In order to establish a sustainable society, it is necessary to maintain the supply of materials that act as social infrastructure. Global crude steel production is increasing year by year, and demand for base and rare metals is also increasing. At the same time, degradation and depletion of mineral resources, and production of CO2 and by-products have become problems. It is necessary to establish social sustainability through efficient material process and resource recycling. Based on high-temperature physical chemistry and reaction engineering, our group aim to build the reaction process necessary for sustainable resource supply, reduction and use of by-products.