利用铜尾矿作硅质原料制备硅酸盐水泥熟料的研究

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(1 350 ℃、1 400 ℃和1 450 ℃)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C₃S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0.92,1 400 ℃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,C₃S的尺寸约为20 μm,熟料的结构更加致密。

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

Portland cement clinkers with different clinker modulus were prepared by utilizing copper tailings as siliceous material at different calcination temperatures (1 350 ℃, 1 400 ℃ and 1 450 ℃). 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 C₃S 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 1 400 ℃ were prepared。The size of C₃S is about 20 μm, and the structure of clinkers is more compact.