Calcination of gibbsite: M38-8/116E-PDF

"Data are presented showing the changes in physical properties which occur during the calcination of Bayer-process gibbsite at temperatures up to 1400°C. The various stages of the calcination were examined using differential thermal analysis, X-ray diffraction, low-temperature nitrogen adsorption, optical and electron microscopy, and particle-size distribution analyses. The morphology of the gibbsite aggregates was found to be unchanged up to ~ 1100°C, despite the development of several intermediate metastable phases. At higher temperatures, the original gibbsite pseudomorphs become microporous coincident with the development of finely divided alpha-alumina which is formed in a strain-free state. The crystal size and pore size increase with temperature between 1100 and 1400°C. The influence of the parent gibbsite structure on the morphology of the alpha-phase material is demonstrated in scanning-electron micrographs. The effect of various parameters on the milling of high-temperature calcines is also discussed"--Abstract, p. 43.

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Department/Agency Natural Resources Canada. Dept. of Energy, Mines and Resources. Mines Branch.
Title Calcination of gibbsite
Series Title Reprint series ;
Publication Type Series - View Master Record
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "Reprinted from the Journal of the Canadian Ceramics Society, (1971), vol. 40, pp. 43-48." Historical publication digitized from print 2017 [by Natural Resources Canada].
Date 1972.
Number of Pages p. 43-48 :
Catalogue Number
  • M38-8/116E-PDF
Departmental Catalogue Number 300195
Subject Terms Ceramics, Minerals, Processing