ball Mills have a higher degree of efficiency than SAG Mills due to their smaller size and have more area for grinding particles, leading to faster grinding. On the other hand, SAG Mills have a larger and deeper drum that provides larger lifting force which increases grinding efficiency.
not an option for a 42ft Gearless Mill Drive. The ring motor is not self-supported and needs the mill to fix the rotor poles to and it needs the mill foundation to support the stator. Finally you would need a few thousand tons of ore and possibly even an earthquake would be needed to have a realistic test environment representative of a mine site.
Generally, it happens when you have coarse and/or hard ore going to the SAG mill, its center of mass shifts to a new position and mill drive consume more power because of the extra torque generated. It can also result in to the overloading of SAG mill (also depends on other process variables). I am facing an issue in predicting correct power ...
The single line grinding circuit at Bond Gold's Colosseum mine consists of variable speed drive semi-autogenous (SAG) milling and secondary grinding with a fixed speed ball mill. ... The second step to …
Paper held at SAG Conference 2011 - By S. Gaulocher (ABB), K.S. Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in …
Often used in the mining process of precious metals, the SAG mills break up solid ore into small pieces for processing. We understand the importance of the SAG mill and have …
Key Benefits. Reduce critical impact. Increased energy efficiency. Reduced operational costs. Increased production. Full return on investment within six months. Products. SAGwise will reduce the number of critical impacts inside your SAG Mill, protecting your liners from critical impacts while lifting performance.
AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG mills, it is more common for SAG mills to he used as the primary stage of grinding, followed by a second stage of milling. AG/SAG circuits producing a fine grind …
Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the world. The contract includes the design and manufacture of a Ø 40' x 29' SAG mill. The mill will be driven by a Gearless Motor Drive (GMD) which at 28.0 MW is equal to the largest grinding mill power ever used in the mining industry. The SAG ...
Rio Tinto has commissioned Siemens Industry, Inc. to modernize three semi-autogenous grinding (SAG) mills at Kennecott Utah Copper's Bingham Canyon mine/plant complex …
of one FL 40 ft. diameter × 22 ft. long (EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two. FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG m. lls in the world and represented the first 40 ft. S.
has been selected to design and supply a 42 ft x 25 ft, (12.8m x 7.6m) 28 MW gearless SAG mill, plus two 26 ft x 42 ft, (7.9m x 12.8m) 15.6 MW ball mills and two VTM-1500-WB VERTIMILLS ® for Newmont Mining Corporation's Yanacocha Conga copper-gold project in Peru. The 42 ft diameter SAG mill is the world's largest and is the first of its kind.
WEBABB's Gearless mill drive system is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills.
A SAG mill, or semi-autogenous grinding mill, is a type of machine used in mining and mineral processing operations. It uses the crushing and grinding action of rocks to reduce materials such as copper ore into smaller pieces for further processing. Unlike traditional mills that rely on steel balls or other media to break down materials, SAG ...
Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit …
services to drive your mill's performance Introducing a new name Outotec is proud to announce the launch of our new rebranded offer: Outotec Gears and Pinions. You ... • AG and SAG mills • Ball and FGD mills •Pebble and rod mills • Multi-compartment mills • Rotary kilns and dryers • Mixers and other equipment
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Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive option (60 to 80% critical speed), which is required for process reasons. ... and variable frequency drive technology on twin pinion drive systems. Early attempts to provide load sharing on twin pinion drives ...
Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves …
SAG mill drives. There are two types of SAG mill drives. Power is transmitted to the grind-ing mill either through a pinion and ring.
Select™ SAG Mills. Drive Ø Diameter EGL Length Installed Power L/D Gear Driven 3,80 m (12,47 ft) 1,90 m (6,23 ft) 400 kW (536 HP) 0,50 Gear Driven 3,80 m (12,47 ft) 2,85 m (9,35 ft) 550 kW (738 HP) 0,75 Gear ... Select SAG Mills Created Date: 3/22/2021 9:13:37 AM ...
Autogenous grinding is favored when the ore is quite competent and a fine grind is required. Semi-autogenous grinding is applied when fine crushing could cause severe problems or when ore is variable in hardness or competency. Figure 2 shows a typical conventional crushing-grinding circuit with three stages of crushing followed by …
SAG Mill Horsepower — Drive Power. When the normal operating horsepower has been defined. It can be related to a design drive horsepower. ... The SAG mill was sized with 746 kW to give a 25% …
Gross power = 265 + 1.26 × (2,233 + 215) = 3,349 kW. The conversion between motor input (gross) power and mill shell power, described earlier, is 0.931. Therefore, the predicted power at the mill shell is 3,119 kW, which is 71 kW less than the measured shell power (3,190 kW), a difference of 2%.
Ignoring mechanical losses in this drive train, the power transmission at each stage, defined as torque x speed, is constant. The typical mechanical inching drive motor speed is around 1500 to 1800 RPM while the mill inching speed is in the order of 0.1 to 0.15 RPM. Thus, the gear reduction ratio between the inching drive motor and the …
The single line grinding circuit at Bond Gold's Colosseum mine consists of variable speed drive semi-autogenous (SAG) milling and secondary grinding with a fixed speed ball mill. There are several …
• 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 ...
This puts the application in the realm of a single mill with gearless drive or, possibly, twin motors each with a twin pinion. See later discussion on aspect ratio. If the aspect ratio is low, then the limit of mill size is ... 3 SAG mill (8 – 15% ball charge) Variable competency ore 4 High ball charge SAG mill (15 to 25% ball
Table 1 includes the technical data for the Copper Mountain SAG mill. Table 1 - general SAG mill data Specification Data Mill size 10.363 M [34 feet] diameter by 6.096 M [20 feet] long Mill type Wet grinding, grate discharge Mill drive motor size 17,000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10,363 mm Length 6,096 mm
The future of SAG mills. June 5, 2024 Jonathan Rowland. SAG mills are well established in the mining industry with several possible flowsheets featuring them. But these circuits consume significant amounts of energy and water. With alternative grinding options providing a means to decrease energy and water use, North American Mining asked a ...
