Conversion of waste incineration fly ash into Al-substituted tobermorite by hydrothermal treatment

Chikashi Tamura, Zhidong Yao, Fumio Kusano, Motohide Matsuda, Michihiro Miyake

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Al-substituted tobermorite has been successfully synthesized by hydrothermal treatment at 180°C in the presence of NaOH solution, using waste incineration fly ash as a starting material, pretreated with repeatedly washing and heating at 800°C. The relation between Al-substituted tobermorite yield and synthetic conditions has been also examined. The pretreatment was essential to convert fly ash into Al-substituted tobermorite with reproducibility, and the Al-substituted tobermorite yield was found to reach a maximum in the fly ash treated with 2 M (mol·dm-3) NaOH for 20-30 h. The order of Al-substituted tobermorite yield was 2 M≫3.5 M≅1 M>0.5 M≫6 M, with respect to NaOH concentration. With increasing the NaOH concentration and extending the reaction time, sodalite and cancrinite generated as minor phases. The fly ash treated with 2 M NaOH for 30 h showed the best removal characteristics and took up about 0.5 mmol·g-1 for both Cs+ and NH4+ ions. The uptake amounts of resulting products were found to depend on the Al-substituted tobermorite yield.

Original languageEnglish
Pages (from-to)150-155
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume108
Issue number2
DOIs
Publication statusPublished - 2000

Keywords

  • Al-substituted tobermorite
  • Cancrinite
  • Hydrothermal synthesis
  • Incineration fly ash
  • Removal characteristics
  • Resource recovery
  • Sodalite

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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