Effect of Phosphogypsum on Release of Heavy Metals from Electrolytic Manganese Residue in Different pH

电解锰渣作为一种富含大量重金属的工业固体废弃物，其堆放对周边生态环境造成潜在的生态风险。为研究不同pH条件下磷石膏对电解锰渣中重金属释放的影响，本研究通过室内模拟的方法，研究pH为4、5、6、纯净水(CK)和8的五种不同pH条件下磷石膏的添加对电解锰渣中Mn、Cu、Cd、Pb和Tl释放的影响。结果表明，pH 4时，除Pb外，浸出液中Mn、Cu、Cd和Tl的浓度高于其它pH处理组；整体上，pH 5时，浸出液中Mn、Cu、Tl浓度最低，而CK条件下，浸出液中Cd浓度最低；电解锰渣中Pb的释放受到双重因素的调控，磷石膏添加比例的升高有助于Pb的稳定化。As a kind of industrial solid waste rich in heavy metals, electrolytic manganese residue poses potential ecological risks to the surrounding ecological environment. In order to study the effect of phosphogypsum on the release of heavy metals in electrolytic manganese slag under different pH conditions, this study studied the effect of phosphogypsum addition on the release of Mn, Cu, Cd, Pb and T1 in electrolytic manganese slag under five different pH conditions of pH 4, 5, 6, pure water (CK) and 8 by indoor simulation. The results showed that the concentrations of Mn, Cu, Cd and T1 in the leaching solution were higher than those in other pH groups except Pb at pH4. On the whole, the concentration of Mn, Cu and T1 in the leaching solution was the lowest at pH5, while the concentration of Cd in the leaching solution was the lowest at CK. The release of Pb from electrolytic manganese slag is regulated by two factors, and the increase of phosphogypsum addition ratio contributes to the stabilization of Pb.