The alkali extraction method is the main method for smelting tungsten concentrate. Due to its strong adaptability to raw materials and high extraction rate, it has become the mainstream process for processing tungsten mineral raw materials. However, in the actual tungsten smelting process, a high tungsten leaching rate is required, and the consumption of NaOH is large. For example, when processing a wolframite concentrate, the NaOH consumption is 1.5 to 2 times the theoretical amount when 99% leaching rate is obtained. When the scheelite concentrate is treated, the NaOH consumption is even 3 to 4 times of the theoretical amount.

The band gap of tungsten bronze (MxWO₃) is about 2.7 eV, and it has free-migrating electrons. It is one of the most suitable materials for transparent and thermal insulation. Research shows that tungsten bronze materials have better transparency and heat insulation than ITO, ATO, AZO and GZO. It is one of the effective means of saving energy for building or automobile glass. It is a kind of high quality filter for infrared light, and it can be coated on the surface of glass or plastic film to form a transparent insulation coating.

Tungsten oxide has the unique physical properties such as photochromism, electrochromism, thermochromism and gas sensitivity. The color changes can be achieved by changing the wavelength, changing the temperature or applying voltage. Therefore, the transition metal tungsten oxide can be used in many fields, such as various sensors, electronic devices, and so on, because of its advantages. The development of Vietnam has become a hot topic all over the world.

In the process of hydrometallurgy of tungsten, sodium tungstate solution is adsorbed by ion exchange resin, and the wastewater is discharged directly. Due to the limitations of the ion exchange process and the complexity of the raw materials, the WO₃ content in the wastewater after ion exchange is always maintained at a certain value, most of which are larger than 0.05g/l. This not only increases the cost of production and consumption of tungsten resources, but also increases the cost of environmental management.