Chlorination of bauxite in salt bath as a reaction medium

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  • NANJO Michio
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • KANAI Toshiharu
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • ITO Yoshimasa
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • TANIUCHI Kentaro
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University

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Other Title
  • 塩浴を反応媒体とするボーキサイトの塩化
  • エンヨク オ ハンノウ バイタイ ト スル ボーキサイト ノ エンカ

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Abstract

Bauxite was chlorinated in molten salts using chlorine gas and carbon to produce Alcoa Electrolyte such as AlCl3-NaCl-KCl melt. Chlorine gas was mildly introduced at 820°C into the suspension of bauxite and carbon powder in NaCl-KCl eutectics. AlCl3-FeCl3-NaCl-KCl melts are obtained without significant loss of AlCl3, carbon and chlorine gas. Hematite in bauxite dissolves in molten NaCl-KCl salt. Chlorination of alumina is enhanced by ferric chloride. Selective chlorination of bauxite is performed with hydrogen chloride gas and carbon in NaCl-KCl salt bath to give FeCl2 not FeCl3. The selective chlorination to remove hematite as FeCl3 is also achieved when a large amount of bauxite is introduced in a small amount of molten salt.

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