Process for the production or recovery of acids from...

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

C - Chemistry, Metallurgy

01

B

23/180, 23/208

C01B 7/19 (2006.01) C01B 21/38 (2006.01) C01B 21/46 (2006.01) C23F 1/46 (2006.01) C23G 1/36 (2006.01)

Patent

CA 1335150

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 neutralisation 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 to 500° in a reactor (1) and subsequent absorptions or condensation of the gases generated in column means (7, 8) at temperatures of 0 to 70°C.

569531

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