工具厂电镀车间清洁生产审核总结

为了促进工具厂的清洁生产,提高镍和铬的利用率,有效利用电镀废水,工具厂开展了清洁生产审核.审核过程中,在镀镍槽后增设2个静止的回收清洗槽,每生产班次都对挂具刷绝缘漆,通过镍的物流实测验证,镍的利用率从70%提高到87%.在镀铬槽后增设3个静止的回收清洗槽,并且使用稀土镀装饰铬,铬酐浓度为150～180g/L,并且添加抑雾剂F-53,通过铬的物流实测验证,发现铬的利用率从15%提高到43%.考虑工具厂各生产车间的用水要求,在全厂范围对电镀废水进行合理调配,电镀车间外排的废水被蒸发,实现电镀废水零排放,为电镀行业的清洁生产提供一种新思路.

Auditing Summary of Clean Production at Plating Unit of Tool Plant

The auditing of clean production at the plating unit of a tool plant was carried out so as to strengthen the clean production, raise the utilizing rate of nickel and chromium, and make use of plating liquid waste more effectively. Thus two quiescent troughs for recovery and rinsing were linked to the nickel-plating trough and insulative lacquer was painted on the hanging units at every shift. The utilizing rate of nickel was then determined by measurement of the flowing fluids. Similarly, three quiescent troughs for recovery and rinsing were linked to the chromium-plating trough, while thulium additive was used for decorative chromium plating at a concentration of chromic acid of 150~180 g/L and in the presence of F-53 as a chromium-fog restraining agent. The utilizing rate of chromium was then determined by measurement of the flowing fluids. It was found that after introducing the nickel and chromium troughs for recovery and rinsing, the utilizing rate of nickel increased from 70% to 87%, while that of chromium increased from 15% to 43%. Moreover, on consideration of the requirements for water in every workshop of the tool plant, it was suggested to properly control the plating liquid wastes in the whole plant and remove the plating liquid wastes at the plating unit by vaporizing, which would help to realize zero discharge and meet the requirement for clean production in the field of electroplating.