The pickling rate with 7710 depends only on the 7710 concentration and pickling solution temperature. The build-up of copper does not effect pickling rates in any way until the bath is saturated with cupric ions. Crystallization is adaptable to continuous operation and can be concentrated. This recovery method takes advantage of the decrease in copper sulfate solubility with decreasing temperatures. The use of a centrifugal filter on a continuous basis is suggested for large scale installations.
Centrifugal filters can produce a relatively dry salt.
3 Recovery - this method of copper recovery has the advantage of recovering copper as metal and regenerating the acid in the process. Electrolytic recovery of copper from 7710 solution is quite simple. Contact General Chemical for suggestions on electrolytic recovery relative to your specific plant application. In solution, various compositions are possible, depending upon the particular requirement and the alloy to be picked. The higher temperatures give higher pickling rates.