Process optimisation for your SAG Mill Total Cost of Ownership Tool Back. Conveyor Volume Flow Control. Back. Digital Twin Belt Conveyors ... Gear Drive Rotary Kiln. Back. Indirectly Heated Rotary Kiln. Back. Flash Dryer / Flash Heater. Back. Hydro-Aire Dryer/Heater. ... How we used our ring gear innovation to improve a mining operation in …
SAG mills are similar, but with the addition of relying on the material itself to help grind the aggregate into a smaller size. Ball and SAG mills work with material of different sizes and densities, and both take a lot of power to do their jobs. ... When in place, a torque limiter reduces the likelihood of gear drive damage. After an overload ...
When the gear ratio between the motor pinion and the big gear on the outside of the roller is known, the rotation speed of the mill roller can be controlled by controlling the rotation of the motor. ... M.A. Modeling and Evaluation of Cycloconverter-Fed, Two-Stator Windings SAG Mill Drive. Part II: Starting Evaluation. IEEE Trans. Ind. Appl ...
A complete range of gear and pinion sets, inspections, design, installation and alignment 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 can expect the same quality supported by decades of gearing and OEM expertise.
• 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 …
This applies whether purchasing a large Gearless Mill Drive (GMD) or a conventional gear drive. T = P ×(2π×ω)−1 (1) where, T is motor output torque measured at the output shaft ... The paper specifically describes SAG mills, but the equa-tions and principles apply equally to any conventional tumbling mill, such as AG, ball or rod ...
Semi-autogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diameter-to-length ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ball-milling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These
Swivel type lead-bronze bushed trunnion bearings are generally furnished on large diameter ball Mills. The bearing swivels are of Meehanite metal spherically turned outside and bored and faced inside to receive the removable bushing. The bushing is bored and scraped to fit the mill trunnion. The bushing is provided with end flanges thus ...
Semi-autogenous plus ball mill has been the "work horse" of mills. SAG vs Ball Mill Advantages . AG & SAG Mill Grinding Compared – Which is Best. Grinding rods and balls can be obtained in uniform sizes, weights and of a specified quality. Their action in a mill can be reasonably predicted.
Plant Concept SAG Circuit HPGR Circuit Equipment 1 x SAG Mill 9.8 MW 1 x Secondary Crusher 750 kW 1 x Pebble crusher 450 kW 1 x HPGR 4.0 MW 2 x Ball Mills 5.6 MW each 2 x Ball Mills 5.6 MW each Screens and conveyors 0.5 MW Screens and Conveyors 1.5 MW Total drive capacity installed 21.95 MW 17.45 MW
higher mill speed should always be considered when set-ting gear ratios, service factors, and motor power ratings. For gearless drives, motor torque output at the maximum …
We utilize 2 x 6500KW drive motors in parallel on our SAG mill. One of the world's largest geared drive configurations is in Wushan, China, where they use 2 x 8500KW motors. ... With our SAG mill ...
The single helical SAG mill girth gear, which is cast in four pieces, has 362 teeth, 0.75 DP, 863.6 mm face width, 12.4 m outside diameter and a 10.5 m diameter bore. It's manufactured ... 1605 Industrial Drive Auburn, CA 95603 Phone (530) 885-1939 Fax (530) 885-8157 Web: Call 530 885-1939 or visit …
By mill we refer to Ball Mills, Rod Mills and SAG Mills. Anything gear and pinion really. ... To protect the motors from damage, clutches, torque convertors or fluid couplings have been added to some drive lines. An air clutch allows the motor to be brought up to full rpm before the load is put onto it. Once the clutch has been engaged it gives ...
SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. 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
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 (particularly ...
The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four 16.5 MW GMDS are employed in 26 football mills along with associated control systems.
By current stan-dards, girth gears can be as large as 14 meters (46 feet) in diameter, 1.1 meters (44 inches) face width, and 50 module (.5 DP) tooth size, and weighing upwards of 120 tons. Flange mounted gears rely, in large part, on the mill structure to pro-vide the stiffness and geometric stability required for successful operation.
11. Lubricant Data: Masbate Gold Project's SAG mill uses Compounded Gear Oil as their main lubricant. But a different class of Gear oil is use in every operating system of the SAG mill. SAG Mill Components Type Characteristic Motor Bearings Omala 150 Gear oil. 150 viscosity at 40 C and 15 viscosity at 100˚C Gearbox Omala 320 Gear …
Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. ABB's GMD is the most powerful mill drive system in the market to power semiautogenous …
Comparison between girth gear drive and central drive. =---;=-'I----- ----- Example : Ball mill 9000 HP Motor speed 990 rpm Mill speed 14 rpm R/L ill diameter 5 m Mill bearing 22 m ... Elastic mill sag by weight of mill balls and materia! to grind A: After temporary alignment of the teeth of pinion and girth gear with the
the. decision making process. This article examines how the NPC calculation, plus reliabil-ity and power source, influence SAG mill selection. 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.
The total time to clean & inspect a large 40' SAG mill gear is under 8 hours. ... Cleaning and inspection times for a 10m mill gear drive is seven hours. Inspections per ASTM E2905, penetrate just below the surface of ferrous materials to accurately detect cracking, macro-pitting, and subsurface precursor macro-pitting damage. ...
Mill, gear and pinion friction multiplier: 1.025; Mill Power required at pinionshaft = (240 x 16.5 x 1.025) ÷ 0.746 = 5440 Hp; ... SAG Mill Horsepower — Drive Power. When the normal operating horsepower has been defined. It can be related to a design drive horsepower.
2 d4 TM Mill Drivesystem 7 MW 7 MW 14 MW 28 MW 7 MW 4 MW 7 MW 7 MW 7 MW 4 MW 7 MW 7 MW SAG mill 32 ft. single drive The natural progression in gear/pinion mill drives: The QdX4TM Mill Drive provides the next step in the evolution of change in mill drive architecture, while allowing the system to be built with components that are …
The two installed mills include a semi-autogenous (SAG) mill measuring 10.4 x 6.1 m with a drive output of 15 MW; and a ball mill rated at 18 MW. The SAG mill reduces ore fragments with a maximum size of 250 mm …
Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding media. Our ball mills are the most robust design in the industry, available with either geared or gearless drive arrangements. The cost-effective FT Series mills are smaller, gear driven and feature hydrodynamic lubrication.
between the two driving motors to maximize gear and mill life. For Induction motors, a VFD will compensate for poor power factor resulting from the motor operation. ... drive application is a dual-pinion SAG mill driven by two 5,000 kW …
With inside dimensions of 36-ft diam. and 19-ft long, this semi-autogenous grinding mill (SAG — see next section) will use a 43-ft diam. ring-gear drive to transmit 18,000 hp and handle up to ...
Drive packages from a single source: industrial gear units and segmented girth gears. Large girth gears are installed around the cylinder to rotate the horizontal ball mill cylinders. A pinion connects these directly to the industrial gear unit. SEW-EURODRIVE does not just provide industrial gear units, we provide the complete drive package ...
Figure 4: Two SAG Mills 24MW each and Two Ball Mills 16.4 MW each with Gearless Mill Drives For larger applications the well-proven Gearless Mill Drive (GMD) technology has shown to be very effective since its introduction in mining in 1980; currently in operation for horizontal mills up to 40 feet (~12.2m) diameter with
Image credit: Rexnord Corporation. An inching drive is used as an auxiliary system to the main drive for a large machine such as a ball mill, industrial kiln, conveyor, or elevator. Its purpose is to turn the equipment at a speed slower than the normal operating speed — typically 1 to 2 rpm, although fractional rpms are also common — and to ...
a SAG mill with an end-discharge grate, a sump and a hydrocyclone. The mill receives four streams as inputs: mined ore, water to assist with material transport, steel balls to assist with ore breakage, and under ow from the hydrocyclone. This study assumes that a VSD tted on the mill motor can be used to manipulate
3. The maximum ball loading capacity of AG mill is calculated at 3% of effective mill volume, while the SAG mill with ball loading capacity at 15% of mill volume. 4. The operating speed is usually 75% of critical speed of mill, the variable frequency speed regulation is ideally somewhere between 5% to 10% of rated speed.
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. Dan B. Kivari and John Chapman are pro-fessional engineers with Kilborn Engineering Pacific Ltd., Suite 400,1380 Burrard St., Van-couver, British Columbia, Canada V6Z 2B7. gear assembly.
