Abstract
Studies on the treatment of citrate buffered gold plating rinse were carried out with four types of membranes. For three membranes (NS-200, polybenzimidazolone, aromatic polyamide), the rejections of gold were more than 92% in the initial stage of the concentration process, but they decreased remarkably with the increase in the concentration of the feed. For the cellulose acetate membrane, negative rejection was observed as Golomb pointed out. To understand the phenomena more clearly, the relationship between the state of the species in the solution and their permeation behavior was investigated in detail. It was shown that in multiion solutions such as gold plating rinse, a less permeable ion such as the citrate ion improved the permeability of a more permeable ion of like charge such as Au(CN) - 2. Therefore the recovery of gold was as low as 85% at most in a five-fold concentration of the rinse.
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