Process for the removal of alkali metal nitrite from nitrate con

Details Process for the removal of alkali metal nitrite from nitrate con Process for the removal of alkali metal nitrite from nitrate con

1986-08-05

1988-01-05

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148 155, 148128, 423179, 423395, 252 71, C21D 1607

Patent

active

047174293

ABSTRACT:
Undesired nitrites are formed during the treatment of salt bath nitrided structural components of iron and steel in nitrate containing cooling baths, and they must be removed from the washing water. The build-up of nitrites can be avoided by oxidizing the nitrite in the salt bath into nitrate by passing air into the cooling bath during off-times.

REFERENCES:
patent: 3793208 (1974-02-01), Foreman
patent: 3966508 (1976-06-01), Mohr
patent: 4158579 (1979-06-01), Foreman et al.
patent: 4396439 (1983-08-01), Foreman
patent: 4568352 (1986-02-01), Fiorucci et al.

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