Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1994-07-01
1995-12-26
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204105R, 204108, 204112, 204115, 204119, C23G 136
Patent
active
054784484
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.
REFERENCES:
patent: 2810686 (1957-10-01), Bodamer
patent: 4073709 (1978-02-01), Schneider
patent: 4973380 (1990-11-01), Pryor et al.
Bramer, H. C., Electrolytic Regeneration of Spent Pickling Solutions, Ind. 2nd Engr. Chemistry vol. 47 No. 1 (1955) pp. 67-70 (no month).
Chemical Abstracts, vol. 84, No. 16, Abstract No. 84: 109068p (1976) (no month).
Heraeus Elektrochemie GmbH
Niebling John
Phasge Arun S,.
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