Effect of red mud on the mobility of heavy metals in mining-contaminated soils  

作　　者：YI Li HONG Yetang WANG Duojun ZHU Yongxuan 

机构地区：[1]Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China [2]The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [3]Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Journal Of Geochemistry》2010年第2期191-196,共6页中国地球化学学报

基　　金：supported by the basic research program from the Institute of Earthquake Science, China Earthquake Administration (0207690233);the Earthquake Science Foundation, China (C07002);the National Natural Science Foundation of China (40774036)

摘　　要：The mobility of Cu2+, Zn2+, Ni2+, and Cd2+ in soils treated with red mud was experimentally studied to explore the feasibility of remediation of smelter-contaminated soils. Red mud samples were collected with the Bayer process (BRM) and confederate process (CRM) in the Aluminous Plant of Guizhou Province. Two farmed soil samples were collected from the Niujiaotang mining area, Guizhou Province, Southwest China. One sample was weakly polluted by fly ash; and the other was polluted severely by waste water from the smelter. For evaluating the potential of remediation, the concentrations of free metal ions and the distributions of metals in the soil were determined. The concentrations of free metal ions were measured by using the Donnan Membrane Technique, and the contributions of soil sorbents to the heavy metals adsorptions were calculated with Equilibrium Calculation of Speciation and Transport (ECOSAT). BRM reduced the concentrations of free metal ions in two kinds of soils, while CRM only favored the decrease of the concentrations of free metal ions in seriously contaminated soils. The experimental data also showed a tendency that the concentrations of free metal ions decreased proportionally with the amount of added red mud, which resulted from the increasing adsorption of heavy metal ions in the form of metal ion hydroxides.The mobility of Cu^2＋, Zn^2＋, Ni^2＋, and Cd^2＋ in soils treated with red mud was experimentally studied to explore the feasibility of remediation of smelter-contaminated soils. Red mud samples were collected with the Bayer process （BRM） and confederate process （CRM） in the Aluminous Plant of Guizhou Province. Two fanned soil sam- ples were collected from the Niujiaotang mining area, Guizhou Province, Southwest China. One sample was weakly polluted by fly ash; and the other was polluted severely by waste water from the smelter. For evaluating the potential of remediation, the concentrations of free metal ions and the distributions of metals in the soil were determined. The concentrations of free metal ions were measured by using the Donnan Membrane Technique, and the contributions of soil sorbents to the heavy metals adsorptions were calculated with Equilibrium Calculation of Speciation and Trans- port （ECOSAT）. BRM reduced the concentrations of free metal ions in two kinds of soils, while CRM only favored the decrease of the concentrations of free metal ions in seriously contaminated soils. The experimental data also showed a tendency that the concentrations of free metal ions decreased proportionally with the amount of added red mud, which resulted from the increasing adsorption of heavy metal ions in the form of metal ion hydroxides.

关 键 词：污染土壤修复 重金属离子 赤泥处理 流动 游离金属离子 浓度分布 采矿 浓度测定 

分 类 号：X53[环境科学与工程—环境工程] X703