给水厂残泥免烧陶粒的制备与性能表征

Preparation and Characterization of Unburned Ceramsite from Water Treatment Residuals

本研究以给水厂残泥为主要原料,采用免烧法制成了给水厂残泥免烧陶粒(UCWTR),通过正交试验,确定了UCWTR制备的最佳配比。结果表明:原料的最佳质量配比为给水厂残泥60%、水泥15%、添加剂20%、激发剂5%,另外每100 g原料用水30～35 mL,水玻璃2 g。最佳质量配比条件下,WTR免烧陶粒在水中解体率为3.66%,强度较好,吸水率为31.76%,比表面积为17.837 m2/g,总孔容0.058 25 cm3/g,孔径3.920nm,破损率与磨损率之和为0.35%,含泥量为0.5%,堆积密度为900～950 kg/m3,表观密度1 000～1 200 kg/m3,满足规范要求。本研究制得的UCWTR性能良好,可作为一种陶粒滤料材料应用于水处理中。

The UCWTR was prepared using water treatment residuals with some auxiliary materials. The orthogonal test method is used to determine the various raw materials by using the parameters of strength, water absorption and specific surface area as indicators. The results show that the optimum amount of raw materials is WTR 60%, cement 15%, additive 20%, 5% activator, 2% sodium silicate, and 30~35 mL water. At this time, the disintegration rate of WTR unburned ceramsite in water was 3.66%, the water absorption rate was 31.76%, the specific surface area was 17.837 m^2 /g, the total pore volume was 0.058 25 cm^3 /g, the pore diameter was 3.920 nm, and the breakage rate was 0.35%, The mud content is 0.5%. the apparent density is 1 000-1 200 kg/m^3. The UCWTR prepared in this experiment has good performance and can be used as a ceramsite filter material in water treatment.