STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL …

STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL PERFORMANCE Malcolm Powell Head Comminution Group, Mineral Processing Research Unit, ... discharge grate (18mm round holes extending to near the centre of the grate), and pebble ports (75mm round holes). ... removed, to compare the mill performance. The crusher now operated

Understanding the Effects of Liner Wear on Semi-autogenous ...

The effect of liner wear on SAG mill performance has gained much attention in recent years. It is commonly observed that the three key performance criteria of SAG milling; throughput, power and product size all improve as the liner wears. The increase in throughput is generally ascribed to the increase in the grate apertures and...

Total primary milling cost reduction by improved liner design

The liner design has a huge impact on the mill performance and the total milling cost. The incorrect liner design for a ... Overflow vs. grate discharge The type of discharge is an important factor when it comes ... Effect of the discharge modification on the liners Figure 10. Effect of the discharge …

1-way-coupled pilot SAG mill draft1 - publications.csiro.au

discharge grates, along the pulp lifters and its discharge from the mill is an important contributor to the efficiency of the grinding process within a SAG mill. Poor transport of finer ground material can adversely affect grinding leading to excess energy consumption and over-grinding of fine material.

SAG Mill Liner Design - Mineral Processing & Metallurgy

To a more significant degree than in other comminution devices, SAG Mill Liner Design and Configuration can have a substantial effect mill performance. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered.

Optimizing your SAG mill operation - International Mining

The commercially viable and industry accepted alternate is a grate discharge trunnion supported mill or a grate discharge shell supported mill using pulp lifters. The only way to eliminate the problem of flow-back and carry-over of slurry and pebbles is by optimizing the design of the discharge arrangement.

Mineral movement simulation through the grates and pulp ...

Mineral movement simulation through the grates and pulp lifter in a SAG mill and evaluation for a new grate design using DEM ... grates play a preponderant role in the good performance of mill. Govender et al. (2013) studied the ... slots and a total evacuation area of 5.84 m2. The discharge transport ducts have been included in detail

DISCRETE ELEMENT METHOD MODELING OF PULP LIFTER …

DISCRETE ELEMENT METHOD MODELING OF PULP LIFTER PERFORMANCE Pengbo Chu Department of Mechanical Engineering McGill University Montreal, Canada August 2011 _____ A thesis submitted to McGill University in partial fulfillment of the requirements for …

The effect of grate design on the behaviour of grate ...

Mori et al. (1967) measured hold-up of dry solids in a pilot grate-discharge mill and found that the %open area in the grate had very little effect on hold-up (presumably because the mill was a relatively long one, with length/diameter ratio of 3.6, so that the end-effect provided by the grate was small).

Optimization of mill performance by using - SciELO

mill performance could become worse or better by putting in a new shell liner. Data from pilot plant test work illustrates the influence of the shell lifting effect on the grind for a primary grinding duty. Figure 5 shows the evolution of the mill discharge product size in relation to the lifting effect of the liners.

TECHNICAL NOTES 8 GRINDING R. P. King - Mineral Tech

Grate discharge Dry Grate discharge Wet Overflow discharge Wet Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery Reference Manual, Rexnord Process Machinery Division, Milwaukee, 1976 The effect of varying mill speed on the power drawn by the mill is shown graphically in Figure 8.4

Performance characterisation of AG/SAG mill pulp lifters ...

The pulp lifter is an integral component of autogenous (AG) and semi-autogenous (SAG) grinding mills as it controls the throughput, performance and efficiency of mills. The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter.

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 vibrating screens or trommel screens? What many of you probably don't realize is that at

Comminution - CEEC (Coalition for Eco Efficient Comminution)

The Coalition for Energy Efficient Comminution (CEEC) has been established and is supported by a broad range of mining sector companies keen to accelerate awareness, knowledge transfer and, by implication, improve energy and cost outcomes in the substantive area of comminution.

MINERAL PROCESSING - bradken.com

Mill Liner Life Performance. 30 25 20 15 10 5 0. DE Middle Liner DE Middle Pulp Lifters DE Grate DE Outer Pulp Lifters Discharge Cones Months. BRADKEN COMPETITOR. The Discharge End (DE) pulp lifter is a critical component of autogenous (AG) and semi-autog-enous (SAG) grinding mills, having a significant impact on the throughput, efficiency and ...

Mill Lining - My CMS - Tega Industries

Tega WearSym is used to predict mill liner wear rate, remaining liner life & effect on mill performance. This helps mill operator to plan the changeover schedule & inventory management. Tega WearSym has been customized for Rubber Mill Liner, Rubber metal composite mill liners as well as TEGA Combi Liner.

Exercise 5 in Demo: New Discharge Grates in SAG mills ...

May 08, 2015· Pegging of the discharge grates in SAG mills often occurs and this will result in a drop in throughput. The effect of new grates can be simulated in terms of new open area…

Improved Relationships for Discharge in SAG/AG Mills

The literature exposed a clear lack of previous research on the influence and performance 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 …

(DOC) Main text | Gurubasayya Swamy - Academia.edu

Effect of feed size on SAG mill performance Feed characteristics of ROM ore have large impact on SAG mill performance. Results obtained from the study of effect of feed size on mill throughput are presented in table 6. From the results obtained it is found that the mill performance seems to be the best when feed contains at least 30 to 40% of +3in.

Improving Autogenous/Semi-Autogenous Grinding …

discharge pump (grate and pulp lifters) operates. The essential function of a pulp lifter is to transport the broken material and slurry from the discharge grate out of the mill. Hence, the design optimisation of pulp lifters affects not only the energy efficiency and throughput of autogenous grinding/semi-autogenous (AG/SAG) grinding

(PDF) Exploring the Effect of Blast Design on SAG Mill ...

Exploring the Effect of Blast Design on SAG Mill Throughput at KCGM ... to simula te the performance of the gyr atory and sag. ... undertaken in which the mill speed, grate open area and the ...

grates opening in sag mill - rajpms.co.in

Effect Of Grate Discharge Area Of Sag Mill. sag mill grates Grinding Mill China. the effects of changes to SAG mill grate and screen apertures are shown in Table 2 The CEET program maintains the average tph at the specified level of 906 and the average P80 at 210 microns at all apertur The major effect of increasing 187; Learn More.

Overflow Versus Grate Discharge Ball Mills: An ...

Overflow Versus Grate Discharge Ball Mills: An Experimental Investigation. ... 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 discharge flow mechanism. The experimental results are analyzed to study the influence of operating variables on ...

ARE SAG MILLS LOSING MARKET CONFIDENCE?

Different combinations of SAG mill ball charge and grate open area were tested until 2006. A higher load level was achieved after several changes in the grate design that prevented both liner and grate breakage. Upon resolution of issues related to the mill grate design, the project achieved the target throughput of 41 kt/d. Phoenix

Turbo Pulp Lifter (TPLTM) - An Efficient Discharger to ...

Turbo Pulp Lifter (TPLTM) - An Efficient Discharger to Improve SAG Mill Performance Sanjeeva Latchireddi Chief Process Engineer Outokumpu Technology Inc. Centennial Co 80112, USA Phone +1 303 792 3110 x224 Fax +1 303 799 6892 Email: [email protected] Key Words: SAG, Grate, Pulp lifter, pebbles, flow-back, carry-over

Optimizing your SAG Mill | Mining Surplus

Mar 02, 2010· The commercially viable and industry accepted alternate is a grate discharge trunnion supported mill or a grate discharge shell supported mill using pulp lifters. The only way to eliminate the problem of flow-back and carry-over of slurry and pebbles is by optimizing the design of the discharge …

Choosing a SAG Mill to Achieve Design Performance

Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, Grinding 1 Starkey & Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd. E. Oakville, Ontario L6J 7S4

SAG Mill Grinding Circuit Design

PDF | On Sep 7, 2015, Paul Toor and others published Understanding the effects of liner wear on SAG mill performance