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<p>This study aims to synergistically address two critical challenges in the electrolytic aluminum industry: greenhouse gas emission reduction and solid waste (red mud) disposal. It utilizes red mud, a highly alkaline by-product of alumina production, to directly capture CO<sub>2</sub> from electrolytic aluminum flue gas, thereby achieving dealkalization. Systematic investigation of the effects of various reaction parameters on pH, electrical conductivity, and the dealkalization rate revealed that rapid neutralization of the red mud slurry to near-neutrality (pH = 6.3) and a dealkalization rate of 11.98% can be achieved under the experimental conditions (20 °C, solid-to-liquid ratio of 1:9, stirring speed of 400 r/min, gas flow rate of 20 mL/min). The reaction pathway of red mud carbonation dealkalization and the mechanism suppressing pH recovery were elucidated. This work provides the aluminum industry with an integrated “Waste Treating Waste” technological route combining carbon capture and solid waste resource utilization.</p> Graphical Abstract <p></p>

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Carbonation-Driven Dealkalization of Red Mud with Concurrent CO2 Capture from Industrial Emissions

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Qibing Gu,
  • Zhanwei Liu,
  • Wanzhang Yang,
  • Wenhui Ma,
  • Hengwei Yan,
  • Jiaping Zhao,
  • Jiahao Zheng

摘要

This study aims to synergistically address two critical challenges in the electrolytic aluminum industry: greenhouse gas emission reduction and solid waste (red mud) disposal. It utilizes red mud, a highly alkaline by-product of alumina production, to directly capture CO2 from electrolytic aluminum flue gas, thereby achieving dealkalization. Systematic investigation of the effects of various reaction parameters on pH, electrical conductivity, and the dealkalization rate revealed that rapid neutralization of the red mud slurry to near-neutrality (pH = 6.3) and a dealkalization rate of 11.98% can be achieved under the experimental conditions (20 °C, solid-to-liquid ratio of 1:9, stirring speed of 400 r/min, gas flow rate of 20 mL/min). The reaction pathway of red mud carbonation dealkalization and the mechanism suppressing pH recovery were elucidated. This work provides the aluminum industry with an integrated “Waste Treating Waste” technological route combining carbon capture and solid waste resource utilization.

Graphical Abstract