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Russian Metallurgy (Metally)

, Volume 2015, Issue 9, pp 719–725 | Cite as

Specific features of the initial stages of the aluminothermic reduction of zirconium from ZrO2

  • V. M. ChumarevEmail author
  • A. N. Mansurova
  • R. I. Gulyaeva
  • M. V. Trubachev
  • A. V. Larionov
Article
  • 35 Downloads

Abstract

The phase composition of the products of the low-temperature stage of the reaction of ZrO2 with aluminum is studied. The influence of charge compacting and particle size of the reagents is revealed. The onset temperatures for the reaction of zirconium oxide (TsrO-1 and TsrO-S trade marks) and aluminum (APZh and PA-4 trade marks) are determined by differential scanning calorimetry. A high dispersity of ZrO2 and the presence of zircon ZrSiO4 in zirconium oxide (TsrO-S) are found to provide a decrease in the onset temperatures for the reaction. Intermetallic compound ZrAl3 is predominantly formed at the low-temperature stage of the reaction of ZrO2 with aluminum. Zirconium is reduced from ZrO2 by aluminum stage by stage through the formation of lower oxides ZrO and Zr3O. Suboxide AlO is detected in the products of reaction of ZrO2 with aluminum. The heat flow rates are estimated, according to which the reduction of zirconium from ZrO2 by aluminum is formally characterized by the first order, and the activation energy is E = 160–170 kJ/mol.

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • V. M. Chumarev
    • 1
    Email author
  • A. N. Mansurova
    • 1
  • R. I. Gulyaeva
    • 1
  • M. V. Trubachev
    • 1
  • A. V. Larionov
    • 1
  1. 1.Institute of Metallurgy, Ural BranchRussian Academy of SciencesYekaterinburgRussia

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