High temperature calcination and rapid cooling are important measures to improve the quality of cement clinker, in this paper, we talk about the high temperature for calcining what important influence on the quality of cement clinker.
When the calcination temperature from 1350 ℃ to 1400 ℃ and 1425 ℃ respectively, 3 d, 7 d and 28 d compressive strength from 23.6 MPa, 41.3 MPa and 41.3 MPaMPa were increased to 27.2 MPa, 44.0 MPa, 57.9 MPa and 41.4 MPa, 59.2 MPa, 59.2 MPa.
An alkali content of cement limestone is a bit high, to reduce the calcination temperature and improve some performance of cement, mixed with 1% sulfuric acid residue in the limestone, clinker SO3 in rose 0.2%, a 0.12% increase in the content of MgO style, the results of clinker heat consumption decreased 80 kj/Kg, kiln cylinder surface temperature drop 19 ℃, yield increased by 1.4 t/h, but the intensity of 7 d is decreased by 0.7 MPa, 28 d intensity fell by 3.5 MPa. This shows that calcination temperature decreased, the strength has gone down.
Why high temperature calcination can increase clinker strength? Liming heavy industry experts are analyzed.
1. The high temperature calcination can raise the content of the silicate minerals in the clinker, increase the content of A mine. High calcination temperature can burn SM higher material and silicate mineral content increased, so also can improve the content of A mine. Mainly the following response: in the process of clinker burning C2S + CAO – > C3S. Mine is A solid solution A few Fe2O3, Al2O3 and MgO style C3S. Calcination temperature increase can promote the reaction, reduce the F – increase the C3S CAO. As you can see on type, reduced by 1 per mole CAO can increase 1 mole C3S. If the meter by weight, each 1% reduction in F – CAO, can increase 4.07% C3S.
2. High temperature calcination can improve the activity of A and B mineral water hard. Calcination temperature is high, in addition to related to A mine content, may also be related to the activity of A and B ore increase. Study shows that the calcination temperature increase, A mine from M to M Ⅲ Ⅰ type transformation. M type Ⅲ early hydration slower, but after 3 d slurry density, strength increased. When the calcination temperature increased from 1400 ℃ to 1400 ℃, C3S 3 d, 7 d and 14 d and 28 d compressive strength from 13.0 MPa, 18.3 MPa, 25.6 MPa, 30.0 MPa to 32.5 MPa, respectively 52.3 MPa, 52.3 MPa and 52.3 MPa. Thus, calcination temperature on the strength of the C3S effect is obvious. Calcination temperature from 1400 ℃ to 1400 ℃, strength increasing obviously, the 3 d, 7 d, 14 d and 28 d compressive strength from 0.8 MPa, 1.7 MPa, 2.2 MPa and 6.5 MPa to 1.8 MPa, 4.6 MPa, 10.2 MPa and 30.8 MPa.
3. The high temperature calcination can reduce contains the actual content of aluminum phase, thus reducing its water consumption standard consistency, improve its adaptability with water reducing agent. Calcination temperature increase besides can reduce birth under-burnt clinker or light under-burnt clinker, still can make the liquid viscosity, iron phase can dissolve into more Al2O3, make the iron phase transformation from C4AF to C6A2F, thereby reducing C3A content. C3A content of reducing water consumption can reduce cement standard consistency, and improve its adaptability with water reducing agent.
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