Recovery of calcium from BF slag and synthesis of zeolite a using its residue

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

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12 Citations (Scopus)


The elution and recovery of Ca from blast furnace slag and the alkali hydrothermal synthesis of zeolite A using the residue from the elution treatment were investigated using a ball-milling-type reaction vessel. The superior elution was obtained by using citric and formic acid solutions from which Ca could be selectively eluted from the slag. Whereas hydrochloric acid solution and ion-exchanged water were ineffective for Ca elution. Ca ions eluted in the solution were recovered as calcium formate by evaporation of water. From the formic acid eluted slag residue after three elution treatment cycles of the slag for 7.2 ks, zeolite A was synthesized in 1 mol/L NaOH solution with a reaction time of 86.3 ks at 343 K, without the addition of any other materials.

Original languageEnglish
Pages (from-to)901-905
Number of pages5
JournalISIJ International
Issue number6
Publication statusPublished - 2011 Jun 15


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


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