Grinding & Classification Circuits

Grinding & Classification Circuits2018-06-17T09:51:34-04:00
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Comminution tests for new deposit for existing process plant (2 replies and 2 comments)

2 months ago
Millza79 2 months ago

For an existing concentrator (with existing installed crushers and mills) where a new deposit is being locked at. What comminution tests should you do?

I would have thought SMC and BBMWI are a must, with maybe UCS and crushing impact tests also important.

I would have though abrasion tests are much less important. Particularly if there is going to be no new equipment capital invested. 


Todd H
2 months ago
Todd H 2 months ago

I would do the tests that represent the equipment:

Crusher work index, abrasion index

Bond Tests if you have a rod or ball mill and SMC or other SAG tests if it is a SAG.  UCS is low on my list of usefulness but it is cheap so maybe worth it.  


Todd Harvey - Global Resource Engineering

2 months ago

Thanks Todd

Alex Doll
2 months ago
Alex Doll 2 months ago

You need to establish an energy model for your existing circuit and your existing ore, so make sure you have a database for your existing orebody you can extend.  Do at least one test that is:

1. in the coarse size, either Crushing Wi, point load index, or UCS.

2. in the medium size class, any of Bond rod Wi, SMC, SGI/SPI™, or SAGDesign.

3. in the fine size class do the Bond ball Wi, but run tests twice at two closing size classes.

If you establish the the new ore is roughly equal to your existing ore in these three size classes, then you are done -- just feed it in.  If any one of the three size classes gives different results, then you need to do some detailed calculations (and it might be good to get help!). 

Example:  if the current ore has RWi <> BWi, then you are going to have a pebble problem in the new ore.  Your circuit (grates, etc) needs to be modified to cope with the new situation.

Alex Doll
2 months ago

hmm, the parser screwed up the maths. It was supposed to say "current ore RWi much less than BWi, but new ore RWi much greater than BWi", then...

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