Title: Recovery of spent pickle liquor and iron metal

Abstract: Spent sulfuric acid pickle liquor containing ferrous ion is regenerated and iron metal is recovered therefrom by electrolysis in a cell having an anode in an anode chamber and a cathode in a cathode chamber separated by a cation-selective membrane. The spent pickle liquor is placed in the cathode chamber, aqueous ammonium sulfate solution is placed in the anode chamber, and electrical current is passed through the cell. Iron plates out on the cathode. Ammonium ion passes through the membrane into the cathode chamber to form aqueous ammonium sulfate solution therein, and the ammonium sulfate anolyte is converted to sulfuric acid solution useful for pickling. Ammonium sulfate solution from the cathode chamber is recycled to the anode chamber and the process is repeated with fresh spent pickle liquor.

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Inventors: Burke, Zane L. (Whittier, CA, US)

Application Number: 888527
Filing Date: 1978-03-21
Publication_date: 1979-04-17
Assignee: Davis Walker Corporation (Los Angeles, CA)
Primary Class(es): 205/587 204/520, 205/750, 205/770
Other Classes:
US Patent Ref:

3470044	Sep, 1969	Radimer	204/151.
3761369	Sep, 1973	Tirrell	204/151.
3764503	Oct, 1973	Lancy et al.	204/151.
3788959	Jan, 1974	Smith	204/180.

Other Refs:
Primary Examiner: Prescott, Arthur C.
Assistant Examiner:
Attorney: Christie, Parker & Hale