Development of Simple Treatment Process of Etching Waste Liquor of Print Circuit Board Using Pseudo Liquid Membranes

本工作旨在开发一种从印刷电路板刻蚀废液中回收金属铜并实现酸循环利用的简单处理方法。在第一年(报告1)，(1)系统地选择了可以从高浓度酸废液中提取铜的萃取剂，(2)电拟液膜(ESPLIM)和(3)大块液膜(BLM)的实验工作。铜的部分回收和酸的循环利用是可能的。然而，ESPLIM的多阶段手术是必要的。对于BLM，传质速率的提高是必要的。第二年(报告2)，使用新开发的萃取剂继续进行主要(3)大块液膜(BLM)的实验工作。为了促进搅拌槽内的油滴与上述主体有机层的交换，引入了有机相强制循环。这使得有机相的快速交换和有效传质速率成为可能。然而，(4)蚀刻废液的可行性研究表明，大量的酸与铜一起提取是一个严重的问题。(5)液滴在电场中的行为和传质速率的估算被选为本工作的新目标。该模型成功地解释了观察到的分散和液滴的运动，使估计ESPLIM操作的整体提取能力成为可能。

This work was carried out with the aim of developing a simple treatment method of recovering copper metal and enabling the recycle use of acid from the etching waste liquor of print circuit board.In the first year (Report 1), (1)the systematic selection of extractant which can extract copper from the high concentration waste liquor of acid, (2)experimental work of Electric Pseudo Liquid Membrane (ESPLIM) and (3)Bulk Liquid Membrane (BLM) was carried out. The partial recovery of copper and the recycle use of acid were found possible. However, the multi stage operation was necessary for ESPLIM. In the case of BLM, the improvement of the mass transfer rate was necessary.In the second year (report 2), experimental work with mainly (3)Bulk Liquid Membrane (BLM) was continued with a newly-developed extractant. Forced circulation of the organic phase was introduced to promote the exchange of the oil drops in the stirred tank and the above bulk organic layer. This enabled the rapid exchange of the organic phases and the effective mass transfer rate. However, (4)the feasibility study of the etching waste liquor revealed that the extraction of a large amount of acid together with copper is a serious problem. New extractant which extract metal only is required.Because of the unfortunate results so far, (5)behavior of droplets in the electric field and the estimation of mass transfer rate was chosen as a new aim of the present work. The model which successfully explains the observed dispersion and the movement of the droplets made it possible to estimate the overall-extraction ability of ESPLIM operation.