Is it necessary to grind raw meal residue 10 -11 % in 90 mic even free lime
in clinker below 2 %
Ted Krapkat
Hello Viswam,
It depends on the mineralogy (mineral reactivity and hardness), PSD and chemistry of your raw mix, as well as your kiln operating parameters (eg stable feed rate, fuel rate, fuel quality, burning zone temperature and kiln inlet O2). All of these things need to be controlled and/or optimised to achieve a low free lime in clinker.
If you have a significant amount of a hard siliceous component such as quartz, then you will need to make sure that you have ground this fraction as fine as is necessary to achieve the desired clinker free lime in your kiln.
Regards,
Ted.