Conversion of waste incineration fly ash into zeolite A and zeolite P by hydrothermal treatment

Chikashi Tamura, Motohide Matsuda, Michihiro Miyake

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Zeolities A and P were successfully prepared by hydrothermal treatments at 60-120°C in the presence of NaOH solutions from waste incineration fly ash as a starting materials, pretreated with acid in addition to water washing and heating. The pretreatment was an important process to reproducibly convert fly ash into zeolites A and P. The relations between product fiels of zeolites A and P and hydrothermal conditions were examined. Consequently, zeolites A and P were successfully synthesized by treatments with 1.0-2.0 M NaOH solutions at 60°C for 20-48 h and with 0.5-2.0 M solutions at 80-100°C for 20-48 h, as major products, respectively. The treatment led the generation of sodalite with increasing NaOH concentration. The hydrothermal products exhibited removal characteristics for NH4+ ions, and their uptake amounts were found to depend on zeolites A and P yields.

Original languageEnglish
Pages (from-to)205-209
Number of pages5
JournalJournal of the Ceramic Society of Japan
Issue number1326
Publication statusPublished - Feb 2006


  • Hydrothermal synthesis
  • Incineration fly ash
  • Removal characteristics
  • Resource recovery
  • Sodalite
  • Zeolite A
  • Zeolite P

ASJC Scopus subject areas

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


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