Sag Mill Grate Slot Size

SAG MILLS OPTIMIZATION: IMPLEMENTATION AND …

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

Improving Autogenous/Semi-Autogenous Grinding …

grate slots, they get an equal chance to go back into the mill as illustrated in discrete element method (DEM) simulation of 36 ft SAG mill pulp lifters shown in Figure 5. Solid particles and coarse pebbles also flow-back through the grates along …

Ball Mill Discharge Screen | Crusher Mills, Cone Crusher ...

MILLS (SAG,AG, ROD, BALL, PEBBLE) – Bateman Engineered … This is a screen grate installed near to the discharge end of the mill which has slots … in ball mills. Lubrication Bateman mills are trunnion supported and

minerals fuller traylor sag sag mills

2014613 About sag mill grate slot size related information sag mill grate slot size increasing sag grinding capacity at goldex by secondary circuit . SAGMill Work Optimization . 2015102 SAG mills are presently one of the most widely used alternatives in the field of mineral size reduction as a result of their advantages such as higher .

difference between of sag mill and ball mill

What is the difference between a SAG mill and ball mill? 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 with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9] Attrition between grinding balls and ore . Read More

Improved Relationships for Discharge in SAG/AG Mills

of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in order to advance the understanding in a meaningful way, a more mechanistic ...

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.

sag mill ball feeder - ataFinch

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW

ERIEZ Grate Magnets

SB-200DD. ERIEZ ® Our full line, from simple tubes . to fully automated tramp metal removal designs. Grate. Magnets. TUBE MAGNETS • P-GRATE • BA GRATE • WING/DRAWER GRATES • GRATE-IN-HOUSINGS • ROTA-GRATE

Mill Grates Help Boost Production at Codelco | E & MJ

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%.

(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 …

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).

Gearless mill drives - ABB

• 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 ...

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 Grinding Circuit Design - 911metallurgist

PT Freeport Indonesia, and others with 11.6-m mills) have installed SAG mills of 20 MW. Gearless drives (wrap-around motors) are typically used for large mills, with mills of 25 MW or larger having been designed. Several circuits have …

Ball mill - Starkey Associates Grinding Design and Process ...

Thus, the size of the slots may be varied depending on the requirements for the SAG mill, with very small slots e.g. narrower than ¼ inch, being prone to plugging during use. Slot widths can vary from ¼ inch to a maximum of 4 inches, depending on the application and the diameter of the cylindrical grinding chamber being used.

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 ...

'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.

(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 ...

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.

(PDF) Slurry flow in mills with TCPL — An efficient pulp ...

The degree of slow- tant component of grate discharge mills (GDM). The back depends on the size and design of the pulp lifters. GDM include autogenous (ag), semiautogenous (sag) The ideal slurry flow in a typical grate discharge mill is and grate discharge ball mills.

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.

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.

SAG Mill Liner Design - Mineral Processing & Metallurgy

In cases such as autogenous mills at the Empire Mine, all the pulp discharges through ports, approximately 3″ square, with no slots in the "grates." …

AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

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 ...

Using DEM to model ore breakage within a pilot scale SAG mill

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.

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 ...

INFERENTIAL MEASUREMENT OF SAG MILL …

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).

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 ...

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.