Sag Mill Feed Size Distribution

Ø Effect of SAG Mill Feed Size Distribution and Ore

I-13 Figure 1: Concentrator Throughput and Availability Project to Date SAG mill availability has reached the design level, however throughput

I-203 I-204 INTRODUCTION - ResearchGate

distribution of the ag/sag mill feed However, fluctuations in feed size However, fluctuations in feed size make such sizings valuable only if they can be done very frequently,

Modelling SAG milling power and specific energy

Modelling SAG milling power and specific energy consumption including the feed percentage of intermediate size particles M Silva, A Casali⇑ Mining Engineering Department, Universidad de Chile, Beauchef 850, Santiago 8370448, Chile

Model Predictive Control for SAG Milling in Minerals

SAG and ball mills are generally accepted as the largest power consumers in a mining and mineral processing operation and can be 80% of total electrical energy consumed at a specific power consumption of around 20kWh/ton

A Method of C alculating Autogenous/ Semi-Autogenous

Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 05 slope when plotted on log-log stone This is because the particle size distribution (PSD), these mills

Application of Operating Work Indices in Autogenous

limited value in evaluating AG-SAG and ball mill sections separately This problem arises due to the difficulty of This problem arises due to the difficulty of describing particle size distributions with different shapes by one number, the eighty percent passing size

Predicting SAG/AG Mill and HPGR Specific Energy

Predicting SAG/AG Mill and HPGR Specific Energy Requirements Using the SMC Rock Characterisation Test SMorrell SMCC Pty Ltd E-mail: [email protected]

SAG Mill Optimization using Model Predictive Control

Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, MS, van der Westhuizen, AP, & Mainza, AN 2009)

The SAG grindability index test - ScienceDirect

SAG mills operating in closed circuit with both finer feed and in-circuit pebblecrushing would, therefore, show f SAG values approximately equal to product of the fine feed and pebble crushing correction factors, ie approximately 077

Mill (grinding) - Wikipedia

SAG is an acronym for Semi-Autogenous Grinding SAG mills are autogenous mills but use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor

A Method of C alculating Autogenous/ Semi-Autogenous

Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 05 slope when plotted on log-log stone This is because the particle size distribution (PSD), these mills

SAG Mill Optimization using Model Predictive Control

Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, MS, van der Westhuizen, AP, & Mainza, AN 2009)

The influence of feed size on autogenous and semi

This stone describes the influence of feed size distribution on ag/sag mill performance with reference to a range of plant data It particularly concentrates on how changing blasting practice to modify ag/sag feed size can have a considerable overall benefit

Optimization and Control of a Primary SAG Mill Using Real

1 Optimization and Control of a Primary SAG Mill Using Real-time Grind Measurement CW Steyn*, K Keet**, W Breytenbach*** *Control Engineer, Anglo American Platinum, Control and Instrumentation Department, Johannesburg,

The influence of mill speed and pulp density on the

The particles size distribution slope is not affected by the mill speed (see Graph 2) as the curves are mostly overlapping Density These tests were done with a ∅082 x 1 m grate discharge mill with a 30 mm graded ball charge and a 30% filling degree The mill discharge pulp …

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

Gold Fields Granny Smith Grinding Circuit: A Metallurgist

After closed-circuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD)

Comminution Services - SGS

autogenous grinding as well as to SAG mill primary grinding In the SAG mill testwork when the steel is added the SAG product classification size and ore feed size distribution is varied If necessary, pebble crushing or mill speed can also be investigated All tests are evaluated on the basis of feed rate, power consumption and product size analysis

ACT Grinding Optimization System - Outotec

The Outotec ACT grinding optimization system utilizes feed particle size data from RockSense, charge analysis from MillSense, and slurry particle size measurements from PSI, as well as other available on-line measurements

SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY – …

commercial SAG mill grinding conditions on 45 L of ore and determines the SAG mill pinion energy needed to grind ore from 80% passing 152 mm to 80% passing 17 …

The influence of feed size on autogenous and semi

This stone describes the influence of feed size distribution on ag/sag mill performance with reference to a range of plant data It particularly concentrates on how changing blasting practice to modify ag/sag feed size can have a considerable overall benefit

Autogenous and Semi-Autogenous Mills

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill

SAG MILL GRINDING DESIGN VERSUS GEOMETALLURGY – …

commercial SAG mill grinding conditions on 45 L of ore and determines the SAG mill pinion energy needed to grind ore from 80% passing 152 mm to 80% passing 17 …

Metallurgy & Mineral Processing - SRK

of feed size on mill throughput No 48 SRK Consulting’s International Newsletter One of the most valuable aspects of blasting is the generation of very fine particles (eg, smaller than 12mm) that will pass through the primary mills and onto the secondary ball mill circuits, alleviating a common bottleneck Modifying blasting practices to achieve a more suitable mill feed size – which

Inferential Measurements for SAG Mills - OoCities

Semi-autogenous grinding (SAG) mill performance is influenced by ball charge, rock charge and feed properties which are di_cult to measure directly The development of inferential measurement models of SAG mill total charge and ball charge levels, feed rate and size distribution, and, mill discharge

OUTOTEC AUTOMATION SOLUTIONS FOR GRINDING OPTIMIZATION

size distribution in order to reach high grinding effi ciency and throughput, especially in grinding circuits involving autogenous (AG) or semi-autogenous (SAG) mills

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE

If a ball mill circuit were to be fed 2 distributions, each with same P80 but with the open and closed circuit gradients in Figure 1, the closed circuit distribution would require more energy to grind to …

ACT Grinding Optimization System - Outotec

The Outotec ACT grinding optimization system utilizes feed particle size data from RockSense, charge analysis from MillSense, and slurry particle size measurements from PSI, as well as other available on-line measurements

Optimizing Performance of SABC Comminution Circuit of the

Minerals 2016, 6, 127 3 of 9 back to the SAG mill This causes a higher variation in the feed rate and particle size distribution in the feed to the SAG mill, which results in a greater variation in the SAG mill power draw in the transition

Grinding in Ball Mills: Modeling and Process Control

rotation, the mill loading, the final product size required from a given feed size (coefficient of reduction), the work index of the material, the mill shaft power and the specific gravity of the material