Chemical recycling of municipal waste slag by using phase separation

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8 Citations (Scopus)


A chemical recycling method by using phase separation was applied to municipal waste slags. Glasses were prepared from incineration ash and ash-melted slag, where B2O3 was added to promote phase separation. The glasses were heat-treated at temperatures higher than their glass transition temperatures, and they were soaked in hydrochloric acid, leaching CaO, Fe2O3, K2O, and S. Transparent and colorless solids containing ca. 80 mass% of SiO2 were successfully obtained as residues. It was suggested that phase separation took place not in the heat-treatment but in the vitrification process, and further characterizations are however required to investigate the phenomena at microscopic levels in the recycling processes.

Original languageEnglish
Pages (from-to)1195-1198
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number1371
Publication statusPublished - Nov 2009


  • Chemical recycling
  • Glass
  • Municipal waste slag
  • Phase separation
  • Waste recycling

ASJC Scopus subject areas

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


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