Coarse grinding with ball mill - Grinding & Classification Circuits - Metallurgist & Mineral Processing Engineer

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Coarse grinding with ball mill (5 replies and 4 comments)

6 years ago

kfalus 6 years ago

Hello Dear Experts,

I bought a new ball mill which's 900x3000 size. I am planning to grind river sand that has %60 silica in it's chemical proportion. But for me it's unnecessary to grind very fine like 600 micron or near, I just want to receive 0-3 mm final product.

My feed size is : 3 mm . to 25 mm.

40% 3mm to 10 mm

30% 10 mm to 20 mm

30% 20 mm to 25 mm.

How can I adjust the retention time of my ball mill to prevent it grinding very fine. Actually I am wishing to increase capacity of it by not grinding finer product.

Thanks in advance

Best Regards

Kemal Firat ALUS

babygenius76

6 years ago

babygenius76 6 years ago

I hope you did not buy the ball mill for this purpose only? You did not need a ball mill to obtain this coarse of a discharge. I assume based on your question that your ball mill does not have a classifier. You will need to sieve the ball mill discharge to ensure the particle size distribution (e.g., 0 to 3 mm) that you want. You can get your required results with a crusher and sieve in a closed circuit.

kfalus

6 years ago

One of my products is 0-500 microns. The Other one is 0-3 mm
I want to use my ball mill to produce both of them. Ofcourse I am using a rotary screen to get what I want but my main question is the residence time. While I am grinding 0-3 mm product may I reduce the residence time by increasing product feed or increasing water flow into the mill ?

babygenius76

6 years ago

babygenius76 6 years ago

If you are using a separate rotary screen to classify the discharge, then you can gradually play with increasing the feed rate to the ball mill. It will take some trial and error and your final calculations on desired feed rate will be more qualitative than quantitative.

kfalus

6 years ago

thank you

Alex Doll

6 years ago

Alex Doll 6 years ago

Unfortunate that you bought a ball mill, that is not the correct equipment for such a coarse feed. You should have bought a rod mill instead; ball mills are inefficient with feed above about 10 mm.

As bg76 said, your classifier will be used to pull off your product sizes. The only two ways you can control how much grinding is done is by varying the ball charge level (which can take weeks to decline if you use natural ball wear) and the ore feed rate. If you see too coarse a grind, then you slow down the feed rate and/or increase the ball charge.

https://www.sagmilling.com/

kfalus

6 years ago

Thank you for your response Alex. The company told me that I can feed <=25 mm into this ball mill. What if I remove balls and install rods instead ? Would it work ?

Morteza Mousavi

6 years ago

Hello guys. I read comments and i think it performs unsuitably. because of mill length it can not be possible.

kfalus

6 years ago

kfalus 6 years ago

this is the inside

https://www.911metallurgist.com/wp-content/uploads/2018/08/WhatsApp-Image-2018-08-24-at-19.04.22.jpeg

David

6 years ago

David 6 years ago

Hydrocyclones or spiral classifier?

What diameter top size ball?

Installed kW and utilized kW?

Operating %Solids?

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