Treatment of effluents

Details Treatment of effluents Treatment of effluents

1977-07-12

1978-11-28

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204149, C25C 120

Patent

active

041274580

ABSTRACT:
A process for recovering platinum group metal present as a stable complex dissolved in an aqueous effluent from a platinum group metals refinery which comprises (1) adjusting the pH of the effluent as necessary to an alkaline pH of at least 10; (2) heating the effluent to a temperature above 60.degree. C; (3) electrolyzing the effluent at said temperature and alkaline pH using an electrode comprising at least one metal selected from the group consisting of Ru, Rh, Pd, Ir, Pt and alloys thereof at an anode potential having a half-cell voltage of at least 7.5 volts and a current density of at least 0.2 A/cm.sup.2 so as to break down said complex by anodic oxidation and precipitate metal present in the complex; and (4) filtering off the thus precipitated metal.

REFERENCES:
patent: 3244605 (1966-04-01), Hotchkiss et al.
patent: 3649485 (1972-03-01), Chisholm
patent: 3674675 (1972-07-01), Leaman
patent: 3778307 (1973-12-01), Beer
patent: 3784456 (1974-01-01), Otto
patent: 3970531 (1976-07-01), Recht

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