Research and Development

Development of highly efficient tungsten recycling technology

Oxidizing roasting of solid scraps used to be inefficient and required a large amount of energy. Now highly efficient and energy saving melting has become possible by fused salt melting of NaNO3. Since powder scraps can also be melted to molten products, both solid and powder scraps can be processed simultaneously.
By removing impurities at the same time as efficiently converting Na2WO4 to (NH4)2WO4 by ion exchange, the process can be shortened and the amount of chemicals to use can be reduced significantly. As NH3 is recovered and reused, the environmental impact can be reduced.

Process (Schematic)

Low energy consumption, small environmental impact and high efficiency contribute to low cost processing even in a small amount.