Pollution Prevention and Control Technologies for Plating
Section 4 - Chemical Solution Maintenance
4.5 ACID SORPTION
4.5.2 Development and Commercialization
This technology is not widely used by the plating industry and
it is not well documented in most common electroplating references.
Therefore, tracing its origin has been difficult. The Metals Handbook,
Vol. 5 (1982) indicated that acid sorption "has recently
seen extensive application in the metal finishing industry for
acid recovery" (ref. 340). Examples of applications given
in that reference include the purification of sulfuric, hydrochloric
and nitric acids. The only manufacturer of acid sorption equipment
identified during the Vendors Survey, Eco-Tec, commercialized
their equipment (APUª) in 1977 (ref. 363). As of 1993, Eco-Tec
has sold approximately 200 units. The APUª was originally
manufactured for the recovery of sulfuric acid anodizing solutions.
However, as early as 1978 the technology was also applied to the
purification of nitric acid rack stripping (nickel) baths (ref.
In addition to the metal finishing industry, acid sorption is
applicable to other industries that use strong acids, including
the primary metals manufacturing and metals forming industries.
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