Method for producing a clinker for hydraulic cement with low CO
A method for producing a clinker for cement, comprising grinding a raw flour comprising, especially, Al 2 O 3 , Fe 2 O 3 and SO 3 in contents such that the formula for calculating SO 3 content of=0.261×Al 2 O 3 −0.638×Fe 2 O 3 +k, where 2.5<k<3.5, then by sintering flour in an overn wherein the temperature is between 1250° C. and 1350° C. and oxygen content is between 2.5% and 10% by volume.
1. A process for the manufacture of a clinker for cement, comprising grinding a raw meal comprising Al 2 O 3 , Fe 2 O 3 , and SO 3 in contents such that the formula for calculating SO 3 content is SO 3 =0.261×Al 2 O 3 −0.638×Fe 2 O 3 +k, where 2.5≦k≦3.5, and sintering said raw meal in a kiln where temperature is between 1250° C. and 1350° C. and where the oxygen content in the kiln is between 2.5% and 10% by volume, wherein the Al 2 O 3 content is between 3.0% and 10% by weight and the Fe 2 O 3 content is between 0.5% and 2.0% by weight.
2. The process as claimed in claim 1 , wherein the oxygen content in the kiln is between 4% and 8% by volume.
3. A clinker composition, comprising:
from 30% to 70% by weight of alite (C 3 S),
from 10% to 40% by weight of belite (C 2 S),
from 5% to 15% by weight of calcium sulfoaluminate (C 4 A 3 S),
from 1% to 7 Z % by weight of ferrite (C 4 AF),
from 3% to 10% by weight of anhydrite (CS), and
the remainder being composite of lime and/or of C 3 A.
4. The composition as claimed in claim 3 , further comprising from 0.1% to 1.5% by weight of fluorite (CaF 2 ).
5. The composition as claimed in claim 4 , wherein said composition comprises from 0.2% to 1% by weight of fluorite (CaF 2 ).