Application of Solvent Extraction to Treatment of Electroless Nickel Plating Wastewater.
Application of Solvent Extraction to Treatment of Electroless Nickel Plating Wastewater.
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溶剂萃取在化学镀镍废水处理中的应用。
DOI：
10.2473/shigentosozai.114.63
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Keiko Kenchu
中科院分区：
文献类型：
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作者：
Masakazu Niinae;A. Itoh;Keiko Kenchu
化学镀作为一种表面处理技术被广泛应用于电子、半导体和汽车行业，因为均匀厚度的金属可以沉积在形状复杂的塑料、陶瓷或聚合物上。最重要的是，以次亚磷酸盐为还原剂的化学镀镍因其具有优异的耐蚀性、润滑性和磁性而受到广泛的关注和研究。然而，在这一过程中，随着金属沉积的进行，镀液中的亚磷酸增加，从而导致镀液的降解。因此，在发生降解之前，浴缸本身必须在一定次数的翻转后处理。化学镀镍废液中含有大量的镍、次亚磷酸盐、亚磷酸盐以及柠檬酸、苹果酸、琥珀酸等有机化合物。它对环境危害很大，同时，如果处理得当，这些危险废物可以被视为资源。因此，开发一种有效的萃取技术分别去除这些化学物质是非常重要的。本文研究了溶剂萃取法在化学镀镍废水处理中的应用。在苛性碱性电镀废水的处理中，TOMAC有利于镍和柠檬酸盐的提取，有利于次亚磷酸盐和亚磷酸盐的分离。TOMAC用于氨性碱性电镀废水的处理难度较大，而采用LiX-26等络合萃取剂有利于镍的提取。同时，溶剂萃取法在酸性电镀废水处理中的应用也比较困难。
Electroless plating is widely used in electronics, semiconductor and automobile industries as a surface treatment technique, because uniform thickness metal can be deposited on plastics, ceramics or polymers with intricately shaped surfaces. Above all, electroless nickel plating using hypophosphite as a reducing agent is very popular and has been studied a lot, since it gives excellent plated metal surfaces with corrosion resistance, lubricity and magnetic properties. As metal deposition progresses in this process, however, phosphorous acid increases in the plating bath, which causes degradation of the bath solution. Therefore, the bath itself must be disposed after a certain number of turnovers before the degradation occurs. The waste solution from electroless nickel plating bath contains a large quantity of nickel, hypophosphite, phosphite and organic compounds such as citrate, malate or succinate. It is quite harmful to the environment and at the same time, these hazardous wastes can be viewed as resources if properly handled. Therefore, it is very important to develop an effective extraction technique removing these chemical substances separately.In the present study, the application of solvent extraction to the treatment of electroless nickel plating waste water was investigated. In the treatment of caustic alkaline plating waste water, TOMAC is favorable to the extraction of nickel and citrate, and the separation from hypophosphite and phosphite. It is difficult to apply TOMAC to the treatment of ammoniacal alkaline plating waste water, while the use of chelating extractants such as LIX 26 is favorable to extraction of nickel. Meanwhile, the application of solvent extraction to the treatment of acidic plating waste water is difficult.