镀件逆流清洗浓度计算公式应用探讨（下）

2问歇换水逆流清洗各级浓度分析2．1理论公式的推导设有间歇换水5级逆流清洗系统,当第5级镀液浓度达到某一限定值时,便将第1级的清洗水送去回收,将第2级的清洗水倒换到第1级,将第3级的清洗水倒换到第2级,依此类推,最后倒空的第5级加入不含镀液成分的纯水。各级的浸洗与喷洗都各自独立。

Application of Computational Formula for Adverse Current Washing of Electroplated Wares(Part 2)

Theoretical formulae to calculate various concentrations of continuous adverse current cleaning with interrupted water supplement and continuous adverse current cleaning with interval trough dumping were deduced so as to promote the application of adverse current cleaning process of electroplated wares.The approximate formula in design criterion GBJ 136-90 for management of electroplating wastewater was reviewed.The differences between all actual concentrations and theoretical concentrations were studied in combination with some examples.Some new suggestions had been given about the correction factor.Various modified cleaning methods were summarized.It was suggested that the cleaning method based on circulative stirring of pumps and self-spraying baptism combined with spray rinsing should be preferentially adopted.It was also suggested that attention should be paid to completely remove residual fluid during the process of trough dumping for adverse current cleaning with interval water replacement.