Electrolytic metal recovery cell and operation thereof

Details Electrolytic metal recovery cell and operation thereof Electrolytic metal recovery cell and operation thereof

1983-01-10

1983-09-27

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

204109, 204212, 204216, 204272, C25D 120, C25D 1712

Patent

active

044067534

ABSTRACT:
An electrolytic metal recovery cell is described in which a cylindrical cathode is mounted for rotation in a housing having an inlet and outlet for solution from which metal is to be recovered. The housing contains an anode and a cutter blade is mounted so as to be capable of removing metal deposited over the whole face of the cathode when the cell is in use. In order to control the operation of the cell, electrical means are provided for operating the cutter blade at predetermined intervals of time irrespective of the electrolysis conditions and for operating the cutter blade when a monitored cathode potential deviates a predetermined amount from a desired value.
By this means the use of previously proposed scrapers and their attendant disadvantages are avoided and the cell can be easily controlled either under steady state electrolytic conditions or even when there are large variations in the concentration of the metal ions in solution.
The cell and its operation are described for use in the recovery of silver from spent photographic fixing solutions but may be used to recover metals other than silver.

REFERENCES:
patent: 1254056 (1918-01-01), Moore
patent: 1535577 (1925-04-01), Cleave
patent: 1959376 (1934-05-01), Lucas
patent: 3560366 (1971-02-01), Fisher
patent: 4292163 (1981-09-01), King
Gabe, Journal of Applied Electrochemistry 4, 91-108, (1974).

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