Process for the production or recovery of acids from metalliferous solutions of such acids
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United States of America Patent
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Sep 22, 1992
Issued Date -
N/A
app pub date -
Nov 29, 1990
filing date -
Jun 16, 1987
priority date (Note) -
Expired
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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.
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