The leaching mechanism of chromium ion from high chromium slag in cement-based materials
GUO Xuewu
JI Luxin
CHENG Wei
SHAO Nianping
LI Erwang
BA Mingfang
Abstract：To explore the leaching mechanism of chromium ions in municipal solid waste incineration fly ash sintered slag(PS)and its ground powder(GP)in cement-based materials,long-term leaching experiments for total chromium and hexavalent chromium in cement-based materials with different contents of PS and GP were performed in accordance with the NEN7375 stan-dard.The results showed that the release of total chromium and hexavalent chromium in the cement-based materials with added PS and GP exhibited a trend of rapid release followed by slower release.The release equilibrium times for total chromium and hexavalent chromium were different,but both reached equilibrium by the 64th day.It can be understood that the total chromium leaching in both the single and complex mixed Portland cement-based materials was diffusion-controlled,whereas hexavalent chromium leaching was controlled by diffusion and exhaustion.
Keywords：incineration fly ash from household wastehigh-temperature sinteringlong-term leachingchromium ions
Publication Date：2024-10-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 31-36 )