冷却方式对熟料矿物及C3S晶型的影响

C₃S矿物是熟料的主要成分,是水泥熟料强度的主要提供者,熟料的强度不仅受C₃S含量影响,与C₃S晶型也直接相关。为研究冷却方式式对熟料矿物成分和晶型结构的影响,将不同水泥厂工业生料经制样烘干后在1 450 ℃下煅烧保温30 min,采用液氮淬冷、空气快冷和随炉慢冷的方式制备熟料。通过TG-DSC、XRD、Rietveld全谱拟合、岩相分析等对熟料矿物组成、含量、晶型、形貌以及固溶情况进行分析。结果表明:冷却速度加快,熟料中C₃S含量提高,β-C₂S、C₃A及C₄AF含量降低,铝率较大生料的冷却速度对C₃S、C₃A含量影响更显著;冷却方式不同,C₃S晶型不同,液氮冷却和空气冷却时C₃S多为M1或M3型,随炉冷却时C₃S多为T型,冷却速度减慢使C₃S晶型从M型向T型转变。

Effects of Cooling Methods on Clinker Mineral and C3S Crystal Form

C₃S mineral is the main ingredient of clinker and the main provider of cement clinker strength. The strength of clinker is not only affected by the content of C₃S, but also directly related to the C₃S crystal form. In order to study the effects of cooling methods on the mineral composition and crystal structure of the clinker, the industrial raw materials from different manufacturers were calcined at 1 450 ℃ for 30 min, then quenched by liquid nitrogen immediately, cooled by air quickly and cooled slowly with furnace. The mineral composition, content, crystal form, morphology and solid solution of clinker were analyzed by TG-DSC, XRD, Rietveld method and petrography analysis. The experimental results show that the cooling rate increases, the C₃S content in the clinker increases, and the β-C₂S, C₃A and C₄AF content decreases. The cooling rate in the raw material with a larger aluminum ratio has a more significant impact on the C₃S and C₃A content. The crystal form of C₃S is different under different cooling methods. The C₃S is mostly M1 or M3 type under liquid nitrogen cooling and air cooling, and the C₃S is mostly T-type under furnace cooling. The slow cooling rate makes the crystal form of C₃S change from M-type to T-type.