Tungsten electrode material is one of the key materials in argon arc welding technology. Cerium tungsten electrodes have been developed to replace radioactive thorium tungsten electrodes in the field of TIG and PLASMA technology.

Before crystallization of ammonium para tungstate (APT), it is necessary to further remove molybdenum from the crystallization process of APT to obtain a more pure APT crystal product. The impurity removal rate in the crystallization process is directly related to the crystallization rate of APT. With the increase of the crystallization rate of APT, the precipitation rate of impurity increases rapidly. For the same concentration solution, when the crystallization rate of tungsten is increased from 60% to 80%, the crystallization rate of molybdenum will be increased by nearly 3 times. It is difficult to break through 80% of the crystallization rate.

Due to the increasing shortage of tungsten resources and more and more high impurities and low grade ores entering the tungsten smelting process, the content of impurities such as silicon, phosphorus, arsenic and tin in the sodium tungstate solution obtained by tungsten is becoming higher and higher. In order to produce tungsten products such as high purity ammonium para tungstate (APT) and tungsten oxide, sodium tungstate solution must be clean.

As a solid waste, wolframite residue needs financial and material resources for harmless disposal.