Effect of aluminum-containing additives on the reactivity in air and CO2 of carbon anode for aluminu

• 作 者: Lai Yanqing LI Jie LI Qingyu Ding Fengqi
• 机 构: School of Metallurgy Science and Engineering, Central South University, Changsha 410083, China
• 出 处: 稀有金属(英文版)
• 发表日期: 2004年2期
• 关键词: aluminum electrolysis aluminum-containing additives reactivity carbon anode

Airbum 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, Al4C3,AlF3 and Al2O3. Their reactivity in air and CO2 was determined with an isothermal-gravimetric method to study the effect of aluminum-containing additives on the reactivity in air and CO2 of carbon anode. Results shown that the airb reactivity at 450℃ and carboxy reactivity at 970 ℃ of carbon anode both decreased with Al-containing additives adding, while shown a minimutn with the amount of Al4C3, AlF3 and Al2O3 increasing. However, all Al-containing additives increase the airbum reactivity at 550℃ of carbon anodes. Coke yield measurement and XRD examination with aluminum containing additives doped pitch cokes revealed that the effect of Al-containing additives on the airbum reactivity and carboxy reactivity of carbon anode would result from chemical factors and structural factors.