Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1975-03-05
1976-07-13
Mack, John H.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 93, 204104, 204112, 204130, 204151, C25F 702
Patent
active
039692078
ABSTRACT:
The invention relates to a process for the cyclic electrochemical processing of pickle waste liquors containing a maximum 100 g. of sulfuric acid and a minimum of 25 g. of iron ions per liter, combined with the pickling of iron. According to the invention the ammonium, magnesium or alkali-metal sulfate concentration of the waste liquor is adjusted to 0.5-1.0 mol./l. by introducing an appropriate salt, and the acid content of the waste liquor is reduced to a value not exceeding 100 g. of sulfuric acid/liter, then the waste liquir is fed into and passed through the cathode chambers of an electrolysis apparatus consisting of a series of dual electrolytic cells with diaphragms, whereupon the iron content of the waste liquor is reduced to a value of 7-15 g. of Fe.sup.2.sup.+ /liter, thereafter the waste liquor is fed into and passed through the anode chambers of said electrolysis equipment in parallel with the cathode flow, and a current density of 15-22 A/dm.sup.2. of diaphragm surface and an electrolysis temperature of 70.degree.-90.degree.C is maintained.
REFERENCES:
patent: 984703 (1911-02-01), Ramage
patent: 1007388 (1911-10-01), Ramage
patent: 1375631 (1921-04-01), Haglund
patent: 1397562 (1921-11-01), Thatcher
patent: 1954664 (1934-04-01), Cain
patent: 2865823 (1958-12-01), Harris et al.
Kerti Jozsef
Mandoki Andor
Szeky Miklos
"Licencia" Talalmanyokat Ertekesito Vallalat
Dubno Herbert
Mack John H.
Prescott A. C.
Ross Karl F.
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