Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-03-12
1992-02-18
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204129, 204130, C25C 120
Patent
active
050890972
ABSTRACT:
The improved method and apparatus for recovering silver from a waste photographic processing solution, in which the waste solution is supplied into the cathode compartment of an electrolytic cell which is separated from an anode compartment by a diaphragm, and electrolysis is performed with the current density at cathode and the current concentration in the cathode compartment controlled in such a way that silver ions are reduced in said waste solution with the hydrogen bubbles evolved by electrolytic reaction, and the reduced silver ions are precipitated as silver grains in the waste photographic processing solution.
REFERENCES:
patent: 4111766 (1978-09-01), Idota et al.
patent: 4129441 (1978-12-01), Kunda et al.
Goto Nobutaka
Koboshi Shigeharu
Makida Yoshiyuki
Takabayashi Naoki
Konica Corporation
Niebling John
Ryser David G.
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