# sag mill feed size distribution

### Modelling SAG milling power and specific energy

distribution affects the SAG mill load and the load affects directly the mill power and the efﬁciency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not consider the projected feed size distribution it is likely that this mill

Get price### Fragmentation Modelling and the Effects of ROM

tomill optimization work focuses on feed size to the SAG Mills (Dance et al. 2006). SAG mills require a certain ore feed size distribution to operate efficiently. This feed is supplied to the mill by the Primary Crusher, which is also influenced by the size distribution achieved from blasting.

Get price### Model Predictive Control for SAG Milling in Minerals

Model Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.

Get price### THE COMMINUTION CIRCUIT DESIGN FOR THE CONSTANCIA

The ROM ore size distribution is a function of the geotechnical properties (fracture frequency and Rock Quality Designation (RQD)). Hence, the feed size to the SAG mill is a function of rock competency (Axb) and rock fracture. Burger, McCaffery, McGaffin, Jankovic, Valery, &

Get price### Robust control of a SAG mill ScienceDirect

Fig. 3 compares the regulatory response of two robust SAG mill controllers to a number of step changes in the disturbance variable F 80.At t=5 h, F 80 was stepped up from 61.5 to 63.3 mm (i.e. the feed particle size distribution was increased), while at t=36 h, F 80 was stepped down from 63.3 to 57.7 mm (i.e. the feed particle size distribution was decreased).

Get price### SAG Mill Control at Northparkes Final

Changes in both the size distribution (f80) and hardness (work index) of the feed are the most important disturbances affecting SAG mill behaviour. Size distribution can be measured using image analysis techniques and used as a feedforward signal for improving load control.

Get price### SINGLE STAGE SAG/AG MILLING DESIGN

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semiautogenous / autogenous (S/AG) milling has become a common design for a variety of ore number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the The feed size must be realistic as an inappropriate particle size distribution

Get price### Modelling SAG milling power and specific energy

Two new SAG milling models are developed in this work, able to predict power or specific energy consumption, including the usual design variables such as mill size balls charge level, solids concentration in the SAG mill feed and % of critical speed, but adding a variable that represents the feed size distribution.

Get price### OUTOTEC GRINDING TECHNOLOGIES

used where a narrow product size distribution is required (for example, for subsequent gravity separation). MH Series Grinding Mills A standard range of SAG, ball, and rod mills with spherical roller bearing technology, enabling faster delivery and startup lead time. OUR MILL RANGE Pebble mills Outotec has a long history of successfully

Get price### Yanacocha Gold Single Stage SAG Mill Design, Operation

EGL, 16.5MW single stage SAG mill, to process 5 million tonnes per annum high grade oxide Au/Ag ore. Operational control, feed size distribution, grinding media, mill liner, grate and pulp lifter optimisation have allowed the mill to operate 1530% above design throughput rates, but

Get price### The measurement of comminution processes in tumbling mills

The measurement of comminution processes in tumbling mills. The particle dynamics inside the mill has been shown to be influenced significantly by the feed particle size distribution, feed rate as well as the water addition rate, mill physical operating conditions and the composition of charge inside the mill. Photograph of the SAG mill

Get price### Achieving and sustaining productivity benefits through a

For example, SAG mills benefit from having the finest possible top size, minimisation of intermediate (critical) sized material and increased fines (10 mm). On the other hand, fully AG mills require larger rocks in the feed to act as grinding media and often do well with a bimodal feed size distribution

Get price### Predicting SAG/AG Mill and HPGR Specific Energy

changes to feed size distribution through modifiion to blasting practices and primary crusher operation – socalled MinetoMill approach. 3.2 MinetoMill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying

Get price### SAG Mill goldcilplant.com

The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14''——means it is a dry mill.

Get price### (PDF) Influence of feed size on AG / SAG mill performance

The feed size distribution together with the ore characteristics (hardness, lithology, alterations, etc.) are the most important factors affecting the SAG mills performance.

Get price### I203 I204 INTRODUCTION

sieving the material is the most accurate method of determining the size distribution of the ag/sag mill feed. However, fluctuations in feed size

Get price### 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

Get price### THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND

THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND SAG MILL CIRCUIT primary crusher product size distribution is reasonable size is the product of the SAG mill circuit and the feed

Get price### SAG Mill Control at Northparkes Final

Changes in both the size distribution (f80) and hardness (work index) of the feed are the most important disturbances affecting SAG mill behaviour. Size distribution can be measured using image analysis techniques and used as a feedforward signal for improving load control.

Get price### Predicting SAG/AG Mill and HPGR Specific Energy

changes to feed size distribution through modifiion to blasting practices and primary crusher operation – socalled MinetoMill approach. 3.2 MinetoMill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying

Get price### A Neural Network Model for SAG Mill Control

SAG specific power range of about 3 to 9 kWh/t for this site. The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant shortterm segregation occurring under certain operating situations. Depending on ore type and feed size distribution, each SAG mill will process between 700 and 3000 tph.

Get price### Achieving and sustaining productivity benefits through a

For example, SAG mills benefit from having the finest possible top size, minimisation of intermediate (critical) sized material and increased fines (10 mm). On the other hand, fully AG mills require larger rocks in the feed to act as grinding media and often do well with a bimodal feed size distribution

Get price### SAG Mill Feed Particle Size Analyser

We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardwaresoftware''s behaviour. Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.

Get price### AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator

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. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill

Get price### Size Distribution SAG Mill Balls Crusher Mills, Cone

SAG mill design,SAG mill for sale for the ball milling process. High energy SAG mills are used to grind powder material down to a particle size below have been made and the distribution of the balls impact velocities

Get price### Advanced Simulation for SemiAutogenous Mill Systems: A

Advanced Simulation for SemiAutogenous Mill S ystems: A Simplified Models Approach 147 description it is necessary to consider the relationship between the feed stream and mill charge level. This relationship is known as the transport rate and is probably the least developed aspect in models proposed so far (Apelt et al., 2002 a,b).

Get price### SAG Mill Feed Particle Size Analyser

We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardwaresoftware''s behaviour. Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.

Get price### A Method of C alculating Autogenous/ SemiAutogenous

stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on loglog paper. This is because the particle size distribution (PSD), these mills

Get price### SAG Mill Feed Particle Size Analyser

We describe here one of the very first pioneering SAG Mill Feed Particle Size Analysers: A set of preliminary experiments was carried out in order to assess the hardwaresoftware''s behaviour. Static ore was used to obtain the right sequence of image processing algorithms. The camera was installed 3 mts away from the commercial sizer over the feed conveyor of the SAG Mill.

Get price### Chapter M MODELLING, SIMULATION, OPTIMIZATION

operation fluctuations. To sample SAG mill fresh feed, belt conveyor was stopped and a sample was taken by removing material over a twometer length. Operating condition during sampling was recorded. Particle Size distribution of all samples except mill fresh feed and ss reject was determined using 6730 to 38 µm screens.

Get price### Feed Size VS Ball Size Grinding & Classifiion

xG is the mill feed d80, not the circuit feed. For SAG mill, the xG value has to be determined by scalping of the full size distribution. The particles larger than the minimum pebble size (given by the pebble extraction grate opening) has to be excluded from the distribution to calculate the top ball size!

Get price### EFFECT OF BALL SIZE DISTRIBUTION ON MILLING

2.6.1 Ball size distribution in tumbling mills 37 2.6.2 Milling performance of a ball size distribution 40 2.7 Summary 41 Chapter 3 Experimental equipment and programme 43 3.1 Laboratory grinding mill configuration 43 3.2 Preparation of monosize grinding media 44 3.3 Feed material preparation 46

Get price### SAG Mill Control at Northparkes Final

Changes in both the size distribution (f80) and hardness (work index) of the feed are the most important disturbances affecting SAG mill behaviour. Size distribution can be measured using image analysis techniques and used as a feedforward signal for improving load control.

Get price### SAG Mill goldcilplant.com

The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14''——means it is a dry mill.

Get price### Ø Effect of SAG Mill Feed Size Distribution and Ore

SAG Mill I12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifiions, and Ø Circuit Design Considerations That Influenced Throughput

Get price### Chapter M MODELLING, SIMULATION, OPTIMIZATION

operation fluctuations. To sample SAG mill fresh feed, belt conveyor was stopped and a sample was taken by removing material over a twometer length. Operating condition during sampling was recorded. Particle Size distribution of all samples except mill fresh feed and ss reject was determined using 6730 to 38 µm screens.

Get price### THE COMMINUTION CIRCUIT DESIGN FOR THE CONSTANCIA

The ROM ore size distribution is a function of the geotechnical properties (fracture frequency and Rock Quality Designation (RQD)). Hence, the feed size to the SAG mill is a function of rock competency (Axb) and rock fracture. Burger, McCaffery, McGaffin, Jankovic, Valery, &

Get price