电氧化法去除电解锰渣滤液中NH_4^+-N试验研究  

Removal of Ammonia-nitrogen From Leachate of Electrolytic Manganese Residue by Electrooxidation Technology

作　　者：陈红亮[1] 龙黔[1] 舒建成[2] 刘仁龙[2] 

机构地区：[1]安顺学院化学化工学院,贵州安顺561000 [2]重庆大学化学化工学院,重庆400044

出　　处：《湿法冶金》2017年第3期242-246,共5页Hydrometallurgy of China

基　　金：贵州省教育厅科技拔尖人才支持项目(黔教合KY字[2016]094);安顺学院博士基金资助项目(asubsjj201604)

摘　　要：研究了采用电氧化法从电解锰渣滤液中去除NH_4^+-N的影响因素、机制和动力学。结果表明:采用DSA阳极板和石墨阴极板,NH_4^+-N去除效果较好;提高Cl-质量浓度、初始pH、电流密度均有助于提高NH_4^+-N去除率;NH_4^+-N初始质量浓度越低,去除率越高;在Cl-质量浓度434mg/L、滤液pH=9、电流密度26mA/cm2条件下,NH_4^+-N质量浓度为59、120mg/L的滤液分别电解60、240min时,NH_4^+-N质量浓度均降至6mg/L;滤液中Mn2+易在阳极形成MnO2沉淀,不利于NH_4^+-N的去除;有Cl-存在条件下,NH_4^+-N的去除主要是Cl-在DSA阳极板作用下产生的HClO和ClO-将NH_4^+-N氧化为N2的结果;不同初始NH_4^+-N初始质量浓度下,电氧化去除反应符合表观一级动力学模型。Influential factors, mechanism and reaction kinetics of removal leachate of electrolytic manganese residue were studied. The results show of NH4＋-N is good using DSA as anode and graphite as cathode. Increasing pH and current density are in favour of removal of NH＋-N. The lower of ammonia-nitrogen from that the removal efficiency of C1- concentration,initial NH＋-N concentration, the removal of NH＋-N is higher. NH＋-N concentrations can be reduced to 6 mg/L at 60 min and 240 min, respectively, under the conditions of Cl- concentration of 434 mg/L,initial pH of 9,current density of 26 mA/cm2. Mn2＋ is easily converted into MnO2 at the anode which is unfavorable for NH＋-N removal. Removal reaction mechanism of NH＋-N in the presence of Cl- is that NH＋-N is oxidized by HClO and ClO- which produces on the anode. Removal reaction of NH＋-N accords with the apparent first order kinetic model.

关 键 词：电解锰渣 渗滤液 NH+4-N 电氧化 去除 

分 类 号：X757[环境科学与工程—环境工程]