含砷高铁废水处理研究现状

Research Progress of the Treatment of High Iron Arsenic Wastewater

含砷高铁废水为冶炼工业中硫酸化焙烧-水浸后产生的废水,其主要特点是酸性强,含有大量的Fe^(2+)、SO_4^(2-),同时含有少量的As^(3+)、Cu^(2+)、Zn^(2+)、Cd^(2+),系统介绍了处理含砷高铁废水的技术方法、工艺流程及最新研究进展。目前含砷重金属废水的处理方法有中和沉淀法、硫化物沉淀法、离子交换法、铁粉还原法及生物絮凝法等。论文详细比较了这些方法的工艺路线及存在的优缺点,并展望了利用高铁废水制备无机高分子絮凝剂、磁性纳米材料、铁系颜料等产品具有良好的工业应用前景。

High iron arsenic wastewater is produced by sulfated roasting-water leaching in the smelting industry.The wastewater is highly acidic and contains massive Fe2+and SO42-as well as a spot of As3+,Cu2+,Zn2+and Cd2+ions.This article systematically introduces the technical methods,process flow and the latest research progress of the treatment for the high iron arsenic wastewater.At present,the treatment methods mainly include neutralization precipitation,sulfide precipitation,ion exchange,iron powder reduction and biological flocculation.The process route as well as the advantages and disadvantages of these methods are compared in detail.Moreover,the industrial applications of the wastewater in the preparation of inorganic polymer flocculants,magnetic nano-materials,iron oxide pigments and other products are introduced.