氰化电镀废液的处理  

Treatment of cyanide electroplating wastewater

作　　者：李雨[1] 刘定富[1] 舒刚[1] 

机构地区：[1]贵州大学,贵阳550025

出　　处：《环保科技》2015年第1期45-48,共4页Environmental Protection and Technology

摘　　要：针对位于城市中心企业搬迁后遗留的氰化电镀废液,提出详细的处置方法、原理和工艺。对CN-平均含量为26.09 g/L和60.32 g/L的氰化镀锌和氰化镀镉废液先稀释到10 g/L以下,采用二级破氰,第一阶段控制p H为11~13,m（Na Cl O）∶m（CN-）=4∶1;第二阶段控制p H为8.0~9.0,m（Na Cl O）∶m（CN-）=7.84∶1,并采用简单、便捷和利于现场操作的异烟酸-巴比妥酸和邻联甲苯胺指示剂作为判断投加次氯酸钠的终点,最终检测得CN-为0.280 mg/L,余氯量为0.48 mg/L,出水浓度达到GB21900—2008排放标准,这对工程实际操作具有指导意义。This paper presented a detailed method for disposal of the cyanide electroplating wastewater which was left behind by a factory having moved out of the city. The average cyanide con- tents in zinc plating wastewater and cadmium plating wastewater were 26.09 g/L and 60.32 g/L re- spectively. At first, the cyanide wastewaters were diluted into 10 g/L or less, and then two - staged cyanide breaking process was taken. At the first stage, pH was adjusted to 1 1 - 13, and m （NaClO） ： m （CN^-） was4 ： 1. At the secondary stage, pHwassetat8.0-9.0, and m（NaClO） ： m（CN^- ） at 7.84 ： 1. Meanwhile, Cl4H16N2 and C6H502 - C4H4N2O3 · 2H2O, which were convenient for the field operation, were used to determine the titration end of sodium hypo- chlorite. After the two - staged treatment, the cyanide in the wastewater was detected as 0.280 mg/L, and chlorine as 0. 48 mg/L, and the effluent could meet the emission standard of GB21900 -2008. Such disposal method for cyanide - containing wastewater was of significant in engineering practice.

关 键 词：氰化电镀 环保 次氯酸钠 余氯 

分 类 号：X703[环境科学与工程—环境工程]