Formation of CaCl 2 and CaF 2 from CaSO 4 and plastics containing halogen element

Shigeru Ueda*, Yuuki Hatakeyama, Koji Uotani, Katsunori Yamaguchi, Takahiro Okura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Waste gypsum from construction materials have to be recycled legally in Japan. Combustion of plastics containing halogen may generate halide gas. Stabilization treatment of halogen element should be done. In the present study, the reaction between the plastics and gypsum generating calcium halide such as CaCl 2 or CaF 2 had been investigated. Reaction condition was evaluated thermodynamically, and experiment for generating CaCl 2 and CaF 2was conducted. CaCl 2 was formed from CaSO 4 and chloroethylene at 1273K. CaF 2 was formed over 1173K. Crystal water of CaSO 4 accelerates the reaction forming CaF 2.

Original languageEnglish
Pages (from-to)387-392
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number5
Publication statusPublished - 2009 May
Externally publishedYes


  • CaCl
  • CaF
  • CaSO
  • Gypsum
  • Waste plastics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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