桂西氧化铝工业赤泥中重金属元素地球化学特征及其污染风险评价

Geochemical Characteristics and Pollution Risks Assessment of Heavy Metal Elements in Red Mud of Alumina Industry in Western Guangxi

本文以桂西三大典型铝业公司的6个赤泥库为研究对象,在对赤泥中重金属元素地球化学特征研究基础上,参照单因子指数法、内梅罗综合指数法和潜在生态危害指数法模型开展了潜在污染风险评价。结果表明,氧化铝工业生产赤泥中的As、Cr、Cd、Pb等元素相对于地壳克拉克值、广西土壤背景值和原矿石均具有明显的富集作用,而Cd、Cr、As、Ni具有较高的潜在污染风险。因此,建议对赤泥进行综合利用或作为改良剂修复污染土壤时,有必要预先开展可能带来的二次污染评估。

In this paper,we select six red mud ponds of three major typical aluminum companies in western Guangxi as research objective,based on research of geochemical characteristics of heavy metal elements in red mud,and carry out evaluation of potential pollution risks by utilizing single factor index method,Nemerow index and potential ecological risk index methods.The result shows that elements such as As,Cr,Cd and Pb and others in the red mud produced by Alumina industry have an obvious enrichment effect on crust abundance,soil background value of Guangxi and raw core,while Cd,Cr,As and Ni have greater potential pollution risks.Therefore,it is suggested to comprehensively utilize the red mud and evaluate the secondary pollution in advance when used as the modifier to restore the polluted soil.