### Outotec Grinding technologies

together with feed and product size distribution is necessary to optimize mill sizing and design for specific applications. Using Outotec's combined expertise in grinding, in-house sizing programs and grinding database, Outotec is able to accurately determine the correct mill type and size for any given application. A thorough understanding of ...

### Application of Operating Work Indices in Autogenous ...

AG/SAG mill product that needs additional grinding in the ball mill, or "Corrected Ball Mill Feed." T2' is the 80% passing dimension of the Corrected Ball Mill Feed. Figure 1. Comparison of the Particle Size Distribution Slopes Figure 2. Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3.

### 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.

### Applying grindcurves to mill operation and optimisation

operating their mill. Factors such as mill speed, mill inlet water, feed size distribution, and ore hardness all have an inﬂuence on the grindcurve, and form an integral part of the optimisation process. Test work has been conducted at a number of sites to develop grindcurves for different mills treating a .

### FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W, 2001). 2.2. EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves.

### Ø Effect of SAG Mill Feed Size Distribution and Ore ...

SAG Mill I-12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications, and Ø Circuit Design Considerations That Influenced Throughput

### I-203 I-204 INTRODUCTION - ResearchGate

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

### (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.

### Characterization and Modeling of Semi-Autogenous Mill ...

2.2 Ore size distribution measurement Ore size distribution is considered an important process measurement for SAG mills' operation and control. Both, ore hardness and ore size distribution are the most im-portant disturbances that a ect SAG operation and, thus, having information of .

### 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 .

### 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 con-sider the projected feed size distribution it is likely that this mill

### A Neural Network Model for SAG Mill Control - sgs

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 short-term segregation occurring under certain operating situations. Depending on ore type and feed size distribution, each SAG mill will process between 700 and 3000 tph.

### 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, & .

### 30 50 63 x 53 The "SCSE" Parameter 45 x 37 - SMC Testing

AG/SAG mills for a given feed size distribution and feed rate (Morrell and Morrison, 1996). Hence when using JKSimMet in a design situation, the dimensions of the AG/SAG mill are adjusted until the load in the mill reaches 25 % by volume when fed at the required feed rate. The model predicts the

### A = 69.3, b = 0.54 and Axb = 37.4 (Wtd Fit)

parameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate. In 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 4) Ecs (kWh/t) Weighted Fit 63 x 53 45 x 37.5 31.5 x 26.5 22.4 x 19 16 x 13.2

### SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / 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 ...

### 30 50 63 x 53 The "SCSE" Parameter 45 x 37 - SMC Testing

AG/SAG mills for a given feed size distribution and feed rate (Morrell and Morrison, 1996). Hence when using JKSimMet in a design situation, the dimensions of the AG/SAG mill are adjusted until the load in the mill reaches 25 % by volume when fed at the required feed rate. The model predicts the

### 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.

### (PDF) SAG milling at the Fimiston plant (KCGM) | John ...

Until recently, it was difficult to gauge the dynamic response of SAG mills to changes in the feed size distribution as systems for on-line Burden (m) 5 measurement of the ore size distribution on conveyor belts were either Spacing (m) 5.8 unavailable or unsuccessful for industrial applications.

### USING THE SMC TEST® TO PREDICT COMMINUTION .

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE INTRODUCTION As the SMC Test ® produces the JK parameter values A and b as well as estimates the JK parameter ta and crusher model energy matrices, the SMC Test ® can be used to conduct AG/SAG mill and crusher circuit simulations through the use of JKSimMet. Independent

### FREDA REBECCA SAGMILLING CIRCUIT OPTIMIZATION

respect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W, 2001). 2.2. EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curves.

### Predicting SAG/AG Mill and HPGR Specific Energy ...

changes to feed size distribution through modification to blasting practices and primary crusher operation – so-called Mine-to-Mill approach. 3.2 Mine-to-Mill 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

### SAG Mill Grinding Circuit Design

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 hardware-software'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.

### Feed Size VS Ball Size - Grinding & Classification ...

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!

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