Hydraulic Design Manual: Storm Drain Inlets
Curb opening inlets are useful in sag and on-grade situations because of their self-cleansing abilities and hydraulic efficiency. ... Slotted drains consist of a corrugated pipe with an extended slot, or throat, at the top (see Figure 10-5). ..., an appropriate safety factor should be applied to the inlet size. For grate inlets in sags, the ...
Mill drives: the desire for increased power and the ...
SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option
Turbo Pulp Lifter (TPLTM) - An Efficient Discharger to ...
The SAG mill is 26' diameter x Proceedings of the 39thAnnual Canadian Mineral Processors Conference – 2007 206 12'3" EGL and powered by 4,500 HP motor driven by a variable speed LCI drive that can control the mill speed from 36% to 80% of critical speed. The general flowsheet of the circuit is shown in Figure 9.
jaw crusher operation of a sag mill pdf
SAG is an acronym for semi-autogenous 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%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill ...
INFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS IV ...
estimated utilising the SAG mill grate size and discharge screen aperture sizes and the Rosin-Rammler size distribution function, which has been selected for its convenience and since it "has been found to fit many size distributions very well" (Napier-Munn et al.,1996).
Simulation of Material Transport in a SAG Mill with ...
12%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 …
(PDF) Relationship among operational parameters, ore ...
grate slot size could not solely control the mill product size ... an increase in ore hardness corresponds to an increase in feed size. Hard ore grinding in the SAG mill resulted in finer products ...
Discharge Grates - Polycorp
The rubber grates have tapered slots to minimize the plugging with near size particles. Rubber / PolyStl™ grates are extensively used in AG / SAG and Primary ball mills. Polycorp regularly supplies rubber and PolyStl™ grates for mills up to 40 ft in diameter. PolyStl™ Grates. PolyStl™ Grates are suitable for AG / SAG mill applications ...
Toward a Simple Approach Determining Single Stage SAG mill ...
In this case is 13,200 µm, which is the size below typi cal grate . size of 19 mm. ... (SAG) mills it was found necessary to have mill power equations …
TECHNICAL NOTES 8 GRINDING R. P. King
LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...
SAG Mill Ball Size Evaluator | Evaluation Factors ...
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.
How a Grate Discharge Ball Mill Works
How a Grate Discharge Ball Mill Works. Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill turns/rotates the slurry is "pumped" out and discharged.
Optimizing your SAG mill operation - International Mining
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.
Grinding Mill Liners and Wear Parts - Columbia Steel ...
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.
Contech Slotted Drain - Contech Engineered Solutions
intercepted by another slot-on-grade or a slot-in-sag. Because of the larger diameter pipe typically used, i.e., 15" and 18", Contech Slotted Drain has a much larger system capacity than the competitors' systems. Q given as 0.04 ft 2. Slot-in-sag When Slotted Drain is installed in a sag or at a low point in
sag mill ball size 125mm - atd-couvreur.fr
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 …
US9527087B2 - Real-time monitoring system to determine ...
A real-time monitoring system to monitor the wearing in the thickness of the ribs ( 5 ) of a grate ( 1 ) of a SAG mill ( 9 ) due to the abrasive action of the ore pulp residing inside the mill and due to the action of the grinding elements during the operation, and which in certain cases also generates obstruction of the slots ( 4 ) due to the jamming of said grinding elements inside the …
What's the Difference Between Ball Mill, Rod Mill and SAG ...
Ball mill: When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill: The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size is relatively larger.
(PDF) Optimisation of the Sossego SAG mill | Mauricio ...
SAG mill throughput as a function of grate open area As shown in Figure 2 the grate open area has a strong effect on Sossego SAG mill throughput. The nominal capacity of the circuit should be achieved with a combination of 13.5% ball charge and …
Summary of Comminution Model Types
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 ...
Optimizing your SAG Mill | Mining Surplus
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.
INCREASING SAG MILL CAPACITY AT THE COPPER …
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 initiating the overall expert system into the control strategy.
Ø Effect of SAG Mill Feed Size Distribution and Ore ...
design processing rates of the Cadia Hill SAG mill circuit and that could be easily manipulated were; SAG Mill Load Ball Charge - SAG mill power draw was guaranteed by the vendor at 13% ball charge and 30% total volume to be 20.96MW for the 40 foot diameter SAG mill. In practice this power draw was never achieved I-14 (Dunne et al 2001).
Using DEM to model ore breakage within a pilot scale SAG mill
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. This scale of DEM model is now within the possible range of standard workstations running an efficient DEM code.
Major Mines & Projects | Horne 5 Project
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 ...
CONTINUOUS IMPROVEMENT AT SENTINEL (WITH REMOTE …
This tight correlation shows that the circuit is limited by the grind size selected and is not SAG mill limited when aided by secondary crushing. The available power is well utilised and balanced with the amount being secondary crushed. If the circuit was SAG mill limited, less power would have ... Train 1 T1 SAG(radial) grate slots change from ...
What's the Difference Between SAG Mill and Ball Mill ...
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
Key considerations when selecting a mill lining system
SAG mills usually have a larger diameter than length and are used to reduce large feed size ore (typically ~300mm) down to ~3mm, often for further grinding in a secondary process. Ball mills are smaller in diameter than length and can be used in either primary, secondary or tertiary grinding applications to reduce material from ~20mm to very ...
Major Mines & Projects | Sukari OP Mine
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.
Overflow VS Grate Discharge Ball or Mill - Why Retrofit
Grate Discharge Ball Mills have shown 25% to 45% more tonnage ground and a substantial reduction in power consumed per ton of material compared size for size with overflow mills. To illustrate the characteristics of various type mills we have shown the types of discharge for rod mills and ball mills. There are essentially four types of rod mill ...
Choosing the Correct Mill Screen - Particle Size Reduction ...
Choosing the right conical mill screen for your application is crucial in achieving your desired particle size range and enhancing the performance of the mill. There is a choice of Round Hole, Grater Hole, Square Hole, Slotted Hole and Diffusion Bonded mill screens. Read our guide on choosing the correct screen.
SAG MILL DISCHARGE SCREENS-TROMMEL vs. …
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
Grinding Circuit - an overview | ScienceDirect Topics
The crushed pebbles fall directly onto the SAG mill feed belt and return to the SAG mill. 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.
's innovative grinding technology at Codelco ...
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 elimination of pinning and breakage.