冷却方式对熟料矿物及C_(3)S晶型的影响

Effects of Cooling Methods on Clinker Mineral and C_(3)S Crystal Form

C_(3)S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C_(3)S含量影响,与C_(3)S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1450℃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C_(3)S含量提高,β-C 2S、C_(3)A及C 4AF含量降低,铝率较大生料的冷却速度对C_(3)S、C_(3)A含量影响更显著;冷却方式不同,C_(3)S晶型不同,液氮冷却和空气冷却时C_(3)S多为M1或M3型,随炉冷却时C_(3)S多为T型,冷却速度减慢使C_(3)S晶型从M型向T型转变。

C_(3)S 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 C_(3)S,but also directly related to the C_(3)S 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 1450℃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 C_(3)S content in the clinker increases,and theβ-C 2S,C_(3)A and C 4AF content decreases.The cooling rate in the raw material with a larger aluminum ratio has a more significant impact on the C_(3)S and C_(3)A content.The crystal form of C_(3)S is different under different cooling methods.The C_(3)S is mostly M1 or M3 type under liquid nitrogen cooling and air cooling,and the C_(3)S is mostly T-type under furnace cooling.The slow cooling rate makes the crystal form of C_(3)S change from M-type to T-type.