Process for the production or recovery of acids from metallifero

Details Process for the production or recovery of acids from metallifero Process for the production or recovery of acids from metallifero

1990-11-29

1992-09-22

Langel, Wayne

Chemistry of inorganic compounds

Nitrogen or compound thereof

Oxygen containing

423483, 423484, 423592, 423DIG1, C01B 1314, C01B 2140

Patent

active

051495155

ABSTRACT:
During the pickling, etching, chemical shaping etc. of steels, stainless steels, special alloys and special metals and the dissolution of those metals, metalliferous solutions of the acids employed arise in the course of such processes which must either be disposed of by neutralization or be used for the recovery of the acids and metals by expensive processes. According to the invention the production or recovery of nitric acid or a mixture of nitric acid and hydrofluoric acid takes place by spray-roasting the solutions at temperatures of 200.degree. to 500.degree. in a reactor (1) and subsequent absorptions or condensation of the gases generated in column means (7, 8) at temperatures of 0.degree. to 70.degree. C.

REFERENCES:
patent: 1273991 (1918-07-01), Bergve
patent: 2155119 (1939-04-01), Ebner
patent: 2771344 (1956-11-01), Michel et al.
patent: 3310435 (1967-03-01), Robinson et al.
patent: 3658483 (1972-04-01), Lienau et al.
patent: 3745207 (1973-07-01), Hansen
patent: 3800024 (1974-03-01), Forsell et al.
patent: 3991167 (1976-11-01), Depommier et al.
patent: 4083693 (1978-04-01), Hansen
patent: 4325935 (1982-04-01), Krepler
patent: 4341747 (1982-07-01), Downey

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