Fluoride Desorption of Secondary Alumina at High Temperatures

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  • YANG Youjian
    School of Materials & Metallurgy, Northeastern University
  • GAO Bingliang
    School of Materials & Metallurgy, Northeastern University
  • YU Jiangyu
    School of Materials & Metallurgy, Northeastern University
  • WANG Zhaowen
    School of Materials & Metallurgy, Northeastern University
  • SHI Zhongning
    School of Materials & Metallurgy, Northeastern University
  • HU Xianwei
    School of Materials & Metallurgy, Northeastern University

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Primary alumina is used as the raw material as well as the sorbent for fluoride in aluminum electrolysis. Secondary alumina is the product of primary alumina after absorbing fluoride in exhaust pot gas. The fluorine and mass loss during heating secondary alumina was measured to study the fluoride desorption process of alumina. It was found that during the heating of secondary alumina, HF emission was always combined with H2O escape at approximately 740°C or below. 47% fluorine in secondary alumina desorbed in the form of HF at 30–740°C, while the rest 53% desorbed in the form of chiolite at 740–1100°C.

収録刊行物

  • Electrochemistry

    Electrochemistry 81 (7), 535-537, 2013

    公益社団法人　電気化学会

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