grate discharge sag mill

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 jacking system Portable hydraulic power unit. Motor and Drive 26,000 HP (19.4 MW) Siemens wrap-around drive motor

As secondary ball mills are usually fed a relatively (compared to SAG mills) fine F80 and have high re-circulating loads and produce product fineness of the P80 - 100 to 160 micron range, fitting a grate discharge needs to be carefully considered. ... In simple words, grate discharge mills give higher tonnage, but produce coarser grinding, that ...

Designed for discharge efficiency. The role of the grate is to allow the discharge of the material ground in the mill via the slots. With our range of alloys and design experience we can offer the longest possible lifetime with the optimal grinding efficiency. The design of the grates will depend on: Drilling pattern; Mill speed (rpm)

large SAG mills Rubber or composite discharge systems reduce weight in metallic-lined mills Metallic grate plates combined with Poly-Met™ offer a balanced wear solution for large mills Application examples Custom designed Adaptable Perfect fit. 9 Head linings A balanced feed head lining

SAG mill A SAG mill is almost always a high-impact application. Hence, it is wise to use tough, impact-resistant materials that are somewhat softer but less brittle to avoid cracking, chipping, or breaking. Rubber/steel composite liners are often a good choice as is the range of more impact-resistant cast alloys. Rod mill As there should be very

Curved pulp lifters can improve pebble discharge and the wear lives of pulp lifters. The more fluid components of the material in the pulp lifter can also flow into the mill through grate openings as the grates rotate out of the charge. Control of this "reverse flow" is a critical aspect of grate and pulp lifter design. Pulp lifter charge ...

A particle scale model based on a full two-way coupling of the Discrete Element Method (DEM) and Smoothed Particle Hydrodynamics (SPHs) methods is applied to SAG mills. Motion and collisions of ...

The Discharge End (DE) pulp lifter is a critical component of autogenous (AG) and semi-autogenous (SAG) grinding mills, having a significant impact on the throughput, efficiency and performance of mills. Underestimating the importance of an optimised liner design in a mill can lead to back-flow and carry-over processes which can ultimately ...

Improving Energy Efficiency in SAG Mills. Pilot-Scale SAG Mill Facility Will Help to Optimize Charge Motion and Slurry Flow in Plant-Scale SAG Mills - Reducing Energy Consumption. The U.S. mining industry operates approximately 80 semi-autogenous grinding mills (SAG) throughout the United States. Both mine and mill site variables …

Grate discharge. Most participants in the course will be familiar with tumbling mills, so only the briefest of conceptual reviews will be offered here. Though this section is specific to …

to the discharge grate will be obtained. The discharge function can then be more realistic and scaleable, as it will not have to accommodate the ... the SAG mill and the key testwork data is given ...

AG & SAG Mill Grinding Compared – Which is Best. Grinding rods and balls can be obtained in uniform sizes, weights and of a specified quality. Their action in a mill can be reasonably predicted. ... In South Africa wet grate discharge mills having a nominal ratio of length to diameter slightly larger than 1 (16/12 = 1. 33 and 14/12 = 1.17.

AG and SAG mills of 12–23 MW power draw are at the forefront of size reduction for mineral extraction in most of the mining operations around the world. The pulp discharge mechanism, consisting of a grate and pulp lifter arrangement, is an integral component of these mills. The grate retains over-size particles in the mill charge.

The slurry transportation in AG/SAG mills is a two-stage process consisting of flow through the grate and the discharge of slurry by pulp lifters into the discharge trunnion. The grate-only discharge condition provides the ideal relation between slurry hold-up and flowrate. By attaching pulp lifters to the grate, the ideal hold-up–flowrate ...

Water Grinding media 0-I Discharge cone ~ Transparent grate Roller Fig. 1. Schematic of laboratory mill. S. Morrell, 1. Stephenson / Int. J. Miner. Process. 46 (1996) 53-72 55 row C row B row A Fig. 2. Schematic of laboratory mill discharge grate. The flow of water to the mill was regulated using an adjustable valve and measured using a …

Produced for more than 50 years, effective materials for crushing and. grinding in industry. Consists of martensite matrix, with nickel alloyed at 3-5% in order to. suppress transformation of austenite to pearlite. Chromium usually included between 1.4-4% to ensure carbon phase.

The Bradken Vortex® Discharge System: Provides superior discharge performance for SAG and AG mills. Is ideally suited to high throughput, high solids discharge mills. Increases ore throughputs. Increases pulp lifter wear life. Our one-piece Super Vortex® Grates cover the full depth of the charge to maximize grate open area and mill …

Here I try to explain how ground slurry is discharged from a grate ball mill (or SAG). How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill …

Flow in the 36 ft SAG mill viewed in the axial direction looking towards the discharge grate (with the feed half of the mill removed to provide visibility of internal flow structure): (a) complete charge, with solids shown in brown and the slurry shown in light blue at 3 s, (b) coarse resolved particles (DEM) coloured by their speed, with red ...

mill size, speed, charge, charge level, type, size of grinding media, expected service life, and – of course – ore size and properties, such as hardness and abrasiveness. SAG mill …

The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter. This process develops complex flow behaviour in the region of the ...

Provides superior discharge performance for SAG and AG mills. Is ideally suited to high throughput, high solids discharge mills. Increases ore throughputs. Increases pulp lifter …

A detailed investigation by Latchireddi (2002), Latchireddi and Morrell (1997, 2003a and 2003b) on impact of the discharge grate and pulp lifters on slurry transport in SAG mills revealed the ...

1. Feed trunnion: assembly through which solids and water enters into the mill. 2. Mill Shell: main chamber where ore particles are broken due to tumbling action of the mill. 3. Grate: screen, which allows the ground ore particles and water to pass through in the form of slurry. 4. Pulp lifter: lifts the slurry, which passes through grate into ...

Outer discharge grate panels can be installed to facilitate two or four x 75 mm ports pebble ports. Integrated with a classification tower and feed/discharge conveyor system, the mill can be set-up to facilitate …

The results suggest that regular calibration of oversize crusher and primary cyclone feed instrumentation, regular measurement of the SAG mill discharge screen …

To explore three dimensional slurry flow in a SAG mill, including discharge through the grates and flow in the pulp chamber, we use a pilot scale Hardinge 6 ft (D) × 2 ft (L) (1.8 m × 0.6 m) mill. The model contains the complete mill geometry including the feed end, the main/belly/circumferential lifters, the end wall lifters, the grate, the ...

Semantic Scholar extracted view of "Slurry flow in mills: grate-only discharge mechanism (Part-1)" by S. Latchireddi et al. Skip to search form Skip to main content Skip ... (DEM) study of load movement within a SAG mill 12,192 × 7620 (40′ × 25′) in normal operating conditions is performed. The purpose is to determine how the geometry ...

One way of fully utilizing a ball mill is to convert it from an overflow to a grate discharge. Consider mill power draw, product, throughput and conversion costs.

The product from the SAG mill is further reduced in size using pebble crushers and ball mills. Hence, typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size. Considering a typical mining operation processes 10,000 to 100,000 tons per day the energy expenditure in grinding is 50 …

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 and pulp lifters on pulp discharge. In recent years, the trend in large SAG mills has been to use wide-spaced shell lifters with large lifter face angles, primarily to

Highlights One-way coupled SPH–DEM models can predict the flow of solids and fluid charge in SAG mills. End walls and worn shell liners create significant axial flow and recirculation in a SAG mill charge. Slurry flow through the grate and along the pulp lifters and discharge from the mill can be predicted. End wall lifters are critical to grate …

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 …

The coupled DEM + SPH has been used for the prediction of the slurry flow within a SAG mill grinding chamber, flow through the grate and discharge flow along the pulp lifters Morrison, 2011a, 2012

This paper presents the results obtained to date from experiments carried out in a laboratory SAG mill with grate-only as well as grate and pulp lifter arrangements. Scale models of industrial pulp lifter designs were used The results illustrate the influence of pulp lifter chamber volume and show that over a wide range of values, the discharge ...

SAG 1 SAG 2 Unutilised space Figure 4 Los Bronces SAG mill 2 discharge grate As illustrated in Figure 4, the mill has classic massive pebble porting, typical of the operations aiming for maximum pebble discharge rate. The open area is successful at achieving this, but at an associated cost that is generally not appreciated. ...