Tungsten and molybdenum have the same atomic radius and similar electronic structure, showing very similar chemical properties. Therefore, tungsten and molybdenum are often found in scheelite in nature. Tungsten and molybdenum separation is a technical problem in tungsten smelting process.

Tungsten and molybdenum are often co born in scheelite in nature. At present, China's high molybdenum resources account for about 50% of the total industrial reserves of tungsten, and the tungsten resources of molybdenum resources account for about 1/3. This kind of ore is difficult to choose. It is a major problem that troubles the tungsten smelting industry.

China is the world's largest tungsten producing country and the main producer of tin, millions of tons of tungsten tin symbiotic minerals are separated and enriched by the methods of general gravity separation and flotation or magnetic separation.

Tungsten slag is a waste residue produced by tungsten smelting enterprises in the process of pressure leaching. The pressure leaching process is based on a standard tungsten ore with a content of 65% of tungsten ore after ore dressing and adding additives. Under high temperature and high pressure alkaline conditions, after wet decomposition or fire decomposition, tungsten primary products such as sodium tungstate, calcium tungstate and ammonium para tungstate are obtained and the fineness is more than 100 orders of tungsten residue, each of which is produced. The output of a ton of WO₃ primary products and the discharge of about 0.8 tons of tungsten slag at the same time, with the exhaustion of resources, the recovery of tungsten slag is of great significance.

In order to solve the problem of tungsten and molybdenum separation, some scholars have provided a complex amine hydroxamic extractant extraction method for tungsten molybdenum separation in tungsten molybdate solution, to solve the problem of deep separation of tungsten molybdenum with tungstate solution, to prepare a high purity sodium molybdate solution. The purpose of this study is to remove the tungsten in molybdate solution by using solvent extraction, such as hydrogen peroxide oxidation, vulcanizing agent vulcanization and EDTA complexation without adding other steps to prepare high purity molybdate.

In the existing technology, high alkali pressure cooking technology is commonly used in the smelting of scheelite concentrate and middle ore, and the amount of alkali is generally 2.8 ~ 4 times of the theoretical amount. The mass ratio of excess NaOH and WO₃ in the crude sodium tungstate solution after the alkali pressing filter is 0.7 ~ 1.2. If it is not recycled, it has a negative effect on the subsequent process.

After a long time of mining, the quality of China's tungsten and molybdenum have been exhausted, and the effective separation of high requirements on the treatment process, if the preparation of high value-added utilization of low-grade refractory molybdenum mixed concentrate directly of high purity tungsten and molybdenum alloy products, simplify the process, but also can realize the efficient use of difficult to use tungsten and molybdenum resources.

Pure tungsten material not only has the common properties of general metals, such as conductivity, thermal conductivity, plasticity and metallic luster, but also has high density, high melting point, high thermal conductivity, low vapor pressure, low thermal expansion coefficient, strong absorption ray ability and sputtering threshold, good corrosion resistance and so on. Therefore, the ITER nuclear polymerization is very good. For variable device parts, it is an important material for plasma first wall protective coating.

The existing technology of non-standard materials with low tungsten content is treated by traditional reverberatory furnace or rotary kiln sodium roasting. But roasting has the disadvantages of large consumption of roasting agent, low degree of automation, high energy consumption, low efficiency, high cost, large dust, low recovery rate and great influence on the environment. In the increasingly stringent environmental protection requirements, the development of tungsten iron ore seems to have no future.

Tungsten tube is a kind of product of many tungsten products. At present, the methods of making tungsten tubes are mostly made of powder metallurgy or chemical vapor deposition. The tungsten tubes obtained by powder metallurgy are easy to crack and have high brittleness when they are installed and used at room temperature. While the chemical vapor deposition process needs to use or produce harmful gas in the process of production, and the environmental protection performance is low.