锌冶炼电解废水处理与回用技术研究

A Technology of Treatment and Reuse of Waste Water Produced by the Tank House of Zinc Plant

作者通过对锌冶炼电解废水处理与回用技术的研究，提出了采用超滤-纳滤膜分离法处理高浓度含锌和酸锌冶炼电解废水的新工艺。电解废水经膜分离处理后，浓缩液中锌浓度可达30g／L以上，回收后全部进锌冶炼系统，透过液中锌浓度在0．1g／L以下，用碱调节DH5-6后可回用于电解工序洗板，实现了废水资源化和车间废水零排放目标，具有显著的经济效益和环境效益。

The author describes the technologies of treatment and reuse of waster water high in Zinc and acid which is produced by the tank house of Zinc plant, and suggests that a new technology called UF- NF membrane separation should be used in this purpose. The said new technology will raise the Zinc concentration in the teated liquid to be higher than 30 g/L, and therefore the treated liquid can be reused as a process solution in a Zinc plant. The liquid permeating the membrane, with Zinc less than 0.1 g/L, is neutralised by alkali to a pH from about 5 to about 6, and then sent to tank house for electrode washing. The new technology will help Zinc industry achieve the resourcement and zero emission of waste water, and thus improve economic and evironmental profit of this industry.