Alkali hydrothermal synthesis of zeolite a using oxide by-products

Taichi Murakami, Yoshiyuki Sugano, Tsunetoshi Kinami, Takayuki Narushima, Yasutaka Iguchi, Chiaki Ouchi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The alkali hydrothermal synthesis of zeolite A using oxide by-products such as blast furnace (BF) slag and aluminum dross was investigated. Na-P1 (Na 6Al6Si6O32.12H2O) was synthesized directly in NaOH aqueous solution for 86.4 ks at 373 K using BF slag, Al2O3, and SiO2. On the other hand, zeolite A was successfully synthesized by a two-step method including an elution treatment of Al2O3. Under optimal conditions, the formation ratio of zeolite A in various compounds contained in the product was 56%. The utilization of dross residue squeezed out from the aluminum dross as a raw material to synthesis of zeolite A let this ratio increase to 60%. The heat of water adsorption of the product synthesized by the two-step method using BF slag, SiO2, and aluminum dross residue was measured, and it was 184 J/g, being higher than that of commercial zeolite A.

Original languageEnglish
Pages (from-to)158-165
Number of pages8
JournalISIJ International
Issue number1
Publication statusPublished - 2011


  • Heat-storage materials
  • Hydrothermal synthesis
  • Slag
  • Zeolite A


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