摘要
以城市污水处理厂脱水污泥作为主要原料,添加粉煤灰和粘土烧制陶粒滤料,考察了烧制过程中各主要因素(干燥时间、预热温度、预热时间、焙烧温度和焙烧时间)对产品性能(比表面积、堆积密度和颗粒密度)的影响,最终结合正交实验确定了污泥作为主要原料烧制陶粒的最佳工艺条件.结果表明,污泥与辅料的最佳质量配比为:污泥:粉煤灰:粘土=2:3:1,烧制陶粒的最佳工艺条件为:干燥时间1h,预热温度300℃,预热时间20min,焙烧温度1100℃,焙烧时间8min,此时制得的陶粒比表面积为4.222m2/g,堆积密度为635kg/m3,颗粒密度为1146kg/m3,孔隙率为22.4%,盐酸可溶率为0.18%,破碎率为0.4%.
Sewage sludge was used as principal material to sinter lightweight keramzite aggregates. The optimized preparation conditions were selected. The impacts of main factors （dry time, preheating temperature, preheating time, sintering temperature, and sintering time） on characteristics of lightweight aggregate （specific surface area, bulk density, and granule density） were studied. The results show that the optimized mass ratio of sewage sludge to additives was that sewage sludge：fly ash：clay=2：3：1. The optimized preparation conditions were as follows： dry time 1 h, preheating temperature 300℃, preheating time 20 min, sintering temperature 1100℃, and the sintering time 8 min. Under these conditions, the characteristics of lightweight keramzite aggregates were obtained as follows： specific surface area 4.222 m^2/g, bulk density 635 kg/m^3, granule density 1146 kg/m^3, porosity 22.4%, weight loss in hydrochloric acid 0.18%, and abrasion loss 0.4%.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第5期972-977,共6页
The Chinese Journal of Process Engineering
基金
国家'十一五'科技支撑计划基金资助项目(编号:2006BAJ08B05-2)
山东省科技发展计划基金资助项目(编号:GG20006003)
山东大学科技发展计划基金资助项目(编号:061073)
关键词
城市生活污泥
陶粒
制备
sewage sludge
keramzite
preparation
