采用三维电吸附体系处理氰化废水的对比研究  

Comparative study on treatment of cyanide wastewater by three-dimensional electrosorption system

作　　者：尹宁 宋永辉[1] 雷思明[1] 周军[1] YIN Ning;SONG Yong-hui;LEI Si-ming;ZHOU Jun(Key Laboratory of Gold and Resources of Shaanxi Province,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi Province,China)

机构地区：[1]西安建筑科技大学陕西省黄金与资源重点实验室

出　　处：《化学工程》2019年第9期1-6,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51774227);陕西省自然科学基金重大基础研究项目(2017ZDJC-33);陕西省自然科学基金重点项目(2018JZ5011);陕西省自然科学基金陕煤联合基金资助项目(2019JLM-44)

摘　　要：采用三维电吸附体系处理氰化废水,主要对比分析了分别以不锈钢网(M)、活性炭填充不锈钢网(CM)和煤基电极(CB)为阴阳极时废水中氰化物与重金属离子去除率的变化。利用SEM-EDS,XRD对电极形貌及其负载物、沉淀物的组成进行分析表征,进一步探讨了三维电吸附过程的反应机理。研究表明:2V电压时,三维电极体系的处理效果优于二维体系;以CM为主电极时的处理效果明显优于M与CB,此时废水中CNT,Cu,Zn,CN-,SCN-的去除率均可达70%以上。废水中CN-,SCN-及金属氰络合离子的去除是煤基阳极与活性炭粒子电极吸附与电吸附共同作用的结果,同时,阳极表面OH-氧化分解导致H+浓度局部增大,使得电场作用下定向迁移至阳极附近的CN-,SCN-及金属氰络合离子之间发生的沉淀反应,也是废水中氰化物与重金属离子浓度减小的主要原因之一。XRD分析表明,沉淀物主要由Zn2Fe(CN)6,CuSCN,CuCN及Zn(OH)2等组成。The three-dimensional electrosorption system was used to treat the cyanide wastewater. The change of removal rate of cyanide and heavy metal ions in wastewater was compared and analyzed, treatment with stainless steel mesh (M), activated carbon filled stainless steel mesh (CM) and coal-based electrode (CB) as cathode and anode.The morphology of the coal-based electrode and the composition of the supported and precipitated materials were analyzed through SEM-EDS and XRD. The reaction mechanism of the three-dimensional electrosorption process was discussed further. The results show that the 3D electrode system is better than the 2D system when the voltage is 2 V, and the treatment effect is better than the M and CB electrodes when the CM is the main electrode. At this time, the removal rate of CN T , Cu, Zn, CN -, SCN - in the cyanide wastewater can reach more than 70%.The removal of CN -, SCN - and metal cyanide complex ions in wastewater is the result of the combined action of adsorption and electroadsorption of coal-based anode and activated carbon particle electrode. Meanwhile, OH - oxidation decomposition on the surface of the anode results in a local increase of H + concentration, which leads to a precipitation reaction between CN -, SCN - and metal cyanide complexes which migrate to the vicinity of the anode under electric field. It is also one of the main reasons that the concentration of cyanide and heavy metal ions in wastewater decreases. XRD shows that the precipitate consists mainly of Zn 2 Fe(CN) 6 , CuSCN, CuCN and Zn(OH) 2 .

关 键 词：氰化废水 电吸附 三维体系 去除率 

分 类 号：TF831[冶金工程—有色金属冶金]