use of feldspar & flourspar in white cement

dear all

we are using 100% petcoke in fuel for white cement.

my question is why we use feldspar & flourspar in raw mic.

also we are grinding raw mix upto 10% on 90 mic. but adding to the mill inlet powdered feldpar (2% retn. on 90 mic.) 

Is there any impact on the output of the ball mill as above.

Can we feed it to final product instead of mill inlet.

If we intergrind feldspar of 10mm size in the mill as such does we get the desired output?

Does feldspar has to be grinded separate very fine? If yes than why? Is it due to Quartz or else.

I think flourspar is for better burnability ? what is the limit of dosing flourspar & what are the advantages & disadvantages of it?

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re use of feldspar & flourspar in white cement

Fluorspar is added to help the combination of the kiln feed into the white cement clinker so reducing the fuel (pet coke) consumption of the kiln. Feldspar is added to correct the alkali:sulphate balance in the kiln. Petcoke is high in sulphur so the feldspar provides additional alkali to balance that. As the feldspar is finer than the raw mill product it can be added to the mill exit rather than the mill inlet.

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re use of feldspar & flourspar in white cement

what is the limit of addition of feldspar & flourspar ?

does these materials make any problem to the process & quality ? how?

x

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