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AMIT 135 Lesson 3 Particle Size Distribution Mining

The mean size of the material passing the 015mm screen can be estimated assuming the bottom size is 1 micron Particle Sizes Distribution Models There is a common need to determine the amount of material in the feed at a given particle size The desired particle size may not have been included in the original particle size analysis

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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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Application of Operating Work Indices in Autogenous

Then the particle size distribution T2’ can be determined by a simple mass balance ie by subtracting a proportion of the final product P from the AG SAG mill product size distribution T as follows Q2 Q Q1 5 T2’ Q x T Q1 x T1’ Q2 6 Finally the corrected Bond operating work indices for the AGSAG mill and

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ModelAmelunxen SGI

Amelunxen SGI Model This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by Amelunxen 2014 for E SAG and the classical Bond work index equation for E ball substituting CF ball in the place of the Rowland efficiency factors The model requires manual calibration factors for both equations CF SAG and CF ball

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Ball Mills an overview ScienceDirect Topics

where d is the maximum size of feed mm σ is compression strength MPa E is modulus of elasticity MPa ρb is density of material of balls kgm 3 D is inner diameter of the mill body m Generally a maximum allowed ball size is situated in the range from D 18 to D24 The degree of filling the mill with balls also influences productivity of the mill and milling efficiency

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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 A1t

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Choosing a SAG Mill to Achieve Design Performance

SAG mill is an investment that can produce handsome returns if extra production is needed or simply to give the mine the option to mill the hardest ores at design throughput rates Typical tests required to define a hardness variability function are given below in Figure 1

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Grinding Mill Design Ball Mill Manufacturer

The production of fines is low and consequently a rod mill is the right machine when a steep particle size distribution curve is desired A product with 80 minus 500 microns can be obtained in an economical manner SAG Mill vs Ball Mill Ball Motion inside a SAG Mill

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Autogenous and SemiAutogenous Mills ScienceDirect

Some dry autogenous mills operating in Canada are 85 m in diameter and 15 m in length These are known as Aerofall mills The Cadia Hill Australia wet SAG mill is 122 m in diameter with a 20 MW motor and in 2004 was the largest diameter mill in operation in the world

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