Process and apparatus for regenerating an aqueous solution containing metal ions and sulfuric acid
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United States of America Patent
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Dec 26, 1995
Grant Date -
N/A
app pub date -
Jul 1, 1994
filing date -
Aug 11, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aqueous solution containing metal ions and sulfuric acid, especially a solution containing zinc ions, iron ions and/or copper ions, is placed for the cathodic precipitation of the metal ions into the anolyte chamber of an electrolysis cell divided by a cation exchanger membrane. Due to the voltage applied to the electrodes, metal ions and hydrogen ions migrate from the anolyte through the cation exchange membranes into the catholyte chamber and are there discharged, the sulfuric acid concentration in the anolyte being constantly elevated by anodic formation of protons. The regeneration can be used as an intermediate step of a chlorine gas-free regeneration of etching or extraction solutions.
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