Leaching behavior and solidification effect of main metals in red mud-based road construction materials
The pollution characteristics of red mud,such as high alkalinity,high fluoride and multi metal content,will affect its resource utilization.Ai-ming at major metals in red mud road application with potential environmental risks,this paper mainly studied the impact of the preparation process for red mud-based road materials on the environmental leaching behavior and solidification effect of major metal pollutants.The results showed that the total a-mount and leaching content of metals in different red mud-based road materials were influenced by the bauxite production site,alumina production process and the materials added during the preparation process.The preparation process of red mud-based road materials had a significant solidification effect on Al,As,V,Se and Mo,thus reducing their leaching content by 10.97％～75.77％,97.84％～99.90％,98.16％～100.00％,90.62％～99.34％and 61.60％～87.66％,respectively.However,the solidification effect on Na,Fe,K,Ba and Cr was not significant and instead increased their leaching content.Attention should be paid to the quality control during the material preparation process.In the actual road application process,the long-term risk assessment should focus on but not limited to the migration and transformation of Na,total Cr,Cr6+,V,Se,Mo and other environmental behaviors in red mud-based road materials.
Bayer red mudred mud-based road materialmetalsolidification effect
万方数据
维普
