SAG mills semi autogenous grinding mills . SAG milling extends itself to many applications due to the range of mill sizes available They can accomplish the same size reduction work as two or three stages of crushing and screening a rod mill and some or all of the work done by a ball mill SAG mills are also an optimum solution for wet grinding since crushing and screening in …

autogenous grinding (SAG) mills, or ball mills. The most important components of a GMD are the following ones: The stator is a massive electro-mechanical structure built around the grinding mill, hence its alternative names "wrap-around motor" …

synchronous ring motor (wrap-around motor) is installed concentrically around the mill. The mill shell carries the rotor poles which are individually mounted to form an even air gap with the wrap around motor. The number of poles (up to 76 poles on larger SAG mills) as well as the way the poles are mounted depends on the size of the motor.

SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

SAG Mill. Product description. The SAG mill also kown as medium-free grinding mill. The ore from the stope or the coarsely crushed ore can be directly fed into the mill. The biggest speciality of the SAG mill is that the crushing ratio is large, …

The project was part of a major intervention at two grinder lines, where we repair the concrete, replace all anchor bolts, inject resin into the foundation, and epoxy grout different components on two SAG mills (8,5 m ø x 3,8 m @ 11 rpm) and two Ball mills (5.2 m …

what is lrs in ball mill - verhuur-doms.be. Advantages of SER drives for SAG mills Friday, December 19, 2014 For large mills requiring variable speed, the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW. Above 16MW, the gearless drive (cyclo-converter) is typically used because gearboxes and pinion ...

Vibration Sag Mill Motor NDE Bearing | AMP Maintenance Forums. Vibration Sag Mill Motor NDE Bearing. At our mine we have an issue with vibration at the Sag Motor NDE bearing. The bearing is a journal white metal bearing. The motor has been running for about 14 months now. The vibration at the NDE bearing was around 2mm/sec.

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).

Gearless mill drives - Grinding ABB ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) m

Gearless Warp Around SAG Mill. For almost a decade now, very good operating experiences have been gained with a total of 28 gearless ring …

Rod, Ball, Grinding Mills, Allis Chalmers ball mills, Mining - Know More Rod, Ball, Grinding Mills, Allis Chalmers ball mills, Mining, Click to see Photo, 4200 x 6800 Morgardshammar Sag Mill: Complete with 1540 KW DC Drive -.... Grinding Mills for Sale | Grinding Mills Equipment - …

Sag/AG Mill Liners&Mill Head and Shell Liners. US $ 3,500-5,500 / Ton FOB. MOQ: 1 Ton. Since 2015. Main Products. Mining Machinery, Cement &Lime Production Line, Large Casting&Forgings, Rotary Kiln, Vertical Mill, Ball Mill, Roller Press, Crusher, Ore Dressing Mahcinery, Metallurgical Equipment.

AG Mill&Autogenous Mill&SAG Mill: 1.CITICIC can produce below 12m AG Mill&SAG Mill 2.AG Mills&SAG Mills:2.4x1.2~13x4.0m ZTIC can produce below 12m autogenous mills(AG Mill) and semiautogenous mills(SAG Mill).autogenous / semiautogenous mills(AG Mill &SAG Mill) are utilized to grind run-of-mine rock or primary crusher discharge.especially medium hard and …

method of driving SAG mills, Ball mills and other rotating elements. Several thousand grinding mills have been manufactured and have been in operation for the last century. The gearless drive came into the minerals industry in 1980 and as per their reference lists, Siemens have approximately 60 installations and ABB have approximately 85.

SAG mill trommel Mill braking system Hydraulic jacking system Portable hydraulic power unit. Motor and Drive 26,000 HP (19.4 MW) Siemens wrap-around drive motor 60 Hz synchronous Gearless, wrap around Differential protection

With our SAG mill running at 65.4% critical speed (mill @ 8.7 RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately 1.2 MW of slip energy; the power ...

China Mineral Grinding Rod Mill AG Sag Mill for Coarse Material for Grinding Ores, Sand Making, Stones, Find details about China Ball Mill, Grid Ball Mill from Mineral Grinding Rod Mill AG Sag Mill for Coarse Material for Grinding Ores, Sand Making, Stones - Nanjing Sinonine Heavy Industry Science & Technology Co., Ltd.

Many large mills around the world (Esperanza with a 12.8 m mill. Cadia and Collahuasi with 12.2-m mills, and Antamina. ndida # IV. PT …

And now ball mill is one of CIC's major products widely selling to both China domestic and the international market. Working Principle: Motored by the power and the shell of the ball mill is transmitted by the girth gear. During the rotating of the shell, materials and grinding medium ball are moving with the grinding chamber.

1 x SAG Mill & Siemens Motor. 1 x SAG Mill & Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38' x 26') (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) …

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 semiautogenous (SAG) …

Gearless mill drive system (GMD) 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 (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust ...

Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop ...

explained that in the past, grinding mills operating between 18MW and 28MW required a large electrical wrap-around motor, known as a gearless mill drive (GMD). The QdX4 mill drive system is an alternative option to the GMD. Until now, the gear-driven solution for large SAG and ball mills was limited to 18MW.

AG mill (autogenous mill) is a medium-free mineral grinding equipment. The raw ore and the coarsely crushed ore are directly fed into the AG mill. No other medium is involved in grinding. Only the impact between the ore is used for self-grinding. The ore larger than 100mm in the AG mill plays the role of grinding medium.

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Search through huge mining inventory of used Ball mills, Sag mills, Pebble mills, grinder mills for sale today and ready for shipping! Allis-Chalmers, , Hardinge, Fl and more! All sizes and horse powers available!

Material is crushed underground, stockpiled and then conveyed to a 6.1 x 4.1-m SAG mill. It is powered by a 2.3-MW motor and runs with 8%-12% of the mill's volume filled with 125-mmdiameter steel grinding balls. Incoming ore varies in zinc and lead levels and hardness. The SAG mill therefore operates at variable speeds.