Tungsten is one of the most important high-tech metals, and its high-purity products are vital for developing advanced materials. Wolframite and scheelite have been used as main resources for tungsten extraction. However, the high-quality wolframite and scheelite resources reduced with the continuously exploitation and utilization and the tungsten deposits with high content of impurities must be exploited. As one of the main impurities, phosphorus significantly affects the quality of the ammonium paratungstate (APT) products. In order to obtain qualified APT, the phosphorus impurity contained in tungsten deposits must be removed in the process of tungsten hydrometallurgy.

The global energy demand has increased due to rapid population growth. The depletion of energy sources and increase in energy demand have urged researchers worldwide to study the electrochemical energy storages system, such as batteries, conventional dielectric capacitors, and fuel cells. Supercapacitors are one of the electrochemical capacitors that have attracted much research interest because of their long cycle life, high power density, excellent reversibility, environment friendly and higher safety.

As one of the most promising candidates for plasma-facing material (PFM) in future fusion reactors, tungsten was extensively investigated in recent years. However, even though tungsten has many advantages like high melting point, high thermal conductivity, low tritium inventory and low erosion rate under plasma loading, there still exist some disadvantages such as high ductile–brittle transition temperature (DBTT), low recrystallization temperature (RCT), irradiation induced hardening, and so on.