钢渣微粉对重金属污染土壤的改良效果研究
Study on the Improvement Effect of Steel Slag Micro Powder on Heavy Metal Polluted Soil
吴丽梅 1马俊亮 1唐宁 1潘文浩1
作者信息
- 1. 沈阳建筑大学材料科学与工程学院,辽宁沈阳 110168
- 折叠
摘要
研究了钢渣微粉对重金属(Cu2+和Cr6+)污染土壤的修复效果,讨论了钢渣微粉掺量、粒径等的影响规律和机理,发现钢渣微粉对重金属污染土壤具有良好的修复效果,随着钢渣粒径的减小、比表面积的增大和土壤液固比的增大,土壤中Cu2+和Cr6+的浸出浓度减小.同时为揭示钢渣微粉对Cu2+和Cr6+的固化机理,利用XRD、FTIR和SEM对修复土壤样品进行分析测试,发现钢渣微粉对Cu2+和Cr6+的固化主要是通过钢渣的孔隙对其进行吸附,并通过钢渣水化产生的OH-与重金属离子结合形成沉淀来实现的,同时钢渣水化形成的C-S-H对重金属也有一定的包裹效果.
Abstract
The remediation effect of steel slag fine powder on soil contaminated by heavy metals(Cu2+and Cr6+)was investigated in this study,with a discussion on the influence of steel slag fine powder content and particle size.It was observed that steel slag fine powder effectively reduced the leaching concentrations of Cu2+and Cr6+in the contaminated soil.Furthermore,XRD,FTIR,and SEM analyses were conducted to elucidate the mechanism of Cu2+and Cr6+immobilization by steel slag micro-powder.The results indicated that solidification of Cu2+and Cr6+by steel slag micro-powder primarily occurred through pore adsorption as well as precipitation formation via combination with OH-produced during hydration of steel slag.Additionally,C-S-H formed during hydration also contributed to encapsulation of heavy metals.
关键词
钢渣/土壤修复/重金属/固化机理Key words
steel slag/soil remediation/heavy metals/curing mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据