利用铜尾矿作硅质原料制备硅酸盐水泥熟料的研究

Preparation of Portland Cement Clinkers by Utilizing Copper Tailings as Siliceous Material

利用铜尾矿作硅质原料,配制了不同率值的硅酸盐水泥生料,在不同温度(1350℃、1400℃和1450℃)下进行煅烧,得到了相应的硅酸盐水泥熟料样品。利用乙二醇-乙醇法测定样品中的游离氧化钙f-CaO研究了水泥生料的易烧性,利用差示扫描量热仪(DSC)测试生料的吸放热峰研究了铜尾矿对水泥矿物形成温度的影响,并通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了熟料的矿物组成和微观结构。结果表明,与砂岩配料相比,采用铜尾矿作硅质原料配料烧制硅酸盐水泥熟料时,液相出现和C 3S开始形成的温度均更低,生料的易烧性更好。熟料石灰饱和系数(KH)低于0.92,1400℃的煅烧温度下即可制备出f-CaO符合标准要求的硅酸盐水泥熟料,C 3S的尺寸约为20μm,熟料的结构更加致密。

Portland cement clinkers with different clinker modulus were prepared by utilizing copper tailings as siliceous material at different calcination temperatures(1350℃,1400℃and 1450℃).The sinterability of cement raw meal was investigated by the determination of f-CaO in the sample by ethylene glycol-ethanol method.Effect of copper tailings on mineral formation temperature was researched by differential scanning calorimetry(DSC).Mineral composition and microstructure of clinkers were also analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results show that,compared with sandstone,when copper tailings are utilized as siliceous material to prepare Portland cement clinkers,the temperature of liquid phase and C 3S formation are lower,and the sinterability of raw meal is improved.f-CaO conforms to the standard requirement of Portland cement clinkers with lime saturation degree(KH)lower than 0.92 sintered well under 1400℃were prepared。The size of C 3S is about 20μm,and the structure of clinkers is more compact.