Possibility in principle of low-alkalinity a-alumina from middling products of the aluminuos companies (to 0,1 % R₂O) processing the nephelininc raw materials is presented. Alumina with concentrate of alkalis of 0,033–0,055 % (mas.) and with the maintenance a-phases to 98 % is produced as a result from aluminuos dust cleaning of electrofilters of rotary calcination furnaces and furnaces of thermally activated aluminum hydroxide from oxides of alkiline metals and following glowing at 400 ^оС with mineralizers.