Chemistry of inorganic compounds – Nitrogen or compound thereof – Oxygen containing
Patent
1996-11-21
1999-11-09
Nguyen, Ngoc-Yen
Chemistry of inorganic compounds
Nitrogen or compound thereof
Oxygen containing
423488, 423484, 423DIG1, C01B 703, C01B 719, C01B 2138
Patent
active
059808500
ABSTRACT:
Process for extraction or recovery of acids, in particular hydrofluoric acid, hydrochloric acid and nitric acid, from solutions of these acids containing metal, by pyrohydrolytic treatment and subsequent absorption and/or condensation of the acid gases thus formed in an aqueous absorption solution, in which process the solids produced are removed. In order to guarantee economical acid recovery in existing plants without requiring large-scale adaptation, the waste pickling liquor is subjected to pre-concentration first of all before pyrohydrolysis, using the heat contained in the exhaust gas from the pyrohydrolysis. In a device for extraction or recovery of acids in particular hydrofluoric acid, hydrochloric acid and nitric acid, from solutions of these acids containing metal, comprising a feed pipe for the solution, a pyrohydrolysis reactor, and at least one absorption or condensation column connected to the exhaust gas pipe from the reactor, a device is provided for pre-concentration and upgrading of the solution.
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Translation of DE 4315551 (Nov. 1994).
Conners, "Hydrochloric Acid Regeneration as Applied to The Steel & Mineral Processing Industries", CIM Bulletin, pp. 75-91, Feb. 1975.
Andritz-Patentverwaltungs-Gesellschaft m.b.H.
Nguyen Ngoc-Yen
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