| abstract |
Process and system for the selective cutting of chlorides and fluorides, in particular from smoke or exhaust gases, in which HCl, HF are almost completely absorbed and SO ↓ 3 partially absorbed in a scrubbing circuit (1, 4, 5, 6, 7) by means of a highly concentrated calcium chloride solution . A portion of the loaded calcium chloride solution is discharged into a secondary circuit (14, 15, 21, 22, 27, 28, 29). The free acids contained therein are neutralized by adding alkali and / or alkaline earth metal oxides, hydroxides or carbonates. Only very small amounts of solid matter (CaSO ↓ 4 2H ↓ 2O, CaSO ↓ 3 1/2 H ↓ 2O) can form in the washing cycle, and only small amounts of wastewater highly concentrated with salts are discharged, which can easily be disposed of by spray drying, for example. |