重金属硫化矿高温提取过程产生大量烟气洗涤酸性含砷废水；此类废水具有污染源众多、持续排放、游离酸和砷浓度高、成分复杂的特点；以石灰中和-硫化沉砷/铁盐处理工艺为代表的方法废渣排放量大、处理成本高、处理后难以有效达标。 申请人提出新型EDI与超声电化学间接氧化相结合的砷氧化-砷高效萃取-重金属回收工艺的全新处理工艺；针对离子高效分离、As(III)直接/间接氧化为As(V)、EDI与超声电氧化耦合等关键问题，从反应热力学-氧化动力学和反应工程学的角度出发，研究As(III)直接/间接氧化为As(V)的机理、EDI与超声电氧化耦合机制、阴阳离子高效分离等问题，为这一新型环境友好工艺的实用化提供相关的基础数据和反应动力学模型。本项目的研究成果对于采用这种新型工艺有效解决重有色金属冶炼行业广泛存在的烟气洗涤酸性含砷废水的污染具有极其重要的意义。

A large number of acid waste water containing arsenic can be produced after fiue gas cleaning in high temperature extraction process of heavy metal sulfide ore. Such wastewater have such characteristics as large pollution sources, continuous emissions , high concentrations of acid free and arsenic and complex composition. The method represented by treatment with lime neutralization-arsenic sulfide/ ferrous salt has such disavantages as waste emissions, high processing costs, effective after treatment compliance. So the applicant proposes a new EDI processing which is efficient new process for extraction of heavy metal recovery process combined with ultrasonic indirect electrochemical oxidation of arsenic in arsenic oxide. The problems of high separation performance issues such as As (III) oxide directly/indirectly to As (v), EDI and ultrasonic electro oxidation coupling mechanism, the mechanism of anionic-cationic will be studied aiming at some key issues of ion efficient isolation, As (III) oxide directly/indirectly to As (v), EDI and ultrasonic electro oxidation coupling from a thermodynamic reaction-oxidation kinetics and reaction engineering point of view. The study would provide the underlying data and associated reaction kinetics model for the practicality of new environmental friendly technology.The research results of this project has profound significance to adopt this new technology with an objective to avoid the products of flue gas scrubbing acidic waste water containing arsenic pollution in heavy non-ferrous metal smelting industry.