Method for recovery of metals from metal plating baths and neutr

Details Method for recovery of metals from metal plating baths and neutr Method for recovery of metals from metal plating baths and neutr

1977-02-18

1979-06-12

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204238, 204DIG13, 423 55, C25D 548

Patent

active

041579429

ABSTRACT:
Method for recovering metals from cyanide and hexavalent chromium plating baths comprising immersing plated articles in a reclaiming bath containing an aldehyde or an aldehyde percursor, and optionally an oxidizing agent, to precipitate the excess metal in the residual plating bath in the form of free metal or metal hydroxide and to decompose the cyanide and to reduce the hexavalent chromium to trivalent chromium. The plating bath and reclaiming bath are regenerated. Apparatus is provided to effect this process.

REFERENCES:
patent: 3617567 (1971-11-01), Mathre
patent: 3661732 (1972-05-01), Withrow
patent: 3681210 (1972-08-01), Zievers et al.
patent: 3761381 (1973-09-01), Yagishita
patent: 3896209 (1975-07-01), Fournier et al.
patent: 3947283 (1976-03-01), Uchikawa et al.
patent: 3961029 (1976-06-01), Senoo
patent: 3985628 (1976-10-01), Myers
Kraljik, John; "Practical Guide to Treatment of Chromium Waste Liquors" Metal Finishing, Oct. 1975, pp. 49-55.
Chemical Week, Dec. 16, 1970, pp. 54-55, "Zeroing in on Plating Wastes".

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