García M A, Chimenos J M, Fernández A I, Miralles L, Segarra M, Espiell F
Department of Chemical Engineering and Metallurgy, University of Barcelona, Martí i Franqués, 108028 Barcelona, Spain.
Chemosphere. 2004 Aug;56(5):481-91. doi: 10.1016/j.chemosphere.2004.04.005.
Low-grade MgO may be an economically feasible alternative in the stabilization of heavy metals from heavily contaminated soils. The use of MgO is described acting as a buffering agent within the pH 9-11 range, minimizing heavy metals solubility and avoiding the redissolution that occurs when lime is used. The effectiveness of LG-MgO has been studied as stabilizer agent of heavily polluted soils mainly contaminated by the flue-dust of the pyrite roasting. The use of LG-MgO as a reactive medium ensures that significant rates of metal fixation, greater than 80%, are achieved. The heavy metals leachate from the stabilized soil samples show a concentration lower than the limit set to classify the waste as non-special residue. Regardless of the quantity of stabilizer employed (greater than 10%), LG-MgO provides an alkali reservoir that allows guaranteeing long-term stabilization without varying the pH conditions.
低品位氧化镁可能是从重度污染土壤中稳定重金属的一种经济可行的替代方法。氧化镁的用途被描述为在pH值9 - 11范围内充当缓冲剂，使重金属溶解度最小化，并避免使用石灰时出现的再溶解现象。低品位氧化镁（LG - MgO）作为主要受黄铁矿焙烧烟尘污染的重度污染土壤稳定剂的有效性已得到研究。使用LG - MgO作为反应介质可确保实现大于80%的显著金属固定率。稳定化土壤样品中的重金属渗滤液浓度低于将废物分类为非特殊残渣所设定的限值。无论使用的稳定剂数量多少（大于10%），LG - MgO都提供了一个碱库，可确保在不改变pH条件的情况下实现长期稳定化。
