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铬污染土壤对水泥熟料强度和铬浸出浓度的影响

Keywords: 铬污染土壤,强度,浸出浓度,固溶,包裹

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Abstract:

为探索水泥窑协同处置铬污染土壤(CCS)的可行性,用CCS部分替代硅质原料配制生料,于1400℃煅烧成熟料,通过化学分析、强度测试、浸提实验及XRD/SEM分析,研究了CCS对生料易烧性、熟料强度及六价铬/总铬(Cr(VI)/∑Cr)浸出浓度的影响。结果表明,CCS能改善熟料烧成,掺量从0到15%,熟料中f-CaO含量略有下降,硬化试体的3d、28d、90d强度略有提高。Cr(VI)/∑Cr浸出浓度随CCS掺量增加而增大,但随养护龄期延长而减小;当CCS掺量小于8%时,熟料3d至90d水化物的浸出液中,Cr(VI)浓度均低于0.05mg/L,符合Ⅱ类地表水环境质量标准限值。铬离子浸出毒性减小是由于铬在熟料矿物和水化产物中的固溶以及水化产物对它的包裹封固作用。研究表明,水泥窑协同处置CCS是一种可行的无害化处理和资源化利用途径。

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