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## How to design a Ball Mill (4 replies)

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E= 10 Wi (1/√P80- 1/√F80)E= Specific Energy, Wi= Work Index,P80= Output,F80= Feed

After this we need to multiply certain factors such wet/dry Factor, Separation Factor, Dia. factor, Open/Closed Circuit Factor etc..

E= 10 Wi (1/√P80- 1/√F80 * C1*C2*C3*C4*C5*C6After This we multiply throughput Volume (Q)

Specific Power (P)= QEwhich gives Total Power consumption (KW).We assume Critical Speed as 70% of Nominal RPM with 30% of Grinding Charge.

Question1:- How do we determine Nominal RPM optimum for Grinding?

Question2:- How do we determine Dia. Of Mill?

Question3:- How do we determine Length. Of Mill?

Question4:- How do we determine L/D ratio for wet closed Mill with specific throughput?

Question5:- How do we determine the F80 for Grinding Mill so that the P80/P68 is in 106/75 microns?

Question6:- Does Length & Diameter determine Critical Speed/ Nominal RPM?