Method for purifying the liquor of a galvanizing process plant a

Details Method for purifying the liquor of a galvanizing process plant a Method for purifying the liquor of a galvanizing process plant a

1978-06-05

1979-04-10

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204104, 204112, 204295, C25B 122, C25C 106, C25B 1302, C25B 1308

Patent

active

041487001

ABSTRACT:
A method of purifying a galvanizing and/or metal cleaning plant pickle liquor to enable repetitive re-use of the acid which includes the steps of placing a cathode and an anode in the spent acid (pickle liquor) and passing a DC current therethrough. The cathode and anode are separated in the pickle liquor solution by a permeable diaphragm which permits transfer therethrough of the metal ions and the acid anions. Metal molecules in the liquor such as iron, zinc, etc., are recovered upon their adherence to the cathode. The recovery is about 80 to 90 percent of the total metal ion content on that side of the diaphragm. The iron in solution is removed from that side of the tank and it is transferred to a precipitator tank. There, a neutralizing base is added to precipitate the remaining iron typically as a ferric hydroxide out of the tank. Pickle liquor in the form of the spent acid and metal ions is continuously added on the cathode side of the diaphragm while purified acid flow is recovered from the anode side of the membrane for return for re-use. The diaphragm is able to pass ions stripped of the water of hydration.

REFERENCES:
patent: 3679538 (1972-07-01), Druin et al.

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