Sag Mill Feed Size Distribution

(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.

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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. The operation of SAG mills is

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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

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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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THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG AND SAG

will become the predictions. In the case of SAB/SABC circuits the transfer size is the product of the SAG mill circuit and the feed of the ball mill circuit. Hence if power-based equations such as

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SAG Mill goldcilplant

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.

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Selection of Comminution Circuits for Improved Efficiency

In addition, the size distribution and grinding circuit chemistry may impact on the performance of the downstream circuit (Lane, 1999 and Rantanen, 1996). Fully autogenous circuits are attractive due to the elimination of steel media costs. Typically, a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t. Providing the

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

match the specific energy required for an existing or a planned AG/SAG mill due to differences in the many operating and design variables such as feed size distribution, mill dimensions, ball load and size and grate, trommel and pebble crusher configuration. However, the “Standard” circuit specific energy

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SAG Mill goldcilplant

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

Selection of Comminution Circuits for Improved Efficiency

In addition, the size distribution and grinding circuit chemistry may impact on the performance of the downstream circuit (Lane, 1999 and Rantanen, 1996). Fully autogenous circuits are attractive due to the elimination of steel media costs. Typically, a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t. Providing the

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30 50 63 x 53 The “SCSE” Parameter 45 x 37

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

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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.

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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.

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STARTLING EFFECT OF BALL SCATS REMOVAL ON SAG MILL

The Std. JK size distribution is that taken from ball size distributions measured from dumping and sizing the whole charge of production SAG mills, Morrell (1993). The mill with scats had a considerably finer size distribution, and notably lacks ball in the 40mm to 60mm size range. This is the size at which the porosity is exposed, and they

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A Method of C alculating Autogenous/ Semi-Autogenous

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 log-log paper. This is because the particle size distribution (PSD), these mills

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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

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A thesis submitted for the degree of Master of Philosophy

Development of an AG/SAG mill batch test methodology Naren Vijayakumar B. Eng. (Chemical) A thesis submitted for the degree of Master of Philosophy at The University of Queensland in 2015 Sustainable Minerals Institute Julius Kruttschnitt Mineral Research Centre . i Abstract Autogenous grinding (AG) and semi-autogenous grinding (SAG) mills are installed in the majority of comminution circuits

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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.

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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

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SAG/AG SCU Millwatch

SAG/AG SCU SAG/AG Sentinel Camera Unit (SCU) Concept of System. The SCU uses the latest technology in high-definition imagery within a custom designed housing, permanently affixed to the feed chute to provide a live audio and temperature feed in a running SAG mill and video feed from inside a stationary SAG mill.

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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. The −6″ +1″ (−152

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Sustainable Optimisation of the Bell Creek SAG Mill

In SAG mills, however, the feed ore is used as a significant portion of grinding media. Therefore, a change in feed size distribution or hardness can result in a noticeable difference in breakage characteristics, which impacts the charge level and mill power draw. Hence, SAG mills tend to have a much wider range of variability in power draw than

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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 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

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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

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Throughput optimisation in milling circuits

SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification hydro-cyclone variables (feed density, flow and pressure) and water feed rate to the sump. Model predictive control (MPC), which is a multi-input multi-output (MIMO) controller, is very suitable for this purpose. If a particle size analyser is installed it can be

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Model:Morrell SMC SAG SAGMILLING.COM

F 80, µm is the 80% passing size of the fresh feed to the circuit (expected to be a Bond-compatible size distribution). P 80, µm is the 80% passing size of the circuit product (expected to be a Bond-compatible size distribution). Availability, expressed as a decimal (0.90 = 90% availability) is used to convert t/h to t/d. Ball mill Operating

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THE OPTIMAL BALL DIAMETER IN A MILL

in a mill should be proportional to grain number N having the definite diameters which they can grind: N b ~ N. (7) The number of grains of the material with determined diameters depends on the grain size distribution. For a great number of materials the grain size distribution at the ball mill feed has been described by Gaudin-Schumann’s

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EFFECT OF BALL SIZE DISTRIBUTION ON MILLING PARAMETERS

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 mono-size grinding media 44 3.3 Feed material preparation 46

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