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晶种和钾离子促进生物成因黄铁矾形成的作用机制

DOI: 10.7685/j.issn.1000-2030.2013.02.016, PP. 97-102

Keywords: 晶种,,黄铁矾,酸性矿山废水,嗜酸性氧化亚铁硫杆菌

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Abstract:

采用摇瓶试验,研究了晶种(先前合成的黄铁矾)和钾离子在生物成因黄铁矾合成中的作用及其影响机制。结果表明2种材料均能明显促进Fe3+水解形成黄铁矾沉淀。在起始Fe2+浓度为160mmol?L-1,晶种和K+最大添加量分别为10g和80mmol?L-1时,经过72h反应后,溶液中的总铁(TFe)分别比对照多沉淀了23和33mmol?L-1。K+在黄铁矾形成中起阳离子诱导作用,晶种起晶核刺激作用。K+的促进作用主要发生在24~48h,但在低Fe3+浓度下作用有限;而晶种可以减少低Fe3+浓度对黄铁矾形成的不利影响。结论晶种和K+共同作用不仅能够明显促进Fe3+的水解沉淀,而且绝大部分反应发生在0~24h,极大地缩短了反应时间。

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