以粉煤灰、赤泥低温烧制贝利特-硫铝酸盐水泥

Prepared Belite Sulfoaluminate Cement Using Fly Ash and Bayer Red Mud on Low Temperature

以粉煤灰、拜耳法赤泥为原料低温烧制贝利特-硫铝酸盐水泥,研究不同烧结温度、保温时间对水泥工作性能、力学性能的影响,借助光学显微镜和XRD分析熟料的矿物形貌、颗粒大小及各矿物相对含量。结果表明:水泥的最佳烧结温度为1300℃,最佳保温时间为60 min。烧结温度过低或保温时间过短时,熟料矿物形成不完全,贝利特相晶粒尺寸较小,气孔率较高;烧结温度过高或保温时间过长时,贝利特相的水化活性因晶粒尺寸增大而降低,少量硫铝酸钙分解,以上均不利于水泥工作性能和力学性能的发挥。

Using fly ash and Bayer red mud as raw material to prepare belite sulfoaluminate cement on low temperature, studied the effect of sintering temperature and sintering time on work performance and mechanical properties, and analyzed the clinker mineral morphology, particle size and relative content of various minerals by optical microscope and XRD. The results show that the best sintering temperature of clinker is 1300 ℃, and the optimal sintering time is 60 min. When sintering temperature is too low or sintering time is too short, the formation of clinker mineral is incomplete, grain size is smaller, and porosity is higher. When sintering temperature is too high or sintering time is too long, the hydration activity reduce as the increase of grain size, and part of calcium sulphoaluminate decomposes. All of the above are adversely to the work performance and mechanical properties of clinker.