Re: high free lime
A decrease of one of the following parameters will decrease the free lime by approximately 1% at 1400 degree centigrade (This is only strictly correct if it were possible to change one parameter without affecting the others):
0.5 Silica Modulus or,
2% Coarse Calcite +125 micron or,
1% Coarse Quartz +45 micron,
will decrease clinker free lime by 1% total at 1400 degree centigrade.
Finer grinding will help to reduce Coarse Calcite minerals.