Study on heavy metal leaching behavior and environmental impact of gangue-prepared autoclaved aerated concrete
DUAN Saihong
SHU Chunxue
MA Chaozheng
ZHANG Ye
Abstract：For the coal gangue and its prepared autoclaved aerated concrete blocks in Lueliang area of Shanxi Province,the total amount and leaching toxicity of seven typical heavy metals,As,Cr,Mn,Ni,Pb,Se and Zn,were analyzed,and the heavy metal fugue morphology was studied by using the improved Bureau of Reference Materials of the European Communities step-by-step ex-traction method,and the Risk Assessment Coding method was applied for comparative analyses of the gangue A AC products.The environmental safety of gangue AAC products was comparatively analyzed using the RAC method.The long-term cumulative release behavior of heavy metals in gangue AAC was investigated by combining with the water tank leaching test.The results show that the leaching amount of Mn and Ni in the original powder of gangue exceeds the standard limit value of Ⅳ in surface water,and the leaching amount is reduced to 0.58 and 0.91 μg/L after making AAC blocks,and the curing effect is obvious.The leaching amount of heavy metals from gangue AAC in the sink leaching test is far below the DSQ limit value stipulated by the Dutch De-cree on Soil Quality of Building Materials,and it can be safely applied in construction.
Keywords：coal gangueAACheavy metalsleaching toxicityfugue morphologyenvironmental risk
Publication Date：2024-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 76-80 )