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How to get finer P80 grind (9 replies and 4 comments)
You might consider adding a graded charge of balls into your ball mill to reduce the average size of the balls for better fine grinding. You could substitute up to 30% of your charge with smaller balls. I would try say 10% of your charge weight with 30mm or 40mm forged balls (high chrome for endurance) and see if it helps. If it improves your grind, gradually increase the weight of the smaller balls. I am assuming that you are getting good reduction in your SAG mill. If you are feeding the ball mill too large of particles, you will not get the expected grind out of your ball mill. If your SAG is not performing and leaving a large circulating load, you might need to consider a scalping screen and add a pebble crusher to the circuit. More information is needed to analyze your milling circuit, such as suggested by Bill Fraser.
If you can provide some fundamental information I can give you an idea of what capacity each milling stage can handle and if there is scope to reduce the P80 from the cyclones:
- Mill inside shell dia x effective grinding length for both mills and motor sizes
- Bond ball mill work index
- Drop weight index or Axb product
- Unconfined compressive strength
- SPI
- Bond crushing work index
Hi Alaz,
Your issue is definitely something we can assist with by running simulations in our software. Generally however more information will be required.
If it is not against the groups policy I would like to put one of our team in touch with you and most likely arrange a site visit/audit to discuss in person.
Please let me know which country you are in and how we can get in touch with you.
Guys, biz-dev is OK if accompanied with useful help. Thank you all for your help.
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thank you for helping me i will try to answer all your questions
What are your SAG & ball mill dimensions?
- ball mill 9.3*6.2
- and sag mill 7.9 *5.2
What are your SAG & ball mill motor installed kW?
- our motors are 5500 kw
Do you have a BWi #?
i'm not sure what are talking about
What dimensions are your SAG grates & trommel?
- trommel cut point is 16mm
The suggestion given by Richard is practical & I would also like to add thta- Please check your gratings in the SAG mill , maybe it is worn out and needs repair.
Krishna
hello everyone
my problem is we hardly get 80% smaller than 75µm
we have a SAG mill and ball mill and we are running 300 TPH
my question why we are not getting 80% smaller then 75µm ?
thank you.