Chemical recycling of inorganic wastes by using phase separation of glass

Tokuro Nanra, Shuhei Mikami, Takuya Imaoka, Shinichi Sakida, Yoshinari Miura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B2O3 to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO2 phase containing CaO occurred, not obtaining high SiO2 solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.

Original languageEnglish
Pages (from-to)220-223
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number1350
Publication statusPublished - Feb 2008


  • Blast furnace slag
  • Chemicalrecyeling
  • Glass
  • Phase separation
  • Waste recycling

ASJC Scopus subject areas

  • Ceramics and Composites
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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