Sublimation Kinetics of Zirconium Tetrachloride (ZrCl4) for Producing Zr Sponge

Jae Hong Shin, Mi Sun Choi, Dong Joon Min, Joo Hyun Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Sublimation of ZrCl4 is important for the production of nuclear grade metallic Zr in Kroll's process. The sublimation kinetics of ZrCl 4 was investigated by TGA under both isothermal and non-isothermal conditions. The sublimation rate of ZrCl4 increased with increasing temperature under isothermal conditions. ZrCl4 sublimation was confirmed to be a zero-order process under isothermal conditions, whereas it was first-order kinetics under non-isothermal conditions. The activation energy of ZrCl4 sublimation under isothermal conditions was 21.7 kJ/mol. The activation energy for non-isothermal sublimation was 101.4 kJ/mol and 108.1 kJ/mol with the Kissinger method and Flynn-Wall-Ozawa method, respectively. These non-isothermal activation energies were very close to the heat of sublimation (103.3 kJ/mol). Sublimation occurs by two elementary steps: surface reaction and desorption. Therefore, the overall activation energy of ZrCl 4 sublimation is 104.8(±3.4) kJ/mol. The activation energy of the surface reaction and desorption steps are proposed to be 83.1 kJ/mol and 21.7 kJ/mol, respectively.

Original languageEnglish
Title of host publicationRare Metal Technology 2014 - Held During TMS 2014 143rd Annual Meeting and Exhibition
PublisherMinerals, Metals and Materials Society
Number of pages8
ISBN (Print)9781118888827
Publication statusPublished - 2014
EventRare Metal Technology 2014 - TMS 2014 143rd Annual Meeting and Exhibition - San Diego, CA, United States
Duration: 2014 Feb 162014 Feb 20

Publication series

NameTMS Annual Meeting


OtherRare Metal Technology 2014 - TMS 2014 143rd Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Diego, CA

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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