2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the mine-to-mill (M2M) paradigm, a practice that has …
Note that modern wrap-around (gearless) mill drives do a software correction to report mill motor output power (which is the same as shell power). Therefore, new gearless mill drives do not require any correction when comparing DCS power measurements to model power draw predictions. Power predictions are only valid below motor rated speed
sag mill wrap around motor. mill with 1,500 HP Westinghouse synchronous motor through Fawick model 42VC1200,. gearless wrap around motor drive, 50 … More; The Large Wrap Around Motor Foe Ball Mill - … Ball mill - Wikipedia. A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing Ball mills rotate ...
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters. In order to obtain the optimal operation parameters of a SAG mill, in this paper, the …
SAGDesign™ testing measures the macro and micro ore hardness by means of a SAG mill test and a standard Bond Ball Mill Work Index test on SAG ground ore. ... 60 0.1340 Wound Motor Gearless 61 0.1370 Wrap-around Motor 62 0.1400 63 0.1430 Code Eff. Loss 64 0.1460 122 1.30 65 0.1490 113 1.10 66 ...
Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having been designed. Several circuits have single-line design capacities exceeding 100,000 TPD. A large SAG installation (with pebble crusher product combining with SAG discharge and feeding screens) is …
This study supports the use of mill acoustic sensing technique to understand different grinding conditions in AG/SAG mills for improved and continuous process monitoring, energy-efficient milling ...
along the longer mills incr ease s, as found out in the application to the first 40 foot SAG mill at Cadia (Hart e t al., 2001 ). The obvious alternat ive is to prevent the larger rocks from ever ...
semi-autogenous grinding process by dynamically modeling the SAG mill-pebble crusher loop to improve the SAG mill throughput. Cleary [8–10] studied the effect of rock particle shape on the dynamic filling and energy utilization in a SAG mill and analyzed the operation status of a SAG mill under different collision conditions through the coll ...
2 x FLS Ball Mills (excl. Motor/Drive) For Sale/Re-Assignment Mill Details Type of Mill FLS Ball Mills (set of 2) Mill Dimensions 7925 x 12344 mm (26'x40'6") (Diam x L) Default Mill Speed 11.41 RPM Mill Speed 10.65 to 12.17 RPM Liners Metal/Rubber - Excluded Mill Drive Motor Type Wrap Around GMD Mill Drive Motor Size 16,400 kW (21,993 hp) ...
in the semi-autogenous grinding process by dynamically modeling the SAG mill-pebble crusher loop to improve the SAG mill throughput. Cleary [8–10] studied the e ect of rock particle shape on the dynamic filling and energy utilization in a SAG mill and analyzed the operation status of a SAG mill under di erent collision conditions through …
SAG Mill Control: It Shouldn't be that Hard. An economically appealing method for improving operations is available without the capital expense — get more out of a mill by applying the advanced control capabilities in the existing plant control system. By Andrew Thornton. The newest mining-class bulldozer to enter the market is 's ...
Contribute to ziyoujudian/fr development by creating an account on GitHub.
SAG mills use a combination of steel balls and rock particles as grinding media, while AG mills use only the ore itself. Both types of mills are used for grinding ore in mineral processing operations, but SAG mills are larger in size and can grind larger quantities of ore. AG mills, on the other hand, are smaller and are typically used for ...
mentioned some case studies of using good liner designs. For example, the initial SAG mill liner was installed using Hi-Hi with a 6. o . contact angle. Mill throughput increased by 11% after the face angle had been altered to a 17. o. angle and then to a 30. o. angle. Currently, the large face angle (typically 20. o . up to 30. o
Our GMD eliminates all mechanical components of a conventional mill drive system, such as ring-gear, pinion, gearbox, coupling, motor shaft and motor bearings: By mounting the rotor poles directly onto the mill, the mill itself …
"wrap-around motor" or "ringmotor". The motor rotor is composed of individual poles mounted on the mill flange. The number of poles is based on the required speed of the …
Due to its strong lifting capacity and excellent grinding performance, the trapezoidal liner is widely used in the SAG mill. The structure of the trapezoidal liner is shown in Fig. 1, the main dimensions are: dip angle (tau), length of the top edge (L) and height (h).Dip angle (tau) determines the trajectory of the mediums in the SAG mill, …
TABLE 1 Comparison of RoM and SAG mill operating regimes AG/SAG South African RoM Speed, % critical 70- 80% 75 -90% Charge Filling, % total mill volume 20 - 30% 35 - 45% Bali filling, % total mill volume 4-15% 15 - 35% Internallength 3-5m 5 -12m Aspect ratio, diameter/length 0.7 -2 0.5 - 0.8 Recycle stream Trommel oversize Cyclone underflow ...
This paper describes advances in the operation and control of new SAG mill installations in Australia. ... Both SAG mills can also be oper ated at 0.01 rpm via the ABB wrap . around motor control ...
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).
SAG and ball mills are generally accepted as the largest power consumers in a mining and mineral processing operation and can be 80% of total electrical energy consumed at a specific power consumption of around 20kWh/ton. Their function is to effect size reduction of rock in order to liberate the target metal compound or compounds trapped in
(also called wrap-around motor or ring motor) are directly installed on the pole flange of the mill shell, turning the mill body into the rotor. The stator is then wrapped around the …
• 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 ...
A total of 120 t of Cristalino ore was prepared and sent to CIMM, where it was crushed and screened prior to grinding tests. The processing equipment included a 1.83 m (8′) diameter by 0.61 m (2′) length AG/SAG mill equipped with a 20 kW motor, a cone crusher, a 0.91 m (3′) diameter by 1.22 m (4′) length ball mill equipped with a 15 kW ...
Gearless Warp Around SAG Mill. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring motor drives in …
