sag mill grate design
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sag mill grate design

SAG Mill Liner Design - Mineral Processing & Metallurgy

Jun 06, 2016 · Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill

Semi-autogenous grinding (SAG) mill liner design and ...

Wills and Napier-Munn (2006) describe the design and operation of SAG mills. SAG mills are currently the technology of choice in hard rock milling operations for reducing primary-crushed ore to ball mill feed. In recent years, the trend has been towards larger-sized SAG mills with diameters of 10.4 m

Single Stage SAG AG Milling Design - Mineral Consultants

SAG/AG milling option is ideal for starter projects with significant exploration and expansion potential. Currently a number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the challenges associated with the process design of single stage SAG/AG milling circuits, the design flexibility required to

Optimizing your SAG mill operation - International Mining

Mar 21, 2007 · However, the curved design necessitates redrilling of the mill head and also requires curved grates, which can be quite complicated compared to a simple radial design. The best way to eliminate material problems is to use a grate, peripheral discharge trunnion supported mill or use a grate, open-ended discharge shell supported mill.

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 ...

Optimizing your SAG mill operation - International Mining

Mar 21, 2007 · However, the curved design necessitates redrilling of the mill head and also requires curved grates, which can be quite complicated compared to a simple radial design. The best way to eliminate material problems is to use a grate, peripheral discharge trunnion supported mill or use a grate, open-ended discharge shell supported mill.

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 ...

THE INFLUENCE OF SHELL, GRATE AND PULP LIFTERS ON SAG MILL ...

The charge motion and breakage of particles inside the mill depends on the shell lifters design, while the discharge of ground particles is controlled by the grate and pulp lifters. The limitations imposed by poor grate and pulp lifter design become increasingly apparent with increasing size of ag/sag mills and their operation in closed circuit.

(PDF) Understanding the effects of liner wear on SAG mill ...

The SAG mill disch arges onto a trommel, the coarse material from the . ... function by providing a series of surveys on a mill with the same grate design throughout, and will also allow .

The Selection Design and Application of Mill Liners for ...

> Engineering approaches have highlighted mill performance with mill modelling and the use of improved materials > Liner design ,with the advent of large diameter SAG mills, the issues of design, selection, monitoring and evaluation of mill performance is critical > Mill trajectory modelling can be used to great effect in improving liner design

SOSSEGO SAG MILL - 10 YEARS OF OPERATION AND OPTIMIZATIONS ...

A number of optimization and upgrading measures were taken over the 10 years of operation of the semi-autogenous mill, including changes in the grate area, size and arrangement of aperture, liner profile and rock blasting plan. This work describes the main aspects of the circuit design and the improvements introduced over the first years of ...

Ø Effect of SAG Mill Feed Size Distribution and Ore ...

SAG Mill Speed The design operating speed of the SAG mill was 74% of critical speed (9.02rpm). Operating at this speed during commissioning led to ball breakage due to overthrow of the charge, resulting in direct ball-to-liner impacts. The initial set of SAG mill shell liners were a 78 row, 12 degree

Grinding of Agrium Phosphate Ores in a 3’ Diameter Pilot ...

Jan 10, 2021 · •Close the SAG discharge grates from 0.75 to 0.5 inches. •Install a 1.5 mm screen in closed circuit with the SAG mill discharge to treat Sandy ore. •Speed up the SAG mill to 75% speed since only 56% of the available HP was being used. •Leave the 5/8” trommel, scats will stop when the grates are closed.

Grinding Mills - 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.

InterMet : International Metallurgical Consultants

Improvements made such as mine to mill, types of grates, liners design, water use for trommel and screen washing, sealing ball system, recycling of balls scraps, among others. Challenges to face in the future to improve SAG mill operation, hybrid liners and large balls.

Overflow Versus Grate Discharge Ball Mills: An ...

A set of experimental test work has been carried out in a continuous pilot ball mill of 0.41m X 0.56 m (diameter X length) at different mill speeds, percent solids and discharge mechanism. The results of study on material flow through a grate discharge tumbling mill verses an overflow tumbling mill are presented to emphasize the effect of ...

The Selection and Design of Mill Liners - MillTraj

mills in the older plants that had many mills in parallel. In fact this is generally still the case in the multi-stream plants, where mill liner design and selection is only tackled on a cost consumables basis. However, the gains to be had through good liner design and selection are just as great as on the large SAG mills.

Mill power draw models - SAGMILLING.COM

The design of mill liners and SAG mill discharge grates will have a large effect on how efficiently the mill operates and the circuit throughput. All models generally assume that a mill is fitted with "efficient" liners and that the grate design neither limits passage of pebbles (and pulp) nor permits re-circulation of pulp back into the mill.

39 Greg Lane Comminution Circuit Design For The Constancia ...

39 Greg Lane Comminution Circuit Design for the Constancia Project - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Scribd is the world's largest social reading and publishing site.

Modelling of the Performance of AG/SAG Mills

Transport of slurry through the mill is described by a function which relates the hold-up of slurry, grate design, grate open area and mill speed to the volumetric discharge rate through the grate (Morrell and Stephenson, 1996): Jp = k Q0.5 g-1.25 A-0.5 f0.67 D-0.25 (7) where. Jp = fractional slurry hold-up. D = mill diameter (m)

Grinding of Agrium Phosphate Ores in a 3’ Diameter Pilot ...

Jan 10, 2021 · •Close the SAG discharge grates from 0.75 to 0.5 inches. •Install a 1.5 mm screen in closed circuit with the SAG mill discharge to treat Sandy ore. •Speed up the SAG mill to 75% speed since only 56% of the available HP was being used. •Leave the 5/8” trommel, scats will stop when the grates are closed.

New SAG Mill Model for Better Mine-to-Plant Planning

constant as an empirical function of the open area, grate design, mill speed, charge volume and pulp lifter specifications. Menacho and Chávez (2008) reported a slurry transport model in SAG mills by using the porous media fluid transport theory. Tupper, Govender, Mainza and Neville Plint (2013) reported a

EXPERIENCES IN SAG MILL OPERATION

4. Operational data of current large capacity SAG mills. 5. Description of the SAG mill circuits from the concentrators Antamina Cerro Corona Antapaccay Chinalco Constancia Las Bambas and Quellaveco 6. Description of the deviances occurred during SAG mill operation. Blockage of grates Cracking of bolts, liners and grates Flowback and carry over

Slurry flow in mills: grate-pulp lifter discharge systems ...

Abstract. Pulp lifters, also known, as pan lifters are an integral part of the majority of autogenous (AG), semi-autogenous (SAG) and grate discharge ball mills. The performance of the pulp lifters in conjunction with grate design determines the ultimate flow capacity of these mills. Although the function of the pulp lifters is simply to ...

SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING

SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING Tony Moon, RTZ What I’d like to talk about is probably one of the nastiest bits of mill design for a grinding circuit, and that is the choice of what do you use on a SAG mill discharge? Do you use ... the mill from the grates in the slot between the grates and the head. The oversize falls

Autogenous and Semi-Autogenous Mills | FLSmidth

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.

SAG MILL Grates and Pulp Lifter Hydrodynamic simulation ...

Jan 13, 2018 · cc

What's the Difference Between SAG Mill and Ball Mill ...

Nov 26, 2019 · 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 ...

Grate Discharge Sag Mill - factjeugdnoord.nl

Sag mill discharge screens-trommel vsibrating tony moon, rtz what id like to talk about is probably one of the nastiest bits of mill design for a grinding circuit, and that is the choice of what do you use on a sag mill discharge do you use vibrating screens or trommel screens in grate discharge type ball mill, a grate

China SAG and AG Mill Grate Mill Liner factory and ...

As a casting foundry, H&G Casting also has own SAG Semi-Autogenous Grinding Mill Liner and AG Autogenous Grinding Mill Liner design. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered.

Increased production and energy efficiency for optimized ...

Apr 24, 2014 · Conditions such as different blast designs, primary crusher setting, SAG mill grate design, SAG mill ball charge level, ball mill operating conditions, changes in classification with hydrocyclones, use and operation of recycle/pebble crushers were all

Grinding Circuit Design for Adanac Moly - SGS

design of a plant for Adanac Moly Corp. to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG

AG & SAG Mill for Mineral Processing Wet & Aerofall SAG ...

In this case, the SAG mill design can do that. In general, the SAG mill manufacturers will control the addition amount of medium such as steel ball at 2-8%, so that the capacity of semi SAG mill to process materials can be increased by 10-30%. The SAG mill liners wear will increase by 15% due to the impact of medium such as steel ball during ...

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