Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
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how to select the best comminution circuit (4 replies)

8 months ago
mohamedkrafi 8 months ago

I want know if you have an idea about the best  comminution circuit selection basing on Ore hardness and competency (SABC, AG, ROMBALL MILL)

we have two type of ore compétent and hard (AxB=24, ball work index = 18) and moderate and soft  (AxB=40, work index 9,5 ) the final size 100 microns the mine start with  moderate and soft ore

Is there other tests that SMC test to choose AG ?

What is this check to choose ROMBALL MILL ?

7 months ago
David 7 months ago

What plant tonnage are you considering?

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7 months ago
mohamedkrafi 7 months ago

hi dear david

the tonnage 3000 Ton/day

best regards


7 months ago
David 7 months ago

That sounds like a fun one. Would you be able to truly blend/mix the AxB=40 and the AxB=24? Otherwise, it is a pretty broad range for a SAG/AG mill to cover.

If you cannot, my personal choice (not necessarily the best) would be to consider on a small 3000 TPD plant like this; jaw or gyro crushers, rod mill + ball mill or maybe no rod mill and just a grate discharge ball mill with an oversized cone crusher ahead of it (if material characteristics allow).

This would give you a more predictable tonnage. I am more an operator than a designer. 

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7 months ago
Robert 7 months ago
1 like by David

There has been a good discussion of this subject in recent years. Much of this has been summarised in a matrix fashion with axes the major factors to consider and secondary factors discussed within each of the cells. Discussion centers around considerations underlying the analysis and to be considered in practice. Some papers outlying this include.

Lane, G.S., Selection of comminution circuits for improved efficiency, Crushing and Grinding Conf., Kalgoorlie, 2002.

This paper examines the design of comminution circuits and the issues that impact on comminution circuit efficiency.

Circuit efficiency is discussed, principally from the perspective of power efficiency. However, operating efficiency, maintenance efficiency, capital expenditure and return on investment are often the key efficiency factors in project development outweighing power efficiency considerations.

Comminution circuits have progressed from circuits comprising simple crushing machines, for example stamp batteries, through multi-stage crushing and staged grinding, to single stage crushing and semi-autogenous grinding (SAG) and ball mill (SAB) circuits. This progression has, not necessarily, been accompanied by an improvement in the efficiency of power utilisation in achieving the target grind size, but has seen an improvement in the overall efficiency of mineral processing as measured by the overall cost of grinding to the required size for effective downstream beneficiation of the value metal or mineral.

In the future, projects that add value by improving power efficiency and reducing CO2-equivalent output may earn Emission Reduction Units (ERU's). The value of an ERU is hard to predict and the achievable reduction will be a function of comminution technology and site specific factors such as the method of power production.


Putland, B., Comminution circuit selection – key drivers and circuit limitations, SAG 2006, Vancouver, 2006.


This paper reviews the techniques available to reduce the number of options that should be considered in the scoping or pre-feasibility phase of comminution circuit selection and presents a method to follow in doing so.

Primary drivers of circuit selection include intended plant capacity as a function of maximum individual equipment capacity limits; the influence of ore characteristics on viable circuit selection and product size requirements.

A matrix linking capacity, grind size and ore characteristics is presented as a guide to this first step in the process of comminution circuit selection.

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