According to China Tungsten Online, data from the United States Geological Survey showed that as of the end of 2024, the global molybdenum reserves were about 15,000 kilotons, the same as the previous year; and China's molybdenum reserves were the highest, at 5,900 kilotons, accounting for 39.33% of the global total reserves.

The chemical formula of purple tungsten oxide is WO2.72. It is named for its dark purple powder appearance. Its crystal form is rod-shaped or needle-shaped, and the particle distribution is relatively loose. It is mainly used to prepare ultrafine tungsten powder and ultrafine tungsten carbide powder.

According to China Tungsten Online, data from the United States Geological Survey show that by the end of 2024, global tungsten reserves were about 4.6 million tons, up about 4.55% year-on-year; among them, China had the highest tungsten reserves, at 2.4 million tons, accounting for 52.17% of the world's total reserves, up about 4% from the end of 2023. Vietnam's tungsten reserves increased most significantly, increasing by nearly 90% to 140,000 tons.

High-purity ammonium paratungstate is abbreviated as APT. It is the raw material for preparing high-purity tungsten oxide and high-purity tungsten powder. It can be prepared by thermal dissociation and ammonia dissolution. Under high temperature conditions, ammonium paratungstate decomposes to obtain a hydrous tungsten oxide compound that is easily soluble in ammonia water, which is dissolved in ammonia water to obtain an ammonium tungstate solution. After filtering out the insoluble matter, the solution is evaporated and crystallized to obtain high-purity ammonium paratungstate.