Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
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grinding with AG mill + pebble crusher and ball mill (2 replies and 3 comments)

soheil8
9 months ago
soheil8 9 months ago

hi dears.please help me.

Are there iron ore concentrate plant that use pebble crusher in circulating load of AG mill?

thanks.

 

Alex Doll
9 months ago
Alex Doll 9 months ago
2 likes by soheil8 and David

Your ore breakage characteristics will determine if you need pebble crushing. If the Bond rod mill work index is equal to or greater than the Bond ball mill work index, then you will want to include pebble crushing. Yes, this applies to iron ore too, but many iron deposits do not have this characteristic. Pebble crushers also cause coarser AG product, which might be an issue depending on your downstream process.

But you can't use pebble crushers in SAG circuits because the iron ore and steel balls will confuse the crusher tramp steel protection. Either fully autogenous with or without pebble crusher, or SAG without pebble crushing are valid.

Note that Bond rod mill work index is determined in an apparatus with a wave liner. There are nonstandard apparatus around (mostly in Australia), so what I say won't apply if a rod work index was determined on a nonstandard apparatus.

soheil8
9 months ago

Dear Alex
Thank you.

soheil8
9 months ago
soheil8 9 months ago

in case of SAG mill+Pebble crusher:
can use from separator equipment such as electromagnetic before of crusher?

Alex Doll
9 months ago

Not in iron ore. The magnet can not distinguish between iron balls and iron ore.

soheil8
9 months ago

Ok.

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