Chemistry: electrical and wave energy – Processes and products
Patent
1989-04-04
1990-12-18
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
204149, 204DIG13, 204109, C25B 100, C25B 1500, C02F 146, C25C 122
Patent
active
049784331
ABSTRACT:
There is disclosed a method for recovering silver from photographic processing solution by electrolysis, in which method the cathode potential is set at a potential range wherein a precipitate of silver sulfide is formed in the electrolytic cell. According to the method, intensive silver recovering leading to low concentration of residual silver in the solution is achieved. Structure of electrolytic apparatus enabling easy separation of silver sulfide precipitates is also disclosed. Application of lead peroxide to the material of anode improves the life of the anode. Further advantages of the method are remarkable decreases in COD and iron contents of waste solution.
REFERENCES:
patent: 1937179 (1933-11-01), Weisberg et al.
patent: 3524805 (1970-08-01), Engelman
patent: 4013527 (1977-03-01), Idota et al.
patent: 4021319 (1977-05-01), Moeglich
patent: 4073705 (1978-02-01), Torikai et al.
patent: 4128464 (1978-12-01), Idota
patent: 4263108 (1981-04-01), Berg et al.
patent: 4776931 (1988-10-01), Hardy
patent: 4800005 (1989-01-01), Rosenfield et al.
patent: 4802961 (1989-02-01), Woog et al.
Iwano Haruhiko
Nakagawa Fumio
Fuji Photo Film Co. , Ltd.
Valentine Donald R.
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