| 摘要 |
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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