Abstract
The recovery of waste acid has been successfully achieved for a number of years using various processes. DD (Diffusion Dialysis) has been shown to be an attractive process on a commercial scale, because of its simplicity, reliability and relatively low operating cost.
DD has been particularly successful in the recovery of relatively expensive acids such as HF and HN03. However, with increasingly strict control of waste stream quality, the recovery of even less expensive acids has been found of interest.
Recovery of acids by means of DD is in the range of 80 – 90%, treating acids in a concentration range of 1 – 7 Normal. It is possible to attain salt content as low as 10 ppm, by the use of Neosepta AHS-2.
Recently, new membranes have been developed which can be used in the DD process for the recovery of bases. Base permeable membranes are of particular interest to industries where basic surface treatment is involved, such as surface etching of aluminium in the aerospace industry. An industrial plant for the treatment of aluminium etchant has recently been built. This involves a system which maintains the purity of the etching solution and controls the metal level without giving rise to a waste stream; DD is an important component of the system.
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© 1994 Springer Science+Business Media Dordrecht
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Herz, G.P., Byszewski, C., Jaffari, M. (1994). Recovery of acids and bases used in metal treatment processes by diffusion dialysis. In: Hydrometallurgy ’94. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1214-7_40
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DOI: https://doi.org/10.1007/978-94-011-1214-7_40
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-4532-2
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