Improved capture of gas-derived SO from electrolytic cells using a set of filter modules 2 process and equipment

Abstract

The invention relates to a method for capturing SO present in gases originating from electrolytic cells for the industrial production of aluminum by molten salt electrolysis 2 The process and its device consist of a set of at least two filter modules (2 1 ,2 2 ,…,2 n ) is implemented, and the gas stream to be purified passes through the filter modules in parallel, the filter modules are at least partially fed into the powdery material type adsorbent in at least one series, the exhaust gas present in the gas stream can be adsorbed by the contact of the adsorbent with the gas stream, each filter module (2 1 ,2 2 ,…,2 n ,) have collection means (10) for collecting said adsorbent after contact with said gas stream (3) in said filtration module, and discharge means (11) for separating the collected and The adsorbent after contact with the gas stream (3) is discharged to the at least one other filter module (2 1 ,2 2 ,…,2 n ) in the injection device (16), except each series-connected terminal filter module, and at the terminal filter module outlet, the airflow is introduced into (20 n‑1 ,20 n ) in the desulfurization unit (21).

Description

technical field [0001] The present invention relates to a method for capturing sulfur dioxide (SO 2 ) process and device thereof, the gas originates from an electrolytic cell for industrialized production of aluminum through molten salt electrolysis. The process is carried out by a gas treatment center, which includes at least two filter modules, and the gas stream to be purified passes through the two filter modules in parallel, each module includes a gas flow reactor and is connected to a subsequent filter device. A pulverulent material-type adsorbent, usually alumina particles, is fed at least partly to at least one reactor in series or in some cascades to adsorb all the presence of exhaust. Background technique [0002] The use of alumina particles in gas processing reactors to adsorb hydrofluoric acid (HF) present in electrolytic cell gases for the industrial production of aluminum by molten salt electrolysis is a well known and efficient technology. It is well known...

AI Technical Summary

Problems solved by technology

This configuration made it possible to reveal the adsorption of SO on fresh alumina 2 capacity, especially in the first or upstream modules, that is, the amount of fluorine gas adsorbed on the alumina is not sufficient to prevent the adsorption of SO in the cascaded terminal modules or downstream modules 2 In the module, on the contrary, if the fluorine gas is gradually reduced, it will lead to the adsorption of SO on the alumina 2 loss of ability

Images