FIELD: production of aluminum in Hall electrolyzer. SUBSTANCE: Hall electrolyzer with electrolytic reduction of aluminum oxide in molten fluoride electrolyte containing cryolite has side wall which has insulating material and lining. Side wall insulating material has thickness sufficient for prevention of cryolite solidification in any point of lining made of ceramic material taken from group including silicon nitrile, silicon carbide and boron carbide featuring density equalling at least 95% of theoretical density and having at least closed and no visible porosity. EFFECT: higher thermal efficiency and increased protection of side wall from cryolite penetration. 39 cl, 1 dwg
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