Osamu Takeda 교수

Recycling of rare earth magnet scrap is required for improving resource conservation. Removal of rare earth oxide from off-specification magnet alloy scrap was investigated by remelting the scrap together with fluoride flux, LiF–50 mol% NdF3 and LiF–25 mol% NdF3–25 mol% DyF3, at 1503 K for the development of novel recycling process. As a result, separation of magnet alloy from fluoride flux after remelting was fine, and neither suspension of alloy in the flux nor suspension of flux in the alloy

The possibility of a high-speed and (semi-)continuous titanium production process by the magnesiothermic reduction of titanium subchloride—titanium dichloride (TiCl2) and/or titanium trichloride (TiCl3)—is discussed. When the TiCl3 feed material and magnesium reductant charged into a titanium reaction container were heated at a rate of 0.056 K/s (3.3 K/min) in an argon atmosphere, the temperature of the container rapidly increased above 973 K, and the magnesiothermic reduction of TiCl3 proceeded

An investigation was carried out to determine the viability of electrowinning lithium from LiOH in molten chloride, with a view to developing a system for the storage and transportation of hydrogen using LiH as the storage medium. It was predicted from the chemical potential diagram for the Li–O–H system that Li metal cannot be electrowon from a LiOH-containing salt, as any Li generated by electrolysis will readily react with LiOH to form Li2O. Electrolysis in molten LiCl–42 mol% KCl or molten L

The development of a new viscometer based on rotating crucible method and the viscosity measurement of SiO2–CaO–CaF2 system were carried out. The viscometer was hermetically closed, and the atmosphere around the melts was highly controllable. In the viscosity measurement, an inner cylinder made of graphite was immersed into the melts in a graphite crucible under Ar at elevated temperatures (1467–1782 K). The torque given to the inner cylinder by rotating the crucible was measured by means of a s