摘要
利用水泥窑协同处置污水厂污泥,是一种经济、可行的资源化利用方式。重庆富皇水泥(集团)有限公司用未经干化的污水厂污泥,以合适的比例替代部分水泥生产原材料,用污泥泵直接喷入回转窑窑尾烟室内,利用水泥窑的高温煅烧成熟料。对比分析了掺加污泥前后水泥熟料的物理性能和矿物组成,探讨掺加污泥对其影响。结果表明,掺加污泥后水泥熟料的各项指标均满足国家标准,除稠度外,细度、凝结时间均无明显变化,28 d抗压强度和抗折强度有明显增加,安定性也有所增强。水泥熟料的主要矿物中,C3S含量呈极显著增加趋势,这是28 d强度明显增加的主要原因;C2S含量明显减少,而C3A和C4AF含量没有明显变化。可见适量掺加污泥对水泥熟料是有利的。
Abstract： Co-disposal of sewage sludge in cement kiln is an economic and feasible method of resource utilization. An appropriate ratio of sewage sludge without drying replaced cement as a raw material. The mixture was pumped into the smoke chamber at the end of the rotating kiln by the sludge pump and calcined into cement clinker using high temperature in the kiln. The physical properties and mineral composition of the cement clinkers produced with and without sludge were compared and analyzed to discuss the effect of adding sludge. The result showed that all the indexes of the cement clinker produced with sludge met the national standard. Except for consistency, there was no evident variation in particle fineness and setting time. The 28-d compressive strength and breaking strength were increased evidently, and the stability was improved. Among the main minerals of cement clinker, tricaleium silicate was increased dramatically. This was the primary cause of the increase in 28-d compressive strength and break-ing strength. Meanwhile, dicalcium silicate was decreased, and tricalcium aluminate and brownmillerite showed no evident variation. Adding an appropriate amount of sludge is beneficial to the cement clinker.
出处
《中国给水排水》
CAS
CSCD
北大核心
2012年第19期1-3,7,共4页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2009ZX07315-002-02)
关键词
污泥
生态水泥
水泥窑
物理性能
矿物组成
sewage sludge
eco-cement
cement kiln
physical property
mineral compo-sition
