Mechanical Activation of Gibbsite and Boehmite: New Findings and their Implications

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• 作者：S. P. Mehrotra ; T. C. Alex ; G. Greifzu…
• 关键词：Mechanical activation ; Physicochemical changes ; Reactivity ; Gibbsite ; Boehmite ; Bayer process
• 刊名：Transactions of the Indian Institute of Metals
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：69
• 期：1
• 页码：51-59
• 全文大小：756 KB
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• 作者单位：S. P. Mehrotra (1)
  T. C. Alex (2)
  G. Greifzu (3)
  Rakesh Kumar (2)
  
  1. Indian Institute of Technology Gandhinagar, Ahmedabad, 382424, India
  2. CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India
  3. TU Bergakademie Freiberg, Freiberg, Germany
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Materials Science, general
  Tribology, Corrosion and Coatings
  
• 出版者：Springer India
• ISSN：0975-1645

文摘

Almost the entire metallurgical grade alumina is produced from bauxite using the Bayer process. The leaching conditions in Bayer process depend on various Al-oxyhydroxide minerals/phases present in the bauxite. Among the various bauxite types, gibbsitic (trihydrate) bauxite is easiest to digest. Monohydrate (boehmitic and diasporic) bauxites need more stringent digestion conditions in terms of temperature, pressure and alkali concentration. Mechanical activation during milling, especially high energy milling, results in enhanced reactivity of solids due to physicochemical changes induced by milling. This paper is an overview of our recent research on mechanical activation of bauxite and its constituent phases, gibbsite and boehmite. This paper focuses on the leaching of mechanically activated bauxite ores. Complementary results on mechanical activation of gibbsite and boehmite phases are included for a deeper understanding of mechanical activation of bauxite. Implications of these results are highlighted in the context of the Bayer process.