QI Fei 1, ZHANG Changsen 2, CHEN Jinghua 2
(1. Department of Housing and Urban-Rural Construction of Yandu District, Yancheng 224001, Jiangsu, China; 2. School of
Materials Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China)
Abstract: Porous ceramsite was prepared with sewage sludge and coal gangue. The influence of different mix proportion and sintering temperature on volume density, water absorption and apparent porosity of porous ceramsite was studied. The results show that the ratio of sludge should be less than 50% in the mixture. When the dosage of city sludge ranges within 20 ~ 50%, the sintering temperature is 1120 ℃.and the holding time is 1 hour, volume density of porous ceramsite is 1030 ~ 1200 kg/m3, apparent the porosity is 26% ~ 50%, the water absorption is 23% ~ 35%. Harmful heavy metals in sewage sludge are effectively cured in ceramic and will not cause secondary pollution to the environment.
Key words: sewage sludge; coal gangue; porous ceramsite; property