77 posts

### Re: Request for feedback for a Two Chamber Cement Mill Ball Charge and Longitudinal Sieve Analysis

As per your given mill details.(mill output assumed to be 45 tons / hr) for more details you can contact me at** vikprocem@gmail.com** It is not so easy to understand the cement plant without being present at site. But, still according to my calculations- - The size of your first chamber grinding media seems to be more.

- Max ball size should be upto 70 mm

*Data entry - Yellow cells*

Mill tube Length Mts. | 11.00 | |

Mill tube Dia. Mts. | 3.4 | |

Mill liner size Mts. | 0.14 | |

Partition Wall size Mts. | 0.7 | |

Nos of partition | 1 | |

First comp. Length ( effect) Mts. | 2.3 | |

First Comp. Useful Mill Dia. Mts | 3.23 | |

Second comp. length ( effect) Mts. | 8 | |

Second Cmp.Useful Mill Dia. Mts | 3.27 | |

Third comp. length ( effect) Mts. | 0 | |

Third Comp. Useful Mill Dia. Mts | 0 | |

Mill RPM | 17.2 | |

Size in microns, 80% of mill feed pass F | 11000 | |

Bond's works index of mill feed, size Wi | 13.49 | |

Specific gravity of mill feed. S | 3.09 | |

Volume of first Comp. M3 | 18.84 | |

Power demand cal. 1st Comp | 399 | |

Volume of second Comp.M3 | 67.15 | |

Power demand cal. 2nd Comp | 1389 | |

Volume of third Comp.M3 | 0 | |

Power demand cal. 3rd Comp | 0 | |

Power demand total. Kw ( Aprox) | 1824 | |

Useful Mill Length Mts | 10.3 | |

Material retaintion time min | 6.3 | |

Mill Critical Speed | 23.54 | |

Mill speed of critical speed % | 73.07 | |

First compartment | ||

% of filling first compartment | 32.7 | % |

Grinding Area of first Comp. % | 21.9 | % |

Compartment Volume M3 | 18.8 | M3 |

Total Bulk Weight of balls | 28.5 | tons |

Bulk density of all balls. | 4.631 | t /d m3 |

Bulk Volume | 6.2 | M3 |

Total Numbers of Balls | 34559 | #s |

Nos. Of ball impact/ revolution. | 61861 | Impacts |

Nos of Ball impact / sec | 17733 | Impacts |

Material retaintion time ( min ) | 1.41 | min |

Average Ball Weight | 0.8 | kg |

Ball Surface/Comp. Volume Ratio | 27.1 | |

Second compartment | ||

% of filling second compartment | 29.8 | % |

Grinding Area of second Comp. % | 78.1 | |

Compartment Volume M3 | 67.15 | m3 |

Total Bulk Weight of Balls | 98.0 | tons |

Bulk density of balls. | 4.89 | t / dm3 |

Bulk Volume | 20.03 | m3 |

Total Numbers of Balls | 3564486.2 | #s |

Nos. Of ball impact / revolution. | 6380430 | Impacts |

Nos of Ball impact / sec | 1829057 | Impacts |

Material retaintion time ( min ) | 4.89 | min |

Average Ball Weight | 0.027 | kg |

Ball Surface/Comp. Volume Ratio | 80.0 | |

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81 posts

### Re: Request for feedback for a Two Chamber Cement Mill Ball Charge and Longitudinal Sieve Analysis

Hey all my email is:

I would be happy to send you my calculationa andexcel data sheets.

Regards;

Fara

81 posts

### Re: Request for feedback for a Two Chamber Cement Mill Ball Charge and Longitudinal Sieve Analysis

Regarding the questions asked:

__Closed Circut.__

__Steel Balls__

(could be ceramic sometimes for white cement)

are you producing several different products?

__One type white cement wth around 4000 blain__

__Dont Have__

how does the separation curve looks like,

how much is the bypass ratio,

circulating load, ....

what are the raw materials and the recipe?

__95% clinker and 5% gypsum__

what is the fineness of the cement

__Around 4000 blain__

particle size distribution of the cement, ...

__Very__

__little__

__Dont__

__have__

particle size distribution of the separator feed, reject, product?

and what is the current rotation speed?

Is D80 related to the feed or the product?

__Feed__

Some people write P80 when it is the product and F80 for the feed !

What do you mean by Pc, for example?

__Percent__

__of__

__critical__

__speed__

What are s or K?

Also show all the units in your data, I guess D80 is in µm?

__Yes__

What do you call "critical speed", and what are the units?

Attaching an Excel file would be the easiest way.

I attached the formula and excel sheet. I dont have any data regarding the seperator.

26 posts

### re Re: Request for feedback for a Two Chamber Cement Mill Ball Charge and Longitudinal Sieve Analysis

Dear experts,

could you please, send me a excel calculation sheet to calculate ball charge optimization for two chamber cement ball mill .

mail ID tonogl77@gmail.com

thank you in advance

BR