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<p>Continuous anodes (self-baked anodes) can reduce energy consumption in aluminum electrolysis, but continuous anode electrolytic cells generate substantial asphalt fume pollution, posing serious threats to the environment and human health. To develop an efficient and feasible fume purification method, this paper proposes using dry adsorption technology with industrial-grade alumina as an adsorbent to treat asphalt fumes. The physical structure of industrial-grade alumina was characterized via BET and SEM–EDS analysis, revealing a large specific surface area and well-developed pore structure. This demonstrates some adsorption potential and the feasibility of subsequent thermal reconditioning for its reuse as a raw material. Further investigations into the effects of adsorption time and temperature on purification efficiency showed that longer adsorption times and lower temperatures enhance the adsorption rate of harmful substances in the fumes. Experiments revealed that when adsorption temperature increased from 20 to 100&#xa0;°C, the adsorption rate decreased from 97.1 to 81.3%; conversely, when adsorption time extended from 5 to 120&#xa0;min, the adsorption rate rose from 74.5 to 97.1%. The specific surface area of metallurgical-grade alumina decreased from 93.99 to 45.73 m<sup>2</sup>/g before and after adsorption. The adsorption behavior of asphalt fumes onto alumina suggests a process dominated by physical interactions, and the adsorption purification process better conforms to the pseudo-first-order kinetic model. After adsorption, the alumina can be reused as raw material for electrolytic aluminum production following high-temperature calcination treatment. This study validates the effective adsorption capacity of metallurgical-grade alumina for asphalt fumes, providing new insights and application references for the treatment of electrolytic aluminum fumes, while the detailed quantification of secondary gaseous emissions during calcination will be addressed in future optimization phases.</p> Graphical Abstract <p></p>

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Dry Adsorptive Purification of Asphalt Fumes Using Metallurgical-Grade Alumina

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Jiahao Zheng,
  • Yonghui Yang,
  • Wanzhang Yang,
  • Wenhui Ma,
  • Hengwei Yan,
  • Zhanwei Liu,
  • Mingyi Hu,
  • Qibing Gu

摘要

Continuous anodes (self-baked anodes) can reduce energy consumption in aluminum electrolysis, but continuous anode electrolytic cells generate substantial asphalt fume pollution, posing serious threats to the environment and human health. To develop an efficient and feasible fume purification method, this paper proposes using dry adsorption technology with industrial-grade alumina as an adsorbent to treat asphalt fumes. The physical structure of industrial-grade alumina was characterized via BET and SEM–EDS analysis, revealing a large specific surface area and well-developed pore structure. This demonstrates some adsorption potential and the feasibility of subsequent thermal reconditioning for its reuse as a raw material. Further investigations into the effects of adsorption time and temperature on purification efficiency showed that longer adsorption times and lower temperatures enhance the adsorption rate of harmful substances in the fumes. Experiments revealed that when adsorption temperature increased from 20 to 100 °C, the adsorption rate decreased from 97.1 to 81.3%; conversely, when adsorption time extended from 5 to 120 min, the adsorption rate rose from 74.5 to 97.1%. The specific surface area of metallurgical-grade alumina decreased from 93.99 to 45.73 m2/g before and after adsorption. The adsorption behavior of asphalt fumes onto alumina suggests a process dominated by physical interactions, and the adsorption purification process better conforms to the pseudo-first-order kinetic model. After adsorption, the alumina can be reused as raw material for electrolytic aluminum production following high-temperature calcination treatment. This study validates the effective adsorption capacity of metallurgical-grade alumina for asphalt fumes, providing new insights and application references for the treatment of electrolytic aluminum fumes, while the detailed quantification of secondary gaseous emissions during calcination will be addressed in future optimization phases.

Graphical Abstract