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Bond equation of cement ball mill sizing

News Date:2015-11-12 14:18:52

 1.Cement ball mill sizing method introduction:

The method is used to size a cement ball mill.

Efficiency correction factors are applied with the Bond equation.

The method is valid both for clinker grinding and for raw materials grinding.

This method only gives a rough and initial idea for sizing a cement ball mill. To go ahead, a deeper study is necessary with ball mills suppliers or a specialized engineering office.

Two calculators have been developed for sizing mono chamber mills and two compartments mills.

2 Bond equation and correction factors:                                                               

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       E = specific energy in kWh/t

WI = work index in kWh/t

C = correction factor

P80 = sieve which has 80% of passing in the product

F80 = sieve which has 80% of passing in the feed

Efficiency correction factors are giving by the following equation:                                                                        

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C1, a correction for dry grinding,

C2, a correction for open circuit

C3, a correction for mill diameter,

C4, a correction for feed size,

C5, a correction for product fineness,

C6, a correction for high-efficiency separators.

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The graph below is the basis to get C2:   
   
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