Stabilization effects of different materials on arsenic-containing slag
YU Bing-bing1,2,3, YAN Xiang-hua2,3, WANG Xing-run2,3, LI Lei2,3, ZHANG Yu-xiu1
1. School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
2. National Engineering Laboratory of Safety Remediation Technology for Polluted Sites, Beijing 100000, China;
3. State Key Laboratory for Environmental Benchmarks and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Ten kinds of typical materials including sulfides, calcium-based and iron-aluminum-based materials (Fe0, ferric salt, Fe2O3/Al2O3) were used to stabilize arsenic-containing slag. Five single chemical extraction methods simulating different exposure conditions were used to screen out materials with better stabilization effect. The mechanism underlying arsenic stabilization by typical materials was revealed by the analysis of continuous chemical extraction and microstructure characterization. The results demonstrated that Na2S·9H2O showed the best stabilization effect under natural condition. While, Fe0 exhibited the strongest arsenic stabilization ability followed by FeSO4·7H2O under other conditions. Fe0 is suitable for arsenic stabilization under organic weak acid and strong acid rain conditions. FeSO4·7H2O was effective under all conditions, however its effect varied greatly. It showed the best effect for arsenic stabilization under weak organic acid condition, and TCLP-As leaching was reduced to 1.50μg/L with arsenic stabilization rate of 99.98%. FeSO4·7H2O mainly reduced the extractable weak acid state, and converted the non-specific/specific adsorption state, amorphous and weak crystalline iron-aluminium or iron-manganese state into crystalline iron-aluminium or iron-manganese state and residue state. A small amount of insoluble iron and arsenic minerals (FeAsO4·2H2O and FeAsS) were formed after treatment.
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YU Bing-bing, YAN Xiang-hua, WANG Xing-run, LI Lei, ZHANG Yu-xiu. Stabilization effects of different materials on arsenic-containing slag. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3887-3896.
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