Abstract: The invention provides a system and a process for collecting effluents produced by an electrolytic cell intended for the production of aluminium and for drawing said effluents away from the cell in a flow of gas. The system comprising a hooding to confine the effluents, at least one outlet channel to collect said flow of gas and suction means to draw said flow of gas away from the cell. The hooding includes removable hoods and, optionally, at least one door to get access to the inside of the hooding. The system further comprises at least one pipe for blowing pressurized air within the outlet channel so as to increase the rate of said flow of gas. Pressurized air supply is activated at a specified pressure Po so as to obtain a specified flow rate Ro.

Abstract: The invention relates to a process and an installation for the treatment of gaseous effluents produced by at least one electrolytic cell (1) in which the effluents are conveyed by at least one conveyance duct (11) to treatment means (12-19) comprising at least one reactor (12) to extract fluorinated products contained in effluents by reaction with powder alumina (16) and a separation device (13) to separate the alumina output from the reactor (12) from the residual gas fraction and comprising filter means (14). According to the invention, the effluents are cooled before being treated by the injection of droplets of a cooling fluid into the conveyance duct(s) (11) at at least one point (P) located upstream of the reactor (12), and by vaporisation of the said fluid. The invention provides an efficient means of cooling effluents from electrolytic cells without affecting their operation.