电解氧化法处理金矿废水  

Treatment of gold mine wastewater by electrolytic oxidation

作　　者：曾鑫辉 宋永辉[1,2] 李一凡 周民 刘刚 ZENG Xin-hui;SONG Yong-hui;LI Yi-fan;ZHOU Min;LIU Gang(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,Shaanxi Province,China;Shaanxi Key Laboratory of Gold and Resources,Xi′an 710055,Shaanxi Province,China;Tongguan Taizhou Smelting Co.,Ltd.,Weinan 714300,Shaanxi Province,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西省黄金与资源重点实验室,陕西西安710055 [3]潼关县太洲冶炼有限责任公司,陕西渭南714300

出　　处：《化学工程》2022年第2期9-14,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联合资助项目(2019JLM-44)。

摘　　要：采用电解氧化法处理金矿废水中的氰化物与化学需氧量(COD),考查了外加电压、NaCl添加量、溶液pH值、电解时间及极板间距等因素对氰化物和COD去除率的影响,并对电化学氧化过程及污染物氧化机理进行分析。在电压为6 V、pH值为9、电解时间为3 h、极板间距为1.5 cm、NaCl添加量为10 g/L的条件下,总氰(CN_(T))、COD和铜氰络合物的去除率最高可达到97.2%,96%和97.7%。电解氧化过程中氰化物和有机物的去除主要归因于溶液中Cl^(-)生成的ClO^(-)对其间接氧化的结果。Cl^(-)在阳极表面被氧化生成Cl_(2)和ClO^(-),对溶液中的污染物进行氧化降解,铜氰络合离子在阳极被氧化释放出来的铜离子定向迁移至阴极还原生成Cu金属单质沉积在阴极板上。Electrolytic oxidation method was used to treat the cyanide and COD in the gold ore wastewater.The influence of the voltage,NaCl content,pH value of the solution,electrolysis time and electrode spacing on the removal rate of cyanide and COD were examined.The electrochemistry oxidation process and oxidation mechanism of pollutant were analyzed.When the voltage was 6 V,the pH value was 9,the electrolysis time was 3 h,the electrode spacing was 1.5 cm,and the NaCl content was 10 g/L,the removal rate of CN_(T),COD and copper cyanide complex reached the maximum values as 97.2%,96%and 97.7%respectively.The removal of cyanide and organic matter in the electrolytic oxidation process was mainly due to the indirect oxidation of ClO^(-)produced by Cl^(-)in the solution.Cl^(-)was oxidized to produce Cl 2 and ClO^(-)on the anode surface,which oxidized and degraded the pollutants in the solution.The copper-cyanide complex ions released by oxidation at the anode migrate in a directional manner to the cathode where they are reduced to produce Cu metal monomers that are deposited on the cathode plate.

关 键 词：电解氧化 活性氯 氰化物 COD 

分 类 号：TF09[冶金工程—冶金物理化学]