Effective Utilization of Grinding and Mechanochemistry to Recycling and Separation

Kibu Chiyo, Junya Kano, Fumio Saito

Research output: Contribution to journalArticlepeer-review


The authors introduce novel research results on material synthesis and recycling by grinding. The research is focused at first mechanical activation of fine particles of solid material caused by grinding, and this leads to synthesize functional material from two starting materials without heating. One of the examples is to show the formation of complex oxides such as CaTiO3 from CaO and TiO2. Another one is dechlorination of PVC by its grinding with CaO to form CaOHCl and hydrocarbon. This means that it is possible to separate chlorine from PVC by its washing with water. Grinding operation enables us to reduce indium (In) by from indium oxide (In2O3) and ITO in the presence of Li3N under NH3/N2 gaseous environment. The reaction can be given by: In2O3 + Li3N + NH3→2In + 3LiOH + N2. The purity of In and its recover are quite high over 90%. Further example of the mechanical activation followed by heating up to about 400°C is to generate hydrogen (H2) from biomass such as wood and straw. The biomass is milled with inorganic substance such as CaO, followed by heating at non-oxidative environment. The generation of H2 in high concentration can be attained during heating, due to adsorption of CO2 and CO by CaO to form CaCO3. This implies that the grinding plays a big role to bring out many possible applications for material synthesis, material and waste processing.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalResources Processing
Issue number1
Publication statusPublished - 2013


  • Energy recovery
  • Material synthesis
  • Mechanochemistry
  • Separation
  • Waste processing

ASJC Scopus subject areas

  • Environmental Chemistry
  • Soil Science
  • Pollution
  • Nature and Landscape Conservation


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