sag mill grate design

SAG Mill Liner Design - Mineral Processing Metallurgy

Metallurgical ContentMill Internals Grinding Mill Shell DesignSemi-Autogenous Mill Liners Designs Alloys and Maintenance ProceduresGood Mill Liner Alloys And Design Installation and Prudent Operational PracticesGeneral Liner Design PrinciplesIdeal Liner DesignSemi-Autogenous Grinding (SAG) Mills

Optimization of the Design of SAG Mill Internals Using ...

of SAG mill performance through 1. Changes in liner/lifter design to maximize throughput while maintaining acceptable wear levels. 2. Changes in ball size to maximize particle breakage without producing exceptionally high impact forces. 3. Changes in grate and pan lifter designs to decrease internal mill recycle and increase throughput.

THE INFLUENCE OF SHELL, GRATE AND PULP LIFTERS ON SAG

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.

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.

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

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 transport the ...

Optimizing your SAG mill operation - International Mining

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.

Developments in AG/SAG Mill Modelling

m = radius of mill inside the liners The parameter values b,c,d and k were found to be functions of pulp lifter design and size and were fitted to experimental data using the equation form: x = x g – k xe (-PLS) where, x g = parameter value for grate-only condition k x = constant for a given pulp lifter design (eg spiral or radial)

Inlets in Sags – Learn Stormwater Studio

Grate Inlets in Sag. ... If the perimeter, P, has been set to 0 by you, the program sets it by assuming d = “Grate Design Depth” and solving for P in the weir equation. There is not a design option for the curb opening length on combination inlets. The program sets it equal to the grate length if found to be 0.

sag mill grate design - minibulles.ch

sag mill grate design. S Mill Grinding Circuit Design - 911metallurgist Semi Autogenous Design FactorsSag Mill Operation ExampleProcess Plant DescriptionSag Mill Design and SpecificationOperating Problems Since CommissioningDesign Changes and Future Operating Strategies The Kidston plant was designed to process 7500 tpd fresh ore of average ...

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.

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

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

Developments in AG/SAG Mill Modelling

m = radius of mill inside the liners The parameter values b,c,d and k were found to be functions of pulp lifter design and size and were fitted to experimental data using the equation form: x = x g – k xe (-PLS) where, x g = parameter value for grate-only condition k x = constant for a given pulp lifter design

Mineral movement simulation through the grates and pulp ...

angle increases the mill’s outlet flow. Keywords: grate, SAG-Mill, DEM-Simulation, flow-back, carry-over 1. Introduction Size reduction of ores has an important role in the process of obtaining various metals.

Starkey Associates Inc. - Leaders in Comminution Design

John Starkey, P. Eng. has worked in SAG mill hardness testing since 1964 where he worked as pilot plant engineer for A. MacPherson’s projects. He invented the SPI and SAGDesign tests. The latter is now acknowledged by our clients to be a world-class method for grinding circuit design

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

Inlets in Sags – Learn Stormwater Studio

Grate Inlets in Sag. ... If the perimeter, P, has been set to 0 by you, the program sets it by assuming d = “Grate Design Depth” and solving for P in the weir equation. There is not a design option for the curb opening length on combination inlets. The program sets it equal to the grate

(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 .

(PDF) Exploring the effect of blast design on SAG mill ...

Table 4 – SAG Mill Simulation Results Design Throughput (t/hr) P80(mm) P50(mm) Power(kW) kWh/t 1 1250 3.21 0.69 12750 10.2 2 1420 3.13 0.65 12755 9.0 3 1480 3.11 0.63 12749 8.6 As can be seen a significant increase in throughput is obtained with Design 2 with further, though proportionately much less, improvement with Design 3.

OUTOTEC GRINDING TECHNOLOGIES

• Mill design tailored according to unique application needs. 2 . 3 ... single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. ... SAG and AG mills typically have grate

CiteSeerX — THE INFLUENCE OF SHELL, GRATE AND PULP LIFTERS ON SAG MILL PERFORMANCE

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.

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 ...

(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 10.8% open area with 3 and 3.5 inch apertures.

SINGLE STAGE SAG/AG MILLING DESIGN - Orway Mineral

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

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

OUTOTEC GRINDING TECHNOLOGIES

• Mill design tailored according to unique application needs. 2 . 3 ... single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. ... SAG and AG mills typically have grate discharge arrangements which can be either with or

Starkey Associates Inc. - Leaders in Comminution Design

John Starkey, P. Eng. has worked in SAG mill hardness testing since 1964 where he worked as pilot plant engineer for A. MacPherson’s projects. He invented the SPI and SAGDesign tests. The latter is now acknowledged by our clients to be a world-class method for grinding circuit design, and is accepted by our peers as a standard for ore ...

INFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS

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).

Inlets in Sags – Learn Stormwater Studio

Grate Inlets in Sag. ... If the perimeter, P, has been set to 0 by you, the program sets it by assuming d = “Grate Design Depth” and solving for P in the weir equation. There is not a design option for the curb opening length on combination inlets. The program sets it equal to the grate length if found to be 0.

(PDF) Exploring the effect of blast design on SAG mill throughput at KCGM

Table 4 – SAG Mill Simulation Results Design Throughput (t/hr) P80(mm) P50(mm) Power(kW) kWh/t 1 1250 3.21 0.69 12750 10.2 2 1420 3.13 0.65 12755 9.0 3 1480 3.11 0.63 12749 8.6 As can be seen a significant increase in throughput is obtained with Design 2 with further, though proportionately much less, improvement with Design 3.

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

What's the Difference Between SAG Mill and Ball Mill - JXSC Machine

SAG mills grinding media includes some large and hard rocks, filled rate of 9% – 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills. How does a sag mill work?

Slurry flow in mills with TCPL — An efficient pulp lifter for ag/sag mills

Jun 01, 2006  The GDM include autogenous (ag), semiautogenous (sag) and grate discharge ball mills. The purpose of the pulp lifters is simply to transport the slurry passing through the grate holes into the discharge trunnion. The performance analyses of conventional design of pulp lifter have shown that a large amount of slurry flows back from pulp lifter ...

38' X 22' EGL METSO GRATE DISCHARGE SAG MILL - Nelson Machinery Equipment Ltd.

Mill was ordered but the project was cancelled prior to installation. It is stored at manufacturer warehouses or storage sites. Manufacture and Design Grate discharge Diameter 38′ Length 25’5″ flange-to-flange EGL 22′ Components / Inclusions Feed chutes Discharge grates Steel pulp lifters SAG mill trommel Mill braking system Hydraulic ...