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Technical Cement Forum / proper way to take axial samples in a Raw Mill

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shastrib 14/11/2015 21:22:32

proper way to take axial samples in a Raw Mill

Good Day,

I am experiencing inaccuracies when taking axial samples (crash stop) of a raw mill. Whenever i take samples after the mill has cooled i noticed alot of the fines has settled to the bottom of the charge. Can anyone tell me a proper procedure to take axial samples in a raw mill or probably what am i doing wrong.

Thanks

gks 15/11/2015 02:01:39

Dear ,

If you have have high (fine below 45 micron (10-20 %)) reject material from separator may cover 20 % of top portion of grinding media or YOU have low filling level of grinding media.

Regards

gks

fjalali 15/11/2015 12:13:49

ِDear shastrib,

Please see the attached pictures regarding correct way of axial sampling in a crash stop:

A few explanations:

Need to dig 20 cm under the top material to take samples.
Do this at three points on the width of the mill ( two samples from 0.5 m from sides of the mill and one from middle) and mix them before sieve analysis
Use sieve to separate balls and material but retain material lamps in the sample
Take the minimum sample weight mentioned in the graph

Let me know if you have any other questions.

Regards;

FJalali

Attached files

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shastrib 19/11/2015 18:08:34

thanks for the replies guys but i was speaking specifically for wet slurry mills. i am familiar with taking samples in a cement mill.

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