Influence Of External Oxides On Clinker Firing

The burning energy consumption of traditional silicate cement is large with a highsintering temperature of clinker. Therefore, improving the burnability of clinker is oneof the main way to reduce the energy consumption of cement. This paper discussed theinfluence of external oxides on the burnability of raw material in order to provide thebasis for seeking the material improving the burnability of high calcium raw.The base raw material are made with CaCO₃, SiO₂, Al₂O₃, Fe2O₃（KH=0.9,SM=2.6, IM=1.6）, and added with10oxides in different content, calcined in1250℃,1300℃,1350℃,1400℃and1450℃, study the influence with content of thef-CaOcement clinker. Through experiment to study the influence on activation andthe formation kinetics ofC3S, we can find out the effective element affecting theburnability of clinker and guide the practice. First of all: V₂O₅, TiO₂, MoO₃, CuOcalcined at different temperatures and different dosage under the clinker contentanalysis of f-CaO, then the results show that:①V₂O₅have some effect onburnability, When the content of V₂O₅is about0.4%, the improving of calciumburnability was better, but the activation and the formation kinetics ofC3S has littleeffect.②TiO₂have good effect on burnability, added TiO₂can greatly increase theactivation and the formation kinetics ofC3S.③The effect of added MoO₃is notobvious, also about the activation and the formation kinetics ofC3S.④CuO hasevidently positive in lower temperature, and with the incorporation of increased firingactivation gradually decreased.The brnability of raw material studied with the external oxides, such as V₂O₅、TiO₂、MoO₃、CuO、Co₂O₃、ZrO₂、BaO、La₂O₃、MnO₂、CdO. The results showthat:①The effect was concluded as following: Evidently positive in low temperaturebut no observably positive or negative in high temperature, such as CuO, BaO, Co₂O₃;No markedly positive in low temperature but evidently positive in high temperature,such as TiO₂, ZrO₂, CdO, La₂O₃; No markedly positive both in high or low temperature, such as MoO₃, MnO₂, V₂O₅.②Elements of the same or similar impact onburnability, the effect are similar: ⅠB, Ⅷ elements: significant effect at lowtemperatures, but at high temperatures the effect is not obvious.（2） ⅢB, ⅣB elements:little effect at low temperature, obvious effect in high temperature.（3） ⅤB, ⅥB, ⅦB:effect are not obvious at low or high temperature.