Vaporization behaviors of Zn in FetO-CaO-SiO2-Al2O3 slag system

Yan Ling Zhang, Shi Qi Li, Eiki Kasai, Jun Ping Lu, Xiao Dong Guo

Research output: Contribution to journalArticlepeer-review

Abstract

Vaporization behavior of zinc in the slag system FetO-CaO-SiO2-Al2O3 was examined, including the formation ratio of vapor species and their partitioning as well as the effect of process factors such as temperature, holding time, slag composition, and addition of reductive agents. A thermodynamic estimation with the principle of Gibbs free energy minimization shows that the major vapor species from the sample of FeO-CaO-SiO2-Al2O3 system + ZnO + CaCl2 are metallic Zn, ZnCl2 and FeCl2 in the experimental temperature range. The results suggest that the formation ratio of metallic Zn and FeCl2 increases with temperature increasing, while that of ZnCl2 decreases. The evaporation of sample is initially fast and becomes steady after holding for 10 min. Gaseous ZnCl2 is mainly formed during heating period, at the holding stage it reacts with FeO to produce gaseous FeCl2. With regard to slag compositions, FeO and basicity significantly affect the evaporation of zinc. The evaporation ratio of zinc can be enhanced by the addition of reductants such as carbon powder.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalZhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume18
Issue number1
Publication statusPublished - 2008 Jan 1

Keywords

  • FeO-CaO-SiO-AlO slag system
  • Vaporization behaviors
  • Zinc

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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