Twin Drive Sag Mill

Uneven SAG Mill Drive Power Draw

By contrast, the GE patented Quadramatic twin drive system will deliver precise load sharing between two low speeds Synchronous motors, driving through a common ring …

Flexible milling and grinding solutions that last | FL

Optimal feed material milling and grinding solutions. Carefully crafted to meet your milling and grinding needs, our robust and well-designed solutions are highly adaptable for a range of feed materials. With compact layouts, long-lasting wear parts and easy access for maintenance, you can save on civil, operation and maintenance costs.

HPGR High Pressure Grinding Rolls

HPGR test results published by Grier (1992) on gold ores from the Mt. Todd project showed significant energy savings for a HPGR/Ball Mill circuit as compared to a SAG/Ball Mill plant. By adding a Polycom high-pressure grinding roll, the throughput of existing plants can be increased by as much as 150% while simultaneously reducing the …

Updates on geared vs gearless drive solutions for grinding …

Some consultants have the view that the gear drive is limited in power. Mr Craig Denecki (Falk Milwaukee) in his paper, presented at the 1996 SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill (34ft x 18ft) at ndida 13.4MW, which began operation in 1995.

Outotec set for SAG mill Premier at …

Outotec says it will deliver a high-capacity, high-powered Premier™ SAG mill to Northern Star Resources Limited's Thunderbox gold mine expansion project in Western Australia.

Motors for Metal Rolling Mills | TMEIC

21-G Series Motors. TMdrive-10. TMdrive-10e2. TMdrive-30. TMdrive-50. TMdrive-70e2. AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose.

SAG Mill Components

SAG Mill Components Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin …

Mt Milligan Mine, British Columbia

The Mt. Mulligan mine produces ore of low-grade copper-gold. It has a capacity to grind approximately 2,717t per hour at 92% availability. The 12m semi-autonomous grinding (SAG) mill is powered by a 23.5MW gearless motor drive. The IsaMill machine is used for fine grinding the ore. It is one of the most energy efficient grinding …

SAG Mill Grinding Circuit Design

Single stage AG/SAG milling. AG/SAG mills as a primary grinding stage in a circuit with or without additional stages of comminution. Inclusion of pebble-crushing circuits in the AG/SAG circuit. Circuits above, but with feed preparation including two stages of crushing—typically referenced as pre-crushing.

(PDF) Technical evaluation and practical …

LCI SAG mill drive are shown in Figs. 4 and 5. The drive is This method consists of reducing the dc-link current to zero by a twin motor topology and is composed of two synchronous temporarily operating the rectifier in the …

Evaluation of synchronous motors on grinding mills

The subject of this paper is a synchronous drive of grinding ball mills 4 MW, 150 rpm, 6 kV, 50 Hz on the base of PWM CSI. The system is installed at the concentrating plant of Norilsknickel in ...

TECHNICAL AND COMMERCIAL BENEFITS OF …

general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.

How those little lakes along the San Andreas Fault came to …

The next Wrightwood sag pond was known as Wright's Lake, and it is located at the intersection of Lark and Mill roads. The pond took its name from Sumner Wright, the founder of the early ...

Rethinking the value of mill relining

Then, in the late 1980s when the price of copper rose quickly from a low of $0.62/lb to a high of $1.62/lb, this substantial increase in price further fuelled the industry demand for larger diameter SAG mills, with mill power quickly doubling from 15,000hp to 30,000hp (11,000-22,000kW). As SAG mills grew in size and number, so did the size …

Modelling SAG milling power and specific energy

In Fig. 3, Fig. 4 the data is presented in order to show the effect of the fresh feed size, particularly the % −6″ +1″ (−152 +25 mm), on the SAG mill power consumption (Pc) in kW and on the SAG mill specific energy consumption (Ecs) in kW h/t, obtained by dividing the power consumed (kW) by the fresh feed rate (t/h).

Selection criteria for SAG mill drive systems | IEEE …

Selection criteria for SAG mill drive systems. Abstract: The various options available for large-horsepower semiautogenous grinding (SAG) mill drive systems are examined, …

DEM Simulation of Mill Charge in 3D via GPU Computing

72 South Central Campus Drive Room 3750 Salt Lake City, Utah 84112 3 ... would have the capability to simulate all aspects of say a SAG mill during the design phase. Cleary and Morrison (2009) show that 3D DEM combined with SPH is a tool for analyzing mineral processing equipment such as mills, twin deck screen and so on. In a more recent study ...

Increasing availability through advanced Gearless Drive …

Mill speed can be adapted to upstream and downstream processes – avoids overgrinding, and optimizes load distribution between SAG and ball mill (Mular, Halbe & Barratt, 2002). Power consumption is influenced by load respectively torque and mill speed. This means that further energy can be saved if a mill speed below the rate speed is re-

Trunnion Bearing Assembly Ball Mill & Rod Mill

Ball Mill PINION SHAFT BEARINGS. Pinion shaft bearings are of the SKF anti-friction type mounted in a common twin bearing assembly. Bearings are fixed in place so that the pinion shaft of the mill is always in alignment with the drive components. V-belt driven mills are furnished with an outboard bearing of similar construction.

Used Mining & Processing Equipment

unused 22' x 38' (6706mm x 11582mm) ball mill, 10,000 kw (13,410 hp) twin pinion 50 hz motors and gear reducers ... egl sag mill with 6,300 hp (4,750 kw) variable speed drive. unused model cg850 60 x 113 gyratory crusher, 800 kw motor. unused fl 36' x 17' (11m x 5m) sag mill with 13,500 kw (18,355 hp) abb wrap around drive ...

ABB Library

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 …

SAG mill drive train modernization at OK Tedi Mining in PNG

SAG mill drive train modernization at OK Tedi Mining in PNG. April 2018; Authors: ... 4.3m long SAG mill pow ered by twin 3500 k W motors . before entering to two 5.0 m diameter by 8.8m long B all .

Central or Girth Gear Drive for Ball Mills

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 mill empty, Fig. 8a, re-alignment should be undertaken with the mill filled with mill balls, i. e. with reference to the elastic sag in cold con- dition, Fig. 8b.

Premium solutions for the cement industry

Digital Twin Belt Conveyors ... LoadIQ Smart sensor technology Process optimisation for your SAG Mill Total Cost of Ownership Tool Back. QCX® Advanced Quality Control Systems. Back. QCX® Laboratory software ... Steel recycling and reuse programme engages customers and suppliers to drive circularity in manufacturing. Read article. …

Grinding mills

has over 100 years of experience in horizontal grinding mills and has always been an industry-leader in innovative technology. 's unmatched expertise ensures delivery of your Premier™ mill or Select™ mill based on your operational needs. When choosing your equipment we not only keep in mind mill performance, but also considering ...

A comparison of SAG mill power models

varying it as the mill water addition rate changes. Loveday/Barratt Model Brian Loveday published a simple SAG mill model (Loveday, 1978) of the form in Equation 2. The equation uses mill dimensions (inside the liners), the density of the mill charge and an empirical "power number" that encapsulates the mill speed and volumetric filling.

SAG Mill Variable Speed Drive

SAG Mill Overview What we offer Key Benefits Product Features Key Benefits Get more done at a lower cost with higher throughput Easily find the perfect fit from our wide range …

Variable Speed Motors

Variable Speed Motors. The ABB synchronous motors are known for meeting the high performance standards demanded by many of key industries and industrial sectors all over the world. The synchronous motor platform ranges from 1 to 70 MW in both fixed and variable speed designs. Voltages range from 1kV - 70kV and all major enclosures are …

Grinding Circuit

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 30–32% and 78.5% critical speed. The SAG mill trommel undersize is combined with the ball mills' discharge and pumped to two parallel packs (clusters) of ...

SAG Mill Variable Speed Drive

The twin dc motor drive system with each motor connected to a pinion and each fed from a static thyristor power supply has been successfully installed and operated at the Lornex Mine in British Columbia on a 10.4 m (34 ft) mill rated at 9,325 kW (12,500 hp).