掺SO_3硅酸盐水泥熟料中矿物相形成过程研究

Phase Formation of SO_3 Doped Portland Cement Clinker

研究了工业原料配料生料中SO3含量为3%时,熟料主要矿物形成过程与含量变化。重点观察了C4A3$(硫铝酸钙)在烧成过程中的变化情况。借助DSC-TG,X射线衍射法及岩相分析对水泥熟料的烧成过程进行了研究。结果表明,熟料中,C4A3$在1050℃时即可形成,1290℃开始分解为C3A和C$;1350℃后C3S开始大量形成,1450℃取出急冷,f-CaO的含量小于1%,熟料中有6.2%C4A3$。1450℃保温不同0.5 h后,C4A3$完全分解。对熟料矿物形成量进行理论计算,结果与实验结论一致。

Impact of the addition of 3% SO3 on the formation of cement clinker minerals in industrials clinker was investigated. Variation of the C4A3 $ during sintering process was taken into account. Sintering process of the cement clinker was investigated with DSC-TG, X-ray diffraction and microscopic analysis. Results showed that with a higher SO3 content existed, C4A3 $ could formed at 1050 ℃ and decomposed to C3A and C $ from 1290 ℃ ; C3S formed after 1350 ℃ and f-CaO content dropped to 1% at 1450 ℃. The final clinker had 6.2% C4A3 $. C4A3 $ decomposed completely when held for 0.5 h at 1450 ℃. Calculation of the theoretical mineral formation was in agreement with the above conclusions.