Vaporization of zinc during thermal treatment of ZnO with tetrabromobisphenol A (TBBPA)

Mariusz Grzegorz Grabda, Sylwia Oleszek-Kudlak, Etsuro Shibata, Takashi Nakamura

研究成果: Article査読

24 被引用数 (Scopus)

抄録

In the present work we investigate the vaporization of zinc or its compounds during thermal treatment of ZnO with tetrabromobisphenol A. Samples of 2g of ZnO:TBBPA (3.34:1) were isothermally heated in a laboratory-scale furnace at temperatures from 490°C to 950°C, and the solid, condensed and gaseous products formed were analyzed by X-ray diffraction analysis, electron probe microanalysis, inductively coupled plasma analysis, ion chromatography, and gas chromatography coupled with mass spectrometry. The results obtained indicate that the vaporization of ZnBr2 formed strongly depends on heating time and temperature, yet is restrained by char, if formed with sufficient yield (above 15wt%). Starting from 850°C, this char commences carbothermic reduction of any remaining ZnO, which from then begins to evaporate as zinc metal vapor. Volatilization of zinc is completed at 950°C. The presence of 5vol.% of oxygen has no significant effect on the vaporization of formed ZnBr2, the carbothermic reduction or the volatilization of metallic zinc. Strongly oxidizing conditions (20vol.% of oxygen), however, boost the oxidation of char and thus the vaporization of ZnBr2, but prevent carbothermic reduction of any un-reacted ZnO by depleting this char.

本文言語English
ページ(範囲)473-479
ページ数7
ジャーナルJournal of Hazardous Materials
187
1-3
DOI
出版ステータスPublished - 2011 3 15
外部発表はい

ASJC Scopus subject areas

  • 環境工学
  • 環境化学
  • 廃棄物管理と処理
  • 汚染
  • 健康、毒物学および変異誘発

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