镀锌层退镀液的处理技术研究

Study on technology of treating waste liquid originated from zincification layer

本文研究了用Ｎ５０３ － 煤油体系回收镀锌层退镀液中锌的工艺条件，并进行了实验室三级逆流串级模拟实验，结果表明，含锌４０ ～６０ ｇ／Ｌ 的退镀液（ 不需任何处理） ，直接用Ｎ５０３ － 煤油作为有机相经三级萃取后，锌的回收率可达９９ ．９５ ％ 。（ 萃余液中剩余锌２０ ～３０ ｍｇ／Ｌ） 萃取机理研究表明：锌以络合酸Ｈ２ＺｎＣｌ４ 形式进入有机相，其萃合物的溶剂化数为２ 。

Research the technologic condition of recycling Zn from waste liquid originated from zincification layer by N 503 -kerosene system and make third-class reflux simulation experiment in series on laboratory scale.The result indicated that waste liquid originated from zincification layer(without any treatment)containing 40-60 g/L Zn is treated by N 503 -kerosene as organic phase,the recycling rate of Zn can reach to 99.95%(the content of Zn in extractive liquid is 20-30 mg/L).The mechanism of extraction indicate that Zn go into organic phase in the type of H 2 ZnCl 4 and solvent coefficient of extraction is 2.