WET SCRUBBING METHOD OF POTROOM EXIT GASES OF ALUMINIUM PRODUCTION Russian patent published in 2017 - IPC B01D53/78 B01D53/48 B01D53/68 C01D5/00 C01F11/22 

FIELD: metallurgy.

SUBSTANCE: wet scrubbing method of potroom exit gases of aluminium production comprises a gas scrubbing of hydrogen fluoride and sulfur compounds by its irrigation by soda-sulfate solution, separation of anhydrous sodium sulfate in evaporator, in this case, gas irrigation by soda-sulfate solution is carried out to obtain a saturated soda-sulfate solution, a portion of which is fed in the evaporator and concentrated until a limiting concentration of sodium sulfate, and the remaining solution is sent to sedimentation, followed by returning to the irrigation stage, and the solution evaporated with sodium sulphate is directed to dewatering and drying followed by obtaining the finished sodium sulfate, and after evaporation, the mother liquor is re-directed to the evaporator.

EFFECT: improved quality of sodium sulfate.

4 cl, 1 dwg