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污泥与底泥烧结陶粒骨料的中试研究

Keywords: 污泥,底泥,中试,轻骨料

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Abstract:

建立了中试研究生产线,工艺流程包括干燥、粉磨、混合上料、成型、烧结和烟气处理等,在中试生产线上,对污泥(包括工业污泥(ISS)和生活污泥(DSS))与底泥烧结制备陶粒骨料的物料配比、烧结温度、添加剂等相关技术参数进行了系统研究。研究发现,ISS中CaO和磷的化合物含量较高,导致骨料的膨胀性能不佳,添加一定量的生活污水污泥(DSS)可改善骨料的膨胀性能。中试研究确定600~800级的陶粒骨料烧结的适宜工艺条件为:配比SS:DSS:RS=1:4:5~1:5:4或DSS:RS=3:7~5:5,烧结温度1140℃,烧结时间28min环境安全性研究表明,在陶粒烧结过程中大部分重金属在烧结过程中被固定在陶粒中,重金属浸出率非常低,在使用过程中不会对环境产生危害。

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