掺合料对协同处置水泥混凝土重金属浸出特性的影响
Influence of Admixtures on the Leaching Characteristics of Heavy Metals in Cement Concrete
宋羿昊1
作者信息
- 1. 安徽工业大学建筑工程学院,马鞍山 243032
- 折叠
摘要
将水泥窑协同处置固废技术用于水泥生产是一种环保和资源化利用的有效途径.但固废中的部分重金属会通过熟料进入到水泥中,在水泥产品的使用过程中存在释放或浸出的潜在风险.为了降低碳化作用下水泥混凝土中重金属浸出量,通过外掺矿物掺合料研究掺合料对重金属浸出性能的影响.结果表明:粉煤灰和矿渣作为矿物掺合料能够优化混凝土的微观结构,在混凝土内部形成了一种含Cr和Ca的无定形复合氢氧化物沉淀,大幅降低Cr和Cr6+的浸出量,其浸出量小于GB 3838-2002 的V类地表水限值.
Abstract
It is an effective way of environmental protection and resource utilization to apply the technology of cooperative disposal of solid waste in cement kiln to cement production.However,some heavy metals in solid waste will enter the cement through clinker,and there is a potential risk of release or leaching during the use of cement products.In order to reduce the amount of heavy metal leaching in cement concrete under carbonization,the influence of mineral admixtures on the leaching performance of heavy metals was studied.The results show that fly ash and slag as mineral admixtures can optimize the microstructure of concrete,form an amorphous composite hydroxide precipitation containing Cr and Ca in the concrete,and greatly reduce the leaching amount of Cr and Cr6+,which is less than the Class V surface water limit of GB 3838-2002.
关键词
协同处置水泥混凝土/加速碳化/离子浸出/六价铬Key words
high content of heavy metal cement concrete/accelerate carbonization/ion leaching/hexavalent chromium引用本文复制引用
出版年
2025
NETL
NSTL
万方数据