Paper Title:
Mineralizing Spinel Formation with Boron-Containing Compounds
  Abstract

Spinel (MgAl2O4) formation from stoichiometric MgO and Al2O3 is strongly mineralized by B-containing compounds such as boron oxide (B2O3), lithium tetraborate (Li2B4O7) and sodium tetraborate (Na2B4O7) at 1000°C. TEM confirms that the mineralization with each compound involves borate glass which is presumably formed on cooling from liquid at 1000°C. EDS shows the boron-containing liquids formed from B2O3 and Na2B4O7-mineralized samples contain little alumina suggesting a templated grain growth whereas those in Li2B4O7-mineralized samples dissolve sufficient alumina to suggest dissolution-precipitation is occurring at this temperature. XRD shows that Li2B4O7 is the most effective mineralizer producing single- phase spinel with 3 wt% addition at 1000°C whereas B2O3 produces Mg3B2O6 at 1.5 wt% addition and both B2O3 and Na2B4O7- mineralized samples show incomplete spinelisation which may be explained by the composition of the liquids formed with these two mineralizers.

  Info
Periodical
Edited by
P. VINCENZINI
Pages
2254-2259
DOI
10.4028/www.scientific.net/AST.45.2254
Citation
G. Bhattacharya, S. W. Zhang, D. D. Jayaseelan, W. E. Lee, "Mineralizing Spinel Formation with Boron-Containing Compounds", Advances in Science and Technology, Vol. 45, pp. 2254-2259, 2006
Online since
October 2006
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$32.00
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