电炉精炼渣中重金属在不同溶液体系的浸出行为

Leaching Behaviors of Heavy Metals from Electric Furnace Refining Slag in Different Solutions

采用全溶实验、短期与长期浸出实验,对电炉精炼渣中重金属元素的浸出行为进行研究,并通过SEM与XRD分析其机理.结果表明,电炉精炼渣中Ba元素短期浸出浓度最高值为52.10 mg/L,超出国家污水重金属排放标准;Ni元素短期浸出浓度最高值为0.025 mg/L,V元素长期浸出浓度最高值为0.176 mg/L,超出生活饮用水卫生标准.重金属元素的浸出主要是由于钢渣中Ca2Si O4·H2O(C-S-H)等结构的破坏.

The leaching behaviors of heavy metals in electric furnace refining slag were studied by total dissolving, short-term and long-term leaching experiments, and the leaching mechanism was analyzed by SEM and XRD. The results show that in the slag, the concentration of Ba from short-term leaching is higher than the discharge standard of wastewater containing heavy metal, and the concentrations of Ni from short-term leaching and V from long-term leaching are higher than the hygiene standard of domestic and drinking water. Leaching of heavy metals is mainly due to the structural damage of Ca2SiO4.H2O （C-S-H） in the slag.