Decreasing the cyanide and heavy metal content of an aqueous sol

Details Decreasing the cyanide and heavy metal content of an aqueous sol Decreasing the cyanide and heavy metal content of an aqueous sol

1975-11-28

1976-07-20

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 72, 204110, 204130, 204131, 204151, 204152, C02B 182, C25F 700, C25F 702

Patent

active

039705315

ABSTRACT:
Apparatus and method are provided for concurrently decreasing the cyanide and heavy metal content of an aqueous solution, such as a waste water.
The apparatus comprises an electrochemical cell provided with separate cathode and anode compartments. Each of the compartments contains a bed of electrically conductive particles. The compartments are separated by an electronically nonconductive foraminous member.
In accordance with the method, an aqueous solution containing cyanide ion and at least one heavy metal in soluble form is passed sequentially through the beds of electrically conductive particles contained in each of two compartments of an electrochemical cell. A direct electric current is passed between the two compartments making one compartment cathodic and the other anodic. The heavy metal is deposited upon the particles in the cathodic compartment and the cyanide is oxidized in the anodic compartment. The aqueous solution having a substantially reduced cyanide and heavy metal content then is discharged from the electrochemical cell.

REFERENCES:
patent: 3457152 (1969-07-01), Maloney, Jr. et al.
patent: 3616356 (1971-10-01), Roy
patent: 3645867 (1972-02-01), Ericson et al.
patent: 3756932 (1973-09-01), Zievers et al.
patent: 3764499 (1973-10-01), Okubo et al.

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