钢渣基固化药剂对重金属土壤修复机理的研究

摘要

With steel slag powder and phosphate making steel slag based solidiifcation agent, research the effect of steel slag based solidiifcation agent pore structure and consumption on solidiifcation remediation of heavy metal contaminated soil. Analyze pore structure and mineral composition of steel slag based solidiifcation agent, and microstructure of contaminated soil-steel slag based solidiifcation agent mixture by surface area and pore size analyzer, X-ray diffraction and scanning electron microscopy. The results showed that steel slag based solidiifcation agent pore structure are formed by moderate amount of phosphate treatment. Through ion exchange and encapsulated solidiifcation, steel slag based solidiifcation agent achieve the object of solidiifcation remediation of heavy metal contaminated soil. Steel slag based solidiifcation agent has good pore structure, when steel slag powder dosage is 80 g and phosphate dosage is 3.2 mL. Heavy metal contaminated soil has good effect of solidiifcation remediation when steel slag based solidiifcation agent is 25%.%以钢渣微粉与磷酸制备钢渣基固化药剂，研究钢渣基固化药剂孔结构与用量对重金属污染土壤固化修复效果的影响。采用比表面积及孔径测定仪、X射线衍射仪和环境扫描电镜对钢渣基固化药剂的孔结构与矿物组成，以及污染土壤-钢渣基固化药剂混合物的微观形貌进行分析。结果表明，适量磷酸处理有利于钢渣基固化药剂中多孔结构的形成；钢渣基固化药剂通过离子交换和包裹固化达到对重金属污染土壤固化修复的目的；当钢渣微粉用量为80 g，磷酸用量为3.2 mL时，钢渣基固化药剂具有较好的孔结构；钢渣基固化药剂用量为25%对重金属污染土壤具有良好的固化修复效果。