Method for controlling the detoxification of cyanidic waste wate

Details Method for controlling the detoxification of cyanidic waste wate Method for controlling the detoxification of cyanidic waste wate

1994-12-05

1996-10-29

McCarthy, Neil

Liquid purification or separation

Processes

Including controlling process in response to a sensed condition

210758, 210904, 210912, 210743, C02F 172, C02F 162

Patent

active

055693865

ABSTRACT:
A method for controlling the detoxification of aqueous solutions containing cyanides and/or cyano complexes, in particular zinc cyano complexes, with the use of a source for formaldehyde for glycolnitrile formation and a source for hydrogen peroxide for perhydrolysis of the glycolnitrile is disclosed. During the addition of the source for formaldehyde at a pH value in the range from 8.5 to 12 the pH value is kept constant by addition of an acid. The addition of the source for formaldehyde is discontinued if the pH value no longer increases.

REFERENCES:
patent: 3617582 (1971-11-01), Lawes
patent: 4731232 (1988-03-01), Fischer et al.
patent: 5204008 (1993-04-01), Diehl et al.
patent: 5207925 (1993-05-01), Steiner et al.
patent: 5306431 (1994-04-01), Fischer et al.

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