20' EGL SAG mill, a Raptor 900 pebble crusher and two 24' x 39'6" ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From startup, the mill struggled to meet the required production rates. Over time, a major initiative that involved
WhatsApp: +86 18838072829As one of the machines widely used in mining, a semiautogenous 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 discrete element method (DEM) is used to simulate the ...
WhatsApp: +86 18838072829operating in closedcircuit with classification screens. The grinding circuit consists of a semiautogenous (SAG) mill with a pebble crusher followed by two ball mills. The SAG mill is unusual, with a low aspect ratio similar to the ball mills. The ball mills currently produce a final grind size of P 80 of 75 microns (µm).
WhatsApp: +86 18838072829Toromocho Copper Mine Expansion, Morococha, Peru SAG Mill Components Mineral Processing Metallurgy. Figure 11: Slice model of a 36 in. SAG mill with particles shaded by size (top) and velocity (bottom) with darker shades being slow moving and lighter shades faster The model prediction of power drawn is 778 kW/ m mill slice, so for a typical 6 m long SAG mill the total power drawn is ...
WhatsApp: +86 18838072829The SAG mill pinion energy is determined from the SAGDesign™ testwork results as follows : W SDT = revs (16,000 + m s)) / ( m s) where : W SDT = AG/SAG Specific Pinion Energy from a F 80 of mm to a T 80 of mm, kWh/ton ground revs = Cumulative number of SAG test mill revolutions to 80% passing m s = SAG mill feed sample ...
WhatsApp: +86 18838072829The processing plant operates with a standard SABC comminution circuit, and was the first to use the largest domestic Φ × m SAG mill ('diameter' represents nominal diameter, and 'length' of the mill represents the effective grinding length inside the end liners and discharge grates), Φ × m overflow ball mill and ...
WhatsApp: +86 18838072829AG/SAG is short for autogenous mill and semiautogenous mill, it combines with two functions of crushing and grinding, uses the ground material itself as the grinding media, through the mutual impact and grinding action to gradually reduce the material size.
WhatsApp: +86 18838072829along 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 ...
WhatsApp: +86 18838072829Figure 2: Pilot Plant kg/hr Vs Charge % by Volume This data is indicative of trends that were happening in the 3ft. diameter SAG pilot mill. They have not been proven in large commercial scale mills. Because the grinding operation could be viewed through the open end of the SAG mill, it was evident that maximum throughput occurred
WhatsApp: +86 18838072829Early SAG mill designs using gear drives were limited in the amount of power that could be applied to the pinions, MPa (5000 hp). The exception to this design was the Hibbing taconite operation. It used MPa (6000 hp) motors to drive a 1Imdiam x long (36ftdiam x 15 ft) autogenous mill. However, recent SAG mill designs now ...
WhatsApp: +86 18838072829Tracking the mill performance showed that the mill power consumption decreased from to kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...
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WhatsApp: +86 1883807282932 x 12 ft ( x m) Hardinge Koppers ( ) SAG Mill 6800 HP. 32 x 12 ft ( x m) Hardinge Koppers SAG Mill 6800 HP (5100 kW) Two GE wound rotor induction motors: 3400 HP 710 RPM 4000 V Includes motor starter Includes lube system and temperature plant's enrichment scheme includes two types of grinding mills a SAG mill (semiselfgrinding) and a BALL mill (ball ...
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WhatsApp: +86 18838072829plates or be rolled square universal mill plates Plates frequently are referred to by their thickness and width in inches as plate 1/2 inch x 24 inches The length in all cases is given in الدردشة الآن
WhatsApp: +86 18838072829By December 2004 Cortez Mines realized that the SAG mill is drawing approximately 236kW less power than before while maintaining the same level of production. In the first month there was extreme cycling and operators had to learn more. Now the power consumption is kWh/ton lower than before. The actual SAG mill power draw is 230370 kW ...
WhatsApp: +86 18838072829AG Pilot Plant 200 Various >50,000 >50,000 Continuous Y Y Labscale HPGR BQ 4007 360 Lockedcycle Y Y SPT N/A BQ 10 7 Lockedcycle Y Y HPGR Pilot Plant 50 Various >2,000 >2,000 Continuous Y Y Bond Rod Mill Any 15 10 Lockedcycle Y Y Bond Ball Mill Any 10 5 Lockedcycle Y Y
WhatsApp: +86 18838072829Dunne et al. (2001) state the initial design of the Cadia Gearless Mill Drive called for 20 MW at a RPM rated speed. The tent diagram assuming volumetric loadings of 13% balls and 25% total ...
WhatsApp: +86 18838072829article{osti_922135, title = {Improving Energy Efficiency Via Optimized Charge Motion and Slurry Flow in Plant Scale Sag Mills}, author = {Rajamani, Raj K}, abstractNote = {A research team from the University of Utah is working to make inroads into saving energy in these SAG mills. In 2003, Industries of the Future Program of the Department of Energy tasked the University of Utah team to ...
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WhatsApp: +86 18838072829Principle of SAG Mill operation SAG mill. SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also 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' () in diameter, powered by a 28 MW (38,000 HP ...
WhatsApp: +86 18838072829AG Pilot Plant 200 Various >50,000 >50,000 Continuous Y Y Labscale HPGR BQ 4007 360 Lockedcycle Y Y SPT N/A BQ 10 7 Lockedcycle Y Y HPGR Pilot Plant 50 Various >2,000 >2,000 Continuous Y Y Bond Rod Mill Any 15 10 Lockedcycle Y Y Bond Ball Mill Any 10 5 Lockedcycle Y Y
WhatsApp: +86 18838072829energies Article Operation Analysis of a SAG Mill under Di erent Conditions Based on DEM and Breakage Energy Method Qiyue Xie 1, Caifengyao Zhong 2, Daifei Liu 1,*, Qiang Fu 1, Xiaoli Wang 3 and Zhongli Shen 1 1 School of Electrical Information Engineering, Changsha University of Science Technology, Changsha 410114, China; qyxie168 (); fuqiang0812 ();
WhatsApp: +86 188380728291. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is used to grind the pieces of raw material into. powderlike structures. 3.
WhatsApp: +86 18838072829Improving Energy Efficiency in SAG Mills PilotScale SAG Mill Facility Will Help to Optimize Charge Motion and Slurry Flow in PlantScale SAG Mills Reducing Energy Consumption The mining industry operates approximately 80 semiautogenous grinding mills (SAG) throughout the United States. Both mine and mill site variables determine SAG ...
WhatsApp: +86 18838072829When the author ran the ft (168 cm) diameter Nordberg Pilot Plant SAG mill for Art MacPherson's new SAG mill design projects in, the standard loading was "2 in. (51 mm) below the lip of the feed trunnion", or 26% load (Rexnord, 1976). It was known then to be the best and proper load at which to run a SAG mill and this has ...
WhatsApp: +86 18838072829These two types of mills are filled with varying compositions of grinding media. SAG mills contain balls of up to 150mm in diameter that occupy 5%18% of mill chamber volume. Ball mills, conversely, contain grinding media up to 50mm in diameter, occupying between 25% 40% of mill chamber volume. To effectively reduce material size, each type ...
WhatsApp: +86 18838072829SAG Mill Components. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of ...
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WhatsApp: +86 18838072829A 42ft SAG mill was designed and built for Minas Congas mine in Peru, but never installed. "The rise from 34 to 40ftdia. SAG mills was quick, but then stalled," Filidore explained. "Today, we're seeing a lot of 28ft ball mills. Last month, we sold six 28ft ball mills and six 40ft SAG mills.
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WhatsApp: +86 188380728295 to 50 TPH SAG Mill. Starting as small as 13 feet (4 m) in diameter on 330 HP and as large as 24′ ( m) in diameter on 3,300 HP, the 911MPE Semi Fully Autogenous Mills tumble crushed ore without iron or steel grinding media. They are used when the crushed ore pieces are hard enough to perform all the grinding.
WhatsApp: +86 18838072829A 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 m (8′) diameter by m (2′) length AG/SAG mill equipped with a 20 kW motor, a cone crusher, a m (3′) diameter by m (4′) length ball mill equipped with a 15 kW ...
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WhatsApp: +86 18838072829Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry (water and finer particles) and pebbles (20100 mm). Single stage AG/SAG mills ...
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