Technological development of tungsten

wallpapers Industry 2021-05-25
Technological development of tungsten
Tungsten was discovered by the Swedish chemist Scheele in 1781. To the early 20th century, due to the development of a series of applications, such as 1900 in Paris World Exposition for the first time to display tungsten as an alloying element of high-speed steel and the use of tungsten filament made of light bulbs; From 1927 to 1928, tungsten carbide-based sintered cemented carbide was developed, and tungsten metallurgy industry began to come into being and develop.
 
In order to meet the customers' increasing demand for the quality of tungsten products, reduce the cost and reduce the pollution to the environment, tungsten metallurgy technology has made great progress, and new advanced technology has completely replaced the traditional technology. It is mainly reflected in the following aspects:
In terms of raw material decomposition of tungsten, the early industrialized soda press-boiling method has developed into an efficient treatment of scheelite concentrate and low-grade scheelite middles, as well as the mixed tungsten and white ore. On the basis of the breakthrough in theoretical research, the NaOH decomposition method has developed from treating low calcium wolframite concentrate to a general technology for treating various tungsten mineral raw materials including scheelite concentrate and refractory tungsten middles. Of course, with the development of the gradual elimination of NaOH melting method, soda sintering method, hydrochloric acid decomposition method and another low efficiency, serious environmental pollution of the traditional methods. At the same time, it reduces the requirement of mineral processing and greatly improves the utilization rate of resources.
 
In the preparation of pure tungsten compounds, the strongly basic anion exchange purification and transformation process of crude Na2WO4 solution, as well as the characteristics of short process, low cost and high product quality, have replaced the classical magnesium salt purification and traditional chemical transformation process to a large extent. Corresponding to this idea, the purification and transformation of the quaternary ammonium salt extraction method has presented a promising prospect from laboratory research and development to industrialization. The selective precipitation method for removing molybdenum, tin, antimony, arsenic from tungstate solution has been successfully developed and widely used, which greatly improves the purity of tungsten products and the adaptability of the tungsten metallurgy process to raw materials.
 

Tag: tungsten