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共存物质对钢渣除磷的影响

Keywords: 钢渣,磷酸盐,形态,pH,共存物质

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Abstract:

研究了pH、共存离子(Cl-、NO3-、SO42-、F-、HCO3-)和腐植酸对钢渣吸附除磷的影响。结合吸附饱和钢渣上的磷形态分析了产生影响的原因,采用SEM-EDS(扫描电子显微镜-X射线能谱分析)对吸附磷酸盐前后钢渣表面的微观形态特征进行观察。结果表明:钢渣对磷酸盐具有很好的去除效果,吸附饱和钢渣中的磷主要以Ca—P形式存在。钢渣吸附磷酸盐最适初始pH为3~5,高pH抑制Ca—P的生成,对吸附不利。NH4+的存在提高了Ca—P含量,从而促进钢渣对磷酸盐的吸附。共存阴离子Cl-、NO3-、SO42-对钢渣吸附磷酸盐没有影响,但是F-和HCO3-明显抑制Ca—P的生成,从而减少了钢渣对磷酸盐的吸附。腐植酸的存在显著抑制了Ca—P和O—P的生成,使钢渣对磷酸盐的吸附量大大减小。

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