Spherical particles are widely used in industry because they improve fluidity, reduce equipment wear during transportation, and improve filling properties. In this study, we attempted to synthesize spherical fine particles by combustion synthesis process using explosives. As a target of combustion synthesis using explosives, A mixture of titanium powder, ammonium perchlorate and polybutadiene was burned to produce titanium oxide particles. After the raw particles are melted by combustion and turned into titanium oxide, they are transported to the gas phase by a large amount of gas generated by the combustion of explosives and spheroidized by surface tension. Since the shapes of these particles were all spherical, the combustion synthesis process using explosives can be expected as a new spherical particle generation process that does not require an external heat source.

Wet granules are used in various areas, owing to their higher compressibility. In this study, finite element method (FEM) simulations of wet granule compression are performed to discuss the influence of binder on the compressibility of wet granules. The Drucker-Prager Cap model was applied to wet granules with parameters obtained from compression and powder shear tests, and the FEM simulation was performed using these parameters. The results showed that the axial stress at the bottom surface and the radial stress of the wall obtained from the FEM simulation were consistent with the experimental values for the bottom and radial (wall) stress of the compression cell in large strain regions. Furthermore, the FEM results for wet granules with different amounts of binder suggested that particles in wet granules with higher amounts of binder adhered each other more strongly, thereby increasing the axial and radial stresses.

The mineral carbonation technology in which carbon dioxide (CO₂) is converted into stable carbonates using alkaline waste and byproduct is one of the carbon recycling technologies and is attracting attention for its early social implementation. In this article, calcium carbonate (CaCO₃) production from concrete sludge, demolished concrete, and fly ash by wet indirect carbonation technologies is introduced. The all investigations introduced are aiming for the development of efficient processes only consume CO₂ for CO₂ conversion in the processes. The mineral carbonation is an important technology for the proper treatment of various types of alkaline waste and byproduct and for establishing Ca/CO₂ circulation.