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

Abstract

Abstract: 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.

Key words: copper tailing, raw meal, Portland cement clinker, sintering temperature, clinker modulus, sinterability

CLC Number:

TQ172

YAN Jun, NIE Song, LIU Songbai, QIU Tingsheng. Preparation of Portland Cement Clinkers by Utilizing Copper Tailings as Siliceous Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1273-1279.

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