C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
C25C 1/00 (2006.01) C23G 1/36 (2006.01) C25B 1/00 (2006.01) C25C 7/04 (2006.01)
Patent
CA 2097868
ABSTRACT OF THE DISCLOSURE For the purpose of regeneration, an aqueous solution containing metal ions and sulphuric acid, in particular a solution containing zinc ions, iron ions and/or copper ions, is introduced into the catholyte chamber of an electrolytic cell which is subdivided by means of an anion exchange membrane into an anolyte and a catholyte chamber, and the metal ions are cathodically deposited in the catholyte chamber; and sulphate ions migrate out of the catholyte chamber through the anion exchange membrane into the anolyte chamber because of the voltage applied to the electrodes; and in the anolyte chamber, sulphuric acid is generated by means of the protons formed there by anodic hydrolysis, and the concentration of sulphuric acid in the anolyte constantly increases. A pure, highly concentrated sulphuric acid, which can be reused for pickling or extraction processes, is formed in the anolyte chamber. The regeneration is intended to be used as an intermediate step in the regeneration of pickling or extraction solutions without the production of chlorine gas
Blatt Wolfgang
Schneider Lothar
Stroder Ulrich
Gowling Lafleur Henderson Llp
Heraeus Elektrochemie Gmbh
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