INTEGRATED GAS TREATMENT Russian patent published in 2018 - IPC C22B7/04 

FIELD: technological processes.

SUBSTANCE: invention relates to a method and system for integrated gas purification during the production of aluminium by electrolysis in an electrolytic cell. Method comprises delivering non-fluorinated alumina to an electrolytic cell comprising a housing, wherein an upper area of the housing represents a superstructure, and at least one of the non-fluorinated alumina and fluorinated alumina forms a fluidised bed within the superstructure, removing gaseous fluorides from process gases produced by the electrolytic cell by adsorbing the gaseous fluorides using the non-fluorinated alumina in the fluidised bed, the adsorption of the gaseous fluorides by the non-fluorinated alumina creating the fluorinated alumina and semi-scrubbed process gases, filtering fluoride particulates entrained in the semi-scrubbed process gases, the filtering occurring within the superstructure above the fluidised bed, producing scrubbed process gases; and venting the scrubbed process gases from the superstructure to an open environment outside the electrolytic cell. Disclosed is a system for producing aluminium from alumina in an electrolytic cell comprising a housing with a superstructure in its upper area, a porous surface within the superstructure for supporting a fluidised bed comprising non-fluorinated alumina and fluorinated alumina, and a ventilation system operatively connecting an opening in the superstructure to an open environment outside the electrolytic cell and comprising a scrubbed process gas plenum positioned within the superstructure above the porous surface, and a scrubbed process gas duct.

EFFECT: reduction of capital and operating costs of an aluminium production system and improvement of the environmental impact of the smelting process using an integrated gas treatment system to remove and filter environmentally hazardous gases and particulates from each electrolytic cell in the smelting process.

20 cl, 4 dwg