The preparation of ammonium paratungstate by freeze-drying is one of the methods of industrial production of tungsten products. Ammonium paratungstate freeze-drying method is essentially the principle of ammonium tungstate solution as the freeze-drying method of raw materials, its rapid rapid freezing.

Ammonium paratungstate prepared by the neutralization crystallization method is one of the main methods of industrial production of ammonium paratungstate. Ammonium paratungstate, which is fine in grain size, is a necessary condition for the production of subsequent high-performance tungsten products.

Ammonium paratungstate ultrasonic technology is a technology that works in conjunction with ammonium paratungstate crystals. Ultrasound is a kind of sound wave whose frequency is between 10kHz-10MHz and whose wavelength is in the range of 10cm-0.015cm. Because ultrasonic has beam-like light and similar light propagation characteristics, it is a mechanical vibration wave that easily accumulates energy.

Ammonium paratungstate ultrasonic technology is a technology that works in conjunction with ammonium paratungstate crystals. Ultrasound is a kind of sound wave whose frequency is between 10kHz-10MHz and whose wavelength is in the range of 10cm-0.015cm.

The NaOH decomposition process is currently used by tungsten smelting enterprises in China. During the process of decomposition, impurities such as phosphorus, arsenic, silicon, tin and fluorine will be decomposed into sodium tungstate solution. A large number of impurities will interfere with the subsequent processing, resulting in heavy task of subsequent purification process, resulting in low recovery rate of tungsten and even affecting the quality of subsequent ammonium tungstate and smelting wastewater treatment.

The method for the determination of tungsten trioxide in tungstic acid is mainly based on the weight method of cinchonine. The principle is that the tungstic acid is separated from the impurities by using cinchonine hydrochloride in a hydrothermal solution with pH value of 3.00-4.4, And then burning it to get the product of tungsten trioxide, the final weighing, colorimetric to determine the content of tungsten trioxide.