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 …

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.

SAG Mill Grinding Circuit Design - 911metallurgist.com

SAG Mill Liner Design - Mineral Processing & Metallurgy

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. For example, for copper the ore must be separated from the mineral and must reach sizes smaller than 50 m, and this

SAG Mill Operation at Cortez: Evolution of Liner Design ...

The Cortez SAG mill liner design was recently modified to improve the mill operating energy efficiency. In addition to the expected benefits, the design change unexpectedly played a ... built with a 17° face angle. The grate open area was nominal 7% generated from 2.75” x 2.75” square holes. 5” grinding balls are also used.

SAG MILLS OPTIMIZATION: IMPLEMENTATION AND …

SAG Mills Linings Design h: altura media de lifterlibre d= distancia media entre lifters Área entre lifters 1.941 cm2 d/h = 2,56 (706/276) Vlift /Vmol ~ (Área entre lifters x filas de lifters )/Área transversal del molino d = media distance between lifters

SINGLE STAGE SAG/AG MILLING DESIGN - orway.com.au

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

SINGLE STAGE SAG/AG MILLING DESIGN - orway.com.au

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

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) Yanacocha Gold Single Stage SAG Mill Design ...

media, mi ll line r, grate and pulp lifte r optimis ation have allow ed the mill to operate 15-30% abo ve design throughput rates, but with a p roduct P80 co arser than design. A s part of the ...

SAG MILLS OPTIMIZATION: IMPLEMENTATION AND …

SAG Mills Linings Design h: altura media de lifterlibre d= distancia media entre lifters Área entre lifters 1.941 cm2 d/h = 2,56 (706/276) Vlift /Vmol ~ (Área entre lifters x filas de lifters )/Área transversal del molino d = media distance between lifters

Operation of SAG Mills,Principle Operation of Semi ...

Its performance depends on the mill size and design, the grate design, and mill operating conditions, such as mill speed and charge level. The difficulties associated with slurry transportation from SAG mills have become more apparent in recent years with the increasing trend to build larger-diameter mills for grinding high tonnages.

(PDF) SINGLE STAGE SAG/AG MILLING DESIGN SINGLE STAGE SAG …

The SAG mill model in the JKSimMet software has not been shown to accurately reproduce the performance of a single stage mill for greenfield design. A review of most modern power models shows that the prediction of specific energy is influenced by the high energy breakage characteristics of the ore (DWi, t 10 , SPI etc.) and the low energy (BWi).

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.

Sag mill design pdf - WordPress.com

sag mill design pdf Liner design needs to respond to the process aspects of mill.The test and study work showed that a single line 42 ft SAG mill circuit gave the. sag mill grate design SAG mill design, GMD design and the associated component manufacturing.Key Words: SAG mill, design, optimum conditions, grinding, pilot testing.

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

Publications - SMC Testing

A New Design Of Pulp Lifter For Grate Discharge Mills Slurry Flow In Mills Grate-Pulp Lifter Discharge Systems (Part 2) A Novel Approach To The Geometallurgical Modelling Of The Collahuasi Grinding Circuit The Appropriateness Of The Transfer Size In AG And SAG Mill Circuit Design Ag SAG Mill Circuit Grinding Energy Requirement - How To Predict ...

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) Slurry flow in mills: Grate-pulp lifter discharge ...

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.

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

Aug 01, 2007· SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e., the impact of shell liners on the grinding action and of grates ...

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.

Operation of SAG Mills,Principle Operation of Semi ...

Its performance depends on the mill size and design, the grate design, and mill operating conditions, such as mill speed and charge level. The difficulties associated with slurry transportation from SAG mills have become more apparent in recent years with the increasing trend to build larger-diameter mills for grinding high tonnages.

SAG MILLS OPTIMIZATION: IMPLEMENTATION AND …

SAG Mills Linings Design h: altura media de lifterlibre d= distancia media entre lifters Área entre lifters 1.941 cm2 d/h = 2,56 (706/276) Vlift /Vmol ~ (Área entre lifters x filas de lifters )/Área transversal del molino d = media distance between lifters

Optimizing performance of AG/SAG mills – A design approach

Jan 01, 2005· 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.

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

Advanced Simulation for Semi-Autogenous Mill Systems: A ...

SAG mills (see Figure 1) are presently one of the most widely used ... influence of the design and the geometry of the mill pulp lifters. The results of the ... efficiency vector, ci (fraction), which includes two effects: one produced by the mill s internal grate and the other by the pulp evacuation system (Magne et al., 1995). Thus, c i is

Sag mill design pdf - WordPress.com

sag mill design pdf Liner design needs to respond to the process aspects of mill.The test and study work showed that a single line 42 ft SAG mill circuit gave the. sag mill grate design SAG mill design, GMD design and the associated component manufacturing.Key Words: SAG mill, design, optimum conditions, grinding, pilot testing.

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

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

A General Model for Semi-autogenous and Autogenous …

for SAG and FAG mills, and gives the results of recent investigations of the ... performance of a typical SAG mill design (LID = 0.5) with that of a representative FAG mill with LID = 2. It is assumed that ... material of sizes less than grate opening in a mill of effective volume V, [5] where C s is the volume fraction of solid in

Publications - SMC Testing

A New Design Of Pulp Lifter For Grate Discharge Mills Slurry Flow In Mills Grate-Pulp Lifter Discharge Systems (Part 2) A Novel Approach To The Geometallurgical Modelling Of The Collahuasi Grinding Circuit The Appropriateness Of The Transfer Size In AG And SAG Mill Circuit Design Ag SAG Mill Circuit Grinding Energy Requirement - How To Predict ...

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.

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.

Grate liners | Magotteaux

AG mill. SAG mills. All grate discharge mills (ROM, primary mills, etc.) Grates are manufactured in CrMo (FMU226 type) for AG and grate discharge mills and in High-Chrome for AG mills. Lifters design adapted to avoid overthrowing of balls. Design to best fit to the existing pulp lifters. Available languages. All English Mandarin.

SAG Mill Liner - mgscasting.com

Based on experience, mill liner designs have moved toward more open shell lifter volumetric capacity and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. Mill throughput is maximized with shell lifters between ratios of …