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The finding in this research is to reveal the condition in which a reliable DEM solution is achievable in the appli-cation of a SAG mill. The DEM result sheds insight to the design of the grates like the size and total opening area of the slots. It also provides structural optimization on a new type of grate used in a SAG mill.
Discharge grates are designed to retain oversize material and balls in the mill, while allowing slurry and pebbles to move on. In 2015, El Teniente claimed record commercial production of more than 71,000 tons of fine copper at one of the industry's lowest cost levels. An increase in slot size and operational stability increased throughput by 7%.
The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills 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 of a ball mill. Because of the range of ...
Sep 20, 2018· A Discrete Elements Method (DEM) study of load movement within a SAG mill 12,192 × 7620 (40′ × 25′) in normal operating conditions is performed. The purpose is to determine how the geometry of the lifters affects the kinetics of the load inside the mill. Specifically, the changes produced by the incorporation of inclined lifters and spiral or helicoidal pulp lifters to the kinetics are ...
Mar 21, 2007· Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
A SAG mill size of Ø10.97 m x 5.41 m (Ø36 ft x 17.75 ft) EGL was selected for providing the power draw indicated of 8.5 MW at the pinion with the design ore. The mill drive train includes a twin-pinion arrangement powered by two low- speed synchronous motors of 6.7 MW (9,000 hp) each, making these units equal in size to those required to ...
SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING Tony Moon, RTZ ... the mill from the grates in the slot between the grates and the head. The oversize falls ... Screen panel size is 28 by 54 inches. The oversize return tube turns with the trommel These things are not small. The diameter of the trommel for the 34-foot mill is 13.5 feet
Sag Mill Grate Designsag Mill Grate Slot Size Dry Mill Grinder Panasonic How To Install A Ffe Trunnion Of A Sag Mill Ball And Sag Mill Circuits processing plant using dry aerofall sag mill. SAG mills are primarily used at gold, copper and platinum mines with . SAG Mill. Dry grind type. 13 ft. 6 in. (4.2 m) dia. 4 ft. (1.2m) long. 300 hp motor. ...
Nov 07, 2012· (or mill throughput) of AG and SAG grinding mills. … the pebbles flowing back into the mill increase with larger pebble port or grate slot size. » More detailed Teck Resources to invest $685m into 2 BC projects, to increase …
Our grates are made of our special H79 high-strength steel which is tougher and harder than commonly used chrome-moly steels. Our grates made of H79 experience very little slot peening so mill throughput is not compromised. Proven high volume vendor Columbia Steel can provide all the castings required for a complete grinding mill reline.
Jun 06, 2016· Grate design should incorporate an integral radial lifter. This lift on a grate can increase the grate life by up to 50 percent. The slot opening size is determined by the lump size to be retained in the mill. Grate plugging is minimized by proper slot …
sag mill foundations forces. 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) motor. Chat Online ...
Jan 01, 2021· 1. Introduction. Mill filling has a dominant effect on grinding mill performance (Apelt, Asprey and Thornhill, 2001), and therefore, its accurate measurement is vital for modelling grinding mill performance.Measuring filling is also necessary to estimate the composition of the load for mill modelling: rock and slurry for AG mills; rock, balls and slurry for SAG mills; or balls and slurry for ...
Jul 08, 2014· An increase in slot size and operational stability has increased throughput by 7 %. Pebble production increased by 24 % during the first 50 days of operation, while the wear rate decreased from 0.26 mm/day to 0.11 mm/day. Mill availability has increased thanks to …
The SAG mill is an 8.53 m diameter by 4.27 m long (3.81 m effective grinding length) grate discharge mill with a 5,595 kW synchronous motor installed and an air clutch for starting the mill. The mill operates at 76% critical speed with a ball charge of 15% to draw 4,540 kW at the pinion.
Sep 08, 2013· The SAG Mill has a "small" circulation load of oversize given be the 3/8″ trommel screen and the 1/2″ x 1 1/4″ discharge grates. The load of 4″ balls in this SAG is "good" but un-measured. SAG Ball consumption is "average" at 400 g/t while Ball Mill grinding media (3″ balls) usage in 550 g/t.
Aug 10, 2018· A single size category, typically 80% passing, is used in order to simplify the equations. ... and optimizing SAG mill discharge grates and pulp discharge lifter systems. ... that operators have ...
Jul 31, 2020· After a thorough analysis, ME Elecmetal identified slotted grates and semi-grates on the 36' x 19' SAG mill discharge head as a potential area of improvement of the SAG mills' throughput.
Grate slot size variation • SAG Mill internal model: As the slot grate model, this model was developed using volume scanning measurements inside the mill. For this particular purpose it wasn't ...
Jul 31, 2020· African Mining Brief Africa's leading bi-monthly magazine for the mining industry in Africa, bringing you all the best in world class news with a global read, specifically targeted at the mines in ...
AG/SAG mills because the RTD is determined by the rate of breakage of ... function of grate configuration. Slot size, position, and total open area control the passage of slurry,
Feb 01, 2019· The impact of the shape representation used for rock particles in a DEM model of a SAG mill on charge dynamics and energy utilisation is investigated. A 1.8-m diameter pilot scale SAG mill which includes realistic end walls and a discharge grate is used. This size of mill is used for scale-up and design processes for industrial SAG mills so understanding the effect of approximating the ...
This is perhaps best exemplified by mill systems that .... limitation on the smallest ball size is the discharge grate slot width opening. .... showing two different charge levels, with the same mill shell % critical speed:. ... The role of SAG mill grate open area and aperture was evaluated in detail. ... The SAG mill discharges onto two 12' x ...
The load in such a mill typically contains 250,000–450,000 particles larger than 6 mm, allowing correct representation of more than 90% of the charge in Discrete Element Method (DEM) simulations. Most AG/SAG mills use discharge grate slots which are 15 mm or more in width. The mass in each size fraction usually decreases rapidly below grate size.
Mar 02, 2010· Similar to slurry flow-back, the pebbles flowing back into the mill increase with larger pebble port or grate slot size. As the pebbles flow down and slide across the grate slots, they get an equal chance to go back into the mill. Similar to slurry pool formation, pebbles flow-back would increase the quantity of critical size material in the mill.
Trommel's Dimension Slot Size ... • Trommel of 40 feet SAG mill of Collahuasi has an high value of α = 172 m 3/h/m 2. Open Pulp Free Flow by Free SAG 1011 Area, % Flow, ... • Size of SAG Grate: 64 mm • Strangulation of 182 mm • Strangulation of 188 mm • Opposing directors
Jul 14, 2015· Analyze -‐ Demonstra)on of causality C D M A I 6σ Variables X1: Water Quantity X2: Percent solids X3: Power input X4: Speed mill Results of individual regression P value Adjusted R2 0.00 31.9% 0.00 6.0% 0.00 8.8% 0.00 33.8% 0.00 0.8% X5: Slot grate Multiple regression results • The single most signieicant variables are X1-‐Water ...
These included changing the SAG mill discharge grates to a larger opening size, changing the SAG mill operating speed, changing the grinding media ball supplier, increasing the grinding ball size, increasing the SAG mill discharge screen opening slot size and …