Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1987-04-21
1987-12-29
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204115, 204119, 204130, 204151, 75115, 75120, 423106, 423109, 423544, 423622, B01D 1302
Patent
active
047159391
ABSTRACT:
Monovalent ions, especially chloride and fluoride, but also thallium, sodium and potassium are efficiently removed from ZnSO.sub.4 electrolyte by electrodialysis. Monovalent anions are removed using alternating monovalent anion permselective membranes and cation exchange membranes. Monovalent anions and cations are removed using alternating monovalent anion and monovalent cation permselective membranes. Electrodialysis is carried out under turbulent conditions, at up to 60.degree. C., a differential membrane pressure of less than 150 kPa, a current density of 10 to 500 A/m.sup.2, and a pH of less than 5.5. Where both chloride and fluoride are removed a pH of 3.5 to 5.5 is maintained. Deposition of manganese and zinc on the electrodes is minimized by at least one of a number of means including arranging the membranes such that the end membranes are monovalent anion permselective; selecting a large electrode rinse flow; adding a small amount of soluble antimony and/or cobalt; and using a cathode made of a material that promotes hydrogen evolution over zinc deposition. The electrode compartments are preferably rinsed with a 0.1 to 1.0 M Na.sub.2 SO.sub.4 solution at pH 0 to 4.
REFERENCES:
patent: 903732 (1908-11-01), Laist
patent: 1403065 (1922-01-01), Avery et al.
patent: 1901592 (1933-03-01), O'Brien et al.
patent: 3673067 (1972-06-01), Harwood et al.
patent: 3926759 (1975-12-01), Horn et al.
patent: 3958986 (1976-05-01), Thorsen
patent: 4005174 (1977-01-01), Bodson
patent: 4207157 (1980-06-01), Hirai et al.
patent: 4263109 (1981-04-01), Swinkels et al.
patent: 4325792 (1982-04-01), Vaughan
patent: 4636295 (1987-01-01), Ball et al.
C.A.90, 159167q ('79) (JA Kokai 79 14323) Acid ZnSO4 from Galvanizing . . . is Electro-Dialyzed at 500 A/m.sup.2 for 10 h.
Ball Donald L.
Boateng Daniel A. D.
Cominco Ltd.
Delbridge Robert F.
Fors Arne I.
Niebling John F.
Starsiak John S.
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