石灰石中氟磷灰石对水泥熟料烧成和强度的影响

Effects of Fluorapatite in Limestone on Burnability and Compressive Strength of Cement Clinker

研究了非洲一种石灰石中的氟磷灰石对水泥生料的易烧性、熟料矿物组成、矿物形貌和强度发展的影响。结果表明，在1300℃和1350℃时，随着熟料中P2O5含量的增加，氟磷灰石对生料易烧性改善显著；在1400℃和1450℃时，熟料中P2O5含量的增加对生料易烧性改善不明显。熟料中P205含量为0．05％-1．50％时，熟料矿物相中A矿较多。矿物晶形发育良好。熟料中P205含量为2．00％-5．00％时，A矿形状不规则，大小不均匀。随着熟料中P2O5含量的增加，熟料中C3S、C3A和CAF含量趋于减少，水泥3d强度和28d强度都逐渐降低。熟料中P205含量为0．05％-1．50％时。生产出的水泥均可满足42．5级普通硅酸盐水泥国家标准中对强度的要求。结合生料易烧性、熟料矿物岩相及水泥强度实验分析认为，熟料中P2O5含量宜控制在1．50％以内。

Effects of fluorapatite in limestone from Africa on burnability, mineral composition, mineral morphology and compressive strength of the clinker are analyzed. It is found that with the increase of the P2O5 in clinker, the effect of fluorapatite on improving bumability of raw meals is positive and significant at 1300℃ and 1350℃, and not obvious at 1400℃and 1450℃. The content of C3S, C3A and C4AF in clinkers decrease with the increasing of the P2O5 content. When the content of P2Os in clinker is between 0.05% and 1.50%, the significant amount of well-developed alite is formed. When the content of P2O5 in clinker is between 2.00% and 5.00%, alite is mainly irregular and inhomogeneous. The strengths of cement pastes at 3d and 28d would have a gradual decline with the increasing of the P2O5 content. When the content of P2O5 in clinker is not more than 1.50%, cements produced may meet the strength requirements of 42.5 Portland cement national standards. It is analyzed that the amount of P2O5 in clinker should not be more than 1.50% combined with burnability of raw meals, microstructure of the clinker and strength of the cement.