磁场效应对含砷工业废水萃取的影响

Magnetic Field Effect on As Extraction in Industrial Wastewater

通过萃取时间、温度、pH值的变化来考察含砷工业废水磁化前后,磁场效应对萃取砷的影响·试验直接选用双二-乙基己基磷酸作为萃取剂,并加入少量的磷酸三丁脂和磺化煤油在硫酸体系中萃取砷·含砷工业废水经磁化预处理后,可以提高砷的萃取率,并能有效地改善砷的萃取行为,同时也改变了废水中其他杂质的萃取分配比·含砷工业废水通过萃取富集后,可以用电解沉积或水合肼还原出单质砷·经萃取净化后的含砷废水可达到国家排放标准·此外,该工艺技术可以为其他含有毒、有害工业废水的净化处理提供新的研究领域·

The effect of magnetic field on extracting As in industrial wastewater was investigated experimentally through the change in exacting time/temperature and pH value, as well as whether the wastewater is magnetized or not. The (C_2H_5C_6H_(13))_2PO_4 was directly used as extractant with small amount of (C_4H_9)_3PO_4 and sulphurized kerosene added to it so as to extract As through vitrolization. After premagnetizing the As-containing wastewater, As extraction rate increases with extraction behavior effectively improved. At the same time, the distribution ratio of extracting other impurities in the wastewater is also changed. After extraction and enrichment, pure As in the wastewater could be deoxidized by electrolytic sediment or hydrated NH_2NH_2. The wastewater after As extraction and purification can be regarded as up to the state effluent standard. The As extraction process can also be applied to other industrial wastewater treatment if containing harmful/toxic impurities.