Scheelite is the main raw material for tungsten smelting. The general method of smelting scheelite is pure alkali smelting. This method has a large amount of alkali and needs to be decomposed under the conditions of high temperature and high pressure. The pollutant discharge is serious, which is not conducive to the economic development of our country.

The base reserves of wolframite account for 70.4% of the China's tungsten base reserves. In general, the quartz or silicate minerals are more easily selected in the vein rocks. The scheelite calcite and the scheelite fluorite (barite) ores are more difficult to separate because of the floatability of the minerals, there are still a large number of fine particles in the scheelite coarse concentrate. Gangue minerals such as calcite and fluorite are more similar to scheelite than those of collectors, they are difficult to separate.

The balance of aircraft load is the key link to ensure flight safety. Choosing and optimizing the balance device of aircraft's weight can make full use of the aircraft's payload and improve the efficiency of air transportation. High density tungsten alloy is small in size and easy to install and connect.

Heteropoly acid is a kind of acid, which has been acidified, condensed and dehydrated by two or more than two kinds of inorganic oxyacid ions. It is a new type of acid catalyst and oxidation-reduction catalyst, which has been widely studied and developed in recent years.

Tungsten oxide limonite is a multi metal component, containing tungsten oxide 0.3%-0.6%, iron 26%-31% and other elements such as silicon, aluminum and calcium. It is difficult to be separated and enriched by traditional ore dressing method, it can not be enriched in high grade like other tungsten ores. At present, the ore can only be used as the raw material for cement production. A large amount of precious metal tungsten is irreversibly disappearing in building materials.

Pressure leaching and water leaching are two mature methods for industrial leaching of tungsten from tungsten ore. The leachate obtained by the above two leaching methods is a mixed solution of sodium tungstate and sodium carbonate, which usually contains a small amount of impurities such as P, As, Si, etc. and this solution is a soda leaching solution containing a tungsten material.

Tungsten is a very important non-ferrous metal. It has a series of properties such as high density and high strength. It is commonly used in counterweight materials, shielding materials, military firing materials, semiconductor materials, etc.

In ore deposits, tungsten is more or less symbiotic with minerals such as tin, copper, antimony, bismuth or molybdenum. Tungsten ore is separated by gravity concentration method, froth flotation method, or gravity concentration-froth flotation process. However, for the associated tungsten in the complex tin concentrate, it is difficult to separate by using the conventional ore separation methods. When the tin concentrate containing ≥1%, the high melting point of tungsten will affect the smelting of tin concentrate.

Environmental pollution is a major challenge facing by humans today. The use of photocatalytic technology to control environmental problems is one of the most active research fields. Finding high-efficiency photocatalysts is a top priority in this field. Bismuth tungstate (Bi2WO6) photocatalyst is considered to be a potential excellent visible light catalytic material due to its unique electronic structure, excellent visible light absorption capacity and high organic matter degradation ability.

In the association deposit of scheelite and wolframite, the ratio of scheelite to wolframite is 1:9 to 9:1. Although the recovery rate of black and white tungsten mixed flotation has reached more than 80%, the total recovery of tungsten is only about 60%, which is mainly due to the low recovery rate of fine-grained tungsten ore in the separation process of scheelite and wolframite mixed concentrate.