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Airburn reaction and carboxy reaction result in the excess consumption of carbon anode in aluminum electrolysis.To reduce the excess carbon consumption, carbon anode was doped with aluminum-containing additives, such as Al, Al_4C_3,AlF_3 and Al_2O_3. Their reactivity in air and CO_2 was determined with an isothermal-gravimetric method to study the effect ofaluminum-containing additives on the reactivity in air and CO_2 of carbon anode. Results shown that the airburn reactivity at450℃ and carboxy reactivity at 970℃ of carbon anode both decreased with Al-containing additives adding, while showna minimum with the amount of Al_4C_3, AlF_3 and Al_2O_3 increasing. However,all Al-containing additives increase the airburnreactivity at 550℃ of carbon anodes. Coke yield measurement and XRD examination with aluminum containing additivesdoped pitch cokes revealed that the effect of Al-containing additives on the airburn reactivity and carboxy reactivity of car-bon anode would result from chemical factors and str
Airburn reaction and carboxy reaction result in the excess consumption of carbon anode in aluminum electrolysis.To reduce the excess carbon consumption, carbon anode was doped with aluminum-containing additives, such as Al, Al_4C_3, AlF_3 and Al_2O_3. Their reactivity in air and CO_2 was determined with an isothermal-gravimetric method to study the effect ofaluminum-containing additives on the reactivity in air and CO_2 of carbon anode. additives added, while shown as minimum with the amount of Al_4C_3, AlF_3 and Al_2O_3 increasing. However, all Al-containing additives increase the air activity at 550 ° C of carbon anodes. Coke yield measurement and XRD examination with aluminum containing additivedoped pitch cokes revealed that the effect of Al-containing additives on the airburn reactivity and carboxy reactivity of car-bon anode would result from che mical factors and str