摘要
采用连续水槽浸出试验研究了钢渣在胶砂中重金属的长期浸出规律,并通过浸出动力学模型拟合预测了胶砂30 a重金属累积浸出量。结果表明:钢渣中含有As、Cr、Cu、Mn、Ni、Pb和Zn等重金属,制备成胶砂后Cr、Cu、Ni和Zn浸出量偏高。随着浸出时间的增加,溶液中重金属离子累积浸出量先快速增加后减缓;胶砂预先养护龄期越长,重金属累积浸出量越低,对重金属Zn的固化作用越明显。水泥胶砂中Cr和Ni、Cu和Zn的浸出规律分别符合Elovich方程和双常数速率方程,掺钢渣胶砂中Cu的浸出规律满足双常数速率方程,而Cr、Ni和Zn的浸出规律满足二级动力学方程。通过动力学方程计算,预测掺钢渣胶砂与纯水泥胶砂中Cr、Cu、Ni和Zn的30 a累积浸出量相比分别降低了49.52%、24.02%、47.20%和89.79%。
The long-term leaching rule of heavy metals from steel slag in the wortar was studied by continuous flume leaching test,and the cumulative leaching amount of heavy metals in 30 years was predicted by fitting the leaching kinetic model.The results showed that the steel slag contained heavy metals such as As,Cr,Cu,Mn,Ni,Pb and Zn,and the leaching amount of Cr,Cu,Ni and Zn was higher after the preparation of mortar.With the increase of leaching time,the cumulative leaching amount of heavy metal ions in the solution increased first and then slowed down;the longer the pre-curing age of the mortar was,the lower the cumulative leaching amount of heavy metals was,and the more obvious the solidification effect on Zn was.The leaching law of Cr and Ni,Cu and Zn in cement mortar conformed to the Elovich equation and double constant rate equation,respectively the leaching law of Cu in steel slag mortar conformed to the double constant rate equation,and the leaching law of Cr,Ni and Zn conformed to the second order kinetic equation.According to the calculation of the kinetic equation,it was predicted that the cumulative leaching amount of Cr,Cu,Ni and Zn in steel slag mortar and pure cement mortar in 30 years was reduced by 49.52%,24.02%,47.20%and 89.79%,respectively.
作者
李沙
王肇嘉
王明威
郑永超
战佳宇
LI Sha;WANG Zhaojia;WANG Mingwei;ZHENG Yongchao;ZHAN Jiayu(State Key Laboratory of Solid Waste Reuse for Buiding Materials,Beijing Building Materials Academy of Sciences Research,Beijing 100041,China;State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第3期136-142,共7页
Environmental Engineering
基金
河北省科技重大专项(21283804Z)
国家重点研发计划项目(2018YFC1903602)。
关键词
钢渣
水泥基
胶凝材料
重金属
长期浸出
steel slag
cement-based
binding material
heavy metal
long-term leaching
