Hi Pratik,

Sixty tons per hour is a good product stream. Calcium carbonate is a soft material. At 8 hours per day you are already in batch process in one sense of the word.

5 to 10 micron is respirable dust - which means you can breath it into your lungs. There is no reason why you couldn't get a continuous mill to do that. Are you talking wet or dry grinding?

My first approach is to get on the phone to a Crushing Plant Vendor like Norberg. Even if the agent doesn't handle a machine for your application, they will know who to contact (they do this stuff in their sleep).

You are thinking one machine at 60 tph to cut powder to 5, 8, 10 and 20 micron. That is a big ask - four different underflow streams, each perhaps DN 25 tube size. Sounds like you'd be talking dry product.

How long have you been waiting for the answer? Remember the Blackberry 12 hour blackout? Internet is fine. Talking to warm bodies at the other end of the phone will get you answers a whole lot quicker.

Sgt John Rozentals

CEO Bionic Research Institute

www.latviantourists.com.au ■

Are you in the process of making white Calcium Carbonate powder for use as a coating material for paper or as an ingradient of paint? Is retaining color importatnt for your final product?

What is the source / type of raw Calcium Carbonate to be milled? What is feed size to the mill? ■

Good question Vinayak,

With some product, if you overgrind, you break some of the inclusions in the mineral, and the grind starts to change colour, or become "grey".

Regards - John.rz ■